Transferases;
Acyltransferases;
Aminoacyltransferases
BRITE hierarchy

[E2 ubiquitin-conjugating enzyme]-S-ubiquitinyl-L-cysteine:acceptor protein ubiquitin transferase (isopeptide bond-forming; RCR-type)

[E2 ubiquitin-conjugating enzyme]-S-ubiquitinyl-L-cysteine + [acceptor protein]-L-threonine = [E2 ubiquitin-conjugating enzyme]-L-cysteine + [acceptor protein]-3-O-ubiquitinyl-L-threonine (overall reaction);
(1a) [E2 ubiquitin-conjugating enzyme]-S-ubiquitinyl-L-cysteine + [RCR-type E3 ubiquitin transferase]-L-cysteine = [E2 ubiquitin-conjugating enzyme]-L-cysteine + [RCR-type E3 ubiquitin transferase]-S-ubiquitinyl-L-cysteine;
(1b) [RCR-type E3 ubiquitin transferase]-S-ubiquitinyl-L-cysteine + [acceptor protein]-L-threonine = [RCR-type E3 ubiquitin transferase]-L-cysteine + [acceptor protein]-3-O-ubiquitinyl-L-threonine

[E2 ubiquitin-conjugating enzyme]-S-ubiquitinyl-L-cysteine;
[acceptor protein]-L-threonine;
[RCR-type E3 ubiquitin transferase]-L-cysteine;
[RCR-type E3 ubiquitin transferase]-S-ubiquitinyl-L-cysteine

RCR-type E3 ubiquitin transferases is a class of RING-type E3 ubiquitin transferase (see EC 2.3.2.27) that mediates ubiquitylation of acceptor proteins via an internal cysteine residue. The RING1 domain binds an EC 2.3.2.23, E2 ubiquitin-conjugating enzyme, and transfers the ubiquitin that is bound to it to an internal cysteine residue on a mediator loop of the RCR-type ligase. The ubiquitin may be transferred to a second internal cysteine before the transfer of the ubiquitin from the RCR-type ligase to the substrate.

EC 2.3.2.33 created 2019

1  [PMID:29643511]