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EC 6.2.1.45 Details
show Brenda entryEC number
6.2.1.45
Accepted name
E1 ubiquitin-activating enzyme
Reaction
ATP + ubiquitin + [E1 ubiquitin-activating enzyme]-L-cysteine = AMP + diphosphate + S-ubiquitinyl-[E1 ubiquitin-activating enzyme]-L-cysteine
Other name(s)
ubiquitin activating enzyme,
E1,
ubiquitin-activating enzyme E1
Systematic name
ubiquitin:[E1 ubiquitin-activating enzyme] ligase (AMP-forming)
Comment
Catalyses the ATP-dependent activation of ubiquitin through the formation of a thioester bond between the C-terminal glycine of ubiquitin and the sulfhydryl side group of a cysteine residue in the E1 protein. The two-step reaction consists of the ATP-dependent formation of an E1-ubiquitin adenylate intermediate in which the C-terminal glycine of ubiquitin is bound to AMP via an acyl-phosphate linkage, then followed by the conversion to an E1-ubiquitin thioester bond via the cysteine residue on E1 in the second step.
History
created 2015
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.14.14.2 created 1972, deleted 1976 1.14.14.4 created 2000, deleted 2002
