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Ubiquitination system

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default Ubiquitination system

Post by taixyz1992 on Mon Nov 22, 2010 11:43 pm

The ubiquitin ligase is referred to as an E3, and operates in conjunction with an E1 ubiquitin-activating enzyme and an E2 ubiquitin-conjugating enzyme. There is one major E1 enzyme, shared by all ubiquitin ligases, which uses ATP to activate ubiquitin for conjugation and transfers it to an E2 enzyme. The E2 enzyme interacts with a specific E3 partner and transfers the ubiquitin to the target protein. The E3, which may be a multi-protein complex, is, in general, responsible for targeting ubiquitination to specific substrate proteins. In some cases, it receives the ubiquitin from the E2 enzyme and transfers it to the target protein; in other cases, it acts by interacting with both the E2 enzyme and the substrate, but never itself receives the ubiquitin.


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