Requirements and Reasons for Effective Inhibition of the Anaphase Promoting Complex Activator Cdh1

Jonathan A. Robbins,F. Cross

Published 2010 in Molecular Biology of the Cell

ABSTRACT

Inhibitory phosphorylation of Cdh1 by CDK and Polo kinase has been proposed to inactivate APC-Cdh1. Through an exact gene replacement approach, we find CDK, but not Polo, phosphorylation of Cdh1 to be a critical regulatory mechanism. APC-Cdh1 inhibits multiple aspects of spindle morphogenesis, and its activity is modulated by endogenous ACM1.

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