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. 1988 Jan;170(1):372–379. doi: 10.1128/jb.170.1.372-379.1988

Comparative nucleotide sequence analysis of growth-rate-regulated gnd alleles from natural isolates of Escherichia coli and from Salmonella typhimurium LT-2.

G J Barcak 1, R E Wolf Jr 1
PMCID: PMC210652  PMID: 3275621

Abstract

A comparative study of gnd genes from Escherichia coli strains isolated from natural populations and laboratory strains and from Salmonella typhimurium was undertaken. In the accompanying paper (G. J. Barcak and R. E. Wolf, Jr., J. Bacteriol. 170:365-371, 1988), we showed that the growth-rate-dependent regulation of gnd expression was conserved among four natural E. coli isolates and E. coli B/r in a manner qualitatively similar to that of the gene from E. coli K-12. Here, we report the DNA sequence of the 5' regulatory region and the first 125 codons of the structural gene for the five E. coli gnd genes and the gnd gene from S. typhimurium LT-2. The sequences differed from one another by 5% on the average. All sequences defined putative secondary structures of the mRNA leader, which were previously proposed to be important in the regulation of the K-12 gene. In addition, a sequence between codons 69 and 74, which is highly complementary to the ribosome-binding site of the mRNA, was conserved in all the genes. The sequence data are discussed with respect to potential regulatory consequences.

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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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