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. 1996 Jan;178(2):424–434. doi: 10.1128/jb.178.2.424-434.1996

Dra-nupC-pdp operon of Bacillus subtilis: nucleotide sequence, induction by deoxyribonucleosides, and transcriptional regulation by the deoR-encoded DeoR repressor protein.

H H Saxild 1, L N Andersen 1, K Hammer 1
PMCID: PMC177674  PMID: 8550462

Abstract

The genes encoding deoxyriboaldolase (dra), nucleoside uptake protein (nupC), and pyrimidine nucleoside sequences were determined. Sequence analysis showed that the genes were localized immediately downstream of the hut operon. Insertional gene disruption studies indicated that the three genes constitute an operon with the gene order dra-nupC-pdp. A promoter mapping immediately upstream of the dra gene was identified, and downstream of the pdp gene the nucleotide sequence indicated the existence of a factor-independent transcription terminator structure. In wild-type cells growing in succinate minimal medium, the pyrimidine nucleoside phosphorylase and deoxyriboaldolase levels were five- to eightfold higher in the presence of thymidine and fourfold higher in the presence of deoxyadenosine. By the use of lacZ fusions, the regulation was found to be at the level of transcription. The operon expression was subject to glucose repression. Upstream of the dra gene an open reading frame of 313 amino acids was identified. Inactivation of this gene led to an approximately 10-fold increase in the levels of deoxyriboaldolase and pyrimidine nucleoside phosphorylase, and no further induction was seen upon the addition of deoxyribonucleosides. The upstream gene most likely encodes the regulator for the dra-nupC-pdp operon and was designated deoR (stands for deoxyribonucleoside regulator).

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Selected References

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