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The role of the excision-repair enzymes in mutation-induction by cis-Pt(NH3)2Cl2.

Mutation induction by cis-Pt(NH3)2Cl2 (cisplatin) has been shown to be absent in E.coli strains carrying a deletion of the uvrB gene (1). This suggested that excision-repair, which is normally thought to be error-free, is involved in mutation induction with cisplatin. Here, the role of the excision repair enzymes UvrA, UvrB and UvrC is investigated using E.coli strains with different repair capacities. It is shown that cisplatin induced mutagenesis is dependent both on UvrA and UvrB but not on UvrC. Of the UvrB enzyme the N-terminal 113 aminoacids are sufficient for mutation induction by cisplatin.