Endogenous association of TRAF2, TRAF3, cIAP1, and Smac with lymphotoxin beta receptor reveals a novel mechanism of apoptosis.
Lymphotoxin-beta receptor (LT beta R) is a member of tumor necrosis factor receptor family and plays essential roles in the embryonic development and organization of secondary lymphoid tissues. It binds two types of tumor necrosis factor family cytokines, heterotrimer LT alpha 1 beta 2 and homotrimer LIGHT, and activates multiple signaling pathways including transcriptional factor NF kappa B, c-Jun N-terminal kinase, and cell death. However, the molecular mechanism of the activation of these signaling pathways by LT beta R is not clear. Because there is no enzymatic activity associated with the receptor itself, the signal transduction of LT beta R is mediated by cytoplasmic proteins recruited to receptors. To identify these proteins, we took a proteomic approach. The endogenous LIGHT.LT beta R complex was affinity-purified from U937 cells, and proteins associated with the complex were identified by mass spectrometry. Four of five proteins identified, TRAF2, TRAF3, cIAP1, and Smac, are reported here. Their association with LT beta R was further confirmed by coimmunoprecipitation in U937 cells and HEK293 cells. The presence of cIAP1 and Smac in LIGHT.LT beta R complex revealed a novel mechanism of LIGHT.LT beta R-induced apoptosis.
Pubmed ID: 12571250 RIS Download
Apoptosis | Blotting, Western | Carrier Proteins | Cell Line | Dimerization | Electrophoresis, Polyacrylamide Gel | Humans | Inhibitor of Apoptosis Proteins | Intracellular Signaling Peptides and Proteins | Lymphotoxin beta Receptor | Mass Spectrometry | Membrane Proteins | Mitochondrial Proteins | Models, Biological | NF-kappa B | Plasmids | Precipitin Tests | Protein Binding | Proteins | Receptors, Tumor Necrosis Factor | Signal Transduction | TNF Receptor-Associated Factor 2 | TNF Receptor-Associated Factor 3 | Time Factors | Tumor Cells, Cultured | Tumor Necrosis Factor Ligand Superfamily Member 14 | Tumor Necrosis Factor-alpha | U937 Cells | Ubiquitin-Protein Ligases