Fission yeast Fizzy-related protein srw1p is a G1-specific promoter of mitotic cyclin B degradation

AUTOR(ES)

Yamaguchi, Satoko

FONTE

Oxford University Press

RESUMO

Downregulation of cyclin-dependent kinase (Cdk)–mitotic cyclin complexes is important during cell cycle progression and in G1 arrested cells undergoing differentiation. srw1p, a member of the Fizzy-related protein family in fission yeast, is required for the degradation of cdc13p mitotic cyclin B during G1 arrest. Here we show that srw1p is not required for the degradation of cdc13p during mitotic exit demonstrating that there are two systems operative at different stages of the cell cycle for cdc13p degradation, and that srw1p is phosphorylated by Cdk–cdc13p only becoming dephosphorylated during G1 arrest. We propose that this phosphorylation targets srw1p for proteolysis and inhibits its activity to promote cdc13p turnover.

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