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• W2913351570 abstract "Oxaliplatin, together with cisplatin, is among the most important drugs used in cancer chemotherapy. Oxaliplatin, which contains a bulky diaminocyclohexane (DACH) moiety, kills cancer cells mainly by producing (DACH)Pt-GpG intrastrand cross-links that impede transcription. The Pt-GpG tolerance by translesion DNA synthesis (TLS) polymerases contributes to the resistance of tumors to platinum-based chemotherapy. In particular, human DNA polymerase η (Polη) readily bypasses Pt-GpG adducts. While many structural studies have addressed how TLS polymerases interact with cisplatin-DNA adducts, a structure of DNA polymerase in complex with oxaliplatin-DNA adducts has not been reported, limiting our understanding of bypass of the bulky (DACH)Pt-GpG lesion by TLS polymerases. Herein, we report the first structure of DNA polymerase bound to oxaliplatinated DNA. We determined a crystal structure of Polη incorporating dCTP opposite the 3'G of the (DACH)Pt-GpG, which provides insights into accurate, efficient bypass of the oxaliplatin-GpG adducts by TLS polymerases. In the catalytic site of Polη, the 3'G of the (DACH)Pt-GpG formed three Watson-Crick hydrogen bonds with incoming dCTP and the primer terminus 3'-OH was optimally positioned for nucleotidyl transfer. To accommodate the bulky (DACH)Pt-GpG lesion, the Val59-Trp64 loop in the finger domain of Polη shifted from the positions observed in the corresponding Polη-cisplatin-GpG and undamaged structures, suggesting that the flexibility of the Val59-Trp64 loop allows the enzyme's bypass of the (DACH)Pt-GpG adducts. Overall, the Polη-oxaliplatin-GpG structure provides a structural basis for TLS-mediated bypass of the major oxaliplatin-DNA adducts and insights into resistance to platinum-based chemotherapy in humans." @default.
• W2913351570 created "2019-02-21" @default.
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• W2913351570 date "2019-02-28" @default.
• W2913351570 modified "2023-10-12" @default.
• W2913351570 title "Structural basis for the bypass of the major oxaliplatin–DNA adducts by human DNA polymerase η" @default.
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• W2913351570 doi "https://doi.org/10.1042/bcj20180848" @default.
• W2913351570 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6657808" @default.
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