Background: APC7 is one of the subunits of the Anaphase Promoting Complex. APC7 (anaphase-promoting complex subunit 7) is a member of the E3 enzyme family. This protein contains TPR repeats and has a molecular weight of approximately 63 kD. The APC7 protein is located in the nucleus during interphase and the centrosome during metaphase/anaphase. This protein probably recruits Cdh1 into the APC complex. The APC7 protein functions with other members of the APC complex as a multisubunit cell cycle ubiquitin ligase, and a regulator of sister chromatid separation by degrading securins. In addition, this protein functions in ubiquitin-dependent cyclin catabolism, metaphase/anaphase transition, and spindle elongation. The APC6 protein comprises one subunit of the anaphase promoting complex including APC1-8, and other probable complex proteins APC9-11, Cdc26, Mnd2, Swm1. The APC complex is inactivated by protein kinase A and is activated by CDC20 and Cdh1.