FUNCTION: Catalyzes the S-methylation of thiopurine drugs such as 6-mercaptopurine (also called mercaptopurine, 6-MP or its brand name Purinethol) and 6-thioguanine (also called tioguanine or 6-TG) using S-adenosyl-L-methionine as the methyl donor (PubMed:657528, PubMed:18484748). TPMT activity modu...
FUNCTION: Catalyzes the S-methylation of thiopurine drugs such as 6-mercaptopurine (also called mercaptopurine, 6-MP or its brand name Purinethol) and 6-thioguanine (also called tioguanine or 6-TG) using S-adenosyl-L-methionine as the methyl donor (PubMed:657528, PubMed:18484748). TPMT activity modulates the cytotoxic effects of thiopurine prodrugs. A natural substrate for this enzyme has yet to be identified. {ECO:0000269|PubMed:18484748, ECO:0000269|PubMed:657528, ECO:0000305}.
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GO - Biological processes (BP):
methylation [GO:0032259]; nucleobase-containing compound metabolic process [GO:0006139]; xenobiotic metabolic process [GO:0006805]...
methylation [GO:0032259]; nucleobase-containing compound metabolic process [GO:0006139]; xenobiotic metabolic process [GO:0006805]
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GO - Molecular function (MF):
S-adenosyl-L-methionine binding [GO:1904047]; thiopurine S-methyltransferase activity [GO:0008119]...
S-adenosyl-L-methionine binding [GO:1904047]; thiopurine S-methyltransferase activity [GO:0008119]
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GO - Cellular component (CC):
cytosol [GO:0005829]...
cytosol [GO:0005829]
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