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A retraction to this article has been published: Kotani et al., J. Cell Biol. 169 (1) 205
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J. Cell Biol., Volume 146, Number 4, August 23, 1999 791-800
Copyright © 1999 by The Rockefeller University Press.

Regulation of APC Activity by Phosphorylation and Regulatory Factors

Shuji Kotania, Hirofumi Tanakab, Hideyo Yasudab, and Kazuo Todokoroa
a Tsukuba Life Science Center, The Institute of Physical and Chemical Research, Tsukuba, Ibaraki 305-0074, Japan
b School of Life Science, Tokyo University of Pharmacy and Life Science, Hachiooji, Tokyo 192-0355, Japan

Correspondence to: Kazuo Todokoro, Tsukuba Life Science Center, The Institute of Physical and Chemical Research (RIKEN), 3-1, Koyadai, Tsukuba, Ibaraki 305-0074, Japan. Tel:81-298-36-9075 Fax:81-298-36-9090 E-mail:todokoro{at}rtc.riken.go.jp.

Ubiquitin-dependent proteolysis of Cut2/Pds1 and Cyclin B is required for sister chromatid separation and exit from mitosis, respectively. Anaphase-promoting complex/cyclosome (APC) specifically ubiquitinates Cut2/Pds1 at metaphase–anaphase transition, and ubiquitinates Cyclin B in late mitosis and G1 phase. However, the exact regulatory mechanism of substrate-specific activation of mammalian APC with the right timing remains to be elucidated. We found that not only the binding of the activators Cdc20 and Cdh1 and the inhibitor Mad2 to APC, but also the phosphorylation of Cdc20 and Cdh1 by Cdc2-Cyclin B and that of APC by Polo-like kinase and cAMP-dependent protein kinase, regulate APC activity. The cooperation of the phosphorylation/dephosphorylation and the regulatory factors in regulation of APC activity may thus control the precise progression of mitosis.

Key Words: anaphase-promoting complex, Cdc20, Cdh1, Mad2, phosphorylation


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