1
|
Gene Amplification as a Mechanism of Yeast Adaptation to Nonsense Mutations in Release Factor Genes. Genes (Basel) 2021; 12:genes12122019. [PMID: 34946968 PMCID: PMC8701342 DOI: 10.3390/genes12122019] [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: 10/16/2021] [Revised: 12/13/2021] [Accepted: 12/15/2021] [Indexed: 11/17/2022] Open
Abstract
Protein synthesis (translation) is one of the fundamental processes occurring in the cells of living organisms. Translation can be divided into three key steps: initiation, elongation, and termination. In the yeast Saccharomyces cerevisiae, there are two translation termination factors, eRF1 and eRF3. These factors are encoded by the SUP45 and SUP35 genes, which are essential; deletion of any of them leads to the death of yeast cells. However, viable strains with nonsense mutations in both the SUP35 and SUP45 genes were previously obtained in several groups. The survival of such mutants clearly involves feedback control of premature stop codon readthrough; however, the exact molecular basis of such feedback control remain unclear. To investigate the genetic factors supporting the viability of these SUP35 and SUP45 nonsense mutants, we performed whole-genome sequencing of strains carrying mutant sup35-n and sup45-n alleles; while no common SNPs or indels were found in these genomes, we discovered a systematic increase in the copy number of the plasmids carrying mutant sup35-n and sup45-n alleles. We used the qPCR method which confirmed the differences in the relative number of SUP35 and SUP45 gene copies between strains carrying wild-type or mutant alleles of SUP35 and SUP45 genes. Moreover, we compare the number of copies of the SUP35 and SUP45 genes in strains carrying different nonsense mutant variants of these genes as a single chromosomal copy. qPCR results indicate that the number of mutant gene copies is increased compared to the wild-type control. In case of several sup45-n alleles, this was due to a disomy of the entire chromosome II, while for the sup35-218 mutation we observed a local duplication of a segment of chromosome IV containing the SUP35 gene. Taken together, our results indicate that gene amplification is a common mechanism of adaptation to nonsense mutations in release factor genes in yeast.
Collapse
|
2
|
Barbitoff YA, Matveenko AG, Matiiv AB, Maksiutenko EM, Moskalenko SE, Drozdova PB, Polev DE, Beliavskaia AY, Danilov LG, Predeus AV, Zhouravleva GA. Chromosome-level genome assembly and structural variant analysis of two laboratory yeast strains from the Peterhof Genetic Collection lineage. G3-GENES GENOMES GENETICS 2021; 11:6129118. [PMID: 33677552 PMCID: PMC8759820 DOI: 10.1093/g3journal/jkab029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 01/22/2021] [Indexed: 01/23/2023]
Abstract
Thousands of yeast genomes have been sequenced with both traditional and long-read technologies, and multiple observations about modes of genome evolution for both wild and laboratory strains have been drawn from these sequences. In our study, we applied Oxford Nanopore and Illumina technologies to assemble complete genomes of two widely used members of a distinct laboratory yeast lineage, the Peterhof Genetic Collection (PGC), and investigate the structural features of these genomes including transposable element content, copy number alterations, and structural rearrangements. We identified numerous notable structural differences between genomes of PGC strains and the reference S288C strain. We discovered a substantial enrichment of mid-length insertions and deletions within repetitive coding sequences, such as in the SCH9 gene or the NUP100 gene, with possible impact of these variants on protein amyloidogenicity. High contiguity of the final assemblies allowed us to trace back the history of reciprocal unbalanced translocations between chromosomes I, VIII, IX, XI, and XVI of the PGC strains. We show that formation of hybrid alleles of the FLO genes during such chromosomal rearrangements is likely responsible for the lack of invasive growth of yeast strains. Taken together, our results highlight important features of laboratory yeast strain evolution using the power of long-read sequencing.
Collapse
Affiliation(s)
- Yury A Barbitoff
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg 199034, Russia.,Bioinformatics Institute, St. Petersburg 197342, Russia
| | - Andrew G Matveenko
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg 199034, Russia.,Bioinformatics Institute, St. Petersburg 197342, Russia
| | - Anton B Matiiv
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg 199034, Russia.,Bioinformatics Institute, St. Petersburg 197342, Russia
| | - Evgeniia M Maksiutenko
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg 199034, Russia.,St. Petersburg Branch, Vavilov Institute of General Genetics of the Russian Academy of Sciences, St. Petersburg 199034, Russia
| | - Svetlana E Moskalenko
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg 199034, Russia.,St. Petersburg Branch, Vavilov Institute of General Genetics of the Russian Academy of Sciences, St. Petersburg 199034, Russia
| | | | | | - Alexandra Y Beliavskaia
- Department of Invertebrate Zoology, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Lavrentii G Danilov
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg 199034, Russia
| | - Alexander V Predeus
- Bioinformatics Institute, St. Petersburg 197342, Russia.,University of Liverpool, Liverpool, UK, L7 3EA
| | - Galina A Zhouravleva
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg 199034, Russia
| |
Collapse
|
3
|
Powell CE, Du G, Che J, He Z, Donovan KA, Yue H, Wang ES, Nowak RP, Zhang T, Fischer ES, Gray NS. Selective Degradation of GSPT1 by Cereblon Modulators Identified via a Focused Combinatorial Library. ACS Chem Biol 2020; 15:2722-2730. [PMID: 32865967 DOI: 10.1021/acschembio.0c00520] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cereblon (CRBN) is an E3 ligase adapter protein that can be reprogrammed by imide-class compounds such as thalidomide, lenalidomide, and pomalidomide to induce the degradation of neo-substrate proteins. In order to identify additional small molecule CRBN modulators, we implemented a focused combinatorial library approach where we fused an imide-based CRBN-binding pharmacophore to a heterocyclic scaffold, which could be further elaborated. We screened the library for CRBN-dependent antiproliferative activity in the multiple myeloma cell line MM1.S and identified five hit compounds. Quantitative chemical proteomics of hit compounds revealed that they induced selective degradation of GSPT1, a translation termination factor that is currently being explored as a therapeutic target for the treatment of acute myeloid leukemia. Molecular docking studies with CRBN and GSPT1 followed by analogue synthesis identified a possible hydrogen bond interaction with the central pyrimidine ring as a molecular determinant of hit compounds' selectivity. This study demonstrates that a focused combinatorial library design, phenotypic screening, and chemical proteomics can provide a suitable workflow to efficiently identify novel CRBN modulators.
Collapse
Affiliation(s)
- Chelsea E. Powell
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Guangyan Du
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Jianwei Che
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Zhixiang He
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Katherine A. Donovan
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Hong Yue
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Eric S. Wang
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Radosław P. Nowak
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Tinghu Zhang
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Eric S. Fischer
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Nathanael S. Gray
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
| |
Collapse
|
4
|
Matveenko AG, Belousov MV, Bondarev SA, Moskalenko SE, Zhouravleva GA. Identification of new genes that affect [PSI +] prion toxicity in Saccharomyces cerevisiae yeast. Mol Biol 2016. [DOI: 10.1134/s0026893316050113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
5
|
Matveenko AG, Drozdova PB, Belousov MV, Moskalenko SE, Bondarev SA, Barbitoff YA, Nizhnikov AA, Zhouravleva GA. SFP1-mediated prion-dependent lethality is caused by increased Sup35 aggregation and alleviated by Sis1. Genes Cells 2016; 21:1290-1308. [DOI: 10.1111/gtc.12444] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Accepted: 09/14/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Andrew G. Matveenko
- St Petersburg Branch; Vavilov Institute of General Genetics of the Russian Academy of Sciences; St Petersburg Russia
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
- Laboratory of Amyloid Biology; Saint Petersburg State University; St Petersburg Russia
| | - Polina B. Drozdova
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
- Laboratory of Amyloid Biology; Saint Petersburg State University; St Petersburg Russia
| | - Mikhail V. Belousov
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
| | - Svetlana E. Moskalenko
- St Petersburg Branch; Vavilov Institute of General Genetics of the Russian Academy of Sciences; St Petersburg Russia
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
| | - Stanislav A. Bondarev
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
- Laboratory of Amyloid Biology; Saint Petersburg State University; St Petersburg Russia
| | - Yury A. Barbitoff
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
| | - Anton A. Nizhnikov
- St Petersburg Branch; Vavilov Institute of General Genetics of the Russian Academy of Sciences; St Petersburg Russia
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
- All-Russia Research Institute for Agricultural Microbiology; Pushkin St Petersburg Russia
| | - Galina A. Zhouravleva
- Department of Genetics and Biotechnology; Saint Petersburg State University; St Petersburg Russia
- Laboratory of Amyloid Biology; Saint Petersburg State University; St Petersburg Russia
| |
Collapse
|
6
|
Petrova A, Kiktev D, Askinazi O, Chabelskaya S, Moskalenko S, Zemlyanko O, Zhouravleva G. The translation termination factor eRF1 (Sup45p) of Saccharomyces cerevisiae is required for pseudohyphal growth and invasion. FEMS Yeast Res 2015; 15:fov033. [PMID: 26054854 DOI: 10.1093/femsyr/fov033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/26/2015] [Indexed: 01/16/2023] Open
Abstract
Mutations in the essential genes SUP45 and SUP35, encoding yeast translation termination factors eRF1 and eRF3, respectively, lead to a wide range of phenotypes and affect various cell processes. In this work, we show that nonsense and missense mutations in the SUP45, but not the SUP35, gene abolish diploid pseudohyphal and haploid invasive growth. Missense mutations that change phosphorylation sites of Sup45 protein do not affect the ability of yeast strains to form pseudohyphae. Deletion of the C-terminal part of eRF1 did not lead to impairment of filamentation. We show a correlation between the filamentation defect and the budding pattern in sup45 strains. Inhibition of translation with specific antibiotics causes a significant reduction in pseudohyphal growth in the wild-type strain, suggesting a strong correlation between translation and the ability for filamentous growth. Partial restoration of pseudohyphal growth by addition of exogenous cAMP assumes that sup45 mutants are defective in the cAMP-dependent pathway that control filament formation.
Collapse
Affiliation(s)
- Alexandra Petrova
- Department of Genetics and Biotechnology, St Petersburg State University and St Petersburg Branch Vavilov Institute of General Genetics, Russian Academy of Science, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia
| | - Denis Kiktev
- Department of Genetics and Biotechnology, St Petersburg State University and St Petersburg Branch Vavilov Institute of General Genetics, Russian Academy of Science, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia
| | - Olga Askinazi
- Department of Genetics and Biotechnology, St Petersburg State University and St Petersburg Branch Vavilov Institute of General Genetics, Russian Academy of Science, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia
| | - Svetlana Chabelskaya
- Department of Genetics and Biotechnology, St Petersburg State University and St Petersburg Branch Vavilov Institute of General Genetics, Russian Academy of Science, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia
| | - Svetlana Moskalenko
- Department of Genetics and Biotechnology, St Petersburg State University and St Petersburg Branch Vavilov Institute of General Genetics, Russian Academy of Science, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia
| | - Olga Zemlyanko
- Department of Genetics and Biotechnology, St Petersburg State University and St Petersburg Branch Vavilov Institute of General Genetics, Russian Academy of Science, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia
| | - Galina Zhouravleva
- Department of Genetics and Biotechnology, St Petersburg State University and St Petersburg Branch Vavilov Institute of General Genetics, Russian Academy of Science, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia
| |
Collapse
|
7
|
Li X, Rayman JB, Kandel ER, Derkatch IL. Functional role of Tia1/Pub1 and Sup35 prion domains: directing protein synthesis machinery to the tubulin cytoskeleton. Mol Cell 2014; 55:305-18. [PMID: 24981173 DOI: 10.1016/j.molcel.2014.05.027] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 02/19/2014] [Accepted: 05/16/2014] [Indexed: 12/22/2022]
Abstract
Tia1/Pub1 is a stress granule component carrying a Q/N-rich prion domain. We provide direct evidence that Tia1 forms a prion in yeast. Moreover, Tia1/Pub1 acts cooperatively with release factor Sup35/eRF3 to establish a two-protein self-propagating state. This two-protein prion driven by the Q/N-rich prion domains of Sup35 and Tia1/Pub1 can be visualized as distinctive line structures along tubulin cytoskeleton. Furthermore, we find that tubulin-associated complex containing Pub1 and Sup35 oligomers normally exists in yeast, and its assembly depends on prion domains of Pub1 and Sup35. This Sup35/Pub1 complex, which also contains TUB1 mRNA and components of translation machinery, is important for the integrity of the tubulin cytoskeleton: PUB1 disruption and Sup35 depletion from the complex lead to cytoskeletal defects. We propose that the complex is implicated in protein synthesis at the site of microtubule assembly. Thus our study identifies the role for prion domains in the assembly of multiprotein complexes.
Collapse
Affiliation(s)
- Xiang Li
- Department of Neuroscience, College of Physicians and Surgeons of Columbia University, 645 Kolb Research Annex, 1051 Riverside Drive, New York, NY 10032, USA
| | - Joseph B Rayman
- Department of Neuroscience, College of Physicians and Surgeons of Columbia University, 645 Kolb Research Annex, 1051 Riverside Drive, New York, NY 10032, USA
| | - Eric R Kandel
- Department of Neuroscience, College of Physicians and Surgeons of Columbia University, 645 Kolb Research Annex, 1051 Riverside Drive, New York, NY 10032, USA; Department of Psychiatry, College of Physicians and Surgeons of Columbia University, New York State Psychiatric Institute, New York, NY 10032, USA; Kavli Institute for Brain Science, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA; Howard Hughes Medical Institute, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA.
| | - Irina L Derkatch
- Department of Neuroscience, College of Physicians and Surgeons of Columbia University, 645 Kolb Research Annex, 1051 Riverside Drive, New York, NY 10032, USA.
| |
Collapse
|
8
|
Wada M, Ito K. A genetic approach for analyzing the co-operative function of the tRNA mimicry complex, eRF1/eRF3, in translation termination on the ribosome. Nucleic Acids Res 2014; 42:7851-66. [PMID: 24914055 PMCID: PMC4081094 DOI: 10.1093/nar/gku493] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
During termination of translation in eukaryotes, a GTP-binding protein, eRF3, functions within a complex with the tRNA-mimicking protein, eRF1, to decode stop codons. It remains unclear how the tRNA-mimicking protein co-operates with the GTPase and with the functional sites on the ribosome. In order to elucidate the molecular characteristics of tRNA-mimicking proteins involved in stop codon decoding, we have devised a heterologous genetic system in Saccharomyces cerevisiae. We found that eRF3 from Pneumocystis carinii (Pc-eRF3) did not complement depletion of S. cerevisiae eRF3. The strength of Pc-eRF3 binding to Sc-eRF1 depends on the GTP-binding domain, suggesting that defects of the GTPase switch in the heterologous complex causes the observed lethality. We isolated mutants of Pc-eRF3 and Sc-eRF1 that restore cell growth in the presence of Pc-eRF3 as the sole source of eRF3. Mapping of these mutations onto the latest 3D-complex structure revealed that they were located in the binding-interface region between eRF1 and eRF3, as well as in the ribosomal functional sites. Intriguingly, a novel functional site was revealed adjacent to the decoding site of eRF1, on the tip domain that mimics the tRNA anticodon loop. This novel domain likely participates in codon recognition, coupled with the GTPase function.
Collapse
Affiliation(s)
- Miki Wada
- Technical office, The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo 108-8639, Japan Department of Medical Genome Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba, 277-8562, Japan
| | - Koichi Ito
- Department of Medical Genome Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba, 277-8562, Japan
| |
Collapse
|
9
|
Hernández G, Proud CG, Preiss T, Parsyan A. On the Diversification of the Translation Apparatus across Eukaryotes. Comp Funct Genomics 2012; 2012:256848. [PMID: 22666084 PMCID: PMC3359775 DOI: 10.1155/2012/256848] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Accepted: 03/07/2012] [Indexed: 11/21/2022] Open
Abstract
Diversity is one of the most remarkable features of living organisms. Current assessments of eukaryote biodiversity reaches 1.5 million species, but the true figure could be several times that number. Diversity is ingrained in all stages and echelons of life, namely, the occupancy of ecological niches, behavioral patterns, body plans and organismal complexity, as well as metabolic needs and genetics. In this review, we will discuss that diversity also exists in a key biochemical process, translation, across eukaryotes. Translation is a fundamental process for all forms of life, and the basic components and mechanisms of translation in eukaryotes have been largely established upon the study of traditional, so-called model organisms. By using modern genome-wide, high-throughput technologies, recent studies of many nonmodel eukaryotes have unveiled a surprising diversity in the configuration of the translation apparatus across eukaryotes, showing that this apparatus is far from being evolutionarily static. For some of the components of this machinery, functional differences between different species have also been found. The recent research reviewed in this article highlights the molecular and functional diversification the translational machinery has undergone during eukaryotic evolution. A better understanding of all aspects of organismal diversity is key to a more profound knowledge of life.
Collapse
Affiliation(s)
- Greco Hernández
- Division of Basic Research, National Institute for Cancer (INCan), Avenida San Fernando No. 22, Col. Sección XVI, Tlalpan, 14080 Mexico City, Mexico
| | - Christopher G. Proud
- Centre for Biological Sciences, University of Southampton, Life Sciences Building (B85), Southampton SO17 1BJ, UK
| | - Thomas Preiss
- Genome Biology Department, The John Curtin School of Medical Research, The Australian National University, Building 131, Garran Road, Acton, Canberra, ACT 0200, Australia
| | - Armen Parsyan
- Goodman Cancer Centre and Department of Biochemistry, Faculty of Medicine, McGill University, 1160 Pine Avenue West, Montreal, QC, Canada H3A 1A3
- Division of General Surgery, Department of Surgery, Faculty of Medicine, McGill University Health Centre, Royal Victoria Hospital, 687 Pine Avenue West, Montreal, QC, Canada H3A 1A1
| |
Collapse
|
10
|
Gong H, Romanova NV, Allen KD, Chandramowlishwaran P, Gokhale K, Newnam GP, Mieczkowski P, Sherman MY, Chernoff YO. Polyglutamine toxicity is controlled by prion composition and gene dosage in yeast. PLoS Genet 2012; 8:e1002634. [PMID: 22536159 PMCID: PMC3334884 DOI: 10.1371/journal.pgen.1002634] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 02/21/2012] [Indexed: 12/02/2022] Open
Abstract
Polyglutamine expansion causes diseases in humans and other mammals. One example is Huntington's disease. Fragments of human huntingtin protein having an expanded polyglutamine stretch form aggregates and cause cytotoxicity in yeast cells bearing endogenous QN-rich proteins in the aggregated (prion) form. Attachment of the proline(P)-rich region targets polyglutamines to the large perinuclear deposit (aggresome). Aggresome formation ameliorates polyglutamine cytotoxicity in cells containing only the prion form of Rnq1 protein. Here we show that expanded polyglutamines both with (poly-QP) or without (poly-Q) a P-rich stretch remain toxic in the presence of the prion form of translation termination (release) factor Sup35 (eRF3). A Sup35 derivative that lacks the QN-rich domain and is unable to be incorporated into aggregates counteracts cytotoxicity, suggesting that toxicity is due to Sup35 sequestration. Increase in the levels of another release factor, Sup45 (eRF1), due to either disomy by chromosome II containing the SUP45 gene or to introduction of the SUP45-bearing plasmid counteracts poly-Q or poly-QP toxicity in the presence of the Sup35 prion. Protein analysis confirms that polyglutamines alter aggregation patterns of Sup35 and promote aggregation of Sup45, while excess Sup45 counteracts these effects. Our data show that one and the same mode of polyglutamine aggregation could be cytoprotective or cytotoxic, depending on the composition of other aggregates in a eukaryotic cell, and demonstrate that other aggregates expand the range of proteins that are susceptible to sequestration by polyglutamines. Polyglutamine diseases, including Huntington disease, are associated with expansions of polyglutamine tracts, resulting in aggregation of respective proteins. The severity of Huntington disease is controlled by both DNA and non–DNA factors. Mechanisms of such a control are poorly understood. Polyglutamine may sequester other cellular proteins; however, different experimental models have pointed to different sequestered proteins. By using a yeast model, we demonstrate that the mechanism of polyglutamine toxicity is driven by the composition of other (endogenous) aggregates (for example, yeast prions) present in a eukaryotic cell. Although these aggregates do not necessarily cause significant toxicity on their own, they serve as mediators in protein sequestration and therefore determine which specific proteins are to be sequestered by polyglutamines. We also show that polyglutamine deposition into an aggresome, a perinuclear compartment thought to be cytoprotective, fails to ameliorate cytotoxicity in cells with certain compositions of pre-existing aggregates. Finally, we demonstrate that an increase in the dosage of a sequestered protein due to aneuploidy by a chromosome carrying a respective gene may rescue cytotoxicity. Our data shed light on genetic and epigenetic mechanisms modulating polyglutamine cytotoxicity and establish a new approach for identifying potential therapeutic targets through characterization of the endogenous aggregated proteins.
Collapse
Affiliation(s)
- He Gong
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America
| | - Nina V. Romanova
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America
| | - Kim D. Allen
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America
| | | | - Kavita Gokhale
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America
| | - Gary P. Newnam
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America
| | - Piotr Mieczkowski
- School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Michael Y. Sherman
- Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts, United States of America
| | - Yury O. Chernoff
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America
- * E-mail:
| |
Collapse
|
11
|
Kabani M, Melki R. Yeast prions assembly and propagation: contributions of the prion and non-prion moieties and the nature of assemblies. Prion 2011; 5:277-84. [PMID: 22052349 DOI: 10.4161/pri.18070] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Yeast prions are self-perpetuating protein aggregates that are at the origin of heritable and transmissible non-Mendelian phenotypic traits. Among these, [PSI+], [URE3] and [PIN+] are the most well documented prions and arise from the assembly of Sup35p, Ure2p and Rnq1p, respectively, into insoluble fibrillar assemblies. Fibril assembly depends on the presence of N- or C-terminal prion domains (PrDs) which are not homologous in sequence but share unusual amino-acid compositions, such as enrichment in polar residues (glutamines and asparagines) or the presence of oligopeptide repeats. Purified PrDs form amyloid fibrils that can convert prion-free cells to the prion state upon transformation. Nonetheless, isolated PrDs and full-length prion proteins have different aggregation, structural and infectious properties. In addition, mutations in the "non-prion" domains (non-PrDs) of Sup35p, Ure2p and Rnq1p were shown to affect their prion properties in vitro and in vivo. Despite these evidences, the implication of the functional non-PrDs in fibril assembly and prion propagation has been mostly overlooked. In this review, we discuss the contribution of non-PrDs to prion assemblies, and the structure-function relationship in prion infectivity in the light of recent findings on Sup35p and Ure2p assembly into infectious fibrils from our laboratory and others.
Collapse
Affiliation(s)
- Mehdi Kabani
- Laboratoire d'Enzymologie et Biochimie Structurales, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France.
| | | |
Collapse
|
12
|
Whibley AC, Plagnol V, Tarpey PS, Abidi F, Fullston T, Choma MK, Boucher CA, Shepherd L, Willatt L, Parkin G, Smith R, Futreal PA, Shaw M, Boyle J, Licata A, Skinner C, Stevenson RE, Turner G, Field M, Hackett A, Schwartz CE, Gecz J, Stratton MR, Raymond FL. Fine-scale survey of X chromosome copy number variants and indels underlying intellectual disability. Am J Hum Genet 2010; 87:173-88. [PMID: 20655035 DOI: 10.1016/j.ajhg.2010.06.017] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Revised: 06/14/2010] [Accepted: 06/21/2010] [Indexed: 11/16/2022] Open
Abstract
Copy number variants and indels in 251 families with evidence of X-linked intellectual disability (XLID) were investigated by array comparative genomic hybridization on a high-density oligonucleotide X chromosome array platform. We identified pathogenic copy number variants in 10% of families, with mutations ranging from 2 kb to 11 Mb in size. The challenge of assessing causality was facilitated by prior knowledge of XLID-associated genes and the ability to test for cosegregation of variants with disease through extended pedigrees. Fine-scale analysis of rare variants in XLID families leads us to propose four additional genes, PTCHD1, WDR13, FAAH2, and GSPT2, as candidates for XLID causation and the identification of further deletions and duplications affecting X chromosome genes but without apparent disease consequences. Breakpoints of pathogenic variants were characterized to provide insight into the underlying mutational mechanisms and indicated a predominance of mitotic rather than meiotic events. By effectively bridging the gap between karyotype-level investigations and X chromosome exon resequencing, this study informs discussion of alternative mutational mechanisms, such as noncoding variants and non-X-linked disease, which might explain the shortfall of mutation yield in the well-characterized International Genetics of Learning Disability (IGOLD) cohort, where currently disease remains unexplained in two-thirds of families.
Collapse
Affiliation(s)
- Annabel C Whibley
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge CB2 0XY, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Zhouravleva GA, Inge-Vechtomov SG. The origin of novel proteins by gene duplication: Common aspects in the evolution of color-sensitive pigment proteins and translation termination factors. Mol Biol 2009. [DOI: 10.1134/s0026893309050021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
14
|
Tarasov OV, Zhuravleva GA, Abramson NI. Evaluation of the gene encoding translation termination factor eRF3 as a possible phylogenetic marker. Mol Biol 2008. [DOI: 10.1134/s0026893308060022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
15
|
Kodama H, Ito K, Nakamura Y. The role of N-terminal domain of translational release factor eRF3 for the control of functionality and stability in S. cerevisiae. Genes Cells 2007; 12:639-50. [PMID: 17535254 DOI: 10.1111/j.1365-2443.2007.01082.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Translation termination in eukaryotes is mediated by two eukaryotic release factors, eRF1 and eRF3. eRF1 recognizes all three stop codons and induces polypeptide release, while eRF3 binds to eRF1 and participates in translation termination though the regulatory role of eRF3 is still unknown. Importantly, eRF3 interacts with various proteins of distinct biological functions. Here, we investigated the effect of these binding factors on functionality and stability of eRF3 using a temperature-sensitive mutant eRF3ts, which is susceptible to factor binding to change the growth phenotype or cellular protein level. Of factors tested, Itt1 over-expression and Sla1 knockout severely impaired viability of eRF3ts cell and its protein abundance in permissive and semipermissive conditions. Sla1 over-expression reversed the phenotype. It is reported that Itt1 and Sla1 bind to the N-terminal extension domain (NED) of eRF3, unlike the other no-effect factors that bind to the C-terminal domain (CTD). Although NED itself is dispensable, NED-less eRF3ts altered in the stability and functionality. Moreover, Itt1-induced eRF3ts lethality was significantly restored by pep4, prb1 and prc1 knockouts that are defective in vacuolar proteolysis. These findings suggest that NED functions to switch the functional mode of eRF3 depending on the nature of binding factors.
Collapse
Affiliation(s)
- Hiroyuki Kodama
- Department of Basic Medical Sciences, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | | | | |
Collapse
|
16
|
Volkov K, Osipov K, Valouev I, Inge-Vechtomov S, Mironova L. N-terminal extension ofSaccharomyces cerevisiaetranslation termination factor eRF3 influences the suppression efficiency ofsup35mutations. FEMS Yeast Res 2007; 7:357-65. [PMID: 17302942 DOI: 10.1111/j.1567-1364.2006.00176.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The eukaryotic translation termination factor eRF3 stimulates release of nascent polypeptides from the ribosome in a GTP-dependent manner. In most eukaryotes studied, eRF3 consists of an essential, conserved C-terminal domain and a nonessential, nonconserved N-terminal extension. However, in some species, this extension is required for efficient termination. Our data show that the N-terminal extension of Saccharomyces cerevisiae eRF3 also participates in regulation of termination efficiency, but acts as a negative factor, increasing nonsense suppression efficiency in sup35 mutants containing amino acid substitutions in the C-terminal domain of the protein.
Collapse
Affiliation(s)
- Kirill Volkov
- Department of Genetics, St Petersburg State University, St Petersburg, Russia
| | | | | | | | | |
Collapse
|
17
|
Kiktev D, Vechtomov SI, Zhouravleva G. Prion-dependent lethality of sup45 mutants in Saccharomyces cerevisiae. Prion 2007; 1:136-43. [PMID: 19164896 DOI: 10.4161/pri.1.2.4533] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
In yeast Saccharomyces cerevisiae translation termination factors eRF1 (Sup45) and eRF3 (Sup35) are encoded by the essential genes SUP45 and SUP35 respectively. Heritable aggregation of Sup35 results in formation of the yeast prion [PSI(+)]. It is known that combination of [PSI(+)] with some mutant alleles of the SUP35 or SUP45 genes in one and the same haploid yeast cell causes synthetic lethality. In this study, we perform detailed analysis of synthetic lethality between various sup45 nonsense and missense mutations on one hand, and different variants of [PSI(+)] on the other hand. Synthetic lethality with sup45 mutations was detected for [PSI(+)] variants of different stringencies. Moreover, we demonstrate for the first time that in some combinations, synthetic lethality is dominant and occurs at the postzygotic stage after only a few cell divisions. The tRNA suppressor SUQ5 counteracts the prion-dependent lethality of the nonsense alleles but not of the missense alleles of SUP45, indicating that the lethal effect is due to the depletion of Sup45. Synthetic lethality is also suppressed in the presence of the C-proximal fragment of Sup35 (Sup35C) that lacks the prion domain and cannot be included into the prion aggregates. Remarkably, the production of Sup35C in a sup45 mutant strain is also accompanied by an increase in the Sup45 levels, suggesting that translationally active Sup35 up-regulates Sup45 or protects it from degradation.
Collapse
Affiliation(s)
- Denis Kiktev
- Department of Genetics and Breeding, St Petersburg State University, St. Petersburg, Russia
| | | | | |
Collapse
|
18
|
Zhouravleva GA, Zemlyanko OM, Le Goff C, Petrova AV, Philippe M, Inge-Vechtomov SG. Conservation of the MC domains in eukaryotic release factor eRF3. RUSS J GENET+ 2007. [DOI: 10.1134/s102279540701005x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
19
|
Aksenova AY, Volkov KV, Rovinsky NS, Svitin AV, Mironova LN. Phenotypic expression of epigenetic determinant [ISP +] in Saccharomyces cerevisiae depends on the combination of sup35 and sup45 mutations. Mol Biol 2006. [DOI: 10.1134/s0026893306050104] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
20
|
Chauvin C, Salhi S, Le Goff C, Viranaicken W, Diop D, Jean-Jean O. Involvement of human release factors eRF3a and eRF3b in translation termination and regulation of the termination complex formation. Mol Cell Biol 2005; 25:5801-11. [PMID: 15987998 PMCID: PMC1168810 DOI: 10.1128/mcb.25.14.5801-5811.2005] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
eRF3 is a GTPase associated with eRF1 in a complex that mediates translation termination in eukaryotes. In mammals, two genes encode two distinct forms of eRF3, eRF3a and eRF3b, which differ in their N-terminal domains. Both bind eRF1 and stimulate its release activity in vitro. However, whether both proteins can function as termination factors in vivo has not been determined. In this study, we used short interfering RNAs to examine the effect of eRF3a and eRF3b depletion on translation termination efficiency in human cells. By measuring the readthrough at a premature nonsense codon in a reporter mRNA, we found that eRF3a silencing induced an important increase in readthrough whereas eRF3b silencing had no significant effect. We also found that eRF3a depletion reduced the intracellular level of eRF1 protein by affecting its stability. In addition, we showed that eRF3b overexpression alleviated the effect of eRF3a silencing on readthrough and on eRF1 cellular levels. These results suggest that eRF3a is the major factor acting in translation termination in mammals and clearly demonstrate that eRF3b can substitute for eRF3a in this function. Finally, our data indicate that the expression level of eRF3a controls the formation of the termination complex by modulating eRF1 protein stability.
Collapse
Affiliation(s)
- Céline Chauvin
- Unité de Biochimie Cellulaire, UMR 7098 CNRS-Université Paris 6, 9 quai Saint-Bernard, 75252 Paris Cedex 05, France
| | | | | | | | | | | |
Collapse
|
21
|
Le Roy F, Salehzada T, Bisbal C, Dougherty JP, Peltz SW. A newly discovered function for RNase L in regulating translation termination. Nat Struct Mol Biol 2005; 12:505-12. [PMID: 15908960 DOI: 10.1038/nsmb944] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2004] [Accepted: 04/21/2005] [Indexed: 11/08/2022]
Abstract
The antiviral and antiproliferative effects of interferons are mediated in part by the 2'-5' oligoadenylate-RNase L RNA decay pathway. RNase L is an endoribonuclease that requires 2'-5' oligoadenylates to cleave single-stranded RNA. In this report we present evidence demonstrating a role for RNase L in translation. We identify and characterize the human translation termination factor eRF3/GSPT1 as an interacting partner of RNase L. We show that interaction of eRF3 with RNase L leads to both increased translation readthrough efficiency at premature termination codons and increased +1 frameshift efficiency at the antizyme +1 frameshift site. On the basis of our results, we present a model describing how RNase L is involved in regulating gene expression by modulating the translation termination process.
Collapse
Affiliation(s)
- Florence Le Roy
- Department of Molecular Genetics, Microbiology & Immunology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA
| | | | | | | | | |
Collapse
|
22
|
Janzen DM, Geballe AP. The effect of eukaryotic release factor depletion on translation termination in human cell lines. Nucleic Acids Res 2004; 32:4491-502. [PMID: 15326224 PMCID: PMC516063 DOI: 10.1093/nar/gkh791] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Two competing events, termination and readthrough (or nonsense suppression), can occur when a stop codon reaches the A-site of a translating ribosome. Translation termination results in hydrolysis of the final peptidyl-tRNA bond and release of the completed nascent polypeptide. Alternatively, readthrough, in which the stop codon is erroneously decoded by a suppressor or near cognate transfer RNA (tRNA), results in translation past the stop codon and production of a protein with a C-terminal extension. The relative frequency of termination versus readthrough is determined by parameters such as the stop codon nucleotide context, the activities of termination factors and the abundance of suppressor tRNAs. Using a sensitive and versatile readthrough assay in conjunction with RNA interference technology, we assessed the effects of depleting eukaryotic releases factors 1 and 3 (eRF1 and eRF3) on the termination reaction in human cell lines. Consistent with the established role of eRF1 in triggering peptidyl-tRNA hydrolysis, we found that depletion of eRF1 enhances readthrough at all three stop codons in 293 cells and HeLa cells. The role of eRF3 in eukarytotic translation termination is less well understood as its overexpression has been shown to have anti-suppressor effects in yeast but not mammalian systems. We found that depletion of eRF3 has little or no effect on readthrough in 293 cells but does increase readthrough at all three stop codons in HeLa cells. These results support a direct role for eRF3 in translation termination in higher eukaryotes and also highlight the potential for differences in the abundance or activity of termination factors to modulate the balance of termination to readthrough reactions in a cell-type-specific manner.
Collapse
Affiliation(s)
- Deanna M Janzen
- Division of Human Biology, Fred Hutchinson Cancer Research Center, PO Box 19024, 1100 Fairview Avenue North-C2-023, Seattle, WA 98109-1024, USA
| | | |
Collapse
|
23
|
Moskalenko SE, Chabelskaya SV, Inge-Vechtomov SG, Philippe M, Zhouravleva GA. Viable nonsense mutants for the essential gene SUP45 of Saccharomyces cerevisiae. BMC Mol Biol 2003; 4:2. [PMID: 12589713 PMCID: PMC150568 DOI: 10.1186/1471-2199-4-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2002] [Accepted: 02/10/2003] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Termination of protein synthesis in eukaryotes involves at least two polypeptide release factors (eRFs) - eRF1 and eRF3. The highly conserved translation termination factor eRF1 in Saccharomyces cerevisiae is encoded by the essential gene SUP45. RESULTS We have isolated five sup45-n (n from nonsense) mutations that cause nonsense substitutions in the following amino acid positions of eRF1: Y53 --> UAA, E266 --> UAA, L283 --> UAA, L317 --> UGA, E385 --> UAA. We found that full-length eRF1 protein is present in all mutants, although in decreased amounts. All mutations are situated in a weak termination context. All these sup45-n mutations are viable in different genetic backgrounds, however their viability increases after growth in the absence of wild-type allele. Any of sup45-n mutations result in temperature sensitivity (37 degrees C). Most of the sup45-n mutations lead to decreased spore viability and spores bearing sup45-n mutations are characterized by limited budding after germination leading to formation of microcolonies of 4-20 cells. CONCLUSIONS Nonsense mutations in the essential gene SUP45 can be isolated in the absence of tRNA nonsense suppressors.
Collapse
Affiliation(s)
- Svetlana E Moskalenko
- Université de Rennes 1, CNRS UMR 6061, IFR 97, 2 av. Pr. Léon Bernard 35043 Rennes Cedex, France
- Department of Genetics, St Petersburg State University, Universitetskaya emb. 7/1, 199034, St Petersburg, Russia
| | - Svetlana V Chabelskaya
- Université de Rennes 1, CNRS UMR 6061, IFR 97, 2 av. Pr. Léon Bernard 35043 Rennes Cedex, France
- Department of Genetics, St Petersburg State University, Universitetskaya emb. 7/1, 199034, St Petersburg, Russia
| | - Sergei G Inge-Vechtomov
- Department of Genetics, St Petersburg State University, Universitetskaya emb. 7/1, 199034, St Petersburg, Russia
| | - Michel Philippe
- Université de Rennes 1, CNRS UMR 6061, IFR 97, 2 av. Pr. Léon Bernard 35043 Rennes Cedex, France
| | - Galina A Zhouravleva
- Université de Rennes 1, CNRS UMR 6061, IFR 97, 2 av. Pr. Léon Bernard 35043 Rennes Cedex, France
- Department of Genetics, St Petersburg State University, Universitetskaya emb. 7/1, 199034, St Petersburg, Russia
| |
Collapse
|