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!align=left |Citation | |||
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'''Persson, BC, Jäger, G and Gustafsson, C''' (1997) The spoU gene of Escherichia coli, the fourth gene of the spoT operon, is essential for tRNA (Gm18) 2'-O-methyltransferase activity. ''Nucleic Acids Res.'' '''25''':4093-7 | |||
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!align=left |Abstract | |||
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We have evidence that the open reading frame previously denoted spoU is necessary for tRNA (Gm18) 2'-O-methyltransferase activity. The spoU gene is located in the gmk-rpoZ-spoT-spoU-recG operon at 82 minutes on the Escherichia coli chromosome. The deduced amino acid sequence of spoU shows strong similarities to previously characterized 2'-O-methyltransferases. Comparison of the nucleoside modification pattern of hydrolyzed tRNA, 16S rRNA and 23S rRNA from wild-type and spoU null mutants showed that the modified nucleoside 2'-O-methylguanosine (Gm), present in a subset of E. coli tRNAs at residue 18, is completely absent in the spoU mutant, suggesting that spoU encodes tRNA (Gm18) 2'-O-methyltransferase. Nucleoside modification of 16S and 23S rRNA was unaffected in the spoU mutant. Insertions in the downstream recG gene did not affect RNA modification. Absence of Gm18 in tRNA does not influence growth rate under the tested conditions and does not interfere with activity of the SupF amber suppressor, a suppressor tRNA that normally has the Gm18 modification. We suggest that the spoU gene be renamed trmH (tRNA methylation). | |||
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!align=left |Links | |||
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[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=9321663 PubMed] [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC146995 PMC146995] | |||
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| | !align=left |Keywords | ||
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|- | Amino Acid Sequence; Escherichia coli/genetics; Genes, Bacterial; Genes, Suppressor; Operon; Pyrophosphatases/genetics; RNA, Transfer/genetics; RNA, Transfer, Tyr/metabolism; Sequence Homology; tRNA Methyltransferases/chemistry; tRNA Methyltransferases/genetics; tRNA Methyltransferases/metabolism | ||
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==Significance {{HelpIcon|Help:Literature}} == | ==Significance {{HelpIcon|Help:Literature}} == | ||
{{LitSignificance}} | {{LitSignificance}} | ||
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==Annotations {{HelpIcon|Help:Literature}}== | ==Annotations {{HelpIcon|Help:Literature}}== | ||
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==EcoliWiki Links {{HelpIcon|Help:Literature}} == | ==EcoliWiki Links {{HelpIcon|Help:Literature}} == | ||
Latest revision as of 04:58, 15 September 2013
| Citation |
Persson, BC, Jäger, G and Gustafsson, C (1997) The spoU gene of Escherichia coli, the fourth gene of the spoT operon, is essential for tRNA (Gm18) 2'-O-methyltransferase activity. Nucleic Acids Res. 25:4093-7 |
|---|---|
| Abstract |
We have evidence that the open reading frame previously denoted spoU is necessary for tRNA (Gm18) 2'-O-methyltransferase activity. The spoU gene is located in the gmk-rpoZ-spoT-spoU-recG operon at 82 minutes on the Escherichia coli chromosome. The deduced amino acid sequence of spoU shows strong similarities to previously characterized 2'-O-methyltransferases. Comparison of the nucleoside modification pattern of hydrolyzed tRNA, 16S rRNA and 23S rRNA from wild-type and spoU null mutants showed that the modified nucleoside 2'-O-methylguanosine (Gm), present in a subset of E. coli tRNAs at residue 18, is completely absent in the spoU mutant, suggesting that spoU encodes tRNA (Gm18) 2'-O-methyltransferase. Nucleoside modification of 16S and 23S rRNA was unaffected in the spoU mutant. Insertions in the downstream recG gene did not affect RNA modification. Absence of Gm18 in tRNA does not influence growth rate under the tested conditions and does not interfere with activity of the SupF amber suppressor, a suppressor tRNA that normally has the Gm18 modification. We suggest that the spoU gene be renamed trmH (tRNA methylation). |
| Links | |
| Keywords |
Amino Acid Sequence; Escherichia coli/genetics; Genes, Bacterial; Genes, Suppressor; Operon; Pyrophosphatases/genetics; RNA, Transfer/genetics; RNA, Transfer, Tyr/metabolism; Sequence Homology; tRNA Methyltransferases/chemistry; tRNA Methyltransferases/genetics; tRNA Methyltransferases/metabolism |
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