Expression of the ATP-dependent deoxyribonuclease of Bacillus subtilis is under competence-mediated control - PubMed (original) (raw)
Expression of the ATP-dependent deoxyribonuclease of Bacillus subtilis is under competence-mediated control
B J Haijema et al. Mol Microbiol. 1995 Jan.
Abstract
Transcription of the ATP-dependent deoxynuclease operon (addAB), as monitored by means of an addAB-lacZ transcriptional fusion, has a low, constitutive level and is initiated from a sigma A type promoter. Transcription of addAB is independent of DNA-damaging agents known to induce the SOS response in Bacillus subtilis. However, addAB transcription increased significantly during competence development. This competence-specific induction was dependent on the gene products of srfA, degU and comK, but not on that of recA. Deletion analysis of the addAB promoter region demonstrated that the competence-specific transcription induction requires DNA sequences located upstream of the addAB promoter that associated with ComK, the competence transcription factor. The latter finding indicates that a direct regulatory link exists between the establishment of the competent state and the synthesis of AddAB, required for recombination of internalized donor DNA.
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