Mitotic regulation of the anaphase-promoting complex

被引:79
作者
Baker, D. J.
Dawlaty, M. M.
Galardy, P.
van Deursen, J. M.
机构
[1] Mayo Clin, Dept Pediat & Adolescent Med, Rochester, MN 55905 USA
[2] Mayo Clin, Dept Biochem & Mol Biol, Rochester, MN 55905 USA
关键词
anaphase-promoting complex; APC/C; spindle assembly checkpoint; Cdc20; Cdh1;
D O I
10.1007/s00018-007-6443-1
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Orderly progression through mitosis is regulated by the anaphase-promoting complex/cyclosome (APC/C), a large multiprotein E3 ubiquitin ligase that targets key mitotic regulators for destruction by the proteasome. APC/C has two activating subunits, Cdc20 and Cdh1. The well-established view is that Cdc20 activates APC/C from the onset of mitosis through the metaphase-anaphase transition, and that Cdh1 does so from anaphase through G1. Recent work, however, indicates that Cdh1 also activates APC/C in early mitosis and that this APC/C pool targets the anaphase inhibitor securin. To prevent premature degradation of securin, the nuclear transport factors Nup98 and Rae1 associate with APC/C-Cdh1-securin complexes. In late metaphase, when all kinetochores are attached to spindle microtubules and the spindle assembly checkpoint is satisfied, Nup98 and Rae1 are released from these complexes, thereby allowing for prompt ubiquitination of securin by APC/C-Cdh1. This, and other mechanisms by which the catalytic activity of APC/C is tightly regulated to ensure proper timing of degradation of each of its mitotic substrates, are highlighted.
引用
收藏
页码:589 / 600
页数:12
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