期刊
MOLECULAR CELL
卷 24, 期 4, 页码 523-534出版社
CELL PRESS
DOI: 10.1016/j.molcel.2006.10.010
关键词
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资金
- NIGMS NIH HHS [R01 GM065997, F32 GM074471-01] Funding Source: Medline
Release of ubiquitin-charged Cdc34 from the SCF ubiquitin ligase followed by diffusion-driven collision with substrate has been proposed to underlie ubiquitination of the canonical SCF substrate Sic1. Cdc34 F72V, reported to be defective in dissociation from SCF, served as key validation. Here, we test predictions of this hit-and-run hypothesis. We find that Cdc34 F72V is generally defective in SCIF-mediated activation but, contrary to expectation, does not compete with wild-type Cdc34 in vitro or in vivo and can fulfill the physiological role of Cdc34 with only moderate delay in Sic1 turnover. Whereas a hit-and-run mechanism might explain how Cdc34 can transfer ubiquitin to the ends of growing ubiquitin chains on SCF-bound substrates, molecular modeling suggests that an E2 docked to SCF can do so without dissociating. We propose that interactions between Cdc34 similar to Ub and SCF directly activate ubiquitin transfer within a substrateSCF similar to Cdc34 similar to Ub ternary complex.
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