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J Bacteriol. 1977 December; 132(3): 856-861

Repair and subsequent fragmentation of deoxyribonucleic acid in ultraviolet-irradiated Bacillus subtilis recA.

C T Hadden

ABSTRACT

Cells of Bacillus subtilis recA1 are sensitive to irradiation with ultraviolet light. Evidence is presented here that these cells are not defective in ultraviolet light-induced incision of deoxyribonucleic acid (DNA) or repair DNA synthesis. Ligation of DNA at repair sites appears to occur, but the DNA is subsequently fragmented, apparently at sites of previous repair synthesis. It is hypothesized that the defect in DNA repair leads to host-specific restriction at repaired sites because of a defect in either the structure of the repaired region or specificity of the restriction/modification system.

J Bacteriol. 1977 December; 132(3): 856-861






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