Genetics, Vol 138, 39-45, Copyright © 1994

INVESTIGATIONS

Glucose Repression of fbp1 Transcription in Schizosaccharomyces pombe Is Partially Regulated by Adenylate Cyclase Activation by a G Protein {alpha} Subunit Encoded by gpa2 (git8)

M. Nocero, T. Isshiki, M. Yamamoto and C. S. Hoffman
Department of Biology, Boston College, Chestnut Hill, Massachusetts 02167

In the fission yeast Schizosaccharomyces pombe, genetic studies have identified genes that are required for glucose repression of fbp1 transcription. The git2 gene, also known as cyr1, encodes adenylate cyclase. Adenylate cyclase converts ATP into the second messenger cAMP as part of many eukaryotic signal transduction pathways. The git1, git3, git5, git7, git8 and git10 genes act upstream of adenylate cyclase, presumably encoding an adenylate cyclase activation pathway. In mammalian cells, adenylate cyclase enzymatic activity is regulated by heterotrimeric guanine nucleotide-binding proteins (G proteins). In the budding yeast Saccharomyces cerevisiae, adenylate cyclase enzymatic activity is regulated by monomeric, guanine nucleotide-binding Ras proteins. We show here that git8 is identical to the gpa2 gene that encodes a protein homologous to the {alpha} subunit of a G protein. Mutations in two additional genes, git3 and git5 are suppressed by gpa2(+) in high copy number. Furthermore, a mutation in either git3 or git5 has an additive effect in strains deleted for gpa2 (git8), as it significantly increases expression of an fbp1-lacZ reporter gene. Therefore, git3 and git5 appear to act either in concert with or independently from gpa2 (git8) to regulate adenylate cyclase activity.

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