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. 1988 Jul;170(7):3150–3157. doi: 10.1128/jb.170.7.3150-3157.1988

DNA sequences of the cysK regions of Salmonella typhimurium and Escherichia coli and linkage of the cysK regions to ptsH.

C R Byrne 1, R S Monroe 1, K A Ward 1, N M Kredich 1
PMCID: PMC211262  PMID: 3290198

Abstract

Nucleotide sequences of the cysK regions of Salmonella typhimurium and Escherichia coli have been determined. A total of 3,812 and 2,595 nucleotides were sequenced from S. typhimurium and E. coli, respectively. Open reading frames of 323 codons were found in both species and were identified as those of cysK by comparison of deduced amino acid sequences with amino- and carboxyl-terminal amino acid analyses of the S. typhimurium cysK gene product O-acetylserine (thiol)-lyase A. The two cysK DNA sequences were 85% identical, and the deduced amino acid sequences were 96% identical. The major transcription initiation sites for cysK were found to be virtually identical in the two organisms, by using primer extension and S1 nuclease protection techniques. The -35 region corresponding to the major transcription start site was TTCCCC in S. typhimurium and TTCCGC in E. coli. The deviation of these sequences from the consensus sequence TTGACA may reflect the fact that cysK is subject to positive control and requires the cysB regulatory protein for expression. Sequences downstream of cysK were found to include ptsH and a portion of ptsI, thus establishing the exact relationship of cysK with these two genes. A 290-codon open reading frame, which may represent the cysZ gene, was identified upstream of cysK.

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Selected References

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