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Biosynthesis of Sulphur Amino Acids in Saccharomyces Cerevisiae: Regulatory Roles of Methionine and S-adenosylmethionine Reassessed

Overview
Journal Curr Genet
Specialty Genetics
Date 1992 Oct 1
PMID 1394507
Citations 6
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Abstract

cys4-1, a mutation in the reverse trans-sulphuration pathway, relieves the sulphate assimilation pathway and homocysteine synthase from methionine-mediated repression. Since the mutation blocks the synthesis of cysteine from methionine downstream from homocysteine, this indicates that neither methionine nor S-adenosylmethionine serve as low-molecular-mass effectors in this regulatory system, contradicting earlier hypotheses.

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