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Tubulin poisons were first discovered decades ago, but the recent clinical and commercial success of Taxol(R) has led to a renaissance in the search for novel mitotic spindle poisons to treat cancer. Many tubulin poisons have been identified, but few have demonstrated clinical utility. Recent studies have begun to identify the factors that differentiate the efficacy of these agents. In addition, promising...
Accurate chromatid separation is monitored by a checkpoint mechanism that delays anaphase onset until all centromeres are correctly attached to the mitotic spindle. Using Xenopus egg extracts, the kinetochore-associated microtubule motor protein CENP-E is now found to be required for establishing and maintaining this checkpoint. When CENP-E function is disrupted by immunodepletion or antibody addition,...
Mitosis requires dynamic attachment of chromosomes to spindle microtubules. This interaction is mediated largely by kinetochores. During prometaphase, forces exerted at kinetochores, in combination with polar ejection forces, drive congression of chromosomes to the metaphase plate. A major question has been whether kinetochore-associated microtubule motors play an important role in congression. Using...
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