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2021
Li G, Eriani G, Wang E D, Zhou X L
Distinct pathogenic mechanisms of various RARS1 mutations in Pelizaeus-Merzbacher-like disease Article de journal
Dans: Sci China Life Sci, vol. 64, no. 10, p. 1645-1660, 2021, ISBN: 33515434, (1869-1889 (Electronic) 1674-7305 (Linking) Journal Article).
Résumé | Liens | BibTeX | Étiquettes: aminoacyl-tRNA synthetase (aaRS), central nervous system (CNS), ERIANI, Protein Biosynthesis, translation initiation, tRNA, Unité ARN
@article{,
title = {Distinct pathogenic mechanisms of various RARS1 mutations in Pelizaeus-Merzbacher-like disease},
author = {G Li and G Eriani and E D Wang and X L Zhou},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=33515434},
doi = {10.1007/s11427-020-1838-2},
isbn = {33515434},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Sci China Life Sci},
volume = {64},
number = {10},
pages = {1645-1660},
abstract = {Mutations of the genes encoding aminoacyl-tRNA synthetases are highly associated with various central nervous system disorders. Recurrent mutations, including c.5A>G, p.D2G; c.1367C>T, p.S456L; c.1535G>A, p.R512Q and c.1846_1847del, p. Y616Lfs*6 of RARS1 gene, which encodes two forms of human cytoplasmic arginyl-tRNA synthetase (hArgRS), are linked to Pelizaeus-Merzbacher-like disease (PMLD) with unclear pathogenesis. Among these mutations, c.5A>G is the most extensively reported mutation, leading to a p.D2G mutation in the N-terminal extension of the long-form hArgRS. Here, we showed the detrimental effects of R512Q substitution and DeltaC mutations on the structure and function of hArgRS, while the most frequent mutation c.5A>G, p.D2G acted in a different manner without impairing hArgRS activity. The nucleotide substitution c.5A>G reduced translation of hArgRS mRNA, and an upstream open reading frame contributed to the suppressed translation of the downstream main ORF. Taken together, our results elucidated distinct pathogenic mechanisms of various RARS1 mutations in PMLD.},
note = {1869-1889 (Electronic)
1674-7305 (Linking)
Journal Article},
keywords = {aminoacyl-tRNA synthetase (aaRS), central nervous system (CNS), ERIANI, Protein Biosynthesis, translation initiation, tRNA, Unité ARN},
pubstate = {published},
tppubtype = {article}
}
Mutations of the genes encoding aminoacyl-tRNA synthetases are highly associated with various central nervous system disorders. Recurrent mutations, including c.5A>G, p.D2G; c.1367C>T, p.S456L; c.1535G>A, p.R512Q and c.1846_1847del, p. Y616Lfs*6 of RARS1 gene, which encodes two forms of human cytoplasmic arginyl-tRNA synthetase (hArgRS), are linked to Pelizaeus-Merzbacher-like disease (PMLD) with unclear pathogenesis. Among these mutations, c.5A>G is the most extensively reported mutation, leading to a p.D2G mutation in the N-terminal extension of the long-form hArgRS. Here, we showed the detrimental effects of R512Q substitution and DeltaC mutations on the structure and function of hArgRS, while the most frequent mutation c.5A>G, p.D2G acted in a different manner without impairing hArgRS activity. The nucleotide substitution c.5A>G reduced translation of hArgRS mRNA, and an upstream open reading frame contributed to the suppressed translation of the downstream main ORF. Taken together, our results elucidated distinct pathogenic mechanisms of various RARS1 mutations in PMLD.
Hayek H, Gross L, Janvier A, Schaeffer L, Martin F, Eriani G, Allmang C
eIF3 interacts with histone H4 messenger RNA to regulate its translation Article de journal
Dans: J Biol Chem, vol. 296, p. 100578, 2021, ISBN: 33766559, (1083-351X (Electronic) 0021-9258 (Linking) Journal Article).
Résumé | Liens | BibTeX | Étiquettes: ERIANI, eukaryotic initiation factor, histone mRNA, protein synthesis, RNA protein interaction, RNA structure, translation initiation, translation regulation
@article{Hayek2021,
title = {eIF3 interacts with histone H4 messenger RNA to regulate its translation},
author = {H Hayek and L Gross and A Janvier and L Schaeffer and F Martin and G Eriani and C Allmang},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=33766559},
doi = {10.1016/j.jbc.2021.100578},
isbn = {33766559},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {J Biol Chem},
volume = {296},
pages = {100578},
abstract = {In eukaryotes, various alternative translation initiation mechanisms have been unveiled for the translation of specific mRNAs. Some do not conform to the conventional scanning-initiation model. Translation initiation of histone H4 mRNA combines both canonical (cap-dependent) and viral initiation strategies (no-scanning, internal recruitment of initiation factors). Specific H4 mRNA structures tether the translation machinery directly onto the initiation codon and allow massive production of histone H4 during the S phase of the cell cycle. The human eukaryotic translation initiation factor 3 (eIF3), composed of 13 subunits (a-m), was shown to selectively recruit and control the expression of several cellular mRNAs. Whether eIF3 mediates H4 mRNA translation remains to be elucidated. Here, we report that eIF3 binds to a stem-loop structure (eIF3-BS) located in the coding region of H4 mRNA. Combining cross-linking and ribonucleoprotein immunoprecipitation experiments in vivo and in vitro, we also found that eIF3 binds to H1, H2A, H2B and H3 histone mRNAs. We identified direct contacts between eIF3c, d, e, g subunits and histone mRNAs but observed distinct interaction patterns to each histone mRNA. Our results show that eIF3 depletion in vivo reduces histone mRNA binding and modulates histone neosynthesis, suggesting that synthesis of histones is sensitive to the levels of eIF3. Thus, we provide evidence that eIF3 acts as a regulator of histone translation.},
note = {1083-351X (Electronic)
0021-9258 (Linking)
Journal Article},
keywords = {ERIANI, eukaryotic initiation factor, histone mRNA, protein synthesis, RNA protein interaction, RNA structure, translation initiation, translation regulation},
pubstate = {published},
tppubtype = {article}
}
In eukaryotes, various alternative translation initiation mechanisms have been unveiled for the translation of specific mRNAs. Some do not conform to the conventional scanning-initiation model. Translation initiation of histone H4 mRNA combines both canonical (cap-dependent) and viral initiation strategies (no-scanning, internal recruitment of initiation factors). Specific H4 mRNA structures tether the translation machinery directly onto the initiation codon and allow massive production of histone H4 during the S phase of the cell cycle. The human eukaryotic translation initiation factor 3 (eIF3), composed of 13 subunits (a-m), was shown to selectively recruit and control the expression of several cellular mRNAs. Whether eIF3 mediates H4 mRNA translation remains to be elucidated. Here, we report that eIF3 binds to a stem-loop structure (eIF3-BS) located in the coding region of H4 mRNA. Combining cross-linking and ribonucleoprotein immunoprecipitation experiments in vivo and in vitro, we also found that eIF3 binds to H1, H2A, H2B and H3 histone mRNAs. We identified direct contacts between eIF3c, d, e, g subunits and histone mRNAs but observed distinct interaction patterns to each histone mRNA. Our results show that eIF3 depletion in vivo reduces histone mRNA binding and modulates histone neosynthesis, suggesting that synthesis of histones is sensitive to the levels of eIF3. Thus, we provide evidence that eIF3 acts as a regulator of histone translation.
2020
Despons L, Martin F
How Many Messenger RNAs Can Be Translated by the START Mechanism? Article de journal
Dans: International Journal of Molecular Sciences, vol. 21, no. 21, p. 8373, 2020.
Résumé | Liens | BibTeX | Étiquettes: ERIANI, LESCURE, mRNA, Ribosome, secondary structures, START, translation initiation, Unité ARN
@article{Despons2020,
title = {How Many Messenger RNAs Can Be Translated by the START Mechanism? },
author = {L Despons and F Martin
},
url = {https://pubmed.ncbi.nlm.nih.gov/33171614/},
doi = {10.3390/ijms21218373 },
year = {2020},
date = {2020-11-01},
journal = {International Journal of Molecular Sciences},
volume = {21},
number = {21},
pages = {8373},
abstract = {Translation initiation is a key step in the protein synthesis stage of the gene expression pathway of all living cells. In this important process, ribosomes have to accurately find the AUG start codon in order to ensure the integrity of the proteome. "Structure Assisted RNA Translation", or "START", has been proposed to use stable secondary structures located in the coding sequence to augment start site selection by steric hindrance of the progression of pre-initiation complex on messenger RNA. This implies that such structures have to be located downstream and at on optimal distance from the AUG start codon (i.e., downstream nucleotide +16). In order to assess the importance of the START mechanism in the overall mRNA translation process, we developed a bioinformatic tool to screen coding sequences for such stable structures in a 50 nucleotide-long window spanning the nucleotides from +16 to +65. We screened eight bacterial genomes and six eukaryotic genomes. We found stable structures in 0.6-2.5% of eukaryotic coding sequences. Among these, approximately half of them were structures predicted to form G-quadruplex structures. In humans, we selected 747 structures. In bacteria, the coding sequences from Gram-positive bacteria contained 2.6-4.2% stable structures, whereas the structures were less abundant in Gram-negative bacteria (0.2-2.7%). In contrast to eukaryotes, putative G-quadruplex structures are very rare in the coding sequence of bacteria. Altogether, our study reveals that the START mechanism seems to be an ancient strategy to facilitate the start codon recognition that is used in different kingdoms of life. },
keywords = {ERIANI, LESCURE, mRNA, Ribosome, secondary structures, START, translation initiation, Unité ARN},
pubstate = {published},
tppubtype = {article}
}
Translation initiation is a key step in the protein synthesis stage of the gene expression pathway of all living cells. In this important process, ribosomes have to accurately find the AUG start codon in order to ensure the integrity of the proteome. "Structure Assisted RNA Translation", or "START", has been proposed to use stable secondary structures located in the coding sequence to augment start site selection by steric hindrance of the progression of pre-initiation complex on messenger RNA. This implies that such structures have to be located downstream and at on optimal distance from the AUG start codon (i.e., downstream nucleotide +16). In order to assess the importance of the START mechanism in the overall mRNA translation process, we developed a bioinformatic tool to screen coding sequences for such stable structures in a 50 nucleotide-long window spanning the nucleotides from +16 to +65. We screened eight bacterial genomes and six eukaryotic genomes. We found stable structures in 0.6-2.5% of eukaryotic coding sequences. Among these, approximately half of them were structures predicted to form G-quadruplex structures. In humans, we selected 747 structures. In bacteria, the coding sequences from Gram-positive bacteria contained 2.6-4.2% stable structures, whereas the structures were less abundant in Gram-negative bacteria (0.2-2.7%). In contrast to eukaryotes, putative G-quadruplex structures are very rare in the coding sequence of bacteria. Altogether, our study reveals that the START mechanism seems to be an ancient strategy to facilitate the start codon recognition that is used in different kingdoms of life.
2008
Simonetti A, Marzi S, Myasnikov A, Fabbretti A, Yusupov M, Gualerzi C, Klaholz B
2008.
Liens | BibTeX | Étiquettes: filter-binding assay, IF1, IF2, initiation factor purification, Ribosome, ROMBY, Thermus thermophilus, translation initiation, Unité ARN
@misc{,
title = {Purification of T. thermophilus translation initiation factors and characterization of the corresponding ribosome complexes by filter-binding assays},
author = {A Simonetti and S Marzi and A Myasnikov and A Fabbretti and M Yusupov and C Gualerzi and B Klaholz},
url = {https://protocolexchange.researchsquare.com/article/nprot-477/v1},
doi = {10.1038/nprot.2008.130},
year = {2008},
date = {2008-01-01},
keywords = {filter-binding assay, IF1, IF2, initiation factor purification, Ribosome, ROMBY, Thermus thermophilus, translation initiation, Unité ARN},
pubstate = {published},
tppubtype = {misc}
}
