Cdc20: a WD40 activator for a cell cycle degradation machine.
Cdc20 is an essential cell-cycle regulator required for the completion of mitosis in organisms from yeast to man and contains at its C terminus a WD40 repeat domain that mediates protein-protein interactions. In mitosis, Cdc20 binds to and activates the ubiquitin ligase activity of a large molecular machine called the anaphase-promoting complex/cyclosome (APC/C) and enables the ubiquitination and degradation of securin and cyclin B, thus promoting the onset of anaphase and mitotic exit. APC/C(Cdc20) is temporally and spatially regulated during the somatic and embryonic cell cycle by numerous mechanisms, including the spindle checkpoint and the cytostatic factor (CSF). Therefore, Cdc20 serves as an integrator of multiple intracellular signaling cascades that regulate progression through mitosis. This review summarizes recent progress toward the understanding of the functions of Cdc20, the mechanisms by which it activates APC/C, and its regulation by phosphorylation and by association with its binding proteins.
Yu
Hongtao
H
Department of Pharmacology, The University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390-9041, USA. hongtao.yu@utsouthwestern.edu
D064173:Anaphase-Promoting Complex-Cyclosome; D000818:Animals; D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D020449:Repetitive Sequences, Amino Acid; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D043743:Ubiquitin-Protein Ligase Complexes / Q000378:metabolism
D018797:Cell Cycle Proteins; D043743:Ubiquitin-Protein Ligase Complexes; D064173:Anaphase-Promoting Complex-Cyclosome