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Exposure of yeast a cells to alpha-factor causes cells to arrest in the G1 phase of the cell cycle. The FAR1 gene is required for this cell-cycle arrest; its product is necessary for the inhibition of a G1 cyclin, CLN2. Earlier work demonstrated that alpha-factor caused an increase in the transcription of FAR1 severalfold over a measurable basal level. We now show that transcriptional induction of FAR1 from a heterologous promoter is not sufficient to inhibit CLN2 in the absence of alpha-factor. We also show that FAR1 is phosphorylated in response to alpha-factor and propose that this phosphorylation may be required for FAR1 activity.

Phosphorylation of FAR1 in response to alpha-factor: a possible requirement for cell-cycle arrest.