Structurally Distinct Recognition Motifs in Lymphotoxin-β Receptor and CD40 for Tumor Necrosis Factor Receptor-associated Factor (TRAF)-mediated Signaling

Lymphotoxin-β receptor (LTβR) and CD40 are members of the tumor necrosis factor family of signaling receptors that regulate cell survival or death through activation of NF-κB. These receptors transmit signals through downstream adaptor proteins called tumor necrosis factor receptor-associated factor...

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Bibliographic Details
Published in:The Journal of biological chemistry 2003-12, Vol.278 (50), p.50523-50529
Main Authors: Li, Chenglong, Norris, Paula S., Ni, Chao-Zhou, Havert, Marnie L., Chiong, Elizabeth M., Tran, Bonnie R., Cabezas, Edelmira, Reed, John C., Satterthwait, Arnold C., Ware, Carl F., Ely, Kathryn R.
Format: Article
Language:English
Subjects:
Adaptor Proteins, Signal Transducing
Amino Acid Motifs
Amino Acid Sequence
CD40 Antigens - biosynthesis
CD40 Antigens - chemistry
Cell Line
Cell Survival
Crystallography, X-Ray
DNA, Complementary - metabolism
Electrons
Glutathione Transferase - metabolism
Humans
Lymphotoxin beta Receptor
Models, Molecular
Molecular Sequence Data
Mutagenesis, Site-Directed
Peptides - chemistry
Protein Binding
Protein Conformation
Protein Structure, Secondary
Protein Structure, Tertiary
Proteins - metabolism
Receptors, Tumor Necrosis Factor - chemistry
Receptors, Tumor Necrosis Factor - metabolism
Recombinant Fusion Proteins - metabolism
Signal Transduction
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Summary:Lymphotoxin-β receptor (LTβR) and CD40 are members of the tumor necrosis factor family of signaling receptors that regulate cell survival or death through activation of NF-κB. These receptors transmit signals through downstream adaptor proteins called tumor necrosis factor receptor-associated factors (TRAFs). In this study, the crystal structure of a region of the cytoplasmic domain of LTβR bound to TRAF3 has revealed an unexpected new recognition motif, 388IPEEGD393, for TRAF3 binding. Although this motif is distinct in sequence and structure from the PVQET motif in CD40 and PIQCT in the regulator TRAF-associated NF-κB activator (TANK), recognition is mediated in the same binding crevice on the surface of TRAF3. The results reveal structurally adaptive “hot spots” in the TRAF3-binding crevice that promote molecular interactions driving specific signaling after contact with LTβR, CD40, or the downstream regulator TANK.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.M309381200