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• W1976886796 abstract "In bacterial 16S rRNAs, methylated nucleosides are clustered within the decoding center, and these nucleoside modifications are thought to modulate translational fidelity. The N(4), 2'-O-dimethylcytidine (m(4)Cm) at position 1402 of the Escherichia coli 16S rRNA directly interacts with the P-site codon of the mRNA. The biogenesis and function of this modification remain unclear. We have identified two previously uncharacterized genes in E. coli that are required for m(4)Cm formation. mraW (renamed rsmH) and yraL (renamed rsmI) encode methyltransferases responsible for the N(4) and 2'-O-methylations of C1402, respectively. Recombinant RsmH and RsmI proteins employed the 30S subunit (not the 16S rRNA) as a substrate to reconstitute m(4)Cm1402 in the presence of S-adenosylmethionine (Ado-Met) as the methyl donor, suggesting that m(4)Cm1402 is formed at a late step during 30S assembly in the cell. A luciferase reporter assay indicated that the lack of N(4) methylation of C1402 increased the efficiency of non-AUG initiation and decreased the rate of UGA read-through. These results suggest that m(4)Cm1402 plays a role in fine-tuning the shape and function of the P-site, thus increasing decoding fidelity." @default.
• W1976886796 created "2016-06-24" @default.
• W1976886796 creator A5001653266 @default.
• W1976886796 creator A5056761543 @default.
• W1976886796 date "2009-12-03" @default.
• W1976886796 modified "2023-10-14" @default.
• W1976886796 title "Fine-tuning of the ribosomal decoding center by conserved methyl-modifications in the Escherichia coli 16S rRNA" @default.
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• W1976886796 doi "https://doi.org/10.1093/nar/gkp1073" @default.
• W1976886796 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2831307" @default.
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