Reference: Mendenhall MD, et al. (1987) Dual regulation of the yeast CDC28-p40 protein kinase complex: cell cycle, pheromone, and nutrient limitation effects. Cell 50(6):927-35

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Abstract


A 40 kd polypeptide that coprecipitates with the CDC28 gene product in immune complexes is specifically phosphorylated by the CDC28 protein kinase. Using this reaction, we detect activity only in extracts from dividing G1 phase cells. Exit from G1 by entry into S phase or the preconjugatory state induced by mating pheromone correlates with loss of p40 phosphorylation activity. Inactive extracts from cdc28 mutants complement extracts from cells arrested in S or M phase, suggesting that non-G1 cells are deficient in an exchangeable activating factor. Stationary and pheromone-treated cultures are rich in this exchangeable factor, but possess an inactive kinase that is not activated by complementation. cAMP-deficient mutants resemble stationary cells.

Reference Type
Comparative Study | Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
Authors
Mendenhall MD, Jones CA, Reed SI
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