Direct binding of Fas-associated death domain (FADD) to the tumor necrosis factor-related apoptosis-inducing ligand receptor DR5 is regulated by the death effector domain of FADD.
Members of the tumor necrosis factor superfamily of receptors induce apoptosis by recruiting adaptor molecules through death domain interactions. The central adaptor molecule for these receptors is the death domain-containing protein Fas-associated death domain (FADD). FADD binds a death domain on a receptor or additional adaptor and recruits caspases to the activated receptor. Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) signals apoptosis through two receptors, DR4 and DR5. Although there is much interest in TRAIL, the mechanism by which FADD is recruited to the TRAIL receptors is not clear. Using a reverse two-hybrid system we previously identified mutations in the death effector domain of FADD that prevented binding to Fas/CD95. Here we show that these mutations also prevent binding to DR5. FADD-deficient Jurkat cells stably expressing these FADD mutations did not transduce TRAIL or Fas/CD95 signaling. Second site compensating mutations that restore binding to and signaling through Fas/CD95 and DR5 were also in the death effector domain. We conclude that in contrast to current models where the death domain of FADD functions independently of the death effector domain, the death effector domain of FADD comes into direct contact with both TRAIL and Fas/CD95 receptors.
Thomas
Lance R
LR
Department of Cancer Biology and Comprehensive Cancer Center, Wake Forest University School of Medicine, Medical Center Blvd. Winston-Salem, North Carolina 27157, USA.
Henson
Adrianna
A
Reed
John C
JC
Salsbury
Freddie R
FR
Thorburn
Andrew
A
D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D017209:Apoptosis; D002352:Carrier Proteins / Q000737:chemistry* / Q000378:metabolism; D020169:Caspases / Q000378:metabolism; D002460:Cell Line; D003001:Cloning, Molecular; D056970:Co-Repressor Proteins; D004789:Enzyme Activation; D049452:Green Fluorescent Proteins; D006367:HeLa Cells; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D019169:Jurkat Cells; D008024:Ligands; D008164:Luminescent Proteins / Q000378:metabolism; D051379:Mice; D008958:Models, Molecular; D018832:Molecular Chaperones; D009154:Mutation; D009687:Nuclear Proteins / Q000737:chemistry* / Q000378:metabolism; D010957:Plasmids / Q000378:metabolism; D011233:Precipitin Tests; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000737:chemistry / Q000378:metabolism*; D015398:Signal Transduction; D013816:Thermodynamics; D020798:Two-Hybrid System Techniques; D014633:Valine / Q000737:chemistry; D019014:fas Receptor / Q000737:chemistry / Q000378:metabolism
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D056970:Co-Repressor Proteins; C106985:DAXX protein, human; C491473:Daxx protein, mouse; D047908:Intracellular Signaling Peptides and Proteins; D008024:Ligands; D008164:Luminescent Proteins; D018832:Molecular Chaperones; D009687:Nuclear Proteins; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; C105190:TNFRSF10A protein, human; C505639:TNFRSF10B protein, human; C505640:Tnfrsf10b protein, mouse; D019014:fas Receptor; D049452:Green Fluorescent Proteins; D020169:Caspases; D014633:Valine