Abstract
The formation of covalently bound DNA-protein crosslinks (DPCs) is linked to the pathophysiology of cancers and many other degenerative diseases. Knowledge of the proteins that were frequently involved in forming DPCs will improve our understanding of the etiological mechanism of diseases and facilitate the establishment of preventive measures and treatment methods. By using SDS-PAGE and nano-LC coupled Orbitrap LC-MS/MS analyses, we identified, for the first time, that the major DNA-cross-linked proteins in HeLa cells exposed to a methylating agent (methylmethanesulfonate) or hydroxyl free radicals are transcription-associated proteins. In particular, histone H2B3B and poly(rC) binding protein 2 were identified as the most frequent DPC-forming proteins.
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