Download MendeleyStructural Basis for Excision of 5-Formylcytosine by Thymine DNA Glycosylase.
Pidugu, L.S., Flowers, J.W., Coey, C.T., Pozharski, E., Greenberg, M.M., Drohat, A.C.(2016) Biochemistry 55: 6205-6208
- PubMed: 27805810
- DOI: https://doi.org/10.1021/acs.biochem.6b00982
- Primary Citation of Related Structures:
5T2W - PubMed Abstract:
Thymine DNA glycosylase (TDG) is a base excision repair enzyme with key functions in epigenetic regulation. Performing a critical step in a pathway for active DNA demethylation, TDG removes 5-formylcytosine and 5-carboxylcytosine, oxidized derivatives of 5-methylcytosine that are generated by TET (ten-eleven translocation) enzymes. We determined a crystal structure of TDG bound to DNA with a noncleavable (2'-fluoroarabino) analogue of 5-formyldeoxycytidine flipped into its active site, revealing how it recognizes and hydrolytically excises fC. Together with previous structural and biochemical findings, the results illustrate how TDG employs an adaptable active site to excise a broad variety of nucleobases from DNA.
Organizational Affiliation:
Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine , Baltimore, Maryland 21201, United States.
