Thymidine 5'-monophosphate-requiring mutants of Saccharomyces cerevisiae are deficient in thymidylate synthetase.

Abstract

Thymidylate synthetase activity was measured in crude extracts of the yeast Saccharomyces cerevisiae by a sensitive radiochemical assay. Spontaneous non-conditional mutants auxotrophic for thymidine 5'-monophosphate (tmp1) lacked detectable thymidylate synthetase activity in cell-free extracts. In contrast, the parent strains (tup1, -2, or -4), which were… (More)

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