TNF receptor-associated factor 1 is a protein that in humans is encoded by the TRAF1 gene. The protein encoded by this gene is a member of the TNF receptor (TNFR) associated factor (TRAF) protein family. TRAF proteins associate with, and mediate the signal transduction from various receptors of the TNFR superfamily. This protein and TRAF2 form a heterodimeric complex, which is required for TNF-alpha-mediated activation of MAPK8/JNK and NF-kappaB. The protein complex formed by this protein and TRAF2 also interacts with IAP, and thus mediates the anti-apoptotic signals from TNF receptors. The expression of this protein can be induced by Epstein-Barr virus (EBV). EBV infection membrane protein 1 (LMP1) is found to interact with this and other TRAF proteins; this interaction is thought to link LMP1-mediated B lymphocyte transformation to the signal transduction from TNFR family receptors. TRAF1 also functions as a negative regulator of inflammation by interfering with the linear ubiquitination of NEMO downstream of TLR signaling. This explains why TRAF1 polymorphisms cause an increased risk for rheumatic diseases.
Background References
1. Jang H et al. TRAF1 from a Structural Perspective. Biomolecules. 2024 Apr
2. Chen Y et al. N(6)-methyladenosine-modified TRAF1 promotes sunitinib resistance by regulating apoptosis and angiogenesis in a METTL14-dependent manner in renal cell carcinoma. Mol Cancer. 2022 May
Western blot analysis of TRAF1 on different lysates with Rabbit anti-TRAF1 antibody (HA723581) at 1/10,000 dilution.
Lane 1: Raji cell lysate (20 µg/Lane) Lane 2: HEK-293 cell lysate (negative) (20 µg/Lane) Lane 3: Ramos cell lysate (20 µg/Lane) Lane 4: Daudi cell lysate (20 µg/Lane) Lane 5: Rat spleen tissue lysate (40 µg/Lane)
Predicted band size: 46 kDa Observed band size: 50 kDa
Exposure time: 6 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA723581) at 1/10,000 dilution was used in primary antibody dilution (K1803) at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
TRAF1 was immunoprecipitated from 0.2 mg Raji cell lysate with HA723581 at 2 µg/10 µl beads. Western blot was performed from the immunoprecipitate using HA723581 at 1/5,000 dilution. HRP Conjugated Anti-Rabbit IgG for IP Nano-secondary antibody at 1/5,000 dilution was used for 1 hour at room temperature.
Lane 1: Raji cell lysate (input) Lane 2: HA723581 IP in Raji cell lysate Lane 3: Rabbit IgG instead of HA723581 in Raji cell lysate