SUMO-Conjugating Enzyme UBC9 (UBE2I) Recombinant Protein

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. [provided by RefSeq, Jul 2008]

Function: Accepts the ubiquitin-like proteins SUMO1, SUMO2, SUMO3 and SUMO4 from the UBLE1A-UBLE1B E1 complex and catalyzes their covalent attachment to other proteins with the help of an E3 ligase such as RANBP2 or CBX4. Can catalyze the formation of poly-SUMO chains. Necessary for sumoylation of FOXL2 and KAT5. Essential for nuclear architecture and chromosome segregation. Ref.1 Ref.19 Ref.24 Ref.33 Ref.34 Ref.42 Ref.43

Catalytic activity: ATP + SUMO + protein lysine = AMP + diphosphate + protein N-SUMOyllysine.

Pathway: Protein modification; protein sumoylation.

Subunit structure: Interacts with HIPK1, HIPK2, PPM1J, RASD2 and TCF3 Interacts with NR2C1; the interaction promotes its sumoylation

By similarity. Forms a tight complex with RANGAP1 and RANBP2. Interacts with SIAH1 and PARP. Interacts with various transcription factors such as TFAP2A, TFAP2B, TFAP2C, AR, ETS1 and SOX4. Interacts with RWDD3; the interaction enhances the sumoylation of a number of proteins such as HIF1A and I-kappa-B. Interacts with DNMT1. Interacts with FOXL2. Forms a complex with SENP6 and UBE2I in response to UV irradiation. Interacts with human herpesvirus 6 IE2. Interacts with human adenovirus early E1A protein; this interaction interferes with polysumoylation

Probable. Interacts with DNM1l (via its GTPase and B domains); the interaction promotes sumoylation of DNM1L, mainly in its B domain. Interacts with PML-RARA oncoprotein (via the coiled-colied domain); the interaction is required for sumoylation of the PML-RARA oncoprotein. Interacts with IPO13. Interacts with NFATC2IP; this inhibits formation of poly-SUMO chains. Ref.4 Ref.16 Ref.17 Ref.18 Ref.20 Ref.22 Ref.23 Ref.24 Ref.25 Ref.27 Ref.28 Ref.29 Ref.32 Ref.33 Ref.34 Ref.36 Ref.42 Ref.43

Subcellular location: Nucleus. Cytoplasm. Note: Mainly nuclear. In spermatocytes, localizes in synaptonemal complexes. Recruited by BCL11A into the nuclear body

By similarity. Ref.27 Ref.33

Tissue specificity: Expressed in heart, skeletal muscle, pancreas, kidney, liver, lung, placenta and brain. Also expressed in testis and thymus. Ref.5

Sequence similarities: Belongs to the ubiquitin-conjugating enzyme family.

Sequence caution: The sequence AAH51289.3 differs from that shown. Reason: Erroneous initiation. Translation N-terminally shortened.The sequence BAD92225.1 differs from that shown. Reason: Erroneous initiation. Translation N-terminally shortened.