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Dulic M, Godinic-Mikulcic V, Kekez M, Evic V, Rokov-Plavec J. Protein-Protein Interactions of Seryl-tRNA Synthetases with Emphasis on Human Counterparts and Their Connection to Health and Disease. Life (Basel) 2024; 14:124. [PMID: 38255739 PMCID: PMC10817482 DOI: 10.3390/life14010124] [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: 12/06/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/24/2024] Open
Abstract
Seryl-tRNA synthetases (SerRSs), members of the aminoacyl-tRNA synthetase family, interact with diverse proteins, enabling SerRSs to enhance their role in the translation of the genetic message or to perform alternative functions in cellular processes beyond translation. Atypical archaeal SerRS interacts with arginyl-tRNA synthetase and proteins of the ribosomal P-stalk to optimize translation through tRNA channeling. The complex between yeast SerRS and peroxin Pex21p provides a connection between translation and peroxisome function. The partnership between Arabidopsis SerRS and BEN1 indicates a link between translation and brassinosteroid metabolism and may be relevant in plant stress response mechanisms. In Drosophila, the unusual heterodimeric mitochondrial SerRS coordinates mitochondrial translation and replication via interaction with LON protease. Evolutionarily conserved interactions of yeast and human SerRSs with m3C32 tRNA methyltransferases indicate coordination between tRNA modification and aminoacylation in the cytosol and mitochondria. Human cytosolic SerRS is a cellular hub protein connecting translation to vascular development, angiogenesis, lipogenesis, and telomere maintenance. When translocated to the nucleus, SerRS acts as a master negative regulator of VEGFA gene expression. SerRS alone or in complex with YY1 and SIRT2 competes with activating transcription factors NFκB1 and c-Myc, resulting in balanced VEGFA expression important for proper vascular development and angiogenesis. In hypoxia, SerRS phosphorylation diminishes its binding to the VEGFA promoter, while the lack of nutrients triggers SerRS glycosylation, reducing its nuclear localization. Additionally, SerRS binds telomeric DNA and cooperates with the shelterin protein POT1 to regulate telomere length and cellular senescence. As an antitumor and antiangiogenic factor, human cytosolic SerRS appears to be a promising drug target and therapeutic agent for treating cancer, cardiovascular diseases, and possibly obesity and aging.
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Affiliation(s)
| | | | | | | | - Jasmina Rokov-Plavec
- Division of Biochemistry, Department of Chemistry, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia; (M.D.); (V.G.-M.); (M.K.); (V.E.)
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2
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de Potter B, Vallee I, Camacho N, Filipe Costa Póvoas L, Bonsembiante A, Pons i Pons A, Eckhard U, Gomis-Rüth FX, Yang XL, Schimmel P, Kuhle B, Ribas de Pouplana L. Domain collapse and active site ablation generate a widespread animal mitochondrial seryl-tRNA synthetase. Nucleic Acids Res 2023; 51:10001-10010. [PMID: 37638745 PMCID: PMC10570016 DOI: 10.1093/nar/gkad696] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/03/2023] [Accepted: 08/14/2023] [Indexed: 08/29/2023] Open
Abstract
Through their aminoacylation reactions, aminoacyl tRNA-synthetases (aaRS) establish the rules of the genetic code throughout all of nature. During their long evolution in eukaryotes, additional domains and splice variants were added to what is commonly a homodimeric or monomeric structure. These changes confer orthogonal functions in cellular activities that have recently been uncovered. An unusual exception to the familiar architecture of aaRSs is the heterodimeric metazoan mitochondrial SerRS. In contrast to domain additions or alternative splicing, here we show that heterodimeric metazoan mitochondrial SerRS arose from its homodimeric ancestor not by domain additions, but rather by collapse of an entire domain (in one subunit) and an active site ablation (in the other). The collapse/ablation retains aminoacylation activity while creating a new surface, which is necessary for its orthogonal function. The results highlight a new paradigm for repurposing a member of the ancient tRNA synthetase family.
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Affiliation(s)
- Bastiaan de Potter
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Catalonia, Spain
- Utrecht University Faculty of Science, Department of Biology, Theoretical Biology and Bioinformatics Utrecht, Utrecht, The Netherlands
| | - Ingrid Vallee
- The Scripps Research Institute, Department of Molecular Medicine La Jolla, CA, USA
| | - Noelia Camacho
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Catalonia, Spain
| | - Luís Filipe Costa Póvoas
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Catalonia, Spain
| | - Aureliano Bonsembiante
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Catalonia, Spain
| | - Alba Pons i Pons
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Catalonia, Spain
| | - Ulrich Eckhard
- Molecular Biology Institute of Barcelona, Department of Structural Biology, Barcelona, Catalunya, Spain
| | | | - Xiang-Lei Yang
- The Scripps Research Institute, Department of Molecular Medicine La Jolla, CA, USA
| | - Paul Schimmel
- The Scripps Research Institute, Department of Molecular Medicine La Jolla, CA, USA
| | - Bernhard Kuhle
- The Scripps Research Institute, Department of Molecular Medicine La Jolla, CA, USA
| | - Lluís Ribas de Pouplana
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Catalonia, Spain
- ICREA, Catalan Institution for Research and Advanced Studies Barcelona, Catalonia, Spain
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3
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Picchioni D, Antolin-Fontes A, Camacho N, Schmitz C, Pons-Pons A, Rodríguez-Escribà M, Machallekidou A, Güler MN, Siatra P, Carretero-Junquera M, Serrano A, Hovde SL, Knobel PA, Novoa EM, Solà-Vilarrubias M, Kaguni LS, Stracker TH, Ribas de Pouplana L. Mitochondrial Protein Synthesis and mtDNA Levels Coordinated through an Aminoacyl-tRNA Synthetase Subunit. Cell Rep 2020; 27:40-47.e5. [PMID: 30943413 DOI: 10.1016/j.celrep.2019.03.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 02/13/2019] [Accepted: 03/06/2019] [Indexed: 11/28/2022] Open
Abstract
The aminoacylation of tRNAs by aminoacyl-tRNA synthetases (ARSs) is a central reaction in biology. Multiple regulatory pathways use the aminoacylation status of cytosolic tRNAs to monitor and regulate metabolism. The existence of equivalent regulatory networks within the mitochondria is unknown. Here, we describe a functional network that couples protein synthesis to DNA replication in animal mitochondria. We show that a duplication of the gene coding for mitochondrial seryl-tRNA synthetase (SerRS2) generated in arthropods a paralog protein (SLIMP) that forms a heterodimeric complex with a SerRS2 monomer. This seryl-tRNA synthetase variant is essential for protein synthesis and mitochondrial respiration. In addition, SLIMP interacts with the substrate binding domain of the mitochondrial protease LON, thus stimulating proteolysis of the DNA-binding protein TFAM and preventing mitochondrial DNA (mtDNA) accumulation. Thus, mitochondrial translation is directly coupled to mtDNA levels by a network based upon a profound structural modification of an animal ARS.
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Affiliation(s)
- Daria Picchioni
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Albert Antolin-Fontes
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Noelia Camacho
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Claus Schmitz
- Structural MitoLab, Department of Structural Biology, Molecular Biology Institute Barcelona (IBMB-CSIC), Barcelona, Spain
| | - Alba Pons-Pons
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Marta Rodríguez-Escribà
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Antigoni Machallekidou
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Merve Nur Güler
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Panagiota Siatra
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Maria Carretero-Junquera
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Alba Serrano
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Stacy L Hovde
- Department of Biochemistry and Molecular Biology and Center for Mitochondrial Science and Medicine, Michigan State University, East Lansing, MI, USA
| | - Philip A Knobel
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain; Laboratory for Molecular Radiobiology, Clinic of Radiation Oncology, University of Zurich, 8057 Zurich, Switzerland
| | - Eva M Novoa
- Centre for Genomic Regulation (CRG), the Barcelona Institute of Science and Technology (BIST), Doctor Aiguader 88, 08003 Barcelona, Spain; Garvan Institute of Medical Research, 384 Victoria Street, 2010 Darlinghurst, NSW, Australia
| | - Maria Solà-Vilarrubias
- Structural MitoLab, Department of Structural Biology, Molecular Biology Institute Barcelona (IBMB-CSIC), Barcelona, Spain
| | - Laurie S Kaguni
- Department of Biochemistry and Molecular Biology and Center for Mitochondrial Science and Medicine, Michigan State University, East Lansing, MI, USA; Institute of Biosciences and Medical Technology, University of Tampere, 33014 Tampere, Finland
| | - Travis H Stracker
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain
| | - Lluís Ribas de Pouplana
- Institute for Research in Biomedicine (IRB Barcelona), the Barcelona Institute of Science and Technology, Parc Científic de Barcelona, C/Baldiri Reixac 10, 08028 Barcelona, Catalonia, Spain; Catalan Institution for Research and Advanced Studies (ICREA), P/Lluis Companys 23, 08010 Barcelona, Catalonia, Spain.
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4
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Cooper JC, Lukacs A, Reich S, Schauer T, Imhof A, Phadnis N. Altered Localization of Hybrid Incompatibility Proteins in Drosophila. Mol Biol Evol 2020; 36:1783-1792. [PMID: 31038678 PMCID: PMC6657725 DOI: 10.1093/molbev/msz105] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Understanding the molecular basis of hybrid incompatibilities is a fundamental pursuit in evolutionary genetics. In crosses between Drosophila melanogaster females and Drosophila simulans males, an interaction between at least three genes is necessary for hybrid male lethality: Hmr mel, Lhr sim, and gfzf sim. Although HMR and LHR physically bind each other and function together in a single complex, the connection between gfzf and either of these proteins remains mysterious. Here, we show that GFZF localizes to many regions of the genome in both D. melanogaster and D. simulans, including at telomeric retrotransposon repeats. We find that GFZF localization at telomeres is significantly different between these two species, reflecting the rapid evolution of telomeric retrotransposon copy number composition between the two species. Next, we show that GFZF and HMR normally do not colocalize in D. melanogaster. In interspecies hybrids, however, HMR shows extensive mis-localization to GFZF sites, thus uncovering a new molecular interaction between these hybrid incompatibility factors. We find that spreading of HMR to GFZF sites requires gfzf sim but not Lhr sim, suggesting distinct roles for these factors in the hybrid incompatibility. Finally, we find that overexpression of HMR and LHR within species is sufficient to mis-localize HMR to GFZF binding sites, indicating that HMR has a natural low affinity for GFZF sites. Together, these studies provide the first insights into the different properties of gfzf between D. melanogaster and D. simulans, and uncover a molecular interaction between gfzf and Hmr in the form of altered protein localization.
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Affiliation(s)
| | - Andrea Lukacs
- Faculty of Medicine, Institute for Molecular Biology, Biomedical Center (BMC), LMU Munich, Germany
| | - Shelley Reich
- School of Biological Sciences, University of Utah, Salt Lake City, UT
| | - Tamas Schauer
- Faculty of Medicine, Institute for Molecular Biology, Biomedical Center (BMC), LMU Munich, Germany
| | - Axel Imhof
- Faculty of Medicine, Institute for Molecular Biology, Biomedical Center (BMC), LMU Munich, Germany.,Center for Integrated Protein Science Munich (CIPSM), Ludwig-Maximilians-Universität Müchen, Munich, Germany
| | - Nitin Phadnis
- School of Biological Sciences, University of Utah, Salt Lake City, UT
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5
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Rossi F, Molnar C, Hashiyama K, Heinen JP, Pampalona J, Llamazares S, Reina J, Hashiyama T, Rai M, Pollarolo G, Fernández-Hernández I, Gonzalez C. An in vivo genetic screen in Drosophila identifies the orthologue of human cancer/testis gene SPO11 among a network of targets to inhibit lethal(3)malignant brain tumour growth. Open Biol 2018; 7:rsob.170156. [PMID: 28855394 PMCID: PMC5577452 DOI: 10.1098/rsob.170156] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Accepted: 07/27/2017] [Indexed: 12/31/2022] Open
Abstract
Using transgenic RNAi technology, we have screened over 4000 genes to identify targets to inhibit malignant growth caused by the loss of function of lethal(3)malignant brain tumour in Drosophila in vivo. We have identified 131 targets, which belong to a wide range of gene ontologies. Most of these target genes are not significantly overexpressed in mbt tumours hence showing that, rather counterintuitively, tumour-linked overexpression is not a good predictor of functional requirement. Moreover, we have found that most of the genes upregulated in mbt tumours remain overexpressed in tumour-suppressed double-mutant conditions, hence revealing that most of the tumour transcriptome signature is not necessarily correlated with malignant growth. One of the identified target genes is meiotic W68 (mei-W68), the Drosophila orthologue of the human cancer/testis gene Sporulation-specific protein 11 (SPO11), the enzyme that catalyses the formation of meiotic double-strand breaks. We show that Drosophila mei-W68/SPO11 drives oncogenesis by causing DNA damage in a somatic tissue, hence providing the first instance in which a SPO11 orthologue is unequivocally shown to have a pro-tumoural role. Altogether, the results from this screen point to the possibility of investigating the function of human cancer relevant genes in a tractable experimental model organism like Drosophila.
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Affiliation(s)
- Fabrizio Rossi
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Cristina Molnar
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Kazuya Hashiyama
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Jan P Heinen
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Judit Pampalona
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Salud Llamazares
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - José Reina
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Tomomi Hashiyama
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Madhulika Rai
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Giulia Pollarolo
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Ismael Fernández-Hernández
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Cayetano Gonzalez
- Cell Division Group, Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain .,Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys, 08010 Barcelona, Spain
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6
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GFZF, a Glutathione S-Transferase Protein Implicated in Cell Cycle Regulation and Hybrid Inviability, Is a Transcriptional Coactivator. Mol Cell Biol 2018; 38:MCB.00476-17. [PMID: 29158293 DOI: 10.1128/mcb.00476-17] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 11/10/2017] [Indexed: 01/11/2023] Open
Abstract
The core promoters of protein-encoding genes play a central role in regulating transcription. M1BP is a transcriptional activator that associates with a core promoter element known as Motif 1 that resides at thousands of genes in Drosophila To gain insight into how M1BP functions, we identified an interacting protein called GFZF. GFZF had been previously identified in genetic screens for factors involved in maintenance of hybrid inviability, the G2-M DNA damage checkpoint, and RAS/mitogen-activated protein kinase (MAPK) signaling, but its contribution to these processes was unknown. Here, we show that GFZF resides in the nucleus and functions as a transcriptional coactivator. In addition, we show that GFZF is a glutathione S-transferase (GST). Thus, GFZF is the first transcriptional coactivator with intrinsic GST activity, and its identification as a transcriptional coactivator provides an explanation for its role in numerous biological processes.
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7
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Abstract
Uncovering the genetic and molecular basis of barriers to gene flow between populations is key to understanding how new species are born. Intrinsic postzygotic reproductive barriers such as hybrid sterility and hybrid inviability are caused by deleterious genetic interactions known as hybrid incompatibilities. The difficulty in identifying these hybrid incompatibility genes remains a rate-limiting step in our understanding of the molecular basis of speciation. We recently described how whole genome sequencing can be applied to identify hybrid incompatibility genes, even from genetically terminal hybrids. Using this approach, we discovered a new hybrid incompatibility gene, gfzf, between Drosophila melanogaster and Drosophila simulans, and found that it plays an essential role in cell cycle regulation. Here, we discuss the history of the hunt for incompatibility genes between these species, discuss the molecular roles of gfzf in cell cycle regulation, and explore how intragenomic conflict drives the evolution of fundamental cellular mechanisms that lead to the developmental arrest of hybrids.
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Affiliation(s)
- Jacob C Cooper
- a Department of Biology , University of Utah , Salt Lake City , UT , USA
| | - Nitin Phadnis
- a Department of Biology , University of Utah , Salt Lake City , UT , USA
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8
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Phadnis N, Baker EP, Cooper JC, Frizzell KA, Hsieh E, de la Cruz AFA, Shendure J, Kitzman JO, Malik HS. An essential cell cycle regulation gene causes hybrid inviability in Drosophila. Science 2016; 350:1552-5. [PMID: 26680200 DOI: 10.1126/science.aac7504] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Speciation, the process by which new biological species arise, involves the evolution of reproductive barriers, such as hybrid sterility or inviability between populations. However, identifying hybrid incompatibility genes remains a key obstacle in understanding the molecular basis of reproductive isolation. We devised a genomic screen, which identified a cell cycle-regulation gene as the cause of male inviability in hybrids resulting from a cross between Drosophila melanogaster and D. simulans. Ablation of the D. simulans allele of this gene is sufficient to rescue the adult viability of hybrid males. This dominantly acting cell cycle regulator causes mitotic arrest and, thereby, inviability of male hybrid larvae. Our genomic method provides a facile means to accelerate the identification of hybrid incompatibility genes in other model and nonmodel systems.
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Affiliation(s)
- Nitin Phadnis
- Department of Biology, University of Utah, Salt Lake City, UT 84112, USA.
| | - EmilyClare P Baker
- Basic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Jacob C Cooper
- Department of Biology, University of Utah, Salt Lake City, UT 84112, USA
| | | | - Emily Hsieh
- Basic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | | | - Jay Shendure
- Genome Sciences, University of Washington, Seattle, WA 98195, USA. Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA
| | - Jacob O Kitzman
- Genome Sciences, University of Washington, Seattle, WA 98195, USA. Department of Human Genetics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Harmit S Malik
- Basic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA. Howard Hughes Medical Institute, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
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Truscott M, Islam ABMMK, Frolov MV. Novel regulation and functional interaction of polycistronic miRNAs. RNA (NEW YORK, N.Y.) 2016; 22:129-138. [PMID: 26554028 PMCID: PMC4691827 DOI: 10.1261/rna.053264.115] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Accepted: 10/14/2015] [Indexed: 05/30/2023]
Abstract
The importance of microRNAs in gene expression and disease is well recognized. However, what is less appreciated is that almost half of miRNA genes are organized in polycistronic clusters and are therefore coexpressed. The mir-11∼998 cluster consists of two miRNAs, miR-11 and miR-998. Here, we describe a novel layer of regulation that links the processing and expression of miR-998 to the presence of the mir-11 gene. We show that the presence of miR-11 in the pri-miRNA is required for processing by Drosha, and deletion of mir-11 prevents the expression of miR-998. Replacing mir-11 with an unrelated miRNA rescued miR-998 expression in vivo and in vitro, as did expressing miR-998 from a shorter, more canonical miRNA scaffold. The embedded regulation of miR-998 is functionally important because unchecked miR-998 expression in the absence of miR-11 resulted in pleiotropic developmental defects. This novel regulation of expression of miRNAs within a cluster is not limited to the mir-11∼998 cluster and, thus, likely reflects the more general cis-regulation of expression of individual miRNAs. Collectively, our results uncover a novel layer of regulation within miRNA clusters that tempers the functions of the individual miRNAs. Unlinking their expression has the potential to change the expression of multiple miRNA targets and shift a biological response.
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Affiliation(s)
- Mary Truscott
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Abul B M M K Islam
- Department of Genetic Engineering and Biotechnology, University of Dhaka, Dhaka 1000, Bangladesh
| | - Maxim V Frolov
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
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10
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Ashton-Beaucage D, Udell CM, Gendron P, Sahmi M, Lefrançois M, Baril C, Guenier AS, Duchaine J, Lamarre D, Lemieux S, Therrien M. A functional screen reveals an extensive layer of transcriptional and splicing control underlying RAS/MAPK signaling in Drosophila. PLoS Biol 2014; 12:e1001809. [PMID: 24643257 PMCID: PMC3958334 DOI: 10.1371/journal.pbio.1001809] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 02/05/2014] [Indexed: 12/11/2022] Open
Abstract
A global RNAi screening approach in Drosophila cells identifies a large group of transcription and splicing factors that modulate RAS/MAPK signaling by altering the expression of MAPK. The small GTPase RAS is among the most prevalent oncogenes. The evolutionarily conserved RAF-MEK-MAPK module that lies downstream of RAS is one of the main conduits through which RAS transmits proliferative signals in normal and cancer cells. Genetic and biochemical studies conducted over the last two decades uncovered a small set of factors regulating RAS/MAPK signaling. Interestingly, most of these were found to control RAF activation, thus suggesting a central regulatory role for this event. Whether additional factors are required at this level or further downstream remains an open question. To obtain a comprehensive view of the elements functionally linked to the RAS/MAPK cascade, we used a quantitative assay in Drosophila S2 cells to conduct a genome-wide RNAi screen for factors impacting RAS-mediated MAPK activation. The screen led to the identification of 101 validated hits, including most of the previously known factors associated to this pathway. Epistasis experiments were then carried out on individual candidates to determine their position relative to core pathway components. While this revealed several new factors acting at different steps along the pathway—including a new protein complex modulating RAF activation—we found that most hits unexpectedly work downstream of MEK and specifically influence MAPK expression. These hits mainly consist of constitutive splicing factors and thereby suggest that splicing plays a specific role in establishing MAPK levels. We further characterized two representative members of this group and surprisingly found that they act by regulating mapk alternative splicing. This study provides an unprecedented assessment of the factors modulating RAS/MAPK signaling in Drosophila. In addition, it suggests that pathway output does not solely rely on classical signaling events, such as those controlling RAF activation, but also on the regulation of MAPK levels. Finally, it indicates that core splicing components can also specifically impact alternative splicing. The RAS/MAPK pathway is a cornerstone of the cell proliferation signaling apparatus. It has a notable involvement in cancer as mutations in the components of the pathway are associated with aberrant proliferation. Previous work has focused predominantly on post-translational regulation of RAS/MAPK signaling such that a large and intricate network of factors is now known to act on core pathway components. However, regulation at the pre-translational level has not been examined nearly as extensively and is comparatively poorly understood. In this study, we used an unbiased and global screening approach to survey the Drosophila genome—using Drosophila cultured cells—for novel regulators of this pathway. Surprisingly, a majority of our hits were associated to either transcription or mRNA splicing. We used a series of secondary screening assays to determine which part of the RAS/MAPK pathway these candidates target. We found that these factors were not equally distributed along the pathway, but rather converged predominantly on mapk mRNA expression and processing. Our findings raise the intriguing possibility that regulation of mapk transcript production is a key step for a diverse set of regulatory inputs, and may play an important part in RAS/MAPK signaling dynamics.
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Affiliation(s)
- Dariel Ashton-Beaucage
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Christian M. Udell
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Patrick Gendron
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Malha Sahmi
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Martin Lefrançois
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Caroline Baril
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Anne-Sophie Guenier
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Jean Duchaine
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
| | - Daniel Lamarre
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
- Département de médecine, Université de Montréal, Montréal, Québec, Canada
| | - Sébastien Lemieux
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
- Département d'informatique et de recherche opérationnelle, Université de Montréal, Montréal, Québec, Canada
| | - Marc Therrien
- Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, Montréal, Québec, Canada
- Département de pathologie et de biologie cellulaire, Université de Montréal, Montréal, Québec, Canada
- * E-mail:
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Bayarmagnai B, Nicolay BN, Islam ABMMK, Lopez-Bigas N, Frolov MV. Drosophila GAGA factor is required for full activation of the dE2f1-Yki/Sd transcriptional program. Cell Cycle 2012; 11:4191-202. [PMID: 23070566 DOI: 10.4161/cc.22486] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The Hippo signaling pathway regulates organ size by controlling the activity of the transcriptional co-activator Yorkie (Yki). Yki is recruited to its target genes by DNA-binding proteins such as Scalloped (Sd). In addition, transcription factor dE2f1, of the Retinoblastoma (Rb) pathway, cooperates with Yki/Sd to synergistically activate a set of common cell cycle target genes. However, little is known about other factors that ensure the proper transcriptional output of Hippo signaling. In this report we identified the chromatin protein GAGA factor (GAF), which is encoded by the Trithorax-like (Trl) gene, as a novel and critical partner in transcriptional regulation by Yki/Sd and dE2f1. We show that GAF is required for the full activation of target genes by dE2f1 and Yki/Sd; while ablation of GAF compromises both normal and inappropriate cell proliferation driven by Yki and dE2f1 in multiple tissues. The importance of GAF is further supported by strong genetic interactions between GAF and the Rb and Hippo pathways. Additionally, we show that GAF directly interacts with RBF, a Drosophila pRB homolog, and partially co-localizes with RBF on polytene chromosomes. Collectively, our data provide a novel connection between a chromatin-binding protein and a transcriptional program governed by the Hippo and Rb pathways.
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Affiliation(s)
- Battuya Bayarmagnai
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL, USA
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12
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Anderson AE, Karandikar UC, Pepple KL, Chen Z, Bergmann A, Mardon G. The enhancer of trithorax and polycomb gene Caf1/p55 is essential for cell survival and patterning in Drosophila development. Development 2011; 138:1957-66. [PMID: 21490066 DOI: 10.1242/dev.058461] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In vitro data suggest that the human RbAp46 and RbAp48 genes encode proteins involved in multiple chromatin remodeling complexes and are likely to play important roles in development and tumor suppression. However, to date, our understanding of the role of RbAp46/RbAp48 and its homologs in metazoan development and disease has been hampered by a lack of insect and mammalian mutant models, as well as redundancy due to multiple orthologs in most organisms studied. Here, we report the first mutations in the single Drosophila RbAp46/RbAp48 homolog Caf1, identified as strong suppressors of a senseless overexpression phenotype. Reduced levels of Caf1 expression result in flies with phenotypes reminiscent of Hox gene misregulation. Additionally, analysis of Caf1 mutant tissue suggests that Caf1 plays important roles in cell survival and segment identity, and loss of Caf1 is associated with a reduction in the Polycomb Repressive Complex 2 (PRC2)-specific histone methylation mark H3K27me3. Taken together, our results suggest suppression of senseless overexpression by mutations in Caf1 is mediated by participation of Caf1 in PRC2-mediated silencing. More importantly, our mutant phenotypes confirm that Caf1-mediated silencing is vital to Drosophila development. These studies underscore the importance of Caf1 and its mammalian homologs in development and disease.
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Affiliation(s)
- Aimée E Anderson
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
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13
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Guitart T, Leon Bernardo T, Sagalés J, Stratmann T, Bernués J, Ribas de Pouplana L. New aminoacyl-tRNA synthetase-like protein in insecta with an essential mitochondrial function. J Biol Chem 2010; 285:38157-66. [PMID: 20870726 PMCID: PMC2992249 DOI: 10.1074/jbc.m110.167486] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Revised: 09/22/2010] [Indexed: 12/24/2022] Open
Abstract
Aminoacyl-tRNA synthetases (ARS) are modular enzymes that aminoacylate transfer RNAs (tRNA) for their use by the ribosome during protein synthesis. ARS are essential and universal components of the genetic code that were almost completely established before the appearance of the last common ancestor of all living species. This long evolutionary history explains the growing number of functions being discovered for ARS, and for ARS homologues, beyond their canonical role in gene translation. Here we present a previously uncharacterized paralogue of seryl-tRNA synthetase named SLIMP (seryl-tRNA synthetase-like insect mitochondrial protein). SLIMP is the result of a duplication of a mitochondrial seryl-tRNA synthetase (SRS) gene that took place in early metazoans and was fixed in Insecta. Here we show that SLIMP is localized in the mitochondria, where it carries out an essential function that is unrelated to the aminoacylation of tRNA. The knockdown of SLIMP by RNA interference (RNAi) causes a decrease in respiration capacity and an increase in mitochondrial mass in the form of aberrant mitochondria.
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Affiliation(s)
- Tanit Guitart
- From the Institute for Research in Biomedicine (IRB), C/ Baldiri Reixac 12, 08028 Barcelona, Catalonia
| | - Teresa Leon Bernardo
- From the Institute for Research in Biomedicine (IRB), C/ Baldiri Reixac 12, 08028 Barcelona, Catalonia
| | - Jessica Sagalés
- From the Institute for Research in Biomedicine (IRB), C/ Baldiri Reixac 12, 08028 Barcelona, Catalonia
| | - Thomas Stratmann
- the Department of Physiology, University of Barcelona (Biology), Avinguda Diagonal 645, 08028 Barcelona, Catalonia
| | - Jordi Bernués
- From the Institute for Research in Biomedicine (IRB), C/ Baldiri Reixac 12, 08028 Barcelona, Catalonia
- the Institut de Biología Molecular de Barcelona, Consejo Superior de Investigaciones Científicas (CSIC), Parc Cientific de Barcelona, Carrer Baldiri Reixac 12, 08028 Barcelona, Catalonia, and
| | - Lluís Ribas de Pouplana
- From the Institute for Research in Biomedicine (IRB), C/ Baldiri Reixac 12, 08028 Barcelona, Catalonia
- the Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Catalonia, Spain
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