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Era, a Ras-like GTP-binding protein inEscherichia coli , has been shown to be essential for growth. However, its cellular functions still remain elusive. In this study, a genetic screening of anE. 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 theE. coli genomic map, and the gene responsible for the suppression of Era(Cs) (E200K) was identified as theksgA 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.

journal of bacteriology

The Gene for 16S rRNA Methyltransferase ( <i>ksgA</i> ) Functions as a Multicopy Suppressor for a Cold-Sensitive Mutant of Era, an Essential RAS-Like GTP-Binding Protein in <i>Escherichia coli</i>

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