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- W1772164604 abstract "The spindle assembly checkpoint (SAC) restrains anaphase until all chromosomes become bi-oriented on the mitotic spindle. The SAC protein Mad2 can fold into two distinct conformers, open (O) and closed (C), and can asymmetrically dimerize. Here, we describe a monoclonal antibody that specifically recognizes the dimerization interface of C-Mad2. This antibody revealed several conformation-specific features of Mad2 in human cells. Notably, we show that Mad2 requires association with Mad1 to adopt the closed conformation and that the activity of the Mad1:C-Mad2 complex undergoes regulation by p31comet-dependent 'capping'. Furthermore, C-Mad2 antibody microinjection caused an abrupt termination of the SAC and accelerated mitotic progression. Remarkably, microinjection of a Mad1-neutralizing antibody triggered a comparable mitotic acceleration. Our study provides direct in vivo evidence for the model that a kinetochore complex of Mad1:C-Mad2 acts as a template to sustain the SAC and it challenges the distinction between SAC and mitotic timer." @default.
- W1772164604 created "2016-06-24" @default.
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- W1772164604 date "2011-07-19" @default.
- W1772164604 modified "2023-09-23" @default.
- W1772164604 title "Probing thein vivofunction of Mad1:C-Mad2 in the spindle assembly checkpoint" @default.
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- W1772164604 doi "https://doi.org/10.1038/emboj.2011.239" @default.
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