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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: ubiquitin-activating enzymes, or E1s, ubiquitin-conjugating enzymes, or E2s, and ubiquitin-protein ligases, or E3s. This gene encodes a member of the E2 ubiquitin-conjugating enzyme family. Four alternatively spliced transcript variants encoding the same protein have been found for this gene. Catalyzes the covalent attachment of ubiquitin-like protein SUMO-1 to other proteins. Forms a tight complex in association with two RAN GTPase interacting proteins, RANGAP1 and RANBP2. Interacts with E1A and E2A. Interacts with HIPK1 and HIPK2. Interacts with SIAH1 and PARP. Expressed in heart, skeletal muscle, pancreas, kidney, liver, lung, placenta and brain. Also expressed in testis and thymus.
