1
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Bak DW, Weerapana E. Proteomic strategies to interrogate the Fe-S proteome. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024; 1871:119791. [PMID: 38925478 PMCID: PMC11365765 DOI: 10.1016/j.bbamcr.2024.119791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 05/23/2024] [Accepted: 06/19/2024] [Indexed: 06/28/2024]
Abstract
Iron‑sulfur (Fe-S) clusters, inorganic cofactors composed of iron and sulfide, participate in numerous essential redox, non-redox, structural, and regulatory biological processes within the cell. Though structurally and functionally diverse, the list of all proteins in an organism capable of binding one or more Fe-S clusters is referred to as its Fe-S proteome. Importantly, the Fe-S proteome is highly dynamic, with continuous cluster synthesis and delivery by complex Fe-S cluster biogenesis pathways. This cluster delivery is balanced out by processes that can result in loss of Fe-S cluster binding, such as redox state changes, iron availability, and oxygen sensitivity. Despite continued expansion of the Fe-S protein catalogue, it remains a challenge to reliably identify novel Fe-S proteins. As such, high-throughput techniques that can report on native Fe-S cluster binding are required to both identify new Fe-S proteins, as well as characterize the in vivo dynamics of Fe-S cluster binding. Due to the recent rapid growth in mass spectrometry, proteomics, and chemical biology, there has been a host of techniques developed that are applicable to the study of native Fe-S proteins. This review will detail both the current understanding of the Fe-S proteome and Fe-S cluster biology as well as describing state-of-the-art proteomic strategies for the study of Fe-S clusters within the context of a native proteome.
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Affiliation(s)
- Daniel W Bak
- Department of Chemistry, Boston College, Chestnut Hill, MA, United States of America.
| | - Eranthie Weerapana
- Department of Chemistry, Boston College, Chestnut Hill, MA, United States of America.
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2
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Engeholm M, Roske JJ, Oberbeckmann E, Dienemann C, Lidschreiber M, Cramer P, Farnung L. Resolution of transcription-induced hexasome-nucleosome complexes by Chd1 and FACT. Mol Cell 2024; 84:3423-3437.e8. [PMID: 39270644 PMCID: PMC11441371 DOI: 10.1016/j.molcel.2024.08.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 06/07/2024] [Accepted: 08/20/2024] [Indexed: 09/15/2024]
Abstract
To maintain the nucleosome organization of transcribed genes, ATP-dependent chromatin remodelers collaborate with histone chaperones. Here, we show that at the 5' ends of yeast genes, RNA polymerase II (RNAPII) generates hexasomes that occur directly adjacent to nucleosomes. The resulting hexasome-nucleosome complexes are then resolved by Chd1. We present two cryoelectron microscopy (cryo-EM) structures of Chd1 bound to a hexasome-nucleosome complex before and after restoration of the missing inner H2A/H2B dimer by FACT. Chd1 uniquely interacts with the complex, positioning its ATPase domain to shift the hexasome away from the nucleosome. In the absence of the inner H2A/H2B dimer, its DNA-binding domain (DBD) packs against the ATPase domain, suggesting an inhibited state. Restoration of the dimer by FACT triggers a rearrangement that displaces the DBD and stimulates Chd1 remodeling. Our results demonstrate how chromatin remodelers interact with a complex nucleosome assembly and suggest how Chd1 and FACT jointly support transcription by RNAPII.
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Affiliation(s)
- Maik Engeholm
- Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany.
| | - Johann J Roske
- Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany; MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK
| | - Elisa Oberbeckmann
- Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Christian Dienemann
- Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Michael Lidschreiber
- Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Patrick Cramer
- Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany.
| | - Lucas Farnung
- Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany; Harvard Medical School, Blavatnik Institute, Department of Cell Biology, 240 Longwood Avenue, Boston, MA 02115, USA.
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3
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Peña-Diaz P, Braymer JJ, Vacek V, Zelená M, Lometto S, Mais CN, Hrdý I, Treitli SC, Hochberg GKA, Py B, Lill R, Hampl V. Characterization of the SUF FeS cluster synthesis machinery in the amitochondriate eukaryote Monocercomonoides exilis. Curr Biol 2024; 34:3855-3865.e7. [PMID: 39089256 DOI: 10.1016/j.cub.2024.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 06/06/2024] [Accepted: 07/02/2024] [Indexed: 08/03/2024]
Abstract
Monocercomonoides exilis is the first known amitochondriate eukaryote. Loss of mitochondria in M. exilis ocurred after the replacement of the essential mitochondrial iron-sulfur cluster (ISC) assembly machinery by a unique, bacteria-derived, cytosolic SUF system. It has been hypothesized that the MeSuf pathway, in cooperation with proteins of the cytosolic iron-sulfur protein assembly (CIA) system, is responsible for the biogenesis of FeS clusters in M. exilis, yet biochemical evidence is pending. Here, we address the M. exilis MeSuf system and show that SUF genes, individually or in tandem, support the loading of iron-sulfur (FeS) clusters into the reporter protein IscR in Escherichia coli. The Suf proteins MeSufB, MeSufC, and MeSufDSU interact in vivo with one another and with Suf proteins of E. coli. In vitro, the M. exilis Suf proteins form large complexes of varying composition and hence may function as a dynamic biosynthetic system in the protist. The putative FeS cluster scaffold MeSufB-MeSufC (MeSufBC) forms multiple oligomeric complexes, some of which bind FeS clusters and form selectively only in the presence of adenosine nucleotides. The multi-domain fusion protein MeSufDSU binds a PLP cofactor and can form higher-order complexes with MeSufB and MeSufC. Our work demonstrates the biochemical property of M. exilis Suf proteins to act as a functional FeS cluster assembly system and provides insights into the molecular mechanism of this unique eukaryotic SUF system.
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Affiliation(s)
- Priscila Peña-Diaz
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic.
| | - Joseph J Braymer
- Institut für Zytobiologie und Zytopathologie, Fachbereich Medizin, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032 Marburg, Germany; Zentrum für Synthetische Mikrobiologie Synmikro, Philipps-Universität Marburg, Karl-von-Frisch-Straße 14, 35032 Marburg, Germany.
| | - Vojtěch Vacek
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic
| | - Marie Zelená
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic
| | - Stefano Lometto
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043 Marburg, Germany
| | - Christopher-Nils Mais
- Zentrum für Synthetische Mikrobiologie Synmikro, Philipps-Universität Marburg, Karl-von-Frisch-Straße 14, 35032 Marburg, Germany; Department of Chemistry, University of Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - Ivan Hrdý
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic
| | - Sebastian C Treitli
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic
| | - Georg K A Hochberg
- Zentrum für Synthetische Mikrobiologie Synmikro, Philipps-Universität Marburg, Karl-von-Frisch-Straße 14, 35032 Marburg, Germany; Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043 Marburg, Germany; Department of Chemistry, University of Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - Béatrice Py
- Laboratoire de Chimie Bactérienne, CNRS-Aix Marseille Université, UMR 7283, Institut de Microbiologie de la Méditerranée, Institut de Microbiologie, Bioénergies et Biotechnologies, Marseille, France
| | - Roland Lill
- Institut für Zytobiologie und Zytopathologie, Fachbereich Medizin, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032 Marburg, Germany; Zentrum für Synthetische Mikrobiologie Synmikro, Philipps-Universität Marburg, Karl-von-Frisch-Straße 14, 35032 Marburg, Germany
| | - Vladimír Hampl
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic.
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4
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Lin MH, Jensen MK, Elrod ND, Chu HF, Haseley M, Beam AC, Huang KL, Chiang W, Russell WK, Williams K, Pröschel C, Wagner EJ, Tong L. Cytoplasmic binding partners of the Integrator endonuclease INTS11 and its paralog CPSF73 are required for their nuclear function. Mol Cell 2024; 84:2900-2917.e10. [PMID: 39032490 PMCID: PMC11316654 DOI: 10.1016/j.molcel.2024.06.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 06/04/2024] [Accepted: 06/18/2024] [Indexed: 07/23/2024]
Abstract
INTS11 and CPSF73 are metal-dependent endonucleases for Integrator and pre-mRNA 3'-end processing, respectively. Here, we show that the INTS11 binding partner BRAT1/CG7044, a factor important for neuronal fitness, stabilizes INTS11 in the cytoplasm and is required for Integrator function in the nucleus. Loss of BRAT1 in neural organoids leads to transcriptomic disruption and precocious expression of neurogenesis-driving transcription factors. The structures of the human INTS9-INTS11-BRAT1 and Drosophila dIntS11-CG7044 complexes reveal that the conserved C terminus of BRAT1/CG7044 is captured in the active site of INTS11, with a cysteine residue directly coordinating the metal ions. Inspired by these observations, we find that UBE3D is a binding partner for CPSF73, and UBE3D likely also uses a conserved cysteine residue to directly coordinate the active site metal ions. Our studies have revealed binding partners for INTS11 and CPSF73 that behave like cytoplasmic chaperones with a conserved impact on the nuclear functions of these enzymes.
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Affiliation(s)
- Min-Han Lin
- Department of Biological Sciences, Columbia University, New York, NY 10027, USA
| | - Madeline K Jensen
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA; Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77550, USA
| | - Nathan D Elrod
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77550, USA
| | - Hsu-Feng Chu
- Department of Biological Sciences, Columbia University, New York, NY 10027, USA
| | - MaryClaire Haseley
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Alissa C Beam
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Kai-Lieh Huang
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA; Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77550, USA
| | - Wesley Chiang
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - William K Russell
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77550, USA
| | - Kelsey Williams
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA; Department of Biomedical Genetics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Christoph Pröschel
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA; Department of Biomedical Genetics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Eric J Wagner
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA; Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77550, USA.
| | - Liang Tong
- Department of Biological Sciences, Columbia University, New York, NY 10027, USA.
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5
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Sabath K, Qiu C, Jonas S. Assembly mechanism of Integrator's RNA cleavage module. Mol Cell 2024; 84:2882-2899.e10. [PMID: 39032489 DOI: 10.1016/j.molcel.2024.06.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 05/17/2024] [Accepted: 06/26/2024] [Indexed: 07/23/2024]
Abstract
The modular Integrator complex is a transcription regulator that is essential for embryonic development. It attenuates coding gene expression via premature transcription termination and performs 3'-processing of non-coding RNAs. For both activities, Integrator requires endonuclease activity that is harbored by an RNA cleavage module consisting of INTS4-9-11. How correct assembly of Integrator modules is achieved remains unknown. Here, we show that BRAT1 and WDR73 are critical biogenesis factors for the human cleavage module. They maintain INTS9-11 inactive during maturation by physically blocking the endonuclease active site and prevent premature INTS4 association. Furthermore, BRAT1 facilitates import of INTS9-11 into the nucleus, where it is joined by INTS4. Final BRAT1 release requires locking of the mature cleavage module conformation by inositol hexaphosphate (IP6). Our data explain several neurodevelopmental disorders caused by BRAT1, WDR73, and INTS11 mutations as Integrator assembly defects and reveal that IP6 is an essential co-factor for cleavage module maturation.
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Affiliation(s)
- Kevin Sabath
- Institute of Molecular Biology and Biophysics, ETH Zurich, Zurich, Switzerland
| | - Chunhong Qiu
- Institute of Molecular Biology and Biophysics, ETH Zurich, Zurich, Switzerland
| | - Stefanie Jonas
- Institute of Molecular Biology and Biophysics, ETH Zurich, Zurich, Switzerland.
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6
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Karasu ME, Jahnke L, Joseph BJ, Amerzhanova Y, Mironov A, Shu X, Schröder MS, Gvozdenovic A, Sala I, Zavolan M, Jonas S, Corn JE. CCAR1 promotes DNA repair via alternative splicing. Mol Cell 2024; 84:2634-2647.e9. [PMID: 38964321 DOI: 10.1016/j.molcel.2024.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 04/29/2024] [Accepted: 06/12/2024] [Indexed: 07/06/2024]
Abstract
DNA repair is directly performed by hundreds of core factors and indirectly regulated by thousands of others. We massively expanded a CRISPR inhibition and Cas9-editing screening system to discover factors indirectly modulating homology-directed repair (HDR) in the context of ∼18,000 individual gene knockdowns. We focused on CCAR1, a poorly understood gene that we found the depletion of reduced both HDR and interstrand crosslink repair, phenocopying the loss of the Fanconi anemia pathway. CCAR1 loss abrogated FANCA protein without substantial reduction in the level of its mRNA or that of other FA genes. We instead found that CCAR1 prevents inclusion of a poison exon in FANCA. Transcriptomic analysis revealed that the CCAR1 splicing modulatory activity is not limited to FANCA, and it instead regulates widespread changes in alternative splicing that would damage coding sequences in mouse and human cells. CCAR1 therefore has an unanticipated function as a splicing fidelity factor.
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Affiliation(s)
- Mehmet E Karasu
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Leonard Jahnke
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Brian J Joseph
- Department of Pathology and Cell Biology, Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
| | - Yerkezhan Amerzhanova
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Aleksei Mironov
- Computational and Systems Biology, Biozentrum, University of Basel, 4056 Basel, Switzerland
| | - Xuan Shu
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Markus S Schröder
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Ana Gvozdenovic
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Irene Sala
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Mihaela Zavolan
- Computational and Systems Biology, Biozentrum, University of Basel, 4056 Basel, Switzerland
| | - Stefanie Jonas
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland
| | - Jacob E Corn
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich 8093, Switzerland.
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7
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van den Heuvel D, Rodríguez-Martínez M, van der Meer PJ, Moreno NN, Park J, Kim HS, van Schie JJM, Wondergem AP, D'Souza A, Yakoub G, Herlihy AE, Kashyap K, Boissière T, Walker J, Mitter R, Apelt K, de Lint K, Kirdök I, Ljungman M, Wolthuis RMF, Cramer P, Schärer OD, Kokic G, Svejstrup JQ, Luijsterburg MS. STK19 facilitates the clearance of lesion-stalled RNAPII during transcription-coupled DNA repair. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.22.604575. [PMID: 39091731 PMCID: PMC11291029 DOI: 10.1101/2024.07.22.604575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
Transcription-coupled DNA repair (TCR) removes bulky DNA lesions impeding RNA polymerase II (RNAPII) transcription. Recent studies have outlined the stepwise assembly of TCR factors CSB, CSA, UVSSA, and TFIIH around lesion-stalled RNAPII. However, the mechanism and factors required for the transition to downstream repair steps, including RNAPII removal to provide repair proteins access to the DNA lesion, remain unclear. Here, we identify STK19 as a new TCR factor facilitating this transition. Loss of STK19 does not impact initial TCR complex assembly or RNAPII ubiquitylation but delays lesion-stalled RNAPII clearance, thereby interfering with the downstream repair reaction. Cryo-EM and mutational analysis reveal that STK19 associates with the TCR complex, positioning itself between RNAPII, UVSSA, and CSA. The structural insights and molecular modeling suggest that STK19 positions the ATPase subunits of TFIIH onto DNA in front of RNAPII. Together, these findings provide new insights into the factors and mechanisms required for TCR.
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8
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Sabath K, Nabih A, Arnold C, Moussa R, Domjan D, Zaugg JB, Jonas S. Basis of gene-specific transcription regulation by the Integrator complex. Mol Cell 2024; 84:2525-2541.e12. [PMID: 38906142 DOI: 10.1016/j.molcel.2024.05.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 03/04/2024] [Accepted: 05/29/2024] [Indexed: 06/23/2024]
Abstract
The Integrator complex attenuates gene expression via the premature termination of RNA polymerase II (RNAP2) at promoter-proximal pausing sites. It is required for stimulus response, cell differentiation, and neurodevelopment, but how gene-specific and adaptive regulation by Integrator is achieved remains unclear. Here, we identify two sites on human Integrator subunits 13/14 that serve as binding hubs for sequence-specific transcription factors (TFs) and other transcription effector complexes. When Integrator is attached to paused RNAP2, these hubs are positioned upstream of the transcription bubble, consistent with simultaneous TF-promoter tethering. The TFs co-localize with Integrator genome-wide, increase Integrator abundance on target genes, and co-regulate responsive transcriptional programs. For instance, sensory cilia formation induced by glucose starvation depends on Integrator-TF contacts. Our data suggest TF-mediated promoter recruitment of Integrator as a widespread mechanism for targeted transcription regulation.
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Affiliation(s)
- Kevin Sabath
- Department of Biology, Institute of Molecular Biology and Biophysics, ETH Zurich, 8093 Zurich, Switzerland.
| | - Amena Nabih
- Department of Biology, Institute of Molecular Biology and Biophysics, ETH Zurich, 8093 Zurich, Switzerland
| | - Christian Arnold
- European Molecular Biology Laboratory, Structural and Computational Biology Unit, 69117 Heidelberg, Germany
| | - Rim Moussa
- European Molecular Biology Laboratory, Structural and Computational Biology Unit, 69117 Heidelberg, Germany
| | - David Domjan
- Department of Biology, Institute of Molecular Biology and Biophysics, ETH Zurich, 8093 Zurich, Switzerland
| | - Judith B Zaugg
- European Molecular Biology Laboratory, Structural and Computational Biology Unit, 69117 Heidelberg, Germany
| | - Stefanie Jonas
- Department of Biology, Institute of Molecular Biology and Biophysics, ETH Zurich, 8093 Zurich, Switzerland.
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9
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Papadopoulos D, Ha SA, Fleischhauer D, Uhl L, Russell TJ, Mikicic I, Schneider K, Brem A, Valanju OR, Cossa G, Gallant P, Schuelein-Voelk C, Maric HM, Beli P, Büchel G, Vos SM, Eilers M. The MYCN oncoprotein is an RNA-binding accessory factor of the nuclear exosome targeting complex. Mol Cell 2024; 84:2070-2086.e20. [PMID: 38703770 DOI: 10.1016/j.molcel.2024.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 02/28/2024] [Accepted: 04/10/2024] [Indexed: 05/06/2024]
Abstract
The MYCN oncoprotein binds active promoters in a heterodimer with its partner protein MAX. MYCN also interacts with the nuclear exosome, a 3'-5' exoribonuclease complex, suggesting a function in RNA metabolism. Here, we show that MYCN forms stable high-molecular-weight complexes with the exosome and multiple RNA-binding proteins. MYCN binds RNA in vitro and in cells via a conserved sequence termed MYCBoxI. In cells, MYCN associates with thousands of intronic transcripts together with the ZCCHC8 subunit of the nuclear exosome targeting complex and enhances their processing. Perturbing exosome function results in global re-localization of MYCN from promoters to intronic RNAs. On chromatin, MYCN is then replaced by the MNT(MXD6) repressor protein, inhibiting MYCN-dependent transcription. RNA-binding-deficient alleles show that RNA-binding limits MYCN's ability to activate cell growth-related genes but is required for MYCN's ability to promote progression through S phase and enhance the stress resilience of neuroblastoma cells.
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Affiliation(s)
- Dimitrios Papadopoulos
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany; Mildred Scheel Early Career Center, University Hospital Würzburg, Josef-Schneider-Str. 6, 97080 Würzburg, Germany
| | - Stefanie Anh Ha
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Daniel Fleischhauer
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Leonie Uhl
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Timothy J Russell
- Massachusetts Institute of Technology, Department of Biology, 31 Ames Street, Cambridge, MA 02142, USA
| | - Ivan Mikicic
- Institute of Developmental Biology and Neurobiology (IDN), Johannes Gutenberg University, Ackermannweg 4, 55128 Mainz, Germany; Institute of Molecular Biology (IMB), Johannes Gutenberg University, Ackermannweg 4, 55128 Mainz, Germany
| | - Katharina Schneider
- Massachusetts Institute of Technology, Department of Biology, 31 Ames Street, Cambridge, MA 02142, USA
| | - Annika Brem
- Massachusetts Institute of Technology, Department of Biology, 31 Ames Street, Cambridge, MA 02142, USA
| | - Omkar Rajendra Valanju
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Josef-Schneider-Str. 2, Building D15, 97080 Würzburg, Germany
| | - Giacomo Cossa
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Peter Gallant
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Christina Schuelein-Voelk
- Theodor Boveri Institute, Core Unit High-Content Microscopy, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Hans Michael Maric
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Josef-Schneider-Str. 2, Building D15, 97080 Würzburg, Germany
| | - Petra Beli
- Institute of Developmental Biology and Neurobiology (IDN), Johannes Gutenberg University, Ackermannweg 4, 55128 Mainz, Germany; Institute of Molecular Biology (IMB), Johannes Gutenberg University, Ackermannweg 4, 55128 Mainz, Germany
| | - Gabriele Büchel
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany; Mildred Scheel Early Career Center, University Hospital Würzburg, Josef-Schneider-Str. 6, 97080 Würzburg, Germany
| | - Seychelle M Vos
- Massachusetts Institute of Technology, Department of Biology, 31 Ames Street, Cambridge, MA 02142, USA.
| | - Martin Eilers
- Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany.
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10
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Fianu I, Ochmann M, Walshe JL, Dybkov O, Cruz JN, Urlaub H, Cramer P. Structural basis of Integrator-dependent RNA polymerase II termination. Nature 2024; 629:219-227. [PMID: 38570683 PMCID: PMC11062913 DOI: 10.1038/s41586-024-07269-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 03/05/2024] [Indexed: 04/05/2024]
Abstract
The Integrator complex can terminate RNA polymerase II (Pol II) in the promoter-proximal region of genes. Previous work has shed light on how Integrator binds to the paused elongation complex consisting of Pol II, the DRB sensitivity-inducing factor (DSIF) and the negative elongation factor (NELF) and how it cleaves the nascent RNA transcript1, but has not explained how Integrator removes Pol II from the DNA template. Here we present three cryo-electron microscopy structures of the complete Integrator-PP2A complex in different functional states. The structure of the pre-termination complex reveals a previously unresolved, scorpion-tail-shaped INTS10-INTS13-INTS14-INTS15 module that may use its 'sting' to open the DSIF DNA clamp and facilitate termination. The structure of the post-termination complex shows that the previously unresolved subunit INTS3 and associated sensor of single-stranded DNA complex (SOSS) factors prevent Pol II rebinding to Integrator after termination. The structure of the free Integrator-PP2A complex in an inactive closed conformation2 reveals that INTS6 blocks the PP2A phosphatase active site. These results lead to a model for how Integrator terminates Pol II transcription in three steps that involve major rearrangements.
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Affiliation(s)
- Isaac Fianu
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
| | - Moritz Ochmann
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - James L Walshe
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Olexandr Dybkov
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Joseph Neos Cruz
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Institute of Clinical Chemistry, Bioanalytics Group, University Medical Center Göttingen, Göttingen, Germany
- Cluster of Excellence 'Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells' (MBExC), University of Göttingen, Göttingen, Germany
| | - Patrick Cramer
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
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11
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Yang R, Hunker O, Wise M, Bleichert F. Multiple pathways for licensing human replication origins. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.10.588796. [PMID: 38645015 PMCID: PMC11030351 DOI: 10.1101/2024.04.10.588796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
The loading of replicative helicases constitutes an obligatory step in the assembly of DNA replication machineries. In eukaryotes, the MCM2-7 replicative helicase motor is deposited onto DNA by the origin recognition complex (ORC) and co-loader proteins as a head-to-head MCM double hexamer to license replication origins. Although extensively studied in the budding yeast model system, the mechanisms of origin licensing in higher eukaryotes remain poorly defined. Here, we use biochemical reconstitution and electron microscopy (EM) to reconstruct the human MCM loading pathway. Unexpectedly, we find that, unlike in yeast, ORC's Orc6 subunit is not essential for human MCM loading but can enhance loading efficiency. EM analyses identify several intermediates en route to MCM double hexamer formation in the presence and absence of Orc6, including an abundant DNA-loaded, closed-ring single MCM hexamer intermediate that can mature into a head-to-head double hexamer through different pathways. In an Orc6-facilitated pathway, ORC and a second MCM2-7 hexamer are recruited to the dimerization interface of the first hexamer through an MCM-ORC intermediate that is architecturally distinct from an analogous intermediate in yeast. In an alternative, Orc6-independent pathway, MCM double hexamer formation proceeds through dimerization of two independently loaded single MCM2-7 hexamers, promoted by a propensity of human MCM2-7 hexamers to dimerize without the help of other loading factors. This redundancy in human MCM loading pathways likely provides resilience against replication stress under cellular conditions by ensuring that enough origins are licensed for efficient DNA replication. Additionally, the biochemical reconstitution of human origin licensing paves the way to address many outstanding questions regarding DNA replication initiation and replication-coupled events in higher eukaryotes in the future.
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Affiliation(s)
| | | | - Marleigh Wise
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA
| | - Franziska Bleichert
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA
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12
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Cushing VI, Koh AF, Feng J, Jurgaityte K, Bondke A, Kroll SHB, Barbazanges M, Scheiper B, Bahl AK, Barrett AGM, Ali S, Kotecha A, Greber BJ. High-resolution cryo-EM of the human CDK-activating kinase for structure-based drug design. Nat Commun 2024; 15:2265. [PMID: 38480681 PMCID: PMC10937634 DOI: 10.1038/s41467-024-46375-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 02/23/2024] [Indexed: 03/17/2024] Open
Abstract
Rational design of next-generation therapeutics can be facilitated by high-resolution structures of drug targets bound to small-molecule inhibitors. However, application of structure-based methods to macromolecules refractory to crystallization has been hampered by the often-limiting resolution and throughput of cryogenic electron microscopy (cryo-EM). Here, we use high-resolution cryo-EM to determine structures of the CDK-activating kinase, a master regulator of cell growth and division, in its free and nucleotide-bound states and in complex with 15 inhibitors at up to 1.8 Å resolution. Our structures provide detailed insight into inhibitor interactions and networks of water molecules in the active site of cyclin-dependent kinase 7 and provide insights into the mechanisms contributing to inhibitor selectivity, thereby providing the basis for rational design of next-generation therapeutics. These results establish a methodological framework for the use of high-resolution cryo-EM in structure-based drug design.
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Affiliation(s)
- Victoria I Cushing
- The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK
| | - Adrian F Koh
- Materials and Structural Analysis Division, Thermo Fisher Scientific, Achtseweg Noord 5, 5651, Eindhoven, The Netherlands
| | - Junjie Feng
- The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK
| | - Kaste Jurgaityte
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | | | | | - Marion Barbazanges
- Department of Chemistry, Imperial College London, London, UK
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, 4 Place Jussieu, 75252, Paris Cedex 05, France
| | - Bodo Scheiper
- Department of Chemistry, Imperial College London, London, UK
| | - Ash K Bahl
- Carrick Therapeutics, Nova UCD, Bellfield Innovation Park, Dublin 4, Ireland
| | | | - Simak Ali
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK.
| | - Abhay Kotecha
- Materials and Structural Analysis Division, Thermo Fisher Scientific, Achtseweg Noord 5, 5651, Eindhoven, The Netherlands.
| | - Basil J Greber
- The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK.
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13
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Blee AM, Gallagher K, Kim HS, Kim M, Kharat S, Troll C, D’Souza A, Park J, Neufer P, Schärer O, Chazin W. XPA tumor variant leads to defects in NER that sensitize cells to cisplatin. NAR Cancer 2024; 6:zcae013. [PMID: 38500596 PMCID: PMC10946055 DOI: 10.1093/narcan/zcae013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 01/27/2024] [Accepted: 02/29/2024] [Indexed: 03/20/2024] Open
Abstract
Nucleotide excision repair (NER) reduces efficacy of treatment with platinum (Pt)-based chemotherapy by removing Pt lesions from DNA. Previous study has identified that missense mutation or loss of the NER genes Excision Repair Cross Complementation Group 1 and 2 (ERCC1 and ERCC2) leads to improved patient outcomes after treatment with Pt-based chemotherapies. Although most NER gene alterations found in patient tumors are missense mutations, the impact of mutations in the remaining nearly 20 NER genes is unknown. Towards this goal, we previously developed a machine learning strategy to predict genetic variants in an essential NER protein, Xeroderma Pigmentosum Complementation Group A (XPA), that disrupt repair. In this study, we report in-depth analyses of a subset of the predicted variants, including in vitro analyses of purified recombinant protein and cell-based assays to test Pt agent sensitivity in cells and determine mechanisms of NER dysfunction. The most NER deficient variant Y148D had reduced protein stability, weaker DNA binding, disrupted recruitment to damage, and degradation. Our findings demonstrate that tumor mutations in XPA impact cell survival after cisplatin treatment and provide valuable mechanistic insights to improve variant effect prediction. Broadly, these findings suggest XPA tumor variants should be considered when predicting chemotherapy response.
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Affiliation(s)
- Alexandra M Blee
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37205, USA
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
| | - Kaitlyn S Gallagher
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37205, USA
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
| | - Hyun-Suk Kim
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
| | - Mihyun Kim
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
- Department of Biological Sciences, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
| | - Suhas S Kharat
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37205, USA
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
| | - Christina R Troll
- Department of Chemistry, Vanderbilt University, Nashville, TN 37240, USA
| | - Areetha D’Souza
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37205, USA
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
| | - Jiyoung Park
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
| | - P Drew Neufer
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37205, USA
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
| | - Orlando D Schärer
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37205, USA
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
- Department of Biological Sciences, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
| | - Walter J Chazin
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37205, USA
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
- Department of Chemistry, Vanderbilt University, Nashville, TN 37240, USA
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14
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Kokic G, Yakoub G, van den Heuvel D, Wondergem AP, van der Meer PJ, van der Weegen Y, Chernev A, Fianu I, Fokkens TJ, Lorenz S, Urlaub H, Cramer P, Luijsterburg MS. Structural basis for RNA polymerase II ubiquitylation and inactivation in transcription-coupled repair. Nat Struct Mol Biol 2024; 31:536-547. [PMID: 38316879 PMCID: PMC10948364 DOI: 10.1038/s41594-023-01207-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 12/21/2023] [Indexed: 02/07/2024]
Abstract
During transcription-coupled DNA repair (TCR), RNA polymerase II (Pol II) transitions from a transcriptionally active state to an arrested state that allows for removal of DNA lesions. This transition requires site-specific ubiquitylation of Pol II by the CRL4CSA ubiquitin ligase, a process that is facilitated by ELOF1 in an unknown way. Using cryogenic electron microscopy, biochemical assays and cell biology approaches, we found that ELOF1 serves as an adaptor to stably position UVSSA and CRL4CSA on arrested Pol II, leading to ligase neddylation and activation of Pol II ubiquitylation. In the presence of ELOF1, a transcription factor IIS (TFIIS)-like element in UVSSA gets ordered and extends through the Pol II pore, thus preventing reactivation of Pol II by TFIIS. Our results provide the structural basis for Pol II ubiquitylation and inactivation in TCR.
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Affiliation(s)
- Goran Kokic
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Division of Structural Biology and Protein Therapeutics, Odyssey Therapeutics GmbH, Frankfurt am Main, Germany
| | - George Yakoub
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Diana van den Heuvel
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Annelotte P Wondergem
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Paula J van der Meer
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Yana van der Weegen
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Aleksandar Chernev
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Isaac Fianu
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Thornton J Fokkens
- Ubiquitin Signaling Specificity, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Sonja Lorenz
- Ubiquitin Signaling Specificity, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Bioanalytics Group, University Medical Center Göttingen, Institute of Clinical Chemistry, Göttingen, Germany
| | - Patrick Cramer
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
| | - Martijn S Luijsterburg
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands.
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15
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Errani F, Invernizzi A, Herok M, Bochenkova E, Stamm F, Corbeski I, Romanucci V, Di Fabio G, Zálešák F, Caflisch A. Proteolysis Targeting Chimera Degraders of the METTL3-14 m 6A-RNA Methyltransferase. JACS AU 2024; 4:713-729. [PMID: 38425900 PMCID: PMC10900215 DOI: 10.1021/jacsau.4c00040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 02/01/2024] [Accepted: 02/01/2024] [Indexed: 03/02/2024]
Abstract
Methylation of adenine N6 (m6A) is the most frequent RNA modification. On mRNA, it is catalyzed by the METTL3-14 heterodimer complex, which plays a key role in acute myeloid leukemia (AML) and other types of blood cancers and solid tumors. Here, we disclose the first proteolysis targeting chimeras (PROTACs) for an epitranscriptomics protein. For designing the PROTACs, we made use of the crystal structure of the complex of METTL3-14 with a potent and selective small-molecule inhibitor (called UZH2). The optimization of the linker started from a desfluoro precursor of UZH2 whose synthesis is more efficient than that of UZH2. The first nine PROTAC molecules featured PEG- or alkyl-based linkers, but only the latter showed cell penetration. With this information in hand, we synthesized 26 PROTACs based on UZH2 and alkyl linkers of different lengths and rigidity. The formation of the ternary complex was validated by a FRET-based biochemical assay and an in vitro ubiquitination assay. The PROTACs 14, 20, 22, 24, and 30, featuring different linker types and lengths, showed 50% or higher degradation of METTL3 and/or METTL14 measured by Western blot in MOLM-13 cells. They also showed substantial degradation on three other AML cell lines and prostate cancer cell line PC3.
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Affiliation(s)
- Francesco Errani
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Annalisa Invernizzi
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Marcin Herok
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Elena Bochenkova
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Fiona Stamm
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Ivan Corbeski
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Valeria Romanucci
- Università
degli Studi di Napoli Federico II, Via Cintia 4, Napoli I-80126, Italia
| | - Giovanni Di Fabio
- Università
degli Studi di Napoli Federico II, Via Cintia 4, Napoli I-80126, Italia
| | - František Zálešák
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Amedeo Caflisch
- Department
of Biochemistry, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
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16
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Ching C, Brychcy M, Nguyen B, Muller P, Pearson AR, Downs M, Regan S, Isley B, Fowle W, Chai Y, Godoy VG. RecA levels modulate biofilm development in Acinetobacter baumannii. Mol Microbiol 2024; 121:196-212. [PMID: 37918886 DOI: 10.1111/mmi.15188] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 10/06/2023] [Accepted: 10/17/2023] [Indexed: 11/04/2023]
Abstract
Infections caused by Acinetobacter baumannii, a Gram-negative opportunistic pathogen, are difficult to eradicate due to the bacterium's propensity to quickly gain antibiotic resistances and form biofilms, a protective bacterial multicellular community. The A. baumannii DNA damage response (DDR) mediates the antibiotic resistance acquisition and regulates RecA in an atypical fashion; both RecALow and RecAHigh cell types are formed in response to DNA damage. The findings of this study demonstrate that the levels of RecA can influence formation and dispersal of biofilms. RecA loss results in surface attachment and prominent biofilms, while elevated RecA leads to diminished attachment and dispersal. These findings suggest that the challenge to treat A. baumannii infections may be explained by the induction of the DDR, common during infection, as well as the delicate balance between maintaining biofilms in low RecA cells and promoting mutagenesis and dispersal in high RecA cells. This study underscores the importance of understanding the fundamental biology of bacteria to develop more effective treatments for infections.
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Affiliation(s)
- Carly Ching
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - Merlin Brychcy
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - Brian Nguyen
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - Paul Muller
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | | | - Margaret Downs
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - Samuel Regan
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - Breanna Isley
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - William Fowle
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - Yunrong Chai
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
| | - Veronica G Godoy
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
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17
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Chen Y, Kokic G, Dienemann C, Dybkov O, Urlaub H, Cramer P. Structure of the transcribing RNA polymerase II-Elongin complex. Nat Struct Mol Biol 2023; 30:1925-1935. [PMID: 37932450 PMCID: PMC10716050 DOI: 10.1038/s41594-023-01138-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 09/26/2023] [Indexed: 11/08/2023]
Abstract
Elongin is a heterotrimeric elongation factor for RNA polymerase (Pol) II transcription that is conserved among metazoa. Here, we report three cryo-EM structures of human Elongin bound to transcribing Pol II. The structures show that Elongin subunit ELOA binds the RPB2 side of Pol II and anchors the ELOB-ELOC subunit heterodimer. ELOA contains a 'latch' that binds between the end of the Pol II bridge helix and funnel helices, thereby inducing a conformational change near the polymerase active center. The latch is required for the elongation-stimulatory activity of Elongin, but not for Pol II binding, indicating that Elongin functions by allosterically regulating the conformational mobility of the polymerase active center. Elongin binding to Pol II is incompatible with association of the super elongation complex, PAF1 complex and RTF1, which also contain an elongation-stimulatory latch element.
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Affiliation(s)
- Ying Chen
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Department of Clinical Laboratory, Qilu Hospital of Shandong University, Jinan, China
| | - Goran Kokic
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Christian Dienemann
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Olexandr Dybkov
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- University Medical Center Göttingen, Institute of Clinical Chemistry, Bioanalytics Group, Göttingen, Germany
- Cluster of Excellence 'Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells' (MBExC), University of Göttingen, Göttingen, Germany
| | - Patrick Cramer
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
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18
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Sauer PV, Pavlenko E, Cookis T, Zirden LC, Renn J, Singhal A, Hunold P, Hoehne MN, van Ray O, Hänsel-Hertsch R, Sanbonmatsu KY, Nogales E, Poepsel S. Activation of automethylated PRC2 by dimerization on chromatin. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.12.562141. [PMID: 37873121 PMCID: PMC10592840 DOI: 10.1101/2023.10.12.562141] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Polycomb Repressive Complex 2 (PRC2) is an epigenetic regulator that trimethylates lysine 27 of histone 3 (H3K27me3) and is essential for embryonic development and cellular differentiation. H3K27me3 is associated with transcriptionally repressed chromatin and is established when PRC2 is allosterically activated upon methyl-lysine binding by the regulatory subunit EED. Automethylation of the catalytic subunit EZH2 stimulates its activity by an unknown mechanism. Here, we show that PRC2 forms a dimer on chromatin in which an inactive, automethylated PRC2 protomer is the allosteric activator of a second PRC2 that is poised to methylate H3 of a substrate nucleosome. Functional assays support our model of allosteric trans-autoactivation via EED, suggesting a novel mechanism mediating context-dependent activation of PRC2. Our work showcases the molecular mechanism of auto-modification coupled dimerization in the regulation of chromatin modifying complexes.
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Affiliation(s)
- Paul V. Sauer
- California Institute for Quantitative Biology (QB3), University of California, Berkeley, California 94720, USA
- Howard Hughes Medical Institute, University of California, Berkeley, California 94720, USA
| | - Egor Pavlenko
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
| | - Trinity Cookis
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA
| | - Linda C. Zirden
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
| | - Juliane Renn
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
| | - Ankush Singhal
- Theoretical Biology and Biophysics, Theoretical Division, Los Alamos National Laboratory
| | - Pascal Hunold
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
- Department of Translational Genomics, Faculty of Medicine and University Hospital Cologne, University of Cologne, 50931, Cologne, Germany
| | - Michaela N. Hoehne
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
- Department of Translational Genomics, Faculty of Medicine and University Hospital Cologne, University of Cologne, 50931, Cologne, Germany
| | - Olivia van Ray
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
- Department of Translational Genomics, Faculty of Medicine and University Hospital Cologne, University of Cologne, 50931, Cologne, Germany
| | - Robert Hänsel-Hertsch
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
- Department of Translational Genomics, Faculty of Medicine and University Hospital Cologne, University of Cologne, 50931, Cologne, Germany
- Institute of Human Genetics, University Hospital Cologne, 50931 Cologne, Germany
- Cologne Excellence Cluster for Cellular Stress Responses in Ageing-Associated Diseases (CECAD), University of Cologne, Germany
| | - Karissa Y. Sanbonmatsu
- Theoretical Biology and Biophysics, Theoretical Division, Los Alamos National Laboratory
| | - Eva Nogales
- California Institute for Quantitative Biology (QB3), University of California, Berkeley, California 94720, USA
- Howard Hughes Medical Institute, University of California, Berkeley, California 94720, USA
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA
- Molecular Biophysics and Integrative Bio-Imaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Simon Poepsel
- Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, University of Cologne, Germany
- Cologne Excellence Cluster for Cellular Stress Responses in Ageing-Associated Diseases (CECAD), University of Cologne, Germany
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19
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Flores-Solis D, Lushpinskaia IP, Polyansky AA, Changiarath A, Boehning M, Mirkovic M, Walshe J, Pietrek LM, Cramer P, Stelzl LS, Zagrovic B, Zweckstetter M. Driving forces behind phase separation of the carboxy-terminal domain of RNA polymerase II. Nat Commun 2023; 14:5979. [PMID: 37749095 PMCID: PMC10519987 DOI: 10.1038/s41467-023-41633-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 09/10/2023] [Indexed: 09/27/2023] Open
Abstract
Eukaryotic gene regulation and pre-mRNA transcription depend on the carboxy-terminal domain (CTD) of RNA polymerase (Pol) II. Due to its highly repetitive, intrinsically disordered sequence, the CTD enables clustering and phase separation of Pol II. The molecular interactions that drive CTD phase separation and Pol II clustering are unclear. Here, we show that multivalent interactions involving tyrosine impart temperature- and concentration-dependent self-coacervation of the CTD. NMR spectroscopy, molecular ensemble calculations and all-atom molecular dynamics simulations demonstrate the presence of diverse tyrosine-engaging interactions, including tyrosine-proline contacts, in condensed states of human CTD and other low-complexity proteins. We further show that the network of multivalent interactions involving tyrosine is responsible for the co-recruitment of the human Mediator complex and CTD during phase separation. Our work advances the understanding of the driving forces of CTD phase separation and thus provides the basis to better understand CTD-mediated Pol II clustering in eukaryotic gene transcription.
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Affiliation(s)
- David Flores-Solis
- German Center for Neurodegenerative Diseases (DZNE), Von-Siebold Straße 3A, 35075, Göttingen, Germany
| | - Irina P Lushpinskaia
- German Center for Neurodegenerative Diseases (DZNE), Von-Siebold Straße 3A, 35075, Göttingen, Germany
| | - Anton A Polyansky
- Max Perutz Labs, Vienna Biocenter Campus (VBC), Campus Vienna Biocenter 5, 1030, Vienna, Austria
- University of Vienna, Center for Molecular Biology, Department of Structural and Computational Biology, Campus Vienna Biocenter 5, 1030, Vienna, Austria
| | - Arya Changiarath
- Faculty of Biology, Johannes Gutenberg University Mainz (JGU), Gresemundweg 2, 55128, Mainz, Germany
- KOMET1, Institute of Physics, Johannes Gutenberg University Mainz (JGU), Staudingerweg 9, 55099, Mainz, Germany
| | - Marc Boehning
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Am Faßberg 11, 37077, Göttingen, Germany
| | - Milana Mirkovic
- Max Perutz Labs, Vienna Biocenter Campus (VBC), Campus Vienna Biocenter 5, 1030, Vienna, Austria
- University of Vienna, Center for Molecular Biology, Department of Structural and Computational Biology, Campus Vienna Biocenter 5, 1030, Vienna, Austria
| | - James Walshe
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Am Faßberg 11, 37077, Göttingen, Germany
| | - Lisa M Pietrek
- Department of Theoretical Biophysics, Max Planck Institute of Biophysics, Max-von-Laue Strasße 3, 60438, Frankfurt am Main, Germany
| | - Patrick Cramer
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Am Faßberg 11, 37077, Göttingen, Germany
| | - Lukas S Stelzl
- Faculty of Biology, Johannes Gutenberg University Mainz (JGU), Gresemundweg 2, 55128, Mainz, Germany
- KOMET1, Institute of Physics, Johannes Gutenberg University Mainz (JGU), Staudingerweg 9, 55099, Mainz, Germany
- Institute of Molecular Biology (IMB), 55128, Mainz, Germany
| | - Bojan Zagrovic
- Max Perutz Labs, Vienna Biocenter Campus (VBC), Campus Vienna Biocenter 5, 1030, Vienna, Austria
- University of Vienna, Center for Molecular Biology, Department of Structural and Computational Biology, Campus Vienna Biocenter 5, 1030, Vienna, Austria
| | - Markus Zweckstetter
- German Center for Neurodegenerative Diseases (DZNE), Von-Siebold Straße 3A, 35075, Göttingen, Germany.
- Department of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Faßberg 11, 37077, Göttingen, Germany.
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20
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Balakrishnan S, Adolph M, Tsai MS, Gallagher K, Cortez D, Chazin WJ. Structure of RADX and mechanism for regulation of RAD51 nucleofilaments. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.19.558089. [PMID: 37786681 PMCID: PMC10541619 DOI: 10.1101/2023.09.19.558089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Replication fork reversal is a fundamental process required for resolution of encounters with DNA damage. A key step in the stabilization and eventual resolution of reversed forks is formation of RAD51 nucleoprotein filaments on exposed ssDNA. To avoid genome instability, RAD51 filaments are tightly controlled by a variety of positive and negative regulators. RADX is a recently discovered negative regulator that binds tightly to ssDNA, directly interacts with RAD51, and regulates replication fork reversal and stabilization in a context-dependent manner. Here we present a structure-based investigation of RADX's mechanism of action. Mass photometry experiments showed that RADX forms multiple oligomeric states in a concentration dependent manner, with a predominance of trimers in the presence of ssDNA. The structure of RADX, which has no structurally characterized orthologs, was determined ab initio by cryo-electron microscopy (EM) from maps in the 2-3 Å range. The structure reveals the molecular basis for RADX oligomerization and binding of ssDNA binding. The binding of RADX to RAD51 filaments was imaged by negative stain EM, which showed a RADX oligomer at the end of filaments. Based on these results, we propose a model in which RADX functions by capping and restricting the growing end of RAD51 filaments.
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Affiliation(s)
- Swati Balakrishnan
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37237, USA
| | - Madison Adolph
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37237, USA
| | - Miaw-Sheue Tsai
- Biological Systems and Bioengineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Kaitlyn Gallagher
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37237, USA
| | - David Cortez
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37237, USA
| | - Walter J. Chazin
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37237, USA
- Department of Chemistry, Vanderbilt University, Nashville, TN 37235, USA
- Lead contact
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21
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Longo MA, Roy S, Chen Y, Tomaszowski KH, Arvai AS, Pepper JT, Boisvert RA, Kunnimalaiyaan S, Keshvani C, Schild D, Bacolla A, Williams GJ, Tainer JA, Schlacher K. RAD51C-XRCC3 structure and cancer patient mutations define DNA replication roles. Nat Commun 2023; 14:4445. [PMID: 37488098 PMCID: PMC10366140 DOI: 10.1038/s41467-023-40096-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 07/07/2023] [Indexed: 07/26/2023] Open
Abstract
RAD51C is an enigmatic predisposition gene for breast, ovarian, and prostate cancer. Currently, missing structural and related functional understanding limits patient mutation interpretation to homology-directed repair (HDR) function analysis. Here we report the RAD51C-XRCC3 (CX3) X-ray co-crystal structure with bound ATP analog and define separable RAD51C replication stability roles informed by its three-dimensional structure, assembly, and unappreciated polymerization motif. Mapping of cancer patient mutations as a functional guide confirms ATP-binding matching RAD51 recombinase, yet highlights distinct CX3 interfaces. Analyses of CRISPR/Cas9-edited human cells with RAD51C mutations combined with single-molecule, single-cell and biophysics measurements uncover discrete CX3 regions for DNA replication fork protection, restart and reversal, accomplished by separable functions in DNA binding and implied 5' RAD51 filament capping. Collective findings establish CX3 as a cancer-relevant replication stress response complex, show how HDR-proficient variants could contribute to tumor development, and identify regions to aid functional testing and classification of cancer mutations.
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Affiliation(s)
- Michael A Longo
- Department of Molecular & Cellular Oncology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Sunetra Roy
- Department of Cancer Biology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Yue Chen
- Department of Cancer Biology, UT MD Anderson Cancer Center, Houston, TX, USA
| | | | - Andrew S Arvai
- The Department of Integrative Structural & Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Jordan T Pepper
- Department of Biochemistry and Molecular Biology, Robson DNA Science Centre, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Rebecca A Boisvert
- Department of Cancer Biology, UT MD Anderson Cancer Center, Houston, TX, USA
| | | | - Caezanne Keshvani
- Department of Cancer Biology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - David Schild
- Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Albino Bacolla
- Department of Molecular & Cellular Oncology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Gareth J Williams
- Department of Biochemistry and Molecular Biology, Robson DNA Science Centre, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
| | - John A Tainer
- Department of Molecular & Cellular Oncology, UT MD Anderson Cancer Center, Houston, TX, USA.
- Department of Cancer Biology, UT MD Anderson Cancer Center, Houston, TX, USA.
| | - Katharina Schlacher
- Department of Cancer Biology, UT MD Anderson Cancer Center, Houston, TX, USA.
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22
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Beusch I, Rao B, Studer MK, Luhovska T, Šukytė V, Lei S, Oses-Prieto J, SeGraves E, Burlingame A, Jonas S, Madhani HD. Targeted high-throughput mutagenesis of the human spliceosome reveals its in vivo operating principles. Mol Cell 2023; 83:2578-2594.e9. [PMID: 37402368 PMCID: PMC10484158 DOI: 10.1016/j.molcel.2023.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 03/15/2023] [Accepted: 06/02/2023] [Indexed: 07/06/2023]
Abstract
The spliceosome is a staggeringly complex machine, comprising, in humans, 5 snRNAs and >150 proteins. We scaled haploid CRISPR-Cas9 base editing to target the entire human spliceosome and investigated the mutants using the U2 snRNP/SF3b inhibitor, pladienolide B. Hypersensitive substitutions define functional sites in the U1/U2-containing A complex but also in components that act as late as the second chemical step after SF3b is dissociated. Viable resistance substitutions map not only to the pladienolide B-binding site but also to the G-patch domain of SUGP1, which lacks orthologs in yeast. We used these mutants and biochemical approaches to identify the spliceosomal disassemblase DHX15/hPrp43 as the ATPase ligand for SUGP1. These and other data support a model in which SUGP1 promotes splicing fidelity by triggering early spliceosome disassembly in response to kinetic blocks. Our approach provides a template for the analysis of essential cellular machines in humans.
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Affiliation(s)
- Irene Beusch
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, USA
| | - Beiduo Rao
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, USA
| | - Michael K Studer
- Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zurich, Zurich, Switzerland
| | - Tetiana Luhovska
- Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zurich, Zurich, Switzerland
| | - Viktorija Šukytė
- Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zurich, Zurich, Switzerland
| | - Susan Lei
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, USA
| | - Juan Oses-Prieto
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, USA
| | - Em SeGraves
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, USA
| | - Alma Burlingame
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, USA
| | - Stefanie Jonas
- Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zurich, Zurich, Switzerland
| | - Hiten D Madhani
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, USA.
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23
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Townley BA, Buerer L, Tsao N, Bacolla A, Mansoori F, Rusanov T, Clark N, Goodarzi N, Schmidt N, Srivatsan SN, Sun H, Sample RA, Brickner JR, McDonald D, Tsai MS, Walter MJ, Wozniak DF, Holehouse AS, Pena V, Tainer JA, Fairbrother WG, Mosammaparast N. A functional link between lariat debranching enzyme and the intron-binding complex is defective in non-photosensitive trichothiodystrophy. Mol Cell 2023; 83:2258-2275.e11. [PMID: 37369199 PMCID: PMC10483886 DOI: 10.1016/j.molcel.2023.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 03/25/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023]
Abstract
The pre-mRNA life cycle requires intron processing; yet, how intron-processing defects influence splicing and gene expression is unclear. Here, we find that TTDN1/MPLKIP, which is encoded by a gene implicated in non-photosensitive trichothiodystrophy (NP-TTD), functionally links intron lariat processing to spliceosomal function. The conserved TTDN1 C-terminal region directly binds lariat debranching enzyme DBR1, whereas its N-terminal intrinsically disordered region (IDR) binds the intron-binding complex (IBC). TTDN1 loss, or a mutated IDR, causes significant intron lariat accumulation, as well as splicing and gene expression defects, mirroring phenotypes observed in NP-TTD patient cells. A Ttdn1-deficient mouse model recapitulates intron-processing defects and certain neurodevelopmental phenotypes seen in NP-TTD. Fusing DBR1 to the TTDN1 IDR is sufficient to recruit DBR1 to the IBC and circumvents the functional requirement for TTDN1. Collectively, our findings link RNA lariat processing with splicing outcomes by revealing the molecular function of TTDN1.
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Affiliation(s)
- Brittany A Townley
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Luke Buerer
- Center for Computational Molecular Biology, Department of Molecular Biology, Cell Biology & Biochemistry, Brown University, Providence, RI 02912, USA
| | - Ning Tsao
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Albino Bacolla
- Department of Molecular and Cellular Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA
| | - Fadhel Mansoori
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Timur Rusanov
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Nathanial Clark
- Center for Computational Molecular Biology, Department of Molecular Biology, Cell Biology & Biochemistry, Brown University, Providence, RI 02912, USA
| | - Negar Goodarzi
- Mechanisms and Regulation of Splicing Research Group, The Institute of Cancer Research, London, UK
| | - Nicolas Schmidt
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | | | - Hua Sun
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Reilly A Sample
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Joshua R Brickner
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Drew McDonald
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Miaw-Sheue Tsai
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Matthew J Walter
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - David F Wozniak
- Department of Psychiatry, Intellectual and Developmental Disabilities Research Center, Washington University School of Medicine, St. Louis, MO 63110-1093, USA
| | - Alex S Holehouse
- Department of Biochemistry & Molecular Biophysics, Washington University in St. Louis School of Medicine, St. Louis, MO 63110, USA; Center for Science and Engineering of Living Systems, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Vladimir Pena
- Mechanisms and Regulation of Splicing Research Group, The Institute of Cancer Research, London, UK
| | - John A Tainer
- Department of Molecular and Cellular Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA; Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - William G Fairbrother
- Center for Computational Molecular Biology, Department of Molecular Biology, Cell Biology & Biochemistry, Brown University, Providence, RI 02912, USA; Hassenfeld Child Health Innovation Institute of Brown University, Providence, RI 02912, USA.
| | - Nima Mosammaparast
- Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA.
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24
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Blee AM, Gallagher KS, Kim HS, Kim M, Troll CR, D'Souza A, Park J, Neufer PD, Schärer OD, Chazin WJ. XPA tumor variants lead to defects in NER that sensitize cells to cisplatin. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.29.547124. [PMID: 37425789 PMCID: PMC10327148 DOI: 10.1101/2023.06.29.547124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Nucleotide excision repair (NER) neutralizes treatment with platinum (Pt)-based chemotherapy by removing Pt lesions from DNA. Previous study has identified that missense mutation or loss of either of the NER genes Excision Repair Cross Complementation Group 1 and 2 ( ERCC1 and ERCC2 ) leads to improved patient outcomes after treatment with Pt-based chemotherapies. Although most NER gene alterations found in patient tumors are missense mutations, the impact of such mutations in the remaining nearly 20 NER genes is unknown. Towards this goal, we previously developed a machine learning strategy to predict genetic variants in an essential NER scaffold protein, Xeroderma Pigmentosum Complementation Group A (XPA), that disrupt repair activity on a UV-damaged substrate. In this study, we report in-depth analyses of a subset of the predicted NER-deficient XPA variants, including in vitro analyses of purified recombinant protein and cell-based assays to test Pt agent sensitivity in cells and determine mechanisms of NER dysfunction. The most NER deficient variant Y148D had reduced protein stability, weaker DNA binding, disrupted recruitment to damage, and degradation resulting from tumor missense mutation. Our findings demonstrate that tumor mutations in XPA impact cell survival after cisplatin treatment and provide valuable mechanistic insights to further improve variant effect prediction efforts. More broadly, these findings suggest XPA tumor variants should be considered when predicting patient response to Pt-based chemotherapy. Significance A destabilized, readily degraded tumor variant identified in the NER scaffold protein XPA sensitizes cells to cisplatin, suggesting that XPA variants can be used to predict response to chemotherapy.
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25
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Qin Y, Zhou Y, Cao Y, Ren Y, Deng P, Jiang J, Wang Z. Structural Basis of the Transcriptional Elongation Factor Paf1 Core Complex from Saccharomyces eubayanus. Int J Mol Sci 2023; 24:ijms24108730. [PMID: 37240075 DOI: 10.3390/ijms24108730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 05/08/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023] Open
Abstract
The multicomponent polymerase associated factor 1 (Paf1) complex (PAF1C) is an important transcription elongation factor that upregulates RNA polymerase II-mediated genome-wide transcription. PAF1C can regulate transcription through direct association with the polymerase or by impacting the chromatin structure epigenetically. In recent years, significant progress has been made in understanding the molecular mechanisms of PAF1C. However, high-resolution structures that can clarify the interaction details among the components of the complex are still needed. In this study, we evaluated the structural core of the yeast PAF1C containing the four components Ctr9, Paf1, Cdc73 and Rtf1 at high resolution. We observed the interaction details among these components. In particular, we identified a new binding surface of Rtf1 on PAF1C and found that the C-terminal sequence of Rtf1 dramatically changed during evolution, which may account for its different binding affinities to PAF1C among species. Our work presents a precise model of PAF1C, which will facilitate our understanding of the molecular mechanism and the in vivo function of the yeast PAF1C.
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Affiliation(s)
- Yan Qin
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
| | - Yuqiao Zhou
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
| | - Yinghua Cao
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
| | - Yanpeng Ren
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
| | - Pujuan Deng
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
| | - Junyi Jiang
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
| | - Zhanxin Wang
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, 19 Xinjiekouwai Avenue, Beijing 100875, China
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26
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van den Heuvel D, Kim M, Wondergem AP, van der Meer PJ, Witkamp M, Lambregtse F, Kim HS, Kan F, Apelt K, Kragten A, González-Prieto R, Vertegaal ACO, Yeo JE, Kim BG, van Doorn R, Schärer OD, Luijsterburg MS. A disease-associated XPA allele interferes with TFIIH binding and primarily affects transcription-coupled nucleotide excision repair. Proc Natl Acad Sci U S A 2023; 120:e2208860120. [PMID: 36893274 PMCID: PMC10089173 DOI: 10.1073/pnas.2208860120] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 01/30/2023] [Indexed: 03/11/2023] Open
Abstract
XPA is a central scaffold protein that coordinates the assembly of repair complexes in the global genome (GG-NER) and transcription-coupled nucleotide excision repair (TC-NER) subpathways. Inactivating mutations in XPA cause xeroderma pigmentosum (XP), which is characterized by extreme UV sensitivity and a highly elevated skin cancer risk. Here, we describe two Dutch siblings in their late forties carrying a homozygous H244R substitution in the C-terminus of XPA. They present with mild cutaneous manifestations of XP without skin cancer but suffer from marked neurological features, including cerebellar ataxia. We show that the mutant XPA protein has a severely weakened interaction with the transcription factor IIH (TFIIH) complex leading to an impaired association of the mutant XPA and the downstream endonuclease ERCC1-XPF with NER complexes. Despite these defects, the patient-derived fibroblasts and reconstituted knockout cells carrying the XPA-H244R substitution show intermediate UV sensitivity and considerable levels of residual GG-NER (~50%), in line with the intrinsic properties and activities of the purified protein. By contrast, XPA-H244R cells are exquisitely sensitive to transcription-blocking DNA damage, show no detectable recovery of transcription after UV irradiation, and display a severe deficiency in TC-NER-associated unscheduled DNA synthesis. Our characterization of a new case of XPA deficiency that interferes with TFIIH binding and primarily affects the transcription-coupled subpathway of nucleotide excision repair, provides an explanation of the dominant neurological features in these patients, and reveals a specific role for the C-terminus of XPA in TC-NER.
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Affiliation(s)
- Diana van den Heuvel
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Mihyun Kim
- Center for Genomic Integrity, Institute for Basic Science, 44919Ulsan, Republic of Korea
- Department of Biological Sciences, Ulsan National Institute of Science and Technology, 44919Ulsan, Republic of Korea
| | - Annelotte P. Wondergem
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Paula J. van der Meer
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Myrèse Witkamp
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Ferdy Lambregtse
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Hyun-Suk Kim
- Center for Genomic Integrity, Institute for Basic Science, 44919Ulsan, Republic of Korea
| | - Folkert Kan
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Katja Apelt
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Angela Kragten
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Román González-Prieto
- Department of Cell and Chemical Biology, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
- Andalusian Center for Molecular Biology and Regenerative Medicine, University of Sevilla, 41092Seville, Spain
- Department of Cell Biology, University of Seville, 41012Seville, Spain
| | - Alfred C. O. Vertegaal
- Department of Cell and Chemical Biology, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
| | - Jung-Eun Yeo
- Center for Genomic Integrity, Institute for Basic Science, 44919Ulsan, Republic of Korea
| | - Byung-Gyu Kim
- Center for Genomic Integrity, Institute for Basic Science, 44919Ulsan, Republic of Korea
| | - Remco van Doorn
- Department of Dermatology, Leiden University Medical Center, 2333 ZALeiden, The Netherlands
| | - Orlando D. Schärer
- Center for Genomic Integrity, Institute for Basic Science, 44919Ulsan, Republic of Korea
- Department of Biological Sciences, Ulsan National Institute of Science and Technology, 44919Ulsan, Republic of Korea
| | - Martijn S. Luijsterburg
- Department of Human Genetics, Leiden University Medical Center, 2333 ZCLeiden, The Netherlands
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27
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Li YL, Langley CA, Azumaya CM, Echeverria I, Chesarino NM, Emerman M, Cheng Y, Gross JD. The structural basis for HIV-1 Vif antagonism of human APOBEC3G. Nature 2023; 615:728-733. [PMID: 36754086 PMCID: PMC10033410 DOI: 10.1038/s41586-023-05779-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 02/02/2023] [Indexed: 02/10/2023]
Abstract
The APOBEC3 (A3) proteins are host antiviral cellular proteins that hypermutate the viral genome of diverse viral families. In retroviruses, this process requires A3 packaging into viral particles1-4. The lentiviruses encode a protein, Vif, that antagonizes A3 family members by targeting them for degradation. Diversification of A3 allows host escape from Vif whereas adaptations in Vif enable cross-species transmission of primate lentiviruses. How this 'molecular arms race' plays out at the structural level is unknown. Here, we report the cryogenic electron microscopy structure of human APOBEC3G (A3G) bound to HIV-1 Vif, and the hijacked cellular proteins that promote ubiquitin-mediated proteolysis. A small surface explains the molecular arms race, including a cross-species transmission event that led to the birth of HIV-1. Unexpectedly, we find that RNA is a molecular glue for the Vif-A3G interaction, enabling Vif to repress A3G by ubiquitin-dependent and -independent mechanisms. Our results suggest a model in which Vif antagonizes A3G by intercepting it in its most dangerous form for the virus-when bound to RNA and on the pathway to packaging-to prevent viral restriction. By engaging essential surfaces required for restriction, Vif exploits a vulnerability in A3G, suggesting a general mechanism by which RNA binding helps to position key residues necessary for viral antagonism of a host antiviral gene.
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Affiliation(s)
- Yen-Li Li
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, USA
| | - Caroline A Langley
- Divisions of Human Biology and Basic Sciences, Fred Hutchinson Cancer Center, Seattle, WA, USA
- Molecular and Cellular Biology Graduate Program, University of Washington, Seattle, WA, USA
| | - Caleigh M Azumaya
- Fred Hutchinson Cancer Center, Electron Microscopy Shared Resource, Seattle, WA, USA
| | - Ignacia Echeverria
- Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA, USA
- Quantitative Bioscience Institute, University of California, San Francisco, CA, USA
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, CA, USA
| | - Nicholas M Chesarino
- Divisions of Human Biology and Basic Sciences, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | - Michael Emerman
- Divisions of Human Biology and Basic Sciences, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | - Yifan Cheng
- Quantitative Bioscience Institute, University of California, San Francisco, CA, USA
- Department of Biochemistry and Biophysics, University of California, San Francisco, CA, USA
- Howard Hughes Medical Institute, University of California, San Francisco, CA, USA
| | - John D Gross
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, USA.
- Quantitative Bioscience Institute, University of California, San Francisco, CA, USA.
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28
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Hinshaw SM, Quan Y, Cai J, Zhou AL, Zhou H. Multi-site phosphorylation of yeast Mif2/CENP-C promotes inner kinetochore assembly. Curr Biol 2023; 33:688-696.e6. [PMID: 36736323 PMCID: PMC9992315 DOI: 10.1016/j.cub.2023.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/28/2022] [Accepted: 01/09/2023] [Indexed: 02/05/2023]
Abstract
Kinetochores control eukaryotic chromosome segregation by connecting chromosomal centromeres to spindle microtubules. Duplication of centromeric DNA necessitates kinetochore disassembly and subsequent reassembly on nascent sisters. To search for a regulatory mechanism that controls the earliest steps of this process, we studied Mif2/CENP-C, an essential basal component of the kinetochore. We found that phosphorylation of a central region of Mif2 (Mif2-PEST) enhances inner kinetochore assembly. Eliminating Mif2-PEST phosphorylation sites progressively impairs cellular fitness. The most severe Mif2-PEST mutations are lethal in cells lacking otherwise non-essential inner kinetochore factors. These data show that multi-site phosphorylation of Mif2/CENP-C controls inner kinetochore assembly.
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Affiliation(s)
- Stephen M Hinshaw
- Stanford Cancer Institute, Stanford School of Medicine, 1291 Welch Road, Stanford, CA 94305, USA.
| | - Yun Quan
- Department of Cellular and Molecular Medicine, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92039, USA
| | - Jiaxi Cai
- Department of Cellular and Molecular Medicine, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92039, USA
| | - Ann L Zhou
- Department of Cellular and Molecular Medicine, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92039, USA
| | - Huilin Zhou
- Department of Cellular and Molecular Medicine, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92039, USA.
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29
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Bralić A, Tehseen M, Sobhy MA, Tsai CL, Alhudhali L, Yi G, Yu J, Yan C, Ivanov I, Tsutakawa SE, Tainer J, Hamdan S. A scanning-to-incision switch in TFIIH-XPG induced by DNA damage licenses nucleotide excision repair. Nucleic Acids Res 2022; 51:1019-1033. [PMID: 36477609 PMCID: PMC9943652 DOI: 10.1093/nar/gkac1095] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/21/2022] [Accepted: 11/26/2022] [Indexed: 12/12/2022] Open
Abstract
Nucleotide excision repair (NER) is critical for removing bulky DNA base lesions and avoiding diseases. NER couples lesion recognition by XPC to strand separation by XPB and XPD ATPases, followed by lesion excision by XPF and XPG nucleases. Here, we describe key regulatory mechanisms and roles of XPG for and beyond its cleavage activity. Strikingly, by combing single-molecule imaging and bulk cleavage assays, we found that XPG binding to the 7-subunit TFIIH core (coreTFIIH) stimulates coreTFIIH-dependent double-strand (ds)DNA unwinding 10-fold, and XPG-dependent DNA cleavage by up to 700-fold. Simultaneous monitoring of rates for coreTFIIH single-stranded (ss)DNA translocation and dsDNA unwinding showed XPG acts by switching ssDNA translocation to dsDNA unwinding as a likely committed step. Pertinent to the NER pathway regulation, XPG incision activity is suppressed during coreTFIIH translocation on DNA but is licensed when coreTFIIH stalls at the lesion or when ATP hydrolysis is blocked. Moreover, ≥15 nucleotides of 5'-ssDNA is a prerequisite for efficient translocation and incision. Our results unveil a paired coordination mechanism in which key lesion scanning and DNA incision steps are sequentially coordinated, and damaged patch removal is only licensed after generation of ≥15 nucleotides of 5'-ssDNA, ensuring the correct ssDNA bubble size before cleavage.
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Affiliation(s)
- Amer Bralić
- Bioscience Program, Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Muhammad Tehseen
- Bioscience Program, Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Mohamed A Sobhy
- Bioscience Program, Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Chi-Lin Tsai
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Lubna Alhudhali
- Bioscience Program, Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Gang Yi
- Bioscience Program, Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Jina Yu
- Department of Chemistry, Georgia State University, Atlanta, GA 30302 USA; Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, 30302, USA
| | - Chunli Yan
- Department of Chemistry, Georgia State University, Atlanta, GA 30302 USA; Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, 30302, USA
| | - Ivaylo Ivanov
- Department of Chemistry, Georgia State University, Atlanta, GA 30302 USA; Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, 30302, USA
| | - Susan E Tsutakawa
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - John A Tainer
- Correspondence may also be addressed to John A. Tainer. Tel: +1 713 563 7725; Fax: +1 713 794 3270;
| | - Samir M Hamdan
- To whom correspondence should be addressed. Tel: +96 628082384; Cell: +96 6544700031;
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30
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Haynes LM, Huttinger ZM, Yee A, Kretz CA, Siemieniak DR, Lawrence DA, Ginsburg D. Deep mutational scanning and massively parallel kinetics of plasminogen activator inhibitor-1 functional stability to probe its latency transition. J Biol Chem 2022; 298:102608. [PMID: 36257408 PMCID: PMC9667310 DOI: 10.1016/j.jbc.2022.102608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 10/10/2022] [Accepted: 10/12/2022] [Indexed: 11/05/2022] Open
Abstract
Plasminogen activator inhibitor-1 (PAI-1), a member of the serine protease inhibitor superfamily of proteins, is unique among serine protease inhibitors for exhibiting a spontaneous conformational change to a latent or inactive state. The functional half-life for this transition at physiologic temperature and pH is ∼1 to 2 h. To better understand the molecular mechanisms underlying this transition, we now report on the analysis of a comprehensive PAI-1 variant library expressed on filamentous phage and selected for functional stability after 48 h at 37 °C. Of the 7201 possible single amino acid substitutions in PAI-1, we identified 439 that increased the functional stability of PAI-1 beyond that of the WT protein. We also found 1549 single amino acid substitutions that retained inhibitory activity toward the canonical target protease of PAI-1 (urokinase-like plasminogen activator), whereas exhibiting functional stability less than or equal to that of WT PAI-1. Missense mutations that increase PAI-1 functional stability are concentrated in highly flexible regions within the PAI-1 structure. Finally, we developed a method for simultaneously measuring the functional half-lives of hundreds of PAI-1 variants in a multiplexed, massively parallel manner, quantifying the functional half-lives for 697 single missense variants of PAI-1 by this approach. Overall, these findings provide novel insight into the mechanisms underlying the latency transition of PAI-1 and provide a database for interpreting human PAI-1 genetic variants.
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Affiliation(s)
- Laura M Haynes
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, USA
| | - Zachary M Huttinger
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, USA; Cellular and Molecular Biology Program, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Andrew Yee
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Colin A Kretz
- Department of Medicine, McMaster University and the Thrombosis and Atherosclerosis Research Institute, Hamilton, Ontario, Canada
| | - David R Siemieniak
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, USA; Howard Hughes Medical Institute
| | - Daniel A Lawrence
- Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA; Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - David Ginsburg
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, USA; Cellular and Molecular Biology Program, University of Michigan Medical School, Ann Arbor, Michigan, USA; Howard Hughes Medical Institute; Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA; Departments of Human Genetics and Pediatrics, University of Michigan, Ann Arbor, Michigan, USA.
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31
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Delhommel F, Martínez-Lumbreras S, Sattler M. Combining NMR, SAXS and SANS to characterize the structure and dynamics of protein complexes. Methods Enzymol 2022; 678:263-297. [PMID: 36641211 DOI: 10.1016/bs.mie.2022.09.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Understanding the structure and dynamics of biological macromolecules is essential to decipher the molecular mechanisms that underlie cellular functions. The description of structure and conformational dynamics often requires the integration of complementary techniques. In this review, we highlight the utility of combining nuclear magnetic resonance (NMR) spectroscopy with small angle scattering (SAS) to characterize these challenging biomolecular systems. NMR can assess the structure and conformational dynamics of multidomain proteins, RNAs and biomolecular complexes. It can efficiently provide information on interaction surfaces, long-distance restraints and relative domain orientations at residue-level resolution. Such information can be readily combined with high-resolution structural data available on subcomponents of biomolecular assemblies. Moreover, NMR is a powerful tool to characterize the dynamics of biomolecules on a wide range of timescales, from nanoseconds to seconds. On the other hand, SAS approaches provide global information on the size and shape of biomolecules and on the ensemble of all conformations present in solution. Therefore, NMR and SAS provide complementary data that are uniquely suited to investigate dynamic biomolecular assemblies. Here, we briefly review the type of data that can be obtained by both techniques and describe different approaches that can be used to combine them to characterize biomolecular assemblies. We then provide guidelines on which experiments are best suited depending on the type of system studied, ranging from fully rigid complexes, dynamic structures that interconvert between defined conformations and systems with very high structural heterogeneity.
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Affiliation(s)
- Florent Delhommel
- Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany; Bavarian NMR Center, Department of Chemistry, Technical University of Munich, Garching, Germany
| | - Santiago Martínez-Lumbreras
- Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany; Bavarian NMR Center, Department of Chemistry, Technical University of Munich, Garching, Germany
| | - Michael Sattler
- Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany; Bavarian NMR Center, Department of Chemistry, Technical University of Munich, Garching, Germany.
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32
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Zukin SA, Marunde MR, Popova IK, Soczek KM, Nogales E, Patel AB. Structure and flexibility of the yeast NuA4 histone acetyltransferase complex. eLife 2022; 11:e81400. [PMID: 36263929 PMCID: PMC9643008 DOI: 10.7554/elife.81400] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 10/17/2022] [Indexed: 11/13/2022] Open
Abstract
The NuA4 protein complex acetylates histones H4 and H2A to activate both transcription and DNA repair. We report the 3.1-Å resolution cryo-electron microscopy structure of the central hub of NuA4, which flexibly tethers the histone acetyltransferase (HAT) and Trimer Independent of NuA4 involved in Transcription Interactions with Nucleosomes (TINTIN) modules. The hub contains the large Tra1 subunit and a core that includes Swc4, Arp4, Act1, Eaf1, and the C-terminal region of Epl1. Eaf1 stands out as the primary scaffolding factor that interacts with the Tra1, Swc4, and Epl1 subunits and contributes the conserved HSA helix to the Arp module. Using nucleosome-binding assays, we find that the HAT module, which is anchored to the core through Epl1, recognizes H3K4me3 nucleosomes with hyperacetylated H3 tails, while the TINTIN module, anchored to the core via Eaf1, recognizes nucleosomes that have hyperacetylated H2A and H4 tails. Together with the known interaction of Tra1 with site-specific transcription factors, our data suggest a model in which Tra1 recruits NuA4 to specific genomic sites then allowing the flexible HAT and TINTIN modules to select nearby nucleosomes for acetylation.
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Affiliation(s)
- Stefan A Zukin
- College of Chemistry, University of California, BerkeleyBerkeleyUnited States
| | | | - Irina K Popova
- EpiCypher, Inc, Research Triangle ParkDurhamUnited States
| | - Katarzyna M Soczek
- California Institute for Quantitative Biology, University of California, BerkeleyBerkeleyUnited States
- Department of Molecular and Cellular Biology, University of CaliforniaBerkeleyUnited States
- Innovative Genomics Institute, University of California, BerkeleyBerkeleyUnited States
| | - Eva Nogales
- California Institute for Quantitative Biology, University of California, BerkeleyBerkeleyUnited States
- Department of Molecular and Cellular Biology, University of CaliforniaBerkeleyUnited States
- Molecular Biophysics and Integrative Bio-Imaging Division, Lawrence Berkeley National LaboratoryBerkeleyUnited States
- Howard Hughes Medical Institute, University of California, BerkeleyBerkeleyUnited States
| | - Avinash B Patel
- California Institute for Quantitative Biology, University of California, BerkeleyBerkeleyUnited States
- Howard Hughes Medical Institute, University of California, BerkeleyBerkeleyUnited States
- Biophysics Graduate Group, University of California, BerkeleyBerkeleyUnited States
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33
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Muckenfuss LM, Migenda Herranz AC, Boneberg FM, Clerici M, Jinek M. Fip1 is a multivalent interaction scaffold for processing factors in human mRNA 3' end biogenesis. eLife 2022; 11:80332. [PMID: 36073787 PMCID: PMC9512404 DOI: 10.7554/elife.80332] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 09/07/2022] [Indexed: 11/25/2022] Open
Abstract
3′ end formation of most eukaryotic mRNAs is dependent on the assembly of a ~1.5 MDa multiprotein complex, that catalyzes the coupled reaction of pre-mRNA cleavage and polyadenylation. In mammals, the cleavage and polyadenylation specificity factor (CPSF) constitutes the core of the 3′ end processing machinery onto which the remaining factors, including cleavage stimulation factor (CstF) and poly(A) polymerase (PAP), assemble. These interactions are mediated by Fip1, a CPSF subunit characterized by high degree of intrinsic disorder. Here, we report two crystal structures revealing the interactions of human Fip1 (hFip1) with CPSF30 and CstF77. We demonstrate that CPSF contains two copies of hFip1, each binding to the zinc finger (ZF) domains 4 and 5 of CPSF30. Using polyadenylation assays we show that the two hFip1 copies are functionally redundant in recruiting one copy of PAP, thereby increasing the processivity of RNA polyadenylation. We further show that the interaction between hFip1 and CstF77 is mediated via a short motif in the N-terminal ‘acidic’ region of hFip1. In turn, CstF77 competitively inhibits CPSF-dependent PAP recruitment and 3′ polyadenylation. Taken together, these results provide a structural basis for the multivalent scaffolding and regulatory functions of hFip1 in 3′ end processing.
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Affiliation(s)
| | | | | | - Marcello Clerici
- Department of Biochemistry, University of Zurich, Zurich, Switzerland
| | - Martin Jinek
- Department of Biochemistry, University of Zurich, Zurich, Switzerland
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34
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Kim M, Kim HS, D’Souza A, Gallagher K, Jeong E, Topolska-Woś A, Ogorodnik Le Meur K, Tsai CL, Tsai MS, Kee M, Tainer JA, Yeo JE, Chazin WJ, Schärer OD. Two interaction surfaces between XPA and RPA organize the preincision complex in nucleotide excision repair. Proc Natl Acad Sci U S A 2022; 119:e2207408119. [PMID: 35969784 PMCID: PMC9407234 DOI: 10.1073/pnas.2207408119] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 07/04/2022] [Indexed: 12/15/2022] Open
Abstract
The xeroderma pigmentosum protein A (XPA) and replication protein A (RPA) proteins fulfill essential roles in the assembly of the preincision complex in the nucleotide excision repair (NER) pathway. We have previously characterized the two interaction sites, one between the XPA N-terminal (XPA-N) disordered domain and the RPA32 C-terminal domain (RPA32C), and the other with the XPA DNA binding domain (DBD) and the RPA70AB DBDs. Here, we show that XPA mutations that inhibit the physical interaction in either site reduce NER activity in biochemical and cellular systems. Combining mutations in the two sites leads to an additive inhibition of NER, implying that they fulfill distinct roles. Our data suggest a model in which the interaction between XPA-N and RPA32C is important for the initial association of XPA with NER complexes, while the interaction between XPA DBD and RPA70AB is needed for structural organization of the complex to license the dual incision reaction. Integrative structural models of complexes of XPA and RPA bound to single-stranded/double-stranded DNA (ss/dsDNA) junction substrates that mimic the NER bubble reveal key features of the architecture of XPA and RPA in the preincision complex. Most critical among these is that the shape of the NER bubble is far from colinear as depicted in current models, but rather the two strands of unwound DNA must assume a U-shape with the two ss/dsDNA junctions localized in close proximity. Our data suggest that the interaction between XPA and RPA70 is key for the organization of the NER preincision complex.
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Affiliation(s)
- Mihyun Kim
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
- Department of Biological Sciences, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
| | - Hyun-Suk Kim
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
| | - Areetha D’Souza
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-7917
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37232-7917
| | - Kaitlyn Gallagher
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-7917
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37232-7917
| | - Eunwoo Jeong
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
| | - Agnieszka Topolska-Woś
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-7917
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37232-7917
| | - Kateryna Ogorodnik Le Meur
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-7917
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37232-7917
| | - Chi-Lin Tsai
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Miaw-Sheue Tsai
- Biological and Systems Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Minyong Kee
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
| | - John A. Tainer
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Jung-Eun Yeo
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
| | - Walter J. Chazin
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-7917
- Center for Structural Biology, Vanderbilt University, Nashville, TN 37232-7917
- Department of Chemistry, Vanderbilt University, Nashville, TN 37232-7917
| | - Orlando D. Schärer
- Center for Genomic Integrity, Institute for Basic Science, Ulsan 44919, Republic of Korea
- Department of Biological Sciences, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-7917
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35
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Remans K, Lebendiker M, Abreu C, Maffei M, Sellathurai S, May MM, Vaněk O, de Marco A. Protein purification strategies must consider downstream applications and individual biological characteristics. Microb Cell Fact 2022; 21:52. [PMID: 35392897 PMCID: PMC8991485 DOI: 10.1186/s12934-022-01778-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 03/21/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Proteins are used as reagents in a broad range of scientific fields. The reliability and reproducibility of experimental data will largely depend on the quality of the (recombinant) proteins and, consequently, these should undergo thorough structural and functional controls. Depending on the downstream application and the biochemical characteristics of the protein, different sets of specific features will need to be checked. RESULTS A number of examples, representative of recurrent issues and previously published strategies, has been reported that illustrate real cases of recombinant protein production in which careful strategy design at the start of the project combined with quality controls throughout the production process was imperative to obtain high-quality samples compatible with the planned downstream applications. Some proteins possess intrinsic properties (e.g., prone to aggregation, rich in cysteines, or a high affinity for nucleic acids) that require certain precautions during the expression and purification process. For other proteins, the downstream application might demand specific conditions, such as for proteins intended for animal use that need to be endotoxin-free. CONCLUSIONS This review has been designed to act as a practical reference list for researchers who wish to produce and evaluate recombinant proteins with certain specific requirements or that need particular care for their preparation and storage.
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Affiliation(s)
- Kim Remans
- European Molecular Biology Laboratory (EMBL), Meyerhofstrasse 1, 69117, Heidelberg, Germany
| | - Mario Lebendiker
- Protein Purification Facility, The Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
| | - Celeste Abreu
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840, Prague, Czech Republic
| | - Mariano Maffei
- Evvivax Biotech, Via di Castel Romano 100, 00128, Rome, Italy
| | | | - Marina M May
- AiCuris Anti-Infective Cures AG, Friedrich-Ebert-Str. 475, 42117, Wuppertal, Germany
| | - Ondřej Vaněk
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840, Prague, Czech Republic
| | - Ario de Marco
- Lab of Environmental and Life Sciences, University of Nova Gorica, Vipavska Cesta 13, 5000, Rožna Dolina-Nova Gorica, Slovenia.
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36
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Kolesnikova O, Zachayus A, Pichard S, Osz J, Rochel N, Rossolillo P, Kolb-Cheynel I, Troffer-Charlier N, Compe E, Bensaude O, Berger I, Poterszman A. HR-Bac, a toolbox based on homologous recombination for expression, screening and production of multiprotein complexes using the baculovirus expression system. Sci Rep 2022; 12:2030. [PMID: 35132103 PMCID: PMC8821708 DOI: 10.1038/s41598-021-04715-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 11/25/2021] [Indexed: 11/09/2022] Open
Abstract
The Baculovirus/insect cell expression system is a powerful technology for reconstitution of eukaryotic macromolecular assemblies. Most multigene expression platforms rely on Tn7-mediated transposition for transferring the expression cassette into the baculoviral genome. This allows a rigorous characterization of recombinant bacmids but involves multiple steps, a limitation when many constructs are to be tested. For parallel expression screening and potential high throughput applications, we have established an open source multigene-expression toolbox exploiting homologous recombination, thus reducing the recombinant baculovirus generation to a single-step procedure and shortening the time from cloning to protein production to 2 weeks. The HR-bac toolbox is composed of a set of engineered bacmids expressing a fluorescent marker to monitor virus propagation and a library of transfer vectors. They contain single or dual expression cassettes bearing different affinity tags and their design facilitates the mix and match utilization of expression units from Multibac constructs. The overall cost of virus generation with HR-bac toolbox is relatively low as the preparation of linearized baculoviral DNA only requires standard reagents. Various multiprotein assemblies (nuclear hormone receptor heterodimers, the P-TEFb or the ternary CAK kinase complex associated with the XPD TFIIH subunit) are used as model systems to validate the toolbox presented.
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Affiliation(s)
- Olga Kolesnikova
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France.,EMBL, Heidelberg, Germany
| | - Amélie Zachayus
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Simon Pichard
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Judit Osz
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Natacha Rochel
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Paola Rossolillo
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Isabelle Kolb-Cheynel
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Nathalie Troffer-Charlier
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Emmanuel Compe
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France.,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France.,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France.,Université de Strasbourg, Illkirch, France
| | - Olivier Bensaude
- Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, PSL Research University, 46 rue d'Ulm, 75005, Paris, France
| | - Imre Berger
- Max Planck Bristol Centre for Minimal Biology, Cantock's Close, University of Bristol, Bristol, BS8 1TS, UK.,Bristol Synthetic Biology Centre BrisSynBio, School of Biochemistry, 1 Tankard's Close, University of Bristol, Bristol, BS8 1TD, UK
| | - Arnaud Poterszman
- Institute of Genetics and of Molecular and Cellular Biology (IGBMC), 1 rue Laurent Fries, Illkirch, France. .,Centre National de la Recherche Scientifique (CNRS), UMR 7104, Illkirch, France. .,Institut National de la Santé et de la Recherche Médicale (Inserm), U964, Illkirch, France. .,Université de Strasbourg, Illkirch, France.
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37
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Rashid I, Tsai MS, Sverzhinsky A, Hlaing AS, Shih B, Thwin AC, Lin JG, Maw SS, Pascal JM, Tomkinson AE. Purification and Characterization of Human DNA Ligase IIIα Complexes After Expression in Insect Cells. Methods Mol Biol 2022; 2444:243-269. [PMID: 35290642 PMCID: PMC9278544 DOI: 10.1007/978-1-0716-2063-2_15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
With improvements in biophysical approaches, there is growing interest in characterizing large, flexible multi-protein complexes. The use of recombinant baculoviruses to express heterologous genes in cultured insect cells has advantages for the expression of human protein complexes because of the ease of co-expressing multiple proteins in insect cells and the presence of a conserved post-translational machinery that introduces many of the same modifications found in human cells. Here we describe the preparation of recombinant baculoviruses expressing DNA ligase IIIα, XRCC1, and TDP1, their subsequent co-expression in cultured insect cells, the purification of complexes containing DNA ligase IIIα from insect cell lysates, and their characterization by multi-angle light scattering linked to size exclusion chromatography and negative stain electron microscopy.
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Affiliation(s)
- Ishtiaque Rashid
- Departments of Internal Medicine, Molecular Genetics and Microbiology and the University of New Mexico Comprehensive Cancer Center, University of New Mexico, Albuquerque, NM, USA
| | - Miaw-Sheue Tsai
- Biological Systems and Engineering Division, Department of BioEngineering & BioMedical Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Aleksandr Sverzhinsky
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montreal, QC, Canada
| | - Aye Su Hlaing
- Biological Systems and Engineering Division, Department of BioEngineering & BioMedical Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Brian Shih
- Biological Systems and Engineering Division, Department of BioEngineering & BioMedical Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Aye C Thwin
- Biological Systems and Engineering Division, Department of BioEngineering & BioMedical Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Judy G Lin
- Biological Systems and Engineering Division, Department of BioEngineering & BioMedical Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Su S Maw
- Biological Systems and Engineering Division, Department of BioEngineering & BioMedical Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - John M Pascal
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montreal, QC, Canada
| | - Alan E Tomkinson
- Departments of Internal Medicine, Molecular Genetics and Microbiology and the University of New Mexico Comprehensive Cancer Center, University of New Mexico, Albuquerque, NM, USA.
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38
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Kroupova A, Ackle F, Asanović I, Weitzer S, Boneberg FM, Faini M, Leitner A, Chui A, Aebersold R, Martinez J, Jinek M. Molecular architecture of the human tRNA ligase complex. eLife 2021; 10:e71656. [PMID: 34854379 PMCID: PMC8668186 DOI: 10.7554/elife.71656] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 12/01/2021] [Indexed: 01/23/2023] Open
Abstract
RtcB enzymes are RNA ligases that play essential roles in tRNA splicing, unfolded protein response, and RNA repair. In metazoa, RtcB functions as part of a five-subunit tRNA ligase complex (tRNA-LC) along with Ddx1, Cgi-99, Fam98B, and Ashwin. The human tRNA-LC or its individual subunits have been implicated in additional cellular processes including microRNA maturation, viral replication, DNA double-strand break repair, and mRNA transport. Here, we present a biochemical analysis of the inter-subunit interactions within the human tRNA-LC along with crystal structures of the catalytic subunit RTCB and the N-terminal domain of CGI-99. We show that the core of the human tRNA-LC is assembled from RTCB and the C-terminal alpha-helical regions of DDX1, CGI-99, and FAM98B, all of which are required for complex integrity. The N-terminal domain of CGI-99 displays structural homology to calponin-homology domains, and CGI-99 and FAM98B associate via their N-terminal domains to form a stable subcomplex. The crystal structure of GMP-bound RTCB reveals divalent metal coordination geometry in the active site, providing insights into its catalytic mechanism. Collectively, these findings shed light on the molecular architecture and mechanism of the human tRNA ligase complex and provide a structural framework for understanding its functions in cellular RNA metabolism.
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Affiliation(s)
- Alena Kroupova
- Department of Biochemistry, University of ZurichZurichSwitzerland
| | - Fabian Ackle
- Department of Biochemistry, University of ZurichZurichSwitzerland
| | - Igor Asanović
- Max Perutz Labs, Vienna BioCenter (VBC)ViennaAustria
| | | | | | - Marco Faini
- Department of Biology, Institute of Molecular Systems Biology, ETH ZurichZurichSwitzerland
| | - Alexander Leitner
- Department of Biology, Institute of Molecular Systems Biology, ETH ZurichZurichSwitzerland
| | - Alessia Chui
- Department of Biochemistry, University of ZurichZurichSwitzerland
| | - Ruedi Aebersold
- Department of Biology, Institute of Molecular Systems Biology, ETH ZurichZurichSwitzerland
| | | | - Martin Jinek
- Department of Biochemistry, University of ZurichZurichSwitzerland
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39
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Fianu I, Chen Y, Dienemann C, Dybkov O, Linden A, Urlaub H, Cramer P. Structural basis of Integrator-mediated transcription regulation. Science 2021; 374:883-887. [PMID: 34762484 DOI: 10.1126/science.abk0154] [Citation(s) in RCA: 78] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Isaac Fianu
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Ying Chen
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Christian Dienemann
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Olexandr Dybkov
- Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Andreas Linden
- Bioanalytical Mass Spectrometry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany.,Institute of Clinical Chemistry, Bioanalytics Group, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany.,Institute of Clinical Chemistry, Bioanalytics Group, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Patrick Cramer
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
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40
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Grose C, Putman Z, Esposito D. A review of alternative promoters for optimal recombinant protein expression in baculovirus-infected insect cells. Protein Expr Purif 2021; 186:105924. [PMID: 34087362 PMCID: PMC8266756 DOI: 10.1016/j.pep.2021.105924] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 05/24/2021] [Accepted: 05/25/2021] [Indexed: 12/18/2022]
Abstract
Generating recombinant proteins in insect cells has been made possible via the use of the Baculovirus Expression Vector System (BEVS). Despite the success of many proteins via this platform, some targets remain a challenge due to issues such as cytopathic effects, the unpredictable nature of co-infection and co-expressions, and baculovirus genome instability. Many promoters have been assayed for the purpose of expressing diverse proteins in insect cells, and yet there remains a lack of implementation of those results when reviewing the landscape of commercially available baculovirus vectors. In advancing the platform to produce a greater variety of proteins and complexes, the development of such constructs cannot be avoided. A better understanding of viral gene regulation and promoter options including viral, synthetic, and insect-derived promoters will be beneficial to researchers looking to utilize BEVS by recruiting these intricate mechanisms of gene regulation for heterologous gene expression. Here we summarize some of the developments that could be utilized to improve the expression of recombinant proteins and multi-protein complexes in insect cells.
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Affiliation(s)
- Carissa Grose
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA.
| | - Zoe Putman
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
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41
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Abstract
Transcription-coupled DNA repair removes bulky DNA lesions from the genome1,2 and protects cells against ultraviolet (UV) irradiation3. Transcription-coupled DNA repair begins when RNA polymerase II (Pol II) stalls at a DNA lesion and recruits the Cockayne syndrome protein CSB, the E3 ubiquitin ligase, CRL4CSA and UV-stimulated scaffold protein A (UVSSA)3. Here we provide five high-resolution structures of Pol II transcription complexes containing human transcription-coupled DNA repair factors and the elongation factors PAF1 complex (PAF) and SPT6. Together with biochemical and published3,4 data, the structures provide a model for transcription–repair coupling. Stalling of Pol II at a DNA lesion triggers replacement of the elongation factor DSIF by CSB, which binds to PAF and moves upstream DNA to SPT6. The resulting elongation complex, ECTCR, uses the CSA-stimulated translocase activity of CSB to pull on upstream DNA and push Pol II forward. If the lesion cannot be bypassed, CRL4CSA spans over the Pol II clamp and ubiquitylates the RPB1 residue K1268, enabling recruitment of TFIIH to UVSSA and DNA repair. Conformational changes in CRL4CSA lead to ubiquitylation of CSB and to release of transcription-coupled DNA repair factors before transcription may continue over repaired DNA. The authors resolve the structure of five complexes containing RNA polymerase II and the CSA and CSB proteins, offering insight into how the repair of DNA lesions is coupled to transcription.
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42
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Tomko EJ, Luyties O, Rimel JK, Tsai CL, Fuss JO, Fishburn J, Hahn S, Tsutakawa SE, Taatjes DJ, Galburt EA. The Role of XPB/Ssl2 dsDNA Translocase Processivity in Transcription Start-site Scanning. J Mol Biol 2021; 433:166813. [PMID: 33453189 PMCID: PMC8327364 DOI: 10.1016/j.jmb.2021.166813] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 12/28/2020] [Accepted: 01/04/2021] [Indexed: 12/12/2022]
Abstract
The general transcription factor TFIIH contains three ATP-dependent catalytic activities. TFIIH functions in nucleotide excision repair primarily as a DNA helicase and in Pol II transcription initiation as a dsDNA translocase and protein kinase. During initiation, the XPB/Ssl2 subunit of TFIIH couples ATP hydrolysis to dsDNA translocation facilitating promoter opening and the kinase module phosphorylates Pol II to facilitate the transition to elongation. These functions are conserved between metazoans and yeast; however, yeast TFIIH also drives transcription start-site scanning in which Pol II scans downstream DNA to locate productive start-sites. The ten-subunit holo-TFIIH from S. cerevisiae has a processive dsDNA translocase activity required for scanning and a structural role in scanning has been ascribed to the three-subunit TFIIH kinase module. Here, we assess the dsDNA translocase activity of ten-subunit holo- and core-TFIIH complexes (i.e. seven subunits, lacking the kinase module) from both S. cerevisiae and H. sapiens. We find that neither holo nor core human TFIIH exhibit processive translocation, consistent with the lack of start-site scanning in humans. Furthermore, in contrast to holo-TFIIH, the S. cerevisiae core-TFIIH also lacks processive translocation and its dsDNA-stimulated ATPase activity was reduced ~5-fold to a level comparable to the human complexes, potentially explaining the reported upstream shift in start-site observed in vitro in the absence of the S. cerevisiae kinase module. These results suggest that neither human nor S. cerevisiae core-TFIIH can translocate efficiently, and that the S. cerevisiae kinase module functions as a processivity factor to allow for robust transcription start-site scanning.
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Affiliation(s)
- Eric J Tomko
- Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Olivia Luyties
- Dept. of Biochemistry, University of Colorado, Boulder, CO 80303, USA
| | - Jenna K Rimel
- Dept. of Biochemistry, University of Colorado, Boulder, CO 80303, USA
| | - Chi-Lin Tsai
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Jill O Fuss
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - James Fishburn
- Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Steven Hahn
- Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Susan E Tsutakawa
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Dylan J Taatjes
- Dept. of Biochemistry, University of Colorado, Boulder, CO 80303, USA
| | - Eric A Galburt
- Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110, USA.
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43
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Fianu I, Dienemann C, Aibara S, Schilbach S, Cramer P. Cryo-EM structure of mammalian RNA polymerase II in complex with human RPAP2. Commun Biol 2021; 4:606. [PMID: 34021257 PMCID: PMC8140126 DOI: 10.1038/s42003-021-02088-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 04/08/2021] [Indexed: 11/09/2022] Open
Abstract
Nuclear import of RNA polymerase II (Pol II) involves the conserved factor RPAP2. Here we report the cryo-electron microscopy (cryo-EM) structure of mammalian Pol II in complex with human RPAP2 at 2.8 Å resolution. The structure shows that RPAP2 binds between the jaw domains of the polymerase subunits RPB1 and RPB5. RPAP2 is incompatible with binding of downstream DNA during transcription and is displaced upon formation of a transcription pre-initiation complex.
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Affiliation(s)
- Isaac Fianu
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Christian Dienemann
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Shintaro Aibara
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Sandra Schilbach
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Patrick Cramer
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
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44
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Asanović I, Strandback E, Kroupova A, Pasajlic D, Meinhart A, Tsung-Pin P, Djokovic N, Anrather D, Schuetz T, Suskiewicz MJ, Sillamaa S, Köcher T, Beveridge R, Nikolic K, Schleiffer A, Jinek M, Hartl M, Clausen T, Penninger J, Macheroux P, Weitzer S, Martinez J. The oxidoreductase PYROXD1 uses NAD(P) + as an antioxidant to sustain tRNA ligase activity in pre-tRNA splicing and unfolded protein response. Mol Cell 2021; 81:2520-2532.e16. [PMID: 33930333 DOI: 10.1016/j.molcel.2021.04.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 02/09/2021] [Accepted: 04/09/2021] [Indexed: 12/19/2022]
Abstract
The tRNA ligase complex (tRNA-LC) splices precursor tRNAs (pre-tRNA), and Xbp1-mRNA during the unfolded protein response (UPR). In aerobic conditions, a cysteine residue bound to two metal ions in its ancient, catalytic subunit RTCB could make the tRNA-LC susceptible to oxidative inactivation. Here, we confirm this hypothesis and reveal a co-evolutionary association between the tRNA-LC and PYROXD1, a conserved and essential oxidoreductase. We reveal that PYROXD1 preserves the activity of the mammalian tRNA-LC in pre-tRNA splicing and UPR. PYROXD1 binds the tRNA-LC in the presence of NAD(P)H and converts RTCB-bound NAD(P)H into NAD(P)+, a typical oxidative co-enzyme. However, NAD(P)+ here acts as an antioxidant and protects the tRNA-LC from oxidative inactivation, which is dependent on copper ions. Genetic variants of PYROXD1 that cause human myopathies only partially support tRNA-LC activity. Thus, we establish the tRNA-LC as an oxidation-sensitive metalloenzyme, safeguarded by the flavoprotein PYROXD1 through an unexpected redox mechanism.
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Affiliation(s)
- Igor Asanović
- Max Perutz Labs, Medical University of Vienna, Vienna BioCenter (VBC), Dr. Bohr-Gasse 9/2, 1030 Vienna, Austria
| | - Emilia Strandback
- Institute of Biochemistry, Graz University of Technology, Petersgasse 12/2, 8010 Graz, Austria; Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Alena Kroupova
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Djurdja Pasajlic
- Max Perutz Labs, Medical University of Vienna, Vienna BioCenter (VBC), Dr. Bohr-Gasse 9/2, 1030 Vienna, Austria
| | - Anton Meinhart
- Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Campus-Vienna-BioCenter 1, 1030 Vienna, Austria
| | - Pai Tsung-Pin
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna BioCenter (VBC), Dr. Bohr-Gasse 3, 1030 Vienna, Austria; AnnJi Pharmaceutical, Taipei, Taiwan
| | - Nemanja Djokovic
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Dorothea Anrather
- Max Perutz Labs, University of Vienna, Vienna BioCenter (VBC), Dr. Bohr-Gasse 9, 1030 Vienna, Austria
| | - Thomas Schuetz
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna BioCenter (VBC), Dr. Bohr-Gasse 3, 1030 Vienna, Austria; Department of Internal Medicine III (Cardiology and Angiology), Medical University of Innsbruck, Anichstraße 35, 6020 Innsbruck, Austria
| | - Marcin Józef Suskiewicz
- Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Campus-Vienna-BioCenter 1, 1030 Vienna, Austria; Sir William Dunn School of Pathology, University of Oxford, South Parks Road, OX1 3RE Oxford, UK
| | - Sirelin Sillamaa
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia
| | - Thomas Köcher
- Vienna BioCenter Core Facilities, Campus-Vienna-BioCenter 1, 1030 Vienna, Austria
| | - Rebecca Beveridge
- Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Campus-Vienna-BioCenter 1, 1030 Vienna, Austria; Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, G1 1XL Glasgow, UK
| | - Katarina Nikolic
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Alexander Schleiffer
- Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Campus-Vienna-BioCenter 1, 1030 Vienna, Austria; Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna BioCenter (VBC), Dr. Bohr-Gasse 3, 1030 Vienna, Austria
| | - Martin Jinek
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Markus Hartl
- Max Perutz Labs, University of Vienna, Vienna BioCenter (VBC), Dr. Bohr-Gasse 9, 1030 Vienna, Austria
| | - Tim Clausen
- Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Campus-Vienna-BioCenter 1, 1030 Vienna, Austria
| | - Josef Penninger
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna BioCenter (VBC), Dr. Bohr-Gasse 3, 1030 Vienna, Austria; Department of Medical Genetics, Life Science Institute, University of British Columbia, C201 - 4500 Oak Street, V6H 3N1 Vancouver, BC, Canada
| | - Peter Macheroux
- Institute of Biochemistry, Graz University of Technology, Petersgasse 12/2, 8010 Graz, Austria
| | - Stefan Weitzer
- Max Perutz Labs, Medical University of Vienna, Vienna BioCenter (VBC), Dr. Bohr-Gasse 9/2, 1030 Vienna, Austria.
| | - Javier Martinez
- Max Perutz Labs, Medical University of Vienna, Vienna BioCenter (VBC), Dr. Bohr-Gasse 9/2, 1030 Vienna, Austria.
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45
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Aibara S, Schilbach S, Cramer P. Structures of mammalian RNA polymerase II pre-initiation complexes. Nature 2021; 594:124-128. [DOI: 10.1038/s41586-021-03554-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 04/14/2021] [Indexed: 01/24/2023]
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46
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Structure of the human Mediator–RNA polymerase II pre-initiation complex. Nature 2021; 594:129-133. [DOI: 10.1038/s41586-021-03555-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 04/14/2021] [Indexed: 12/25/2022]
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47
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Kasinath V, Beck C, Sauer P, Poepsel S, Kosmatka J, Faini M, Toso D, Aebersold R, Nogales E. JARID2 and AEBP2 regulate PRC2 in the presence of H2AK119ub1 and other histone modifications. Science 2021; 371:371/6527/eabc3393. [PMID: 33479123 DOI: 10.1126/science.abc3393] [Citation(s) in RCA: 126] [Impact Index Per Article: 42.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 11/16/2020] [Indexed: 12/14/2022]
Abstract
Polycomb repressive complexes 1 and 2 (PRC1 and PRC2) cooperate to determine cell identity by epigenetic gene expression regulation. However, the mechanism of PRC2 recruitment by means of recognition of PRC1-mediated H2AK119ub1 remains poorly understood. Our PRC2 cryo-electron microscopy structure with cofactors JARID2 and AEBP2 bound to a H2AK119ub1-containing nucleosome reveals a bridge helix in EZH2 that connects the SET domain, H3 tail, and nucleosomal DNA. JARID2 and AEBP2 each interact with one ubiquitin and the H2A-H2B surface. JARID2 stimulates PRC2 through interactions with both the polycomb protein EED and the H2AK119-ubiquitin, whereas AEBP2 has an additional scaffolding role. The presence of these cofactors partially overcomes the inhibitory effect that H3K4me3 and H3K36me3 exert on core PRC2 (in the absence of cofactors). Our results support a key role for JARID2 and AEBP2 in the cross-talk between histone modifications and PRC2 activity.
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Affiliation(s)
- Vignesh Kasinath
- QB3 Institute, Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA.
| | - Curtis Beck
- Department of Molecular and Cellular Biology, University of California, Berkeley, CA, USA
| | - Paul Sauer
- QB3 Institute, Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA.,Howard Hughes Medical Institute, University of California, Berkeley, CA, USA
| | - Simon Poepsel
- University of Cologne, Center for Molecular Medicine Cologne (CMMC), Faculty of Medicine and University Hospital, Cologne, Germany.,Cologne Excellence Cluster for Cellular Stress Responses in Ageing-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Jennifer Kosmatka
- Department of Molecular and Cellular Biology, University of California, Berkeley, CA, USA
| | - Marco Faini
- Department of Biology, Institute of Molecular Systems Biology, ETH Zürich, Zürich, Switzerland
| | - Daniel Toso
- QB3 Institute, Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA
| | - Ruedi Aebersold
- Department of Biology, Institute of Molecular Systems Biology, ETH Zürich, Zürich, Switzerland.,Faculty of Science, University of Zürich, Zürich, Switzerland
| | - Eva Nogales
- QB3 Institute, Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA. .,Department of Molecular and Cellular Biology, University of California, Berkeley, CA, USA.,Howard Hughes Medical Institute, University of California, Berkeley, CA, USA.,Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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48
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Raducanu V, Raducanu D, Ouyang Y, Tehseen M, Takahashi M, Hamdan SM. TSGIT: An N- and C-terminal tandem tag system for purification of native and intein-mediated ligation-ready proteins. Protein Sci 2021; 30:497-512. [PMID: 33150985 PMCID: PMC7784762 DOI: 10.1002/pro.3989] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 10/30/2020] [Accepted: 10/30/2020] [Indexed: 11/26/2022]
Abstract
A large variety of fusion tags have been developed to improve protein expression, solubilization, and purification. Nevertheless, these tags have been combined in a rather limited number of composite tags and usually these composite tags have been dictated by traditional commercially-available expression vectors. Moreover, most commercially-available expression vectors include either N- or C-terminal fusion tags but not both. Here, we introduce TSGIT, a fusion-tag system composed of both N- and a C-terminal composite fusion tags. The system includes two affinity tags, two solubilization tags and two cleavable tags distributed at both termini of the protein of interest. Therefore, the N- and the C-terminal composite fusion tags in TSGIT are fully orthogonal in terms of both affinity selection and cleavage. For using TSGIT, we streamlined the cloning, expression, and purification procedures. Each component tag is selected to maximize its benefits toward the final construct. By expressing and partially purifying the protein of interest between the components of the TSGIT fusion, the full-length protein is selected over truncated forms, which has been a long-standing problem in protein purification. Moreover, due to the nature of the cleavable tags in TSGIT, the protein of interest is obtained in its native form without any additional undesired N- or C-terminal amino acids. Finally, the resulting purified protein is ready for efficient ligation with other proteins or peptides for downstream applications. We demonstrate the use of this system by purifying a large amount of native fluorescent mRuby3 protein and bacteriophage T7 gp2.5 ssDNA-binding protein.
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Affiliation(s)
- Vlad‐Stefan Raducanu
- Division of Biological and Environmental Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia
| | - Daniela‐Violeta Raducanu
- Division of Biological and Environmental Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia
| | - Yujing Ouyang
- Division of Biological and Environmental Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia
| | - Muhammad Tehseen
- Division of Biological and Environmental Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia
| | - Masateru Takahashi
- Division of Biological and Environmental Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia
| | - Samir M. Hamdan
- Division of Biological and Environmental Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia
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49
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Osman S, Mohammad E, Lidschreiber M, Stuetzer A, Bazsó FL, Maier KC, Urlaub H, Cramer P. The Cdk8 kinase module regulates interaction of the mediator complex with RNA polymerase II. J Biol Chem 2021; 296:100734. [PMID: 33933450 PMCID: PMC8191332 DOI: 10.1016/j.jbc.2021.100734] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 04/20/2021] [Accepted: 04/28/2021] [Indexed: 11/17/2022] Open
Abstract
The Cdk8 kinase module (CKM) is a dissociable part of the coactivator complex mediator, which regulates gene transcription by RNA polymerase II. The CKM has both negative and positive functions in gene transcription that remain poorly understood at the mechanistic level. In order to reconstitute the role of the CKM in transcription initiation, we prepared recombinant CKM from the yeast Saccharomyces cerevisiae. We showed that CKM bound to the core mediator (cMed) complex, sterically inhibiting cMed from binding to the polymerase II preinitiation complex (PIC) in vitro. We further showed that the Cdk8 kinase activity of the CKM weakened CKM-cMed interaction, thereby facilitating dissociation of the CKM and enabling mediator to bind the PIC in order to stimulate transcription initiation. Finally, we report that the kinase activity of Cdk8 is required for gene activation during the stressful condition of heat shock in vivo but not under steady-state growth conditions. Based on these results, we propose a model in which the CKM negatively regulates mediator function at upstream-activating sequences by preventing mediator binding to the PIC at the gene promoter. However, during gene activation in response to stress, the Cdk8 kinase activity of the CKM may release mediator and allow its binding to the PIC, thereby accounting for the positive function of CKM. This may impart improved adaptability to stress by allowing a rapid transcriptional response to environmental changes, and we speculate that a similar mechanism in metazoans may allow the precise timing of developmental transcription programs.
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Affiliation(s)
- Sara Osman
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Eusra Mohammad
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Michael Lidschreiber
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Alexandra Stuetzer
- Bioanalytical Mass Spectrometry Group, Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany; Bioanalytics Research Group, Institute for Clinical Chemistry, University Medical Center, Göttingen, Germany
| | - Fanni Laura Bazsó
- Bioanalytical Mass Spectrometry Group, Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany; Bioanalytics Research Group, Institute for Clinical Chemistry, University Medical Center, Göttingen, Germany
| | - Kerstin C Maier
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry Group, Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany; Bioanalytics Research Group, Institute for Clinical Chemistry, University Medical Center, Göttingen, Germany
| | - Patrick Cramer
- Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
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50
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He F, DuPrez K, Hilario E, Chen Z, Fan L. Structural basis of the XPB helicase-Bax1 nuclease complex interacting with the repair bubble DNA. Nucleic Acids Res 2020; 48:11695-11705. [PMID: 32986831 PMCID: PMC7672443 DOI: 10.1093/nar/gkaa801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 08/18/2020] [Accepted: 09/15/2020] [Indexed: 12/15/2022] Open
Abstract
Nucleotide excision repair (NER) removes various DNA lesions caused by UV light and chemical carcinogens. The DNA helicase XPB plays a key role in DNA opening and coordinating damage incision by nucleases during NER, but the underlying mechanisms remain unclear. Here, we report crystal structures of XPB from Sulfurisphaera tokodaii (St) bound to the nuclease Bax1 and their complex with a bubble DNA having one arm unwound in the crystal. StXPB and Bax1 together spirally encircle 10 base pairs of duplex DNA at the double-/single-stranded (ds–ss) junction. Furthermore, StXPB has its ThM motif intruding between the two DNA strands and gripping the 3′-overhang while Bax1 interacts with the 5′-overhang. This ternary complex likely reflects the state of repair bubble extension by the XPB and nuclease machine. ATP binding and hydrolysis by StXPB could lead to a spiral translocation along dsDNA and DNA strand separation by the ThM motif, revealing an unconventional DNA unwinding mechanism. Interestingly, the DNA is kept away from the nuclease domain of Bax1, potentially preventing DNA incision by Bax1 during repair bubble extension.
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Affiliation(s)
- Feng He
- Department of Biochemistry, University of California, Riverside, CA 92521, USA
| | - Kevin DuPrez
- Department of Biochemistry, University of California, Riverside, CA 92521, USA
| | - Eduardo Hilario
- Department of Biochemistry, University of California, Riverside, CA 92521, USA
| | - Zhenhang Chen
- Department of Biochemistry, University of California, Riverside, CA 92521, USA
| | - Li Fan
- Department of Biochemistry, University of California, Riverside, CA 92521, USA
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