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. 1981 Jan;145(1):434–441. doi: 10.1128/jb.145.1.434-441.1981

Postreplication repair of ultraviolet-irradiated transforming deoxyribonucleic acid in Bacillus subtilis.

C T Hadden
PMCID: PMC217291  PMID: 6780518

Abstract

Repair of ultraviolet-irradiated transforming deoxyriboinucleic acid (DNA) in several strains of Bacillus subtilis was studied in order to determine the effects of excision repair and postreplication repair on transformation. Two mutations that cause a Uvr- and phenotype (uvr-1 and uvr-42) were shown to have strikingly different effects on repair of ultraviolet-irradiated transforming DNA. Genetic and kinetic evidence is presented to show that integrated DNA was apparently repaired by both excision and postreplication repair in wild-type and in uvr-1 recipients, although the latter excise pyrimidine dimers very slowly. In uvr-42 mutants, which are defective in incision at pyrimidine dimers, dimer-containing DNA was integrated. Postreplication repair apparently saved uvr-42 recipient cells from the lethal effects of integrated dimers, but the recombination events accompanying postreplication repair greatly reduced the linkage between closely linked genetic markers in the donor DNA. Repair of transforming DNA in a recG recipient, which does excision repair but not postreplication repair, was nearly as efficient as in wild-type cells. However, in this recipient linkage was altered only slightly, if at all, compared with wild-type cells. The apparent reduction in size of integrated regions of ultraviolet-irradiation transforming DNA probably results mainly from postreplication repair of larger integrated regions.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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