CATH Classification

Domain Context

CATH Clusters

Superfamily Methylated DNA-protein cysteine methyltransferase domain
Functional Family Methylated-DNA--protein-cysteine methyltransferase

Enzyme Information

2.1.1.63
Methylated-DNA--[protein]-cysteine S-methyltransferase.
based on mapping to UniProt P16455
(1) DNA (containing 6-O-methylguanine) + protein L-cysteine = DNA (without 6-O-methylguanine) + protein S-methyl-L-cysteine. (2) DNA (containing 4-O-methylthymine) + protein L-cysteine = DNA (without 4-O-methylthymine) + protein S-methyl-L-cysteine.
-!- This protein is involved in the repair of methylated DNA. -!- Unlike EC 3.2.2.20 and EC 3.2.2.21, which remove the methylated base leaving an apurinic/apyrimidinic site, this enzyme transfers the methyl group from the methylated DNA to an internal cysteine residue, leaving an intact nucleotide. -!- Since the methyl transfer is irreversible, the enzyme can only catalyze a single turnover.

UniProtKB Entries (1)

P16455
MGMT_HUMAN
Homo sapiens
Methylated-DNA--protein-cysteine methyltransferase

PDB Structure

PDB 1T38
External Links
Method X-RAY DIFFRACTION
Organism Escherichia
Primary Citation
DNA binding and nucleotide flipping by the human DNA repair protein AGT.
Daniels, D.S., Woo, T.T., Luu, K.X., Noll, D.M., Clarke, N.D., Pegg, A.E., Tainer, J.A.
Nat.Struct.Mol.Biol.