Mad2 and Mad3 Cooperate to Arrest Budding Yeast in Mitosis

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Mad2 and Mad3 Cooperate to Arrest Budding Yeast in Mitosis

Show simple item record Murray, Andrew W. Lau, Derek T. C. 2012-02-17T18:32:14Z 2012
dc.identifier.citation Lau, Derek T. C. and Andrew W. Murray. 2012. Mad2 and Mad3 cooperate to arrest budding yeast in mitosis. Current BIology 22(3): 180-190. en_US
dc.identifier.issn 0960-9822 en_US
dc.identifier.issn 1879-0445 en_US
dc.description.abstract Background: The spindle checkpoint ensures accurate chromosome transmission by delaying chromosome segregation until all chromosomes are correctly aligned on the mitotic spindle. The checkpoint is activated by kinetochores that are not attached to microtubules or are attached but not under tension and arrests cells at metaphase by inhibiting the anaphase-promoting complex (APC) and its coactivator Cdc20. Despite numerous studies, we still do not understand how the checkpoint proteins coordinate with each other to inhibit \(APC^{Cdc20}\) activity. Results: To ask how the checkpoint components induce metaphase arrest, we constructed fusions of checkpoint proteins and expressed them in the budding yeast Saccharomyces cerevisiae to mimic possible protein interactions during checkpoint activation. We found that expression of a Mad2-Mad3 protein fusion or noncovalently linked Mad2 and Mad3, but not the overexpression of the two separate proteins, induces metaphase arrest that is independent of functional kinetochores or other checkpoint proteins. We further showed that artificially tethering Mad2 to Cdc20 also arrests cells in metaphase independently of other checkpoint components. Conclusion: Our results suggest that Mad3 is required for the stable binding of Mad2 to Cdc20 in vivo, which is sufficient to inhibit APC activity and is the most downstream event in spindle checkpoint activation. en_US
dc.description.sponsorship Molecular and Cellular Biology en_US
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.relation.isversionof doi:10.1016/j.cub.2011.12.029 en_US
dash.license OAP
dc.title Mad2 and Mad3 Cooperate to Arrest Budding Yeast in Mitosis en_US
dc.type Journal Article en_US
dc.description.version Author's Original en_US
dc.relation.journal Current Biology en_US Murray, Andrew W. 2012-02-17T18:32:14Z

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