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. 1992 Aug;174(15):5165–5167. doi: 10.1128/jb.174.15.5165-5167.1992

Construction and characterization of Streptomyces coelicolor A3(2) mutants that are multiply deficient in the nonessential hrd-encoded RNA polymerase sigma factors.

M J Buttner 1, C G Lewis 1
PMCID: PMC206340  PMID: 1629177

Abstract

Previous studies showed that Streptomyces coelicolor A3(2) has four genes (hrdA, hrdB, hrdC, and hrdD) that appear to encode RNA polymerase sigma factors very similar to the sigma 70 subunit of Escherichia coli and that hrdC and hrdD could be individually disrupted without causing obvious phenotypic defects. Here, hrdA was cloned and stable null hrdA and hrdD mutants were constructed by gene replacement. These two mutants and a previously constructed hrdC null mutant were used in crosses to generate hrdAC, hrdAD, hrdCD, and hrdACD strains. The inability to synthesize one, two, or all three of the nonessential hrd-encoded sigma factors had no obvious phenotypic consequences.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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