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. 1978 Nov;136(2):538–547. doi: 10.1128/jb.136.2.538-547.1978

Repair of cross-linked DNA and survival of Escherichia coli treated with psoralen and light: effects of mutations influencing genetic recombination and DNA metabolism.

R R Sinden, R S Cole
PMCID: PMC218577  PMID: 361714

Abstract

Repair of cross-linked DNA was studied in Escherichia coli strains carrying mutations affecting DNA metabolism. In wild-type cells, DNA strands cut during cross-link removal were rejoined during a subsequent incubation into high-molecular-weight molecules. This rejoining was dependent on gene products involved in genetic recombination. A close correlation was found relating recombination proficiency, the rate of strand rejoining, and formation of viable progeny after DNA cross-linking by treatment with psoralen and light. Wild-type cells and other mutants which were Rec+ (sbcB, recL, recL sbcB, recB recC sbcA, recB recC sbcB, xthA1, and xthA11) rejoined cut DNA strands at a rate of 0.8 +/- 0.1 min -1 at 37 degrees C and survived 53 to 71 cross-links per chromosome. recB, recC, recB recC, recF, or polA strains showed reduced rates of strand rejoining and survived 4 to 13 cross-links per chromosome. Recombination-deficient strains (recA, recB recC sbcB recF, recB recL) and lexA failed to rejoin DNA strands after crosslink removal and were unable to form colonies after treatments producing as few as one to two cross-links per chromosome. Strand rejoining occurred normally in cells with mutations affecting DNA replication (dnaA, danB, dnaG, and dnaE) under both permissive and nonpermissive conditions for chromosome replication. In a polA polB dnaE strain strand rejoining occurred at 32 degree C but not at 42 degree C, indicating that some DNA synthesis was required for formation of intact recombinant molecules.

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Selected References

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