Journal
GENES & DEVELOPMENT
Volume 17, Issue 22, Pages 2777-2785Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.1146103
Keywords
Y-family DNA polymerases; base excision repair; abasic site; 5 '-doexyribose phosphate; 5 '-dRP; lyase
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Funding
- NIEHS NIH HHS [ES012411, R01 ES012411] Funding Source: Medline
- NIGMS NIH HHS [GM19261] Funding Source: Medline
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The human Y-family DNA polymerases, POlL, Poleta, and Polkappa, function in promoting replication through DNA lesions. However, because of their low fidelity, any involvement of these polymerases in DNA synthesis during base excision repair (BER) would be highly mutagenic. Mechanisms, therefore, must exist to exclude their participation in BER. Here, we show that although PolL, Poleta, and Polkappa are all able to form a covalent Schiff base intermediate with the 5'-deoxyribose phosphate (5'-dRP) residue that results from the incision of DNA at an abasic site by an AP endonuclease, they all lack the ability for the subsequent catalytic removal of the 5'-dRP group. Instead, the covalent trapping of these polymerases by the 5'-dRP residue inhibits their DNA synthetic activity during BER. The unprecedented ability of these polymerases for robust Schiff base formation without the release of the 5'-dRP product provides a means of preventing their participation in the DNA synthetic step of BER, thereby avoiding the high incidence of mutagenesis and carcinogenesis that would otherwise occur.
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