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Mutations at the gyrB locus were found to decrease the degree of supercoiling of the Escherichia coli chromosome. The effect of a gyrB mutation on the repair of ultraviolet-induced deoxyribonucleic acid damage was studied by following the killing of strains of E. coli K-12 proficient and deficient in deoxyribonucleic acid repair. The effectiveness of both excision and postreplication types of deoxyribonucleic acid repair was found to be altered by this mutation, the former being apparently enhanced and the latter impaired.

journal of bacteriology

Effect of gyrB-mediated changes in chromosome structure on killing of Escherichia coli by ultraviolet light: experiments with strains differing in deoxyribonucleic acid repair capacity