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. 1986 May;6(5):1820–1829. doi: 10.1128/mcb.6.5.1820

New positive and negative regulators for general control of amino acid biosynthesis in Saccharomyces cerevisiae.

M L Greenberg, P L Myers, R C Skvirsky, H Greer
PMCID: PMC367712  PMID: 3537709

Abstract

The biosynthesis of most amino acids in Saccharomyces cerevisiae is coregulated. Starvation for a single amino acid results in the derepression of amino acid biosynthetic enzymes in many unrelated pathways. This phenomenon, known as general control, is mediated by both positive (GCN) and negative (GCD) regulatory genes. In this paper we describe the identification and characterization of several new regulatory genes for this system, GCN6, GCN7, GCN8, GCN9, and GCD5. A mutation in the negative regulator GCD5 was isolated on the basis of its suppression of a gcn2 mutation. The effect of gcd5 is a posttranscriptional increase in histidine biosynthetic enzyme activity. Suppressors of gcd5 which are deficient in derepression were in turn isolated. Eight such mutations, defining four new positive regulatory genes (GCN6 through GCN9), were obtained. These mutations are recessive, confer sensitivity to multiple amino acid analogs, and result in decreased mRNA levels for genes under general control. The GCN6 and GCN7 gene products were shown to be positive regulators for transcription of the GCN4 gene, the most direct-acting positive regulator thus far identified. The interaction of GCN6 and GCN7 with GCN4 is fundamentally different from that of previously isolated GCN genes. It should also be noted that these gcn selections gave a completely different nonoverlapping set of mutations from earlier selections which relied on analog sensitivity. Thus, we may have identified a new class of GCN genes which are functionally distinct from GCN1 through GCN5.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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