Description_x000D_ General description_x000D_ This gene encodes the enzyme that metabolizes thiopurine drugs via S-adenosyl-L-methionine as the S-methyl donor and S-adenosyl-L-homocysteine as a byproduct. Thiopurine drugs such as 6-mercaptopurine are used as chemotherapeutic agents. Genetic polymorphisms that affect this enzymatic activity are correlated with variations in sensitivity and toxicity to such drugs within individuals. A pseudogene for this locus is located on chromosome 18q. (provided by RefSeq)_x000D_ Immunogen_x000D_ TPMT (AAH05339, 1 a.a. ~ 245 a.a) full-length recombinant protein with GST tag. MW of the GST tag alone is 26 KDa._x000D_ Sequence_x000D_ MDGTRTSLDIEEYSDTEVQKNQVLTLEEWQDKWVNGKTAFHQEQGHQLLKKHLDTFLKGKSGLRVFFPLCGKAVEMKWFADRGHSVVGVEISELGIQEFFTEQNLSYSEEPITEIPGTKVFKSSSGNISLYCCSIFDLPRTNIGKFDMIWDRGALVAINPGDRKCYADTMFSLLGKKFQYLLCVLSYDPTKHPGPPFYVPHAEIERLFGKICNIRRLEKVDAFEERHKSWGIDCLFEKLYLLTEK_x000D_ Physical form_x000D_ Solution in phosphate buffered saline, pH 7.4_x000D_ Biochem/physiol Actions_x000D_ TPMT (Thiopurine S-methyltransferase) mainly mediates different catalytic S-methylation reaction such as 6-mercaptopurine and 6-thioguanine. It also participates in the metabolism of some drugs such as thiopurine drugs, which is largely influenced by TPMT polymorphisms. Deficiency in TPMT gene causes an autosomal recessive disorder, childhood acute lymphoblastic leukemia.