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J. Bacteriol., Jan 1998, 73-82, Vol 180, No. 1
GO Bylund, LC Wipemo, LA Lundberg and PM Wikstrom
The trmD operon is located at 56.7 min on the genetic map of the
Escherichia coli chromosome and contains the genes for ribosomal protein
(r-protein) S16, a 21-kDa protein (RimM, formerly called 21K), the tRNA
(m1G37)methyltransferase (TrmD), and r-protein L19, in that order.
Previously, we have shown that strains from which the rimM gene has been
deleted have a sevenfold-reduced growth rate and a reduced translational
efficiency. The slow growth and translational deficiency were found to be
partly suppressed by mutations in rpsM, which encodes r-protein S13.
Further, the RimM protein was shown to have affinity for free ribosomal 30S
subunits but not for 30S subunits in the 70S ribosomes. Here we have
isolated several new suppressor mutations, most of which seem to be located
close to or within the nusA operon at 68.9 min on the chromosome. For at
least one of these mutations, increased expression of the ribosome binding
factor RbfA is responsible for the suppression of the slow growth and
translational deficiency of a deltarimM mutant. Further, the RimM and RbfA
proteins were found to be essential for efficient processing of 16S rRNA.
Copyright © 1998, American Society for Microbiology
RimM and RbfA are essential for efficient processing of 16S rRNA in Escherichia coli [In Process Citation]
Department of Microbiology, Umea University, Sweden.
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