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• W1963883775 abstract "ALKBH1 (AlkB homologue 1) is a mammalian AlkB (2-oxoglutarate-dependent dioxygenase) homologue that possesses AP (abasic or apurinic/apyrimidinic) lyase activity. The AP lyase reaction is catalysed by imine formation with an active site lysine residue, and a covalent intermediate can be trapped in the presence of NaBH4. Surprisingly, ALKBH1 also forms a stable protein–DNA adduct in the absence of a reducing agent. Experiments with different substrates demonstrated that the protein covalently binds to the 5′ DNA product, i.e. the fragment containing an α,β-unsaturated aldehyde. The N-terminal domain of ALKBH1 was identified as the main site of linkage with DNA. By contrast, mutagenesis studies suggest that the primary catalytic residue forming the imine linkage is Lys133, with Lys154 and other lysine residues in this region serving in opportunistic roles. These findings confirm the classification of ALKBH1 as an AP lyase, identify the primary and a secondary lysine residues involved in the lyase reaction, and demonstrate that the protein forms a covalent adduct with the 5′ DNA product. We propose two plausible chemical mechanisms to account for the covalent attachment." @default.
• W1963883775 created "2016-06-24" @default.
• W1963883775 creator A5065700590 @default.
• W1963883775 creator A5067007014 @default.
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• W1963883775 date "2013-05-31" @default.
• W1963883775 modified "2023-09-30" @default.
• W1963883775 title "A covalent protein–DNA 5′-product adduct is generated following AP lyase activity of human ALKBH1 (AlkB homologue 1)" @default.
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• W1963883775 doi "https://doi.org/10.1042/bj20121908" @default.
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• W1963883775 hasPublicationYear "2013" @default.
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