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. 1988 Sep;170(9):4209–4215. doi: 10.1128/jb.170.9.4209-4215.1988

Structures of the promoter and operator of the glpD gene encoding aerobic sn-glycerol-3-phosphate dehydrogenase of Escherichia coli K-12.

S Z Ye 1, T J Larson 1
PMCID: PMC211429  PMID: 3045087

Abstract

The nucleotide sequence of a 690-base-pair DNA segment containing the control region for the glpD gene encoding aerobic sn-glycerol-3-phosphate dehydrogenase was determined. An ATG translation initiation codon with an adjacent ribosome-binding site was found which preceded an open reading frame continuing 61 codons to the end of the DNA that was sequenced. The start site for transcription, identified by using primer extension analysis, was located 42 base pairs upstream from the proposed Met start codon. The transcription start site was preceded by a region containing typical -10 and -35 sequences found in bacterial promoters. A binding site for the cyclic AMP-cyclic AMP receptor protein complex (identified by comparison with the consensus-binding sequence and verified by using DNase I footprinting) was located just upstream from the -35 sequence, centered at position -63. The interaction site for the glp repressor was identified by using DNase I footprinting. It consisted of a 49-base-pair region which started at the -10 sequence and continued to position +38. This region contained two directly repeated sequences, each possessing hyphenated dyad symmetry, which suggests that the operator is tandemly repeated. The presence of two adjacent operators may explain why expression of the glpD gene is the most sensitive to repressor when compared with expression of the other operons that are members of the glp regulon.

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Selected References

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