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Excision of pyrimidine dimers in toluene-treated Escherichia coli

Toluene-treated cells were used for examining excision of pyrimidine dimers in Escherichia coli strains W3110, DM845 (uvrA-), P3478 (polA-), and KS5064 (polAex1). Excision occurring in toluene-treated cells is rapid, adenosine 5'-triphosphate dependent, and requires the uvrA gene function. In strains lacking either the polymerizing or 5' leads to 3' exonucleolytic activity of deoxyribonucleic acid polymerase I, excision does occur. However, both in vivo and in vitro, the excision in such strains is initially slower than wild type.