Journal of the American Chemical Society p. 3192 - 3198 (1981)
Update date:2022-08-25
Topics:
Maggiora, Linda
Chang, Charles C. T.-C.
Torrence, Paul F.
Mertes, Mathias P.
5-Nitro-2'-deoxyuridine 5'-phosphate (2) was found to be a mechanism-based affinity label for thymidylate synthetase purified from amethopterin resistant Lactobacillius casei.The inhibition proceeds in two steps via the initial formation of the noncovalent complex 3 (Ki = 5<*>10-7 M) which is converted to the covalent complex 4. The net dissociation constant for the overall sequence is 6.5<*>10-10 M, a value predicted from model studies of the bimolecular reaction of 2-mercaptoethanol with 5-nitrouridine or 2.
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