A plus-end-directed motor enzyme that moves antiparallel microtubules in vitro localizes to the interzone of mitotic spindles. |
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Authors: | C Nislow V A Lombillo R Kuriyama J R McIntosh |
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Institution: | Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder 80309. |
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Abstract: | Mitosis comprises a complex set of overlapping motile events, many of which involve microtubule-dependent motor enzymes. Here we describe a new member of the kinesin superfamily. The protein was originally identified as a spindle antigen by the CHO1 monoclonal antibody and shown to be required for mitotic progression. We have cloned the gene that encodes this antigen and found that its sequence contains a domain with strong sequence similarity to the motor domain of kinesin-like proteins. The product of this gene, expressed in bacteria, can cross-bridge antiparallel microtubules in vitro, and in the presence of Mg-ATP, microtubules slide over one another in a fashion reminiscent of microtubule movements during spindle elongation. |
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