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Eytan E , Braunstein L , Ganoth D , Teichner A , Hittle JC , Yen TJ , Hershko A
Two different mitotic checkpoint inhibitors of the anaphase-promoting complex/cyclosome antagonize the action of the activator Cdc20
Proceedings of the National Academy of Sciences of the United States of America. 2008 Jul;105(27) :9181-9185
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Abstract
The mitotic checkpoint system ensures the fidelity of chromosome segregation by preventing the completion of mitosis in the presence of any misaligned chromosome. When activated, it blocks the initiation of anaphase by inhibiting the ubiquitin ligase anaphase-promoting complex/cyclosome (APC/C). Little is known about the biochemical mechanisms by which this system inhibits APC/C, except for the existence of a mitotic checkpoint complex (MCC) inhibitor of APC/C composed of the APC/C activator Cdc20 associated with the checkpoint proteins Mad2, BubR1, and Bub3. We have been studying the mechanisms of the mitotic checkpoint system in extracts that reproduce its downstream events. We found that inhibitory factors are associated with APC/C in the checkpoint-arrested state, which can be recovered from immunoprecipitates. Only a part of the inhibitory activity was caused by MCC [Braunstein I, Miniowitz S, Moshe Y, Hershko A (2007) Proc Natl Acad Sci USA 104:4870-4875]. Here, we !
Notes
Eytan, Esther Braunstein, Llana Ganoth, Dvora Teichner, Adar Hittle, James C. Yen, Tim J. Hershko, Avram NATL ACAD SCIENCES