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Mol. Cell. Biol., 06 1996, 2830-2837, Vol 16, No. 6
LJ Oehlen, JD McKinney and FR Cross
The transcripts of many genes involved in Saccharomyces cerevisiae mating
were found to fluctuate during the cell cycle. In the absence of a
functional Ste12 transcription factor, both the levels and the cell cycle
pattern of expression of these genes were affected. FUS1 and AGA1 levels,
which are maximally expressed only in G1-phase cells, were strongly reduced
in ste12- cells. The cell cycle transcription pattern for FAR1 was changed
in ste12- cells: the gene was still significantly expressed in G2/M, but
transcript levels were strongly reduced in G1 phase, resulting in a lack of
Far1 protein accumulation. G2/M transcription of FAR1 was dependent on the
transcription factor Mcm1, and expression of a gene with Mcm1 fused to a
strong transcriptional activation domain resulted in increased levels of
FAR1 transcription. The pattern of cell cycle-regulated transcription of
FAR1 could involve combinatorial control of Ste12 and Mcm1. Forced G1
expression of FAR1 from the GAL1 promoter resorted the ability to arrest in
response to pheromone in ste12-cells. This indicates that transcription of
FAR1 in the G1 phase is essential for accumulation of the protein and for
pheromone-induced cell cycle arrest.
Copyright © 1996, American Society for Microbiology
Ste12 and Mcm1 regulate cell cycle-dependent transcription of FAR1
Rockefeller University, New York, New York 10021, USA.
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