Abstract
Three enzymes of sulfur metabolism are simultaneously lost in the cys-3 mutant of Neurospora. Revertants of cys-3 have been selected and appear to arise from mutation within the original locus. The revertants can be grouped into at least three classes according to the amounts of the enzymic activities that are restored and by temperature sensitivity. The properties of the revertant strains indicate that the cys-3 mutant is not a large deletion, a super-repressor mutation, or an extreme polar mutant; nor does the cys-3 locus code for a polypeptide chain common to the three enzymes. We suggest that cys-3 is a regulatory gene which exerts positive control over enzyme synthesis.
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