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. 1980 Nov;144(2):489–498. doi: 10.1128/jb.144.2.489-498.1980

Synthesis of recA protein and induction of bacteriophage lambda in single-strand deoxyribonucleic acid-binding protein mutants of Escherichia coli.

J Baluch, J W Chase, R Sussman
PMCID: PMC294695  PMID: 6448838

Abstract

We investigated the capacity of Escherichia coli mutants defective in the single-strand deoxyribonucleic acid (DNA)-binding protein to amplify the synthesis of the recA protein, induce prophage lambda, and degrade their DNA after treatment with ultraviolet radiation, mitomycin C, or bleomycin. The thermosensitive ssbA1 strain induced recA protein and lambda phage normally at 30 degrees C, but no induction was observed at 42 degrees C when ultraviolet radiation or mitomycin C was used. The lexC113 mutant did not amplify recA protein synthesis or induce phage lambda at either 30 or 42 degrees C with those agents. Bleomycin was able to elicit induction of recA and phage lambda in both mutants at any temperature. After induction with ultraviolet radiation at the elevated temperature, no DNA degradation was observed for 40 min, but at later times there was increased degradation in the lexC113 strain, compared with the wild type, and even greater degradation in the ssbA1 mutant. We discuss the role of single-strand DNA-binding protein in induction and the possibility that the lexC product may exert its influence on recA and lambda induction at the level of the single-strand DNA gap.

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Selected References

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