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. 1991 May;173(9):2906–2914. doi: 10.1128/jb.173.9.2906-2914.1991

Heterospecific expression of misrepair-enhancing activity of mucAB in Escherichia coli and Bacillus subtilis.

H Tanooka 1, K Tanaka 1, K Shinozaki 1
PMCID: PMC207872  PMID: 1902211

Abstract

Enterobacterial plasmid genes mucAB, which possess error-prone repair activity, were cloned and sequenced independently of a sequence previously determined (K.L. Perry, S.J. Elledge, B.B. Mitchell, L. Marsh, and G.C. Walker, Proc. Natl. Acad. Sci. USA 82:4331-4335, 1985). The survival- and mutation-enhancing activities of mucAB ligated to the MLSr promoter of a Bacillus subtilis plasmid in the shuttle vector pTE22R were expressed in B. subtilis as well as in Escherichia coli after mutagenic treatment. mucAB fragments with 5' deletions of various lengths up to the base sequence encoding Ala-26-Gly-27, the putative RecA-mediated cleavage site of the MucA protein, showed mutation-enhancing activity for noninducible lexA3 E. coli when ligated to the MLSr promoter in frame. This activity was lost by extending the deletion downstream. The formations of MucA and MucB proteins in B. subtilis and E. coli were demonstrated by Western blot (immunoblot) analysis. MucA cleavage in Rec+ B. subtilis was observed only after treatment with an alkylating agent and was not observed in RecA- and RecE- strains, whereas in E. coli cleavage was observed in Rec+ cells after treatment with either mitomycin C or an alkylating agent but was not detected in RecA- cells. Common activity of B. subtilis Rec and E. coli RecA in the induction of mutants is suggested.

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Selected References

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