UBE3B Antibody – Rabbit Polyclonal

The modification of proteins with ubiquitin is an important cellular mechanism for targeting abnormal or short-lived proteins for degradation. Ubiquitination involves at least three classes of enzymes: E1 ubiquitin-activating enzymes, E2 ubiquitin-conjugating enzymes, and E3 ubiquitin-protein ligases. This gene encodes a member of the E3 ubiquitin-conjugating enzyme family which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme and transfers the ubiquitin to the targeted substrates. A HECT (homology to E6-AP C-terminus) domain in the C-terminus of the longer isoform of this protein is the catalytic site of ubiquitin transfer and forms a complex with E2 conjugases. Shorter isoforms of this protein which lack the C-terminal HECT domain are therefore unlikely to bind E2 enzymes. Alternatively spliced transcript variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jul 2012]

UBE3B: E3 ubiquitin-protein ligase which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. 3 isoforms of the human protein are produced by alternative splicing.

Protein type: Ligase; EC 6.3.2.19; EC 6.3.2.-; Ubiquitin ligase; Ubiquitin conjugating system

Chromosomal Location of Human Ortholog: 12q24.11

Molecular Function: ligase activity; ubiquitin-protein ligase activity

Biological Process: protein ubiquitination during ubiquitin-dependent protein catabolic process

Disease: Kaufman Oculocerebrofacial Syndrome