1
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Xiong F, Ren JJ, Wang YY, Zhou Z, Qi HD, Otegui MS, Wang XL. An Arabidopsis Retention and Splicing complex regulates root and embryo development through pre-mRNA splicing. PLANT PHYSIOLOGY 2022; 190:621-639. [PMID: 35640107 PMCID: PMC9434225 DOI: 10.1093/plphys/kiac256] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 05/08/2022] [Indexed: 05/30/2023]
Abstract
Pre-mRNA splicing is an important step in the posttranscriptional processing of transcripts and a key regulator of development. The heterotrimeric retention and splicing (RES) complex plays vital roles in the growth and development of yeast, zebrafish, and humans by mediating pre-mRNA splicing of multiple genes. However, whether the RES complex is conserved in plants and what specific functions it has remain unknown. In this study, we identified Arabidopsis (Arabidopsis thaliana) BUD13 (AtBUD13), GROWTH, DEVELOPMENT AND SPLICING 1 (GDS1), and DAWDLE (DDL) as the counterparts of the yeast RES complex subunits Bud site selection protein 13 (Bud13), U2 snRNP component Snu17 (Snu17), and Pre-mRNA leakage protein 1, respectively. Moreover, we showed that RES is an ancient complex evolutionarily conserved in eukaryotes. GDS1 directly interacts with both AtBUD13 and DDL in nuclear speckles. The BUD13 domain of AtBUD13 and the RNA recognition motif domain of GDS1 are necessary and sufficient for AtBUD13-GDS1 interaction. Mutants of AtBUD13, GDS1, and DDL failed to properly splice multiple genes involved in cell proliferation and showed defects in early embryogenesis and root development. In addition, we found that GDS1 and DDL interact, respectively, with the U2 small nuclear ribonucleoproteins auxiliary factor AtU2AF65B and the NineTeen Complex-related splicing factor SKIP, which are essential for early steps of spliceosome assembly and recognition of splice sites. Altogether, our work reveals that the Arabidopsis RES complex is important for root and early embryo development by modulating pre-mRNA splicing.
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Affiliation(s)
- Feng Xiong
- National Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian 271018, China
| | - Jing-Jing Ren
- National Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian 271018, China
| | - Yu-Yi Wang
- National Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian 271018, China
| | - Zhou Zhou
- National Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian 271018, China
| | - Hao-Dong Qi
- National Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian 271018, China
| | - Marisa S Otegui
- Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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2
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Bao P, Will CL, Urlaub H, Boon KL, Lührmann R. The RES complex is required for efficient transformation of the precatalytic B spliceosome into an activated B act complex. Genes Dev 2018; 31:2416-2429. [PMID: 29330354 PMCID: PMC5795787 DOI: 10.1101/gad.308163.117] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 12/11/2017] [Indexed: 12/31/2022]
Abstract
The precise function of the trimeric retention and splicing (RES) complex in pre-mRNA splicing remains unclear. Here we dissected the role of RES during the assembly and activation of yeast spliceosomes. The efficiency of pre-mRNA splicing was significantly lower in the absence of the RES protein Snu17, and the recruitment of its binding partners, Pml1 (pre-mRNA leakage protein 1) and Bud13 (bud site selection protein 13), to the spliceosome was either abolished or substantially reduced. RES was not required for the assembly of spliceosomal B complexes, but its absence hindered efficient Bact complex formation. ΔRES spliceosomes were no longer strictly dependent on Prp2 activity for their catalytic activation, suggesting that they are structurally compromised. Addition of Prp2, Spp2, and UTP to affinity-purified ΔRES B or a mixture of B/Bact complexes formed on wild-type pre-mRNA led to their disassembly. However, no substantial disassembly was observed with ΔRES spliceosomes formed on a truncated pre-mRNA that allows Prp2 binding but blocks its activity. Thus, in the absence of RES, Prp2 appears to bind prematurely, leading to the disassembly of the ΔRES B complexes to which it binds. Our data suggest that Prp2 can dismantle B complexes with an aberrant protein composition, suggesting that it may proofread the spliceosome's RNP structure prior to activation.
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Affiliation(s)
- Penghui Bao
- Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
| | - Cindy L Will
- Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry Group, Max Planck Institute for Biophysical Chemistry, D-37077 Göttingen, Germany.,Bioanalytics Group, Institute for Clinical Chemistry, University Medical Center Göttingen, D-37075 Göttingen, Germany
| | - Kum-Loong Boon
- Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
| | - Reinhard Lührmann
- Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
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3
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Zhou Y, Johansson MJO. The pre-mRNA retention and splicing complex controls expression of the Mediator subunit Med20. RNA Biol 2017; 14:1411-1417. [PMID: 28277935 PMCID: PMC5711472 DOI: 10.1080/15476286.2017.1294310] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
The heterotrimeric pre-mRNA retention and splicing (RES) complex, consisting of Bud13p, Snu17p and Pml1p, promotes splicing and nuclear retention of a subset of intron-containing pre-mRNAs. Yeast cells deleted for individual RES genes show growth defects that are exacerbated at elevated temperatures. Although the growth phenotypes correlate to the splicing defects in the individual mutants, the underlying mechanism is unknown. Here, we show that the temperature sensitive (Ts) growth phenotype of bud13Δ and snu17Δ cells is a consequence of inefficient splicing of MED20 pre-mRNA, which codes for a subunit of the Mediator complex; a co-regulator of RNA polymerase II transcription. The MED20 pre-mRNA splicing defect is less pronounced in pml1Δ cells, explaining why they grow better than the other 2 RES mutants at elevated temperatures. Inactivation of the cytoplasmic nonsense-mediated mRNA decay (NMD) pathway in the RES mutants leads to accumulation of MED20 pre-mRNA, indicating that inefficient nuclear retention contributes to the growth defect. Further, the Ts phenotype of bud13Δ and snu17Δ cells is partially suppressed by the inactivation of NMD, showing that the growth defects are augmented by the presence of a functional NMD pathway. Collectively, our results demonstrate an important role of the RES complex in maintaining the Med20p levels.
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Affiliation(s)
- Yang Zhou
- a Department of Molecular Biology , Umeå University , Umeå , Sweden
| | - Marcus J O Johansson
- a Department of Molecular Biology , Umeå University , Umeå , Sweden.,b BRF Krutet , Norra Majorsgatan, Umeå , Sweden.,c University of Tartu, Institute of Technology , Nooruse, Tartu , Estonia
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4
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Rauhut R, Fabrizio P, Dybkov O, Hartmuth K, Pena V, Chari A, Kumar V, Lee CT, Urlaub H, Kastner B, Stark H, Lührmann R. Molecular architecture of the Saccharomyces cerevisiae activated spliceosome. Science 2016; 353:1399-1405. [PMID: 27562955 DOI: 10.1126/science.aag1906] [Citation(s) in RCA: 139] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 08/18/2016] [Indexed: 12/30/2022]
Abstract
The activated spliceosome (Bact) is in a catalytically inactive state and is remodeled into a catalytically active machine by the RNA helicase Prp2, but the mechanism is unclear. Here, we describe a 3D electron cryomicroscopy structure of the Saccharomyces cerevisiae Bact complex at 5.8-angstrom resolution. Our model reveals that in Bact, the catalytic U2/U6 RNA-Prp8 ribonucleoprotein core is already established, and the 5' splice site (ss) is oriented for step 1 catalysis but occluded by protein. The first-step nucleophile-the branchsite adenosine-is sequestered within the Hsh155 HEAT domain and is held 50 angstroms away from the 5'ss. Our structure suggests that Prp2 adenosine triphosphatase-mediated remodeling leads to conformational changes in Hsh155's HEAT domain that liberate the first-step reactants for catalysis.
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Affiliation(s)
- Reinhard Rauhut
- Department of Cellular Biochemistry, Max Planck Institute (MPI) for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Patrizia Fabrizio
- Department of Cellular Biochemistry, Max Planck Institute (MPI) for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Olexandr Dybkov
- Department of Cellular Biochemistry, Max Planck Institute (MPI) for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Klaus Hartmuth
- Department of Cellular Biochemistry, Max Planck Institute (MPI) for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Vladimir Pena
- Research Group Macromolecular Crystallography, MPI for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Ashwin Chari
- 3D Electron Cryomicroscopy Group, MPI for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Vinay Kumar
- Department of Cellular Biochemistry, Max Planck Institute (MPI) for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Chung-Tien Lee
- Bioanalytical Mass Spectrometry, MPI for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany. Bioanalytics Group, Institute for Clinical Chemistry, University Medical Center, Göttingen, Robert-Koch-Straße 40, D-37075 Göttingen, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry, MPI for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany. Bioanalytics Group, Institute for Clinical Chemistry, University Medical Center, Göttingen, Robert-Koch-Straße 40, D-37075 Göttingen, Germany
| | - Berthold Kastner
- Department of Cellular Biochemistry, Max Planck Institute (MPI) for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany.
| | - Holger Stark
- 3D Electron Cryomicroscopy Group, MPI for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany. Department of 3D Electron Cryomicroscopy, Georg-August Universität, Göttingen, Justus von-Liebig-Weg 11, D-37077 Germany.
| | - Reinhard Lührmann
- Department of Cellular Biochemistry, Max Planck Institute (MPI) for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany.
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Abstract
One of the great challenges to structural biologists lies in explaining the complexities of the spliceosome – a ribosome-sized molecular machine that is assembled in a step-wise manner and is responsible for pre-mRNA splicing. The spliceosome is both fascinating and difficult to work with, because of its dynamic nature. At each discrete step of splicing tens of proteins come and go orchestrating the functional transition through massive structural rearrangements. The retention and splicing complex (RES) is an important splicing factor interacting with pre-mRNA at the onset of the first transesterification reaction. RES is a specific splicing factor for a number of genes and is important for controlling pre-mRNA retention in the nucleus. RES is a 71 kDa heterotrimer composed of the 3 proteins Pml1p, Bud13p and Snu17p. We solved the 3-dimensional structure of the core of the RES complex as well as the 2 dimers, Snu17p-Bud13p and Snu17p-Pml1p. Further biophysical analysis revealed an astounding cooperativity that governs the assembly of this trimeric complex as well as its interaction with pre-mRNA. The more than 100-fold cooperativity originates from the progressive rigidification of Snu17p upon coupled binding-and-folding of protein regions, which are disordered in the unbound state. Our work highlights the role of cooperativity in the spliceosome and poses new questions about the structure and assembly of the spliceosome.
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Affiliation(s)
- Piotr Wysoczanski
- a Department for NMR-based Structural Biology ; Max Planck Institute for Biophysical Chemistry ; Am Fassberg 11, Göttingen , Germany
| | - Markus Zweckstetter
- a Department for NMR-based Structural Biology ; Max Planck Institute for Biophysical Chemistry ; Am Fassberg 11, Göttingen , Germany.,b German Center for Neurodegenerative Diseases (DZNE) ; Göttingen , Germany.,c Center for Nanoscale Microscopy and Molecular Physiology of the Brain; University Medical Center ; Göttingen , Germany
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6
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Schneider C, Agafonov DE, Schmitzová J, Hartmuth K, Fabrizio P, Lührmann R. Dynamic Contacts of U2, RES, Cwc25, Prp8 and Prp45 Proteins with the Pre-mRNA Branch-Site and 3' Splice Site during Catalytic Activation and Step 1 Catalysis in Yeast Spliceosomes. PLoS Genet 2015; 11:e1005539. [PMID: 26393790 PMCID: PMC4579134 DOI: 10.1371/journal.pgen.1005539] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 08/27/2015] [Indexed: 01/10/2023] Open
Abstract
Little is known about contacts in the spliceosome between proteins and intron nucleotides surrounding the pre-mRNA branch-site and their dynamics during splicing. We investigated protein-pre-mRNA interactions by UV-induced crosslinking of purified yeast B(act) spliceosomes formed on site-specifically labeled pre-mRNA, and analyzed their changes after conversion to catalytically-activated B* and step 1 C complexes, using a purified splicing system. Contacts between nucleotides upstream and downstream of the branch-site and the U2 SF3a/b proteins Prp9, Prp11, Hsh49, Cus1 and Hsh155 were detected, demonstrating that these interactions are evolutionarily conserved. The RES proteins Pml1 and Bud13 were shown to contact the intron downstream of the branch-site. A comparison of the B(act) crosslinking pattern versus that of B* and C complexes revealed that U2 and RES protein interactions with the intron are dynamic. Upon step 1 catalysis, Cwc25 contacts with the branch-site region, and enhanced crosslinks of Prp8 and Prp45 with nucleotides surrounding the branch-site were observed. Cwc25's step 1 promoting activity was not dependent on its interaction with pre-mRNA, indicating it acts via protein-protein interactions. These studies provide important insights into the spliceosome's protein-pre-mRNA network and reveal novel RNP remodeling events during the catalytic activation of the spliceosome and step 1 of splicing.
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Affiliation(s)
- Cornelius Schneider
- Max Planck Institute for Biophysical Chemistry, Department of Cellular Biochemistry, Göttingen, Germany
| | - Dmitry E. Agafonov
- Max Planck Institute for Biophysical Chemistry, Department of Cellular Biochemistry, Göttingen, Germany
| | - Jana Schmitzová
- Max Planck Institute for Biophysical Chemistry, Department of Cellular Biochemistry, Göttingen, Germany
| | - Klaus Hartmuth
- Max Planck Institute for Biophysical Chemistry, Department of Cellular Biochemistry, Göttingen, Germany
| | - Patrizia Fabrizio
- Max Planck Institute for Biophysical Chemistry, Department of Cellular Biochemistry, Göttingen, Germany
| | - Reinhard Lührmann
- Max Planck Institute for Biophysical Chemistry, Department of Cellular Biochemistry, Göttingen, Germany
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7
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Wysoczański P, Schneider C, Xiang S, Munari F, Trowitzsch S, Wahl MC, Lührmann R, Becker S, Zweckstetter M. Cooperative structure of the heterotrimeric pre-mRNA retention and splicing complex. Nat Struct Mol Biol 2014; 21:911-8. [PMID: 25218446 DOI: 10.1038/nsmb.2889] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 08/15/2014] [Indexed: 02/08/2023]
Abstract
The precursor mRNA (pre-mRNA) retention and splicing (RES) complex is a spliceosomal complex that is present in yeast and humans and is important for RNA splicing and retention of unspliced pre-mRNA. Here, we present the solution NMR structure of the RES core complex from Saccharomyces cerevisiae. Complex formation leads to an intricate folding of three components-Snu17p, Bud13p and Pml1p-that stabilizes the RNA-recognition motif (RRM) fold of Snu17p and increases binding affinity in tertiary interactions between the components by more than 100-fold compared to that in binary interactions. RES interacts with pre-mRNA within the spliceosome, and through the assembly of the RES core complex RNA binding efficiency is increased. The three-dimensional structure of the RES core complex highlights the importance of cooperative folding and binding in the functional organization of the spliceosome.
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Affiliation(s)
- Piotr Wysoczański
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Cornelius Schneider
- Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - ShengQi Xiang
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Francesca Munari
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Simon Trowitzsch
- 1] Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany. [2]
| | - Markus C Wahl
- Laboratory of Structural Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Reinhard Lührmann
- Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Stefan Becker
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Markus Zweckstetter
- 1] Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany. [2] German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany. [3] Center for Nanoscale Microscopy and Molecular Physiology of the Brain, University Medical Center, Göttingen, Germany
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8
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Xu Q, Deller MC, Nielsen TK, Grant JC, Lesley SA, Elsliger MA, Deacon AM, Wilson IA. Structural insights into the recognition of phosphopeptide by the FHA domain of kanadaptin. PLoS One 2014; 9:e107309. [PMID: 25197798 PMCID: PMC4157861 DOI: 10.1371/journal.pone.0107309] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 08/09/2014] [Indexed: 01/15/2023] Open
Abstract
Kanadaptin is a nuclear protein of unknown function that is widely expressed in mammalian tissues. The crystal structure of the forkhead-associated (FHA) domain of human kanadaptin was determined to 1.6 Å resolution. The structure reveals an asymmetric dimer in which one monomer is complexed with a phosphopeptide mimic derived from a peptide segment from the N-terminus of a symmetry-related molecule as well as a sulfate bound to the structurally conserved phosphothreonine recognition cleft. This structure provides insights into the molecular recognition features utilized by this family of proteins and represents the first evidence that kanadaptin is likely involved in a phosphorylation-mediated signaling pathway. These results will be of use for designing experiments to further probe the function of kanadaptin.
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Affiliation(s)
- Qingping Xu
- Joint Center for Structural Genomics, La Jolla, California, United States of America
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California, United States of America
| | - Marc C. Deller
- Joint Center for Structural Genomics, La Jolla, California, United States of America
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Tine K. Nielsen
- Protein Production Facility, Novo Nordisk Foundation Center for Protein Research, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Joanna C. Grant
- Joint Center for Structural Genomics, La Jolla, California, United States of America
- Protein Sciences Department, Genomics Institute of the Novartis Research Foundation, San Diego, California, United States of America
| | - Scott A. Lesley
- Joint Center for Structural Genomics, La Jolla, California, United States of America
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California, United States of America
- Protein Sciences Department, Genomics Institute of the Novartis Research Foundation, San Diego, California, United States of America
| | - Marc-André Elsliger
- Joint Center for Structural Genomics, La Jolla, California, United States of America
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Ashley M. Deacon
- Joint Center for Structural Genomics, La Jolla, California, United States of America
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California, United States of America
| | - Ian A. Wilson
- Joint Center for Structural Genomics, La Jolla, California, United States of America
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California, United States of America
- * E-mail:
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9
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Tripsianes K, Friberg A, Barrandon C, Brooks M, van Tilbeurgh H, Seraphin B, Sattler M. A novel protein-protein interaction in the RES (REtention and Splicing) complex. J Biol Chem 2014; 289:28640-50. [PMID: 25160624 PMCID: PMC4192513 DOI: 10.1074/jbc.m114.592311] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The retention and splicing (RES) complex is a conserved spliceosome-associated module that was shown to enhance splicing of a subset of transcripts and promote the nuclear retention of unspliced pre-mRNAs in yeast. The heterotrimeric RES complex is organized around the Snu17p protein that binds to both the Bud13p and Pml1p subunits. Snu17p exhibits an RRM domain that resembles a U2AF homology motif (UHM) and Bud13p harbors a Trp residue reminiscent of an UHM-ligand motif (ULM). It has therefore been proposed that the interaction between Snu17p and Bud13p resembles canonical UHM-ULM complexes. Here, we have used biochemical and NMR structural analysis to characterize the structure of the yeast Snu17p-Bud13p complex. Unlike known UHMs that sequester the Trp residue of the ULM ligand in a hydrophobic pocket, Snu17p and Bud13p utilize a large interaction surface formed around the two helices of the Snu17p domain. In total 18 residues of the Bud13p ligand wrap around the Snu17p helical surface in an U-turn-like arrangement. The invariant Trp232 in Bud13p is located in the center of the turn, and contacts surface residues of Snu17p. The structural data are supported by mutational analysis and indicate that Snu17p provides an extended binding surface with Bud13p that is notably distinct from canonical UHM-ULM interactions. Our data highlight structural diversity in RRM-protein interactions, analogous to the one seen for nucleic acid interactions.
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Affiliation(s)
- Konstantinos Tripsianes
- From the Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 62500 Brno, Czech Republic,
| | - Anders Friberg
- the Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany, the Center for Integrated Protein Science Munich and Chair of Biomolecular NMR, TU München, Lichtenbergstr. 4, 85747 Garching, Germany
| | - Charlotte Barrandon
- the Centre de Génétique Moléculaire, CNRS, Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Mark Brooks
- the University Paris-Sud, Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, UMR8619, F-91405 Orsay, France, and
| | - Herman van Tilbeurgh
- the University Paris-Sud, Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, UMR8619, F-91405 Orsay, France, and
| | - Bertrand Seraphin
- the Centre de Génétique Moléculaire, CNRS, Avenue de la Terrasse, 91198 Gif sur Yvette, France, the Equipe Labellisée La Ligue, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Centre National de Recherche Scientifique (CNRS) UMR 7104, Institut National de Santé et de Recherche Médicale (INSERM) U964, Université de Strasbourg, 67404 Illkirch, France
| | - Michael Sattler
- the Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany, the Center for Integrated Protein Science Munich and Chair of Biomolecular NMR, TU München, Lichtenbergstr. 4, 85747 Garching, Germany,
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Wlodaver AM, Staley JP. The DExD/H-box ATPase Prp2p destabilizes and proofreads the catalytic RNA core of the spliceosome. RNA (NEW YORK, N.Y.) 2014; 20:282-94. [PMID: 24442613 PMCID: PMC3923124 DOI: 10.1261/rna.042598.113] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 10/30/2013] [Indexed: 05/25/2023]
Abstract
After undergoing massive RNA and protein rearrangements during assembly, the spliceosome undergoes a final, more subtle, ATP-dependent rearrangement that is essential for catalysis. This rearrangement requires the DEAH-box protein Prp2p, an RNA-dependent ATPase. Prp2p has been implicated in destabilizing interactions between the spliceosome and the protein complexes SF3 and RES, but a role for Prp2p in destabilizing RNA-RNA interactions has not been explored. Using directed molecular genetics in budding yeast, we have found that a cold-sensitive prp2 mutation is suppressed not only by mutations in SF3 and RES components but also by a range of mutations that disrupt the spliceosomal catalytic core element U2/U6 helix I, which is implicated in juxtaposing the 5' splice site and branch site and in positioning metal ions for catalysis within the context of a putative catalytic triplex; indeed, mutations in this putative catalytic triplex also suppressed a prp2 mutation. Remarkably, we also found that prp2 mutations rescue lethal mutations in U2/U6 helix I. These data provide evidence that RNA elements that comprise the catalytic core are already formed at the Prp2p stage and that Prp2p destabilizes these elements, directly or indirectly, both to proofread spliceosome activation and to promote reconfiguration of the spliceosome to a fully competent, catalytic conformation.
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11
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Machida S, Yuan YA. Crystal structure of Arabidopsis thaliana Dawdle forkhead-associated domain reveals a conserved phospho-threonine recognition cleft for dicer-like 1 binding. MOLECULAR PLANT 2013; 6:1290-1300. [PMID: 23313986 DOI: 10.1093/mp/sst007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Dawdle (DDL) is a microRNA processing protein essential for the development of Arabidopsis. DDL contains a putative nuclear localization signal at its amino-terminus and forkhead-associated (FHA) domain at the carboxyl-terminus. Here, we report the crystal structure of the FHA domain of Arabidopsis Dawdle, determined by multiple-wavelength anomalous dispersion method at 1.7-Å resolution. DDL FHA structure displays a seven-stranded β-sandwich architecture that contains a unique structural motif comprising two long anti-parallel strands. Strikingly, crystal packing of the DDL FHA domain reveals that a glutamate residue from the symmetry-related DDL FHA domain, a structural mimic of the phospho-threonine, is specifically recognized by the structurally conserved phospho-threonine binding cleft. Consistently with the structural observations, co-immuno-precipitation experiments performed in Nicotiana benthamiana show that the DDL FHA domain co-immuno-precipitates with DCL1 fragments containing the predicted pThr+3(Ile/Val/Leu/Asp) motif. Taken together, we count the recognition of the target residue by the canonical binding cleft of the DDL FHA domain as the key molecular event to instate FHA domain-mediated protein-protein interaction in plant miRNA processing.
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Affiliation(s)
- Satoru Machida
- Department of Biological Sciences and Centre for Bioimaging Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore
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Zhou Y, Chen C, Johansson MJO. The pre-mRNA retention and splicing complex controls tRNA maturation by promoting TAN1 expression. Nucleic Acids Res 2013; 41:5669-78. [PMID: 23605039 PMCID: PMC3675484 DOI: 10.1093/nar/gkt269] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The conserved pre-mRNA retention and splicing (RES) complex, which in yeast consists of Bud13p, Snu17p and Pml1p, is thought to promote nuclear retention of unspliced pre-mRNAs and enhance splicing of a subset of transcripts. Here, we find that the absence of Bud13p or Snu17p causes greatly reduced levels of the modified nucleoside N4-acetylcytidine (ac4C) in tRNA and that a lack of Pml1p reduces ac4C levels at elevated temperatures. The ac4C nucleoside is normally found at position 12 in the tRNA species specific for serine and leucine. We show that the tRNA modification defect in RES-deficient cells is attributable to inefficient splicing of TAN1 pre-mRNA and the effects of reduced Tan1p levels on formation of ac4C. Analyses of cis-acting elements in TAN1 pre-mRNA showed that the intron sequence between the 5′ splice site and branchpoint is necessary and sufficient to mediate RES dependency. We also show that in RES-deficient cells, the TAN1 pre-mRNA is targeted for degradation by the cytoplasmic nonsense-mediated mRNA decay pathway, indicating that poor nuclear retention may contribute to the tRNA modification defect. Our results demonstrate that TAN1 pre-mRNA processing has an unprecedented requirement for RES factors and that the complex controls the formation of ac4C in tRNA.
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Affiliation(s)
- Yang Zhou
- Department of Molecular Biology, Umeå University, 901 87 Umeå, Sweden
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13
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Tuo S, Nakashima K, Pringle JR. Apparent defect in yeast bud-site selection due to a specific failure to splice the pre-mRNA of a regulator of cell-type-specific transcription. PLoS One 2012; 7:e47621. [PMID: 23118884 PMCID: PMC3485267 DOI: 10.1371/journal.pone.0047621] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2011] [Accepted: 09/19/2012] [Indexed: 11/22/2022] Open
Abstract
The yeast Saccharomyces cerevisiae normally selects bud sites (and hence axes of cell polarization) in one of two distinct patterns, the axial pattern of haploid cells and the bipolar pattern of diploid cells. Although many of the proteins involved in bud-site selection are known, it is likely that others remain to be identified. Confirming a previous report (Ni and Snyder, 2001, Mol. Biol. Cell 12, 2147-2170), we found that diploids homozygous for deletions of IST3/SNU17 or BUD13 do not show normal bipolar budding. However, these abnormalities do not reflect defects in the apparatus of bipolar budding. Instead, the absence of Ist3 or Bud13 results in a specific defect in the splicing of the MATa1 pre-mRNA, which encodes a repressor that normally blocks expression of haploid-specific genes in diploid cells. When Mata1 protein is lacking, Axl1, a haploid-specific protein critical for the choice between axial and bipolar budding, is expressed ectopically in diploid cells and disrupts bipolar budding. The involvement of Ist3 and Bud13 in pre-mRNA splicing is by now well known, but the degree of specificity shown here for MATa1 pre-mRNA, which has no obvious basis in the pre-mRNA structure, is rather surprising in view of current models for the functions of these proteins. Moreover, we found that deletion of PML1, whose product is thought to function together with Ist3 and Bud13 in a three-protein retention-and-splicing (RES) complex, had no detectable effect on the splicing in vivo of either MATa1 or four other pre-mRNAs.
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Affiliation(s)
| | | | - John R. Pringle
- Department of Genetics, Stanford University School of Medicine, Stanford, California, United States of America
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Collinet B, Friberg A, Brooks MA, van den Elzen T, Henriot V, Dziembowski A, Graille M, Durand D, Leulliot N, Saint André C, Lazar N, Sattler M, Séraphin B, van Tilbeurgh H. Strategies for the structural analysis of multi-protein complexes: lessons from the 3D-Repertoire project. J Struct Biol 2011; 175:147-58. [PMID: 21463689 DOI: 10.1016/j.jsb.2011.03.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Revised: 03/18/2011] [Accepted: 03/19/2011] [Indexed: 11/25/2022]
Abstract
Structural studies of multi-protein complexes, whether by X-ray diffraction, scattering, NMR spectroscopy or electron microscopy, require stringent quality control of the component samples. The inability to produce 'keystone' subunits in a soluble and correctly folded form is a serious impediment to the reconstitution of the complexes. Co-expression of the components offers a valuable alternative to the expression of single proteins as a route to obtain sufficient amounts of the sample of interest. Even in cases where milligram-scale quantities of purified complex of interest become available, there is still no guarantee that good quality crystals can be obtained. At this step, protein engineering of one or more components of the complex is frequently required to improve solubility, yield or the ability to crystallize the sample. Subsequent characterization of these constructs may be performed by solution techniques such as Small Angle X-ray Scattering and Nuclear Magnetic Resonance to identify 'well behaved' complexes. Herein, we recount our experiences gained at protein production and complex assembly during the European 3D Repertoire project (3DR). The goal of this consortium was to obtain structural information on multi-protein complexes from yeast by combining crystallography, electron microscopy, NMR and in silico modeling methods. We present here representative set case studies of complexes that were produced and analyzed within the 3DR project. Our experience provides useful insight into strategies that are more generally applicable for structural analysis of protein complexes.
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Affiliation(s)
- B Collinet
- IBBMC-CNRS UMR8619, IFR 115, Bât. 430, Université Paris-Sud, 91405 Orsay, France
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15
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Current awareness on yeast. Yeast 2009. [DOI: 10.1002/yea.1623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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16
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Netter C, Weber G, Benecke H, Wahl MC. Functional stabilization of an RNA recognition motif by a noncanonical N-terminal expansion. RNA (NEW YORK, N.Y.) 2009; 15:1305-13. [PMID: 19447915 PMCID: PMC2704084 DOI: 10.1261/rna.1359909] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
RNA recognition motifs (RRMs) constitute versatile macromolecular interaction platforms. They are found in many components of spliceosomes, in which they mediate RNA and protein interactions by diverse molecular strategies. The human U11/U12-65K protein of the minor spliceosome employs a C-terminal RRM to bind hairpin III of the U12 small nuclear RNA (snRNA). This interaction comprises one side of a molecular bridge between the U11 and U12 small nuclear ribonucleoprotein particles (snRNPs) and is reminiscent of the binding of the N-terminal RRMs in the major spliceosomal U1A and U2B'' proteins to hairpins in their cognate snRNAs. Here we show by mutagenesis and electrophoretic mobility shift assays that the beta-sheet surface and a neighboring loop of 65K C-terminal RRM are involved in RNA binding, as previously seen in canonical RRMs like the N-terminal RRMs of the U1A and U2B'' proteins. However, unlike U1A and U2B'', some 30 residues N-terminal of the 65K C-terminal RRM core are additionally required for stable U12 snRNA binding. The crystal structure of the expanded 65K C-terminal RRM revealed that the N-terminal tail adopts an alpha-helical conformation and wraps around the protein toward the face opposite the RNA-binding platform. Point mutations in this part of the protein had only minor effects on RNA affinity. Removal of the N-terminal extension significantly decreased the thermal stability of the 65K C-terminal RRM. These results demonstrate that the 65K C-terminal RRM is augmented by an N-terminal element that confers stability to the domain, and thereby facilitates stable RNA binding.
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MESH Headings
- Crystallography, X-Ray
- Electrophoretic Mobility Shift Assay
- Humans
- Models, Molecular
- Protein Conformation
- Protein Structure, Secondary
- RNA, Small Nuclear/genetics
- RNA, Small Nuclear/metabolism
- Ribonucleoprotein, U1 Small Nuclear/genetics
- Ribonucleoprotein, U1 Small Nuclear/metabolism
- Ribonucleoproteins, Small Nuclear/chemistry
- Ribonucleoproteins, Small Nuclear/genetics
- Ribonucleoproteins, Small Nuclear/metabolism
- Spliceosomes
- snRNP Core Proteins/genetics
- snRNP Core Proteins/metabolism
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Affiliation(s)
- Catharina Netter
- Max-Planck-Institut für Biophysikalische Chemie, D-37077 Göttingen, Germany
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