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• W4293737585 endingPage "103391" @default.
• W4293737585 startingPage "103391" @default.
• W4293737585 abstract "The apurinic/apyrimidinic (abasic, AP) site is one of the most abundant DNA lesions. Previous studies by others demonstrated that human AlkB homologue 1 (ALKBH1) catalyzes the DNA strand incision at an AP site, resulting in suicidal cross-linking of the enzyme to the 3'-DNA end. Prior site-directed mutagenesis experiments had reported that Cys129 of ALKBH1 is the predominant nucleophile that conjugates to the C3' position of the incised AP site, 3'-phospho-α,β-unsaturated aldehyde (3'-PUA), to form a 3'-PUA-ALKBH1 cross-link. However, direct evidence to support this mechanism was lacking. The 3'-PUA-ALKBH1 cross-link is so far the only adduct that has been found to form via a Michael addition reaction between a protein and 3'-PUA. It is unclear whether and how this type of cross-link is repaired. In this study, we first demonstrated that the 3'-PUA-ALKBH1 cross-link is fairly stable under physiological temperature and pH as only ~10% of the adduct decomposed after a 3-day incubation. Using a gel-based assay with an aldehyde-reacting probe, we demonstrated that the 3'-PUA-ALKBH1 cross-link has a free aldehyde group that is in line with the Michael addition mechanism. Moreover, we found that the 3'-PUA-ALKBH1 cross-link can be excised by human tyrosyl-DNA phosphodiesterase 1 (TDP1) and the removal efficiency is significantly enhanced if the adduct is pre-digested by trypsin. Notably, we employed TDP1 as a molecular tool to homogeneously release the cross-linked peptides from DNA to facilitate liquid chromatography tandem mass spectrometry analysis, and demonstrated that Cys129 and Cys371 of ALKBH1 cross-link to 3'-PUA." @default.
• W4293737585 created "2022-08-31" @default.
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• W4293737585 date "2022-11-01" @default.
• W4293737585 modified "2023-09-29" @default.
• W4293737585 title "Tyrosyl-DNA phosphodiesterase 1 excises the 3′-DNA-ALKBH1 cross-link and its application for 3′-DNA-ALKBH1 cross-link characterization by LC-MS/MS" @default.
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• W4293737585 doi "https://doi.org/10.1016/j.dnarep.2022.103391" @default.
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