Ubiquitin is an abundant, highly conserved protein found in all eukaryotic cells either free or covalently attached to cellular proteins. The primary function of ubiquitin in mammalian systems is to clear abnormal, foreign and improperly folded proteins by targeting them for proteosome degradation. UBA3 (ubiquitin-like modifier activating enzyme 3), also known as NEDD8-activating enzyme E1 catalytic subunit or UBE1C (ubiquitin-activating enzyme E1C), is a 463 amino acid protein belonging to the ubiquitin-activating E1 family and UBA3 subfamily. Ubiquitously expressed, UBA3 acts as an activator to NEDD8, a ubiquitin-like protein, thus regulating cell division, signaling and embryogenesis. UBA3 exists as two isoforms due to alternative splicing events.
Background References
1. Coleman KE et al. SENP8 limits aberrant neddylation of NEDD8 pathway components to promote cullin-RING ubiquitin ligase function. Elife 6:N/A (2017).
2. Xu J et al. The neddylation-cullin 2-RBX1 E3 ligase axis targets tumor suppressor RhoB for degradation in liver cancer. Mol Cell Proteomics 14:499-509 (2015).
Sequence Similarity
Belongs to the ubiquitin-activating E1 family. UBA3 subfamily.
ICC staining UBE1C in A431 cells (green). The nuclear counter stain is DAPI (blue). Cells were fixed in paraformaldehyde, permeabilised with 0.25% Triton X100/PBS.
ICC staining UBE1C in HUVEC cells (green). The nuclear counter stain is DAPI (blue). Cells were fixed in paraformaldehyde, permeabilised with 0.25% Triton X100/PBS.
ICC staining UBE1C in SH-SY5Y cells (green). The nuclear counter stain is DAPI (blue). Cells were fixed in paraformaldehyde, permeabilised with 0.25% Triton X100/PBS.
Immunohistochemical analysis of paraffin-embedded rat brain tissue using anti-UBE1C antibody. Counter stained with hematoxylin.
Immunohistochemical analysis of paraffin-embedded human pancreas tissue using anti-UBE1C antibody. Counter stained with hematoxylin.
Immunohistochemical analysis of paraffin-embedded mouse testis tissue using anti-UBE1C antibody. Counter stained with hematoxylin.
Western blot analysis of UBE1C on different lysates with Rabbit anti-UBE1C antibody (R1706-14) at 1/1,000 dilution.
Lane 1: Hep G2 (Human hepatocellular carcinoma cell) cell lysate
Exposure time: 3 minutes; ECL: K1802
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: R1706-14, 1/,000 in 5% NFDM/TBST, 2 hour at room temperature Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 52 kDa Observed band size: 52 kDa
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