APC15 mediates CDC20 autoubiquitylation by APC/C(MCC) and disassembly of the mitotic checkpoint complex.

The anaphase-promoting complex/cyclosome (APC/C) bound to CDC20 (APC/C(CDC20)) initiates anaphase by ubiquitylating B-type cyclins and securin. During chromosome bi-orientation, CDC20 assembles with MAD2, BUBR1 and BUB3 into a mitotic checkpoint complex (MCC) that inhibits substrate recruitment to the APC/C. APC/C activation depends on MCC disassembly, which was proposed to require ...
CDC20 autoubiquitylation. Here we characterize APC15, a human APC/C subunit related to yeast Mnd2. APC15 is located near APC/C's MCC binding site; it is required for APC/C-bound MCC (APC/C(MCC))-dependent CDC20 autoubiquitylation and degradation and for timely anaphase initiation but is dispensable for substrate ubiquitylation by APC/C(CDC20) and APC/C(CDH1). Our results support the model wherein MCC is continuously assembled and disassembled to enable rapid activation of APC/C(CDC20) and CDC20 autoubiquitylation promotes MCC disassembly. We propose that APC15 and Mnd2 negatively regulate APC/C coactivators and report generation of recombinant human APC/C.
Mesh Terms:
Calcium-Binding Proteins, Cell Cycle Proteins, HeLa Cells, Humans, Immunoprecipitation, M Phase Cell Cycle Checkpoints, Microscopy, Electron, Microscopy, Fluorescence, Models, Biological, Protein-Serine-Threonine Kinases, RNA Interference, RNA, Small Interfering, Repressor Proteins, Time-Lapse Imaging, Ubiquitin-Protein Ligase Complexes, Ubiquitination
Nat. Struct. Mol. Biol.
Date: Nov. 01, 2012
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