| Literature DB >> 11389834 |
J D Reimann1, E Freed, J Y Hsu, E R Kramer, J M Peters, P K Jackson.
Abstract
We have discovered an early mitotic inhibitor, Emi1, which regulates mitosis by inhibiting the anaphase promoting complex/cyclosome (APC). Emi1 is a conserved F box protein containing a zinc binding region essential for APC inhibition. Emi1 accumulates before mitosis and is ubiquitylated and destroyed in mitosis, independent of the APC. Emi1 immunodepletion from cycling Xenopus extracts strongly delays cyclin B accumulation and mitotic entry, whereas nondestructible Emi1 stabilizes APC substrates and causes a mitotic block. Emi1 binds the APC activator Cdc20, and Cdc20 can rescue an Emi1-induced block to cyclin B destruction. Our results suggest that Emi1 regulates progression through early mitosis by preventing premature APC activation, and may help explain the well-known delay between cyclin B/Cdc2 activation and cyclin B destruction.Entities:
Mesh：
Substances：
Year: 2001 PMID： 11389834 DOI： 10.1016/s0092-8674(01)00361-0
Source DB: PubMed Journal: Cell ISSN： 0092-8674 Impact factor: 41.582