
Life Sciences p. 343 - 350 (1997)
Update date:2022-08-12
Topics:
Stupans, Ieva
Kirlich, Amra
McKinnon, Ross A.
A HPLC assay was developed to assay baculovirus expressed human thiopurine methyltransferase activity. Using 6-mercaptopurine as substrate, the expressed thiopurine methyltransferase was found to have an apparent Km of 0.99 mM and a Vmax of 19 nmoles/mg/min. These values are in agreement with those determined using the standard radiometric assay for thiopurine methyltransferase activity. The effects of 6-thioguanine on 6-mercaptopurine metabolism were determined. 6-Thioguanine was found to be a mixed inhibitor of 6-mercaptopurine methylation.
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