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- W2472979924 abstract "Tetrahydropteroylpolyglutamates with longer gamma-glutamyl chain lengths have been found to act as better cofactors than the corresponding monoglutamates for the activity of thymidylate synthase, (5, 10-CH2H4PteGlu: dUMP C-methyltransferase, EC 2.1.1.45) purified from Lactobacillus leichmannii. Contrarily, the pteroylpolyglutamates (unreduced forms) with longer gamma-glutamyl chain lengths act as powerful inhibitors of the same enzyme, the I50 being 2 microM for the tetraglutamate, and inhibition is competitive. The Km and Ki values for the synthetic folylpolyglutamates are identical to those obtained for the natural folylpolyglutamyl forms isolated from Torula yeast (Candida utilis) by the author earlier. A rapid novel method is suggested that could be conveniently used to determine the gamma-glutamyl chain lengths of the folylpolyglutamates employing the direct or indirect linear proportionality relationship observed between the number of gamma-glutamyl residues linked and the Ki and Km values of the enzyme considering the state of oxidation/reduction of the pteridine moiety and the 1-C substituents attached." @default.
- W2472979924 created "2016-07-22" @default.
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- W2472979924 date "1994-06-01" @default.
- W2472979924 modified "2023-09-23" @default.
- W2472979924 title "Pteroyl- and tetrahydropteroylpolyglutamate effects on the catalytic activity of thymidylate synthase from Lactobacillus leichmannii: a novel method for determining gamma-glutamyl chain lengths of the folylpolyglutamates." @default.
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