Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 38, Pages 10044-10048Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201403334
Keywords
DNA repair; molecular modeling; oxidative damage; quantum chemistry; ribose
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Funding
- DFG [SFB749]
- Excellence Cluster EXC114 (CIPSM)
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Living organisms protect the genome against external influences by recognizing and repairing damaged DNA. A common source of gene mutation is the oxidized guanine, which undergoes base excision repair through cleavage of the glycosidic bond between the ribose and the nucleobase of the lesion. We unravel the repair mechanism utilized by bacterial glycosylase, MutM, using quantum-chemical calculations involving more than 1000 atoms of the catalytic site. In contrast to the base-protonated pathway currently favored in the literature, we show that the initial protonation of the lesion's ribose paves the way for an almost barrier-free glycosidic cleavage. The combination of theoretical and experimental data provides further insight into the selectivity and discrimination of MutM's binding site toward various substrates.
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