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J. Cell Biol.,
Volume 142, Number 3, August 10, 1998 787-801
Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, Washington 98195
Mitotic centromere-associated kinesin
(MCAK) is recruited to the centromere at prophase
and remains centromere associated until after telophase. MCAK is a homodimer that is encoded by a single gene and has no associated subunits. A motorless
version of MCAK that binds centromeres but not microtubules disrupts chromosome segregation during
anaphase. Antisense-induced depletion of MCAK results in the same defect. MCAK overexpression induces
centromere-independent bundling and eventual loss of
spindle microtubule polymer suggesting that centromere-associated bundling and/or depolymerization
activity is required for anaphase. Live cell imaging indicates that MCAK may be required to coordinate the
onset of sister centromere separation.
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