PMID:9748462
| Citation |
Lu, Q and Inouye, M (1998) The gene for 16S rRNA methyltransferase (ksgA) functions as a multicopy suppressor for a cold-sensitive mutant of era, an essential RAS-like GTP-binding protein in Escherichia coli. J. Bacteriol. 180:5243-6 |
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| Abstract |
Era, a Ras-like GTP-binding protein in Escherichia coli, has been shown to be essential for growth. However, its cellular functions still remain elusive. In this study, a genetic screening of an E. coli genomic library was performed to identify those genes which can restore the growth ability of a cold-sensitive mutant, Era(Cs) (E200K), at a restrictive temperature when expressed in a multicopy plasmid. Among eight suppressors isolated, six were located at 1 min of the E. coli genomic map, and the gene responsible for the suppression of Era(Cs) (E200K) was identified as the ksgA gene for 16S rRNA transmethylase, whose mutation causes a phenotype of resistance to kasugamycin, a translation initiation inhibitor. This is the first demonstration of suppression of impaired function of Era by overproduction of a functional enzyme. A possible mechanism of the suppression of the Era cold-sensitive phenotype by KsgA overproduction is discussed. |
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| Keywords |
Chromosome Mapping; Cloning, Molecular; Cold Temperature; Escherichia coli/enzymology; Escherichia coli/genetics; Escherichia coli/growth & development; Escherichia coli Proteins; GTP Phosphohydrolases/genetics; GTP-Binding Proteins/genetics; Genes, Bacterial/genetics; Genes, Suppressor/genetics; Methyltransferases/genetics; Mutation; RNA-Binding Proteins |
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