Abstract:Kar3Cik1 is a S. cerevisae Kinesin-14 motor protein that functions to shorten cytoplasmic microtubule (MT) during yeast mating for nuclear fusion, yet crosslinks interpolar MTs (ipMTs) during anaphase. The Kar3 head contains both an ATP and MT binding site, yet the Cik1 head lacks an ATP catalytic site. Presteady-state and steady state experiments were conducted to define the mechanochemical pathway by which Kar3Cik1 stabilizes anti-parallel ipMTs for its mitotic function. To initiate the cycle, we used a high… Show more
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