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• W2066249088 abstract "Methylation at the 5-position of cytosine [m(5)C (5-methylcytidine)] occurs at three RNA nucleotides in Escherichia coli. All these modifications are at highly conserved nucleotides in the rRNAs, and each is catalyzed by its own m(5)C methyltransferase enzyme. Two of the enzymes, RsmB and RsmF, are already known and methylate 16S rRNA at nucleotides C967 and C1407, respectively. Here, we report the identity of the third E. coli m(5)C methyltransferase. Analysis of rRNAs by matrix-assisted laser desorption/ionization mass spectrometry showed that inactivation of the yccW gene leads to loss of m(5)C methylation at nucleotide 1962 in E. coli 23S rRNA. This methylation is restored by complementing the knockout strain with a plasmid-encoded copy of the yccW gene. Purified recombinant YccW protein retains its specificity for C1962 in vitro and methylates naked 23S rRNA isolated from the yccW knockout strain. However, YccW does not methylate assembled 50S subunits, and this is somewhat surprising as the published crystal structures show nucleotide C1962 to be fully accessible at the subunit interface. YccW-directed methylation at nucleotide C1962 is conserved in bacteria, and loss of this methylation in E. coli marginally reduces its growth rate. YccW had previously eluded identification because it displays only limited sequence similarity to the m(5)C methyltransferases RsmB and RsmF and is in fact more similar to known m(5)U (5-methyluridine) RNA methyltransferases. In keeping with the previously proposed nomenclature system for bacterial rRNA methyltransferases, yccW is now designated as the rRNA large subunit methyltransferase gene rlmI." @default.
• W2066249088 created "2016-06-24" @default.
• W2066249088 creator A5000130184 @default.
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• W2066249088 date "2008-11-01" @default.
• W2066249088 modified "2023-10-09" @default.
• W2066249088 title "YccW is the m5C Methyltransferase Specific for 23S rRNA Nucleotide 1962" @default.
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• W2066249088 doi "https://doi.org/10.1016/j.jmb.2008.08.061" @default.
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