Degradation of the kinesin Kip1p at anaphase onset is mediated by the anaphase-promoting complex and Cdc20p

Proceedings of the National Academy of Sciences of the United States of America
D M Gordon, D M Roof

Abstract

Kip1p of Saccharomyces cerevisiae is a bipolar kinesin in the conserved bimC kinesin subfamily that mediates mitotic spindle-pole separation. Here, we show that Kip1p is regulated immediately after anaphase initiation by its rapid degradation. Degradation required the ubiquitin protein ligase called the anaphase-promoting complex, the anaphase-promoting complex activating protein Cdc20, and a unique 43-aa sequence in Kip1p. Degradation also required import of Kip1p into the nucleus, but occurred independently of spindle association. A mutation that stabilized Kip1p impaired anaphase progression. The timing of degradation suggests that Kip1p functions primarily during spindle assembly and metaphase, and that Kip1p degradation facilitates structural changes in the mitotic spindle as anaphase progresses.

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Nov 26, 2010·Quarterly Reviews of Biophysics·David Barford
Jan 22, 2010·Molecular Biology of the Cell·Jonathan A Robbins, Frederick R Cross
Nov 16, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·David Barford
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