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. 1979 Jan;137(1):584–594. doi: 10.1128/jb.137.1.584-594.1979

Organization of genes for transcription and translation in the rif region of the Escherichia coli chromosome.

M Yamamoto, M Nomura
PMCID: PMC218486  PMID: 368032

Abstract

The lambdarifd18 transducing phage is known to carry several genes for components of transcriptional and translational machineries; these genes are clustered in the rif region at 88 min on the Escherichia coli genetic map. They include a set of genes for rRNA's (rrnB), a gene for spacer tRNA, tRNA2Glu (tgtB), one of the two genes for EF-Tu (tufB), genes for four ribosomal proteins (rplK, A, J, and L), genes for the beta and beta' subunits of RNA polymerase (rpoB and rpoC), and genes for three tRNA's (tyrU, gluT, and thrT). An additional tRNA gene (subsequently identified as thrU by Landy and his co-workers) and a gene for a protein (protein U) with unknown functions were found to be carried by lambdarif d18. We analyzed the organization of these genes by using various deletion and hybrid phages derived from lambdarif d18 and lambdarif d12, a phage related to lambdarif d18. The expression of various genes was examined in UV-irradiated cells infected with these transducing phages. Two main conclusions were obtained. First, the four tRNA genes are not cotranscribed with the genes in rrnB, even though these tRNA genes are located close to the distal end of rrnB. Second, the four ribosomal protein genes are organized into two separate transcriptional units; rplK and A are in one unit and rplJ and L are in the second unit. The first group of genes was shown to have a promoter separate from that for tufB or protein U. The second group of genes shares the promoter with rpoB and C, as described in a separate paper (M. Yamamoto and M. Nomura, Proc. Natl. Acad. Sci. U.S.A., 75:3891--3895). These and other results described in this paper show that the genes are organized in the following order: promoter, genes in rrnB; promoter, thrU, tyrU, (promoter?) glyT, thrT; (promoter?) tufB; promoter, a gene for protein U; promoter, rplK, rplA; promoter, rplJ, rplL, rpoB, rpoC.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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