Abstract
Dihydrofolate (H 2-folate) synthetase (EC 6.3.2.12) was isolated from Escherichia coli B. A radiochemical assay was developed to determine the activity of H 2-folate synthetase in order to study the effects of folate metabolites and antimetabolites which would interfere with the microbiological assay method previously used. The effects of folate and pteroate derivatives on the activity of this enzyme were investigated to determine if inhibition of this enzyme could constitute a site of action for these compounds as chemotherapeutic agents or a site of metabolic regulation. H 2-folate synthetase was inhibited by its product, H 2-folate, and by the antimetabolite dihydrohomopteroate, with apparent K i values of 23.4 and 9.2 μM, respectively.
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