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DNA ligase I fidelity mediates the mutagenic ligation of pol β oxidized nucleotide insertion products and base excision repair intermediates with mismatches

Pradnya Kamble, Kalen Hall, Mahesh Chandak, Qun Tang, Melike Çağlayan
doi: https://doi.org/10.1101/2020.10.30.362251
Pradnya Kamble
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
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Kalen Hall
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
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Mahesh Chandak
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
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Qun Tang
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
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Melike Çağlayan
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
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  • For correspondence: caglayanm@ufl.edu
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ABSTRACT

DNA ligase I (LIG1) completes base excision repair (BER) pathway at the last nick sealing step following DNA polymerase (pol) β gap filling DNA synthesis. We previously reported that pol β 8-oxo-2’-deoxyribonucleoside 5’-triphosphate (8-oxodGTP) insertion confounds LIG1 leading to the formation of ligation failure products with 5’-adenylate (AMP) block. Here, we report the mutagenic ligation of pol β 8-oxodGTP insertion products and an inefficient substrate-product channeling from pol β Watson-Crick like dG:T mismatch insertion to DNA ligation by LIG1 mutant with perturbed fidelity (E346A/E592A) in vitro. Moreover, our results revealed that the substrate discrimination of LIG1 for the nicked repair intermediates with preinserted 3’-8-oxodG or mismatches is governed by the mutations at both E346 and E592 residues. Finally, we found that Aprataxin (APTX) and Flap Endonuclease 1 (FEN1), as compensatory DNA-end processing enzymes, can remove 5’-AMP block from the abortive ligation products with 3’-8-oxodG or all possible 12 non-canonical base pairs. These findings contribute to understand the role of LIG1 as an important determinant of faithful BER, and how a multi-protein complex (LIG1, pol β, APTX and FEN1) can coordinate to hinder the formation of mutagenic repair intermediates with damaged or mismatched ends at the downstream steps of the BER pathway.

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Posted October 31, 2020.
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DNA ligase I fidelity mediates the mutagenic ligation of pol β oxidized nucleotide insertion products and base excision repair intermediates with mismatches
Pradnya Kamble, Kalen Hall, Mahesh Chandak, Qun Tang, Melike Çağlayan
bioRxiv 2020.10.30.362251; doi: https://doi.org/10.1101/2020.10.30.362251
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DNA ligase I fidelity mediates the mutagenic ligation of pol β oxidized nucleotide insertion products and base excision repair intermediates with mismatches
Pradnya Kamble, Kalen Hall, Mahesh Chandak, Qun Tang, Melike Çağlayan
bioRxiv 2020.10.30.362251; doi: https://doi.org/10.1101/2020.10.30.362251

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