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Mol Microbiol. 1994 Apr;12(1):31-9.

Mutations that affect regulation of the korB gene of Streptomyces lividans plasmid plJ101 alter plasmid transmission.

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Department of Genetics, Stanford University School of Medicine, California 94305.


Using the catechol dehydrogenase gene as a reporter, we isolated random mutations in the plJ101 korB gene operator/promoter (OP) region that affect korB expression and regulation. We mapped these mutations to inverted repeat sequences within the promoter and studied their effects on binding of the KorB repressor protein to the OP, on expression of the korB gene, and on plasmid transmission during mating. Additionally, we investigated the biological effects of KorB binding to a locus (sti, for strong incompatibility) adjacent to the korB OP and implicated in plJ101 replication. Our results identify sites that influence the synthesis and autoregulation of KorB; they also show that interaction of KorB with sti affects repression of korB and transmission of plasmids to spores of recipients.

[Indexed for MEDLINE]

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