IUBMB Enzyme Nomenclature


Accepted name: thymine-DNA glycosylase

Reaction: Hydrolyzes mismatched double-stranded DNA and polynucleotides, releasing free thymine

Other name(s): mismatch-specific thymine-DNA glycosylase; mismatch-specific thymine-DNA N-glycosylase; hTDG; hsTDG; TDG; thymine DNA glycosylase; G/T glycosylase; uracil/thymine DNA glycosylase; T:G mismatch-specific thymidine-DNA glycosylase; G:T mismatch-specific thymine DNA-glycosylase

Systematic name: thymine-DNA deoxyribohydrolase (thymine-releasing)

Comments: Thymine-DNA glycosylase is part of the DNA-repair machinery. Thymine removal is fastest when it is from a G/T mismatch with a 5'-flanking C/G pair. The glycosylase removes uracil from G/U, C/U, and T/U base pairs faster than it removes thymine from G/T [3].

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. Waters, T.R. and Swann, P.F. Thymine-DNA glycosylase and G to A transition mutations at CpG sites. Mutat Res 462 (2000) 137-147. [PMID: 10767625]

2. Neddermann, P. and Jiricny, J. The purification of a mismatch-specific thymine-DNA glycosylase from HeLa cells. J. Biol. Chem. 268 (1993) 21218-21224. [PMID: 8407958]

3. Waters, T.R. and Swann, P.F. Kinetics of the action of thymine DNA glycosylase. J. Biol. Chem. 273 (1998) 20007-20014. [PMID: 9685338]

[EC created 2009]

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