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Modulation of the NF-kappa B pathway by virally encoded death effector domains-containing proteins
P M Chaudhary1, A Jasmin, M T Eby
1Hamon Center for Therapeutic Oncology Research, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas, TX 75235-8593, USA.
Abstract:
Death Effector Domains (DEDs) have been known to mediate the recruitment of Caspase 8 and its homologs to the aggregated death-inducing signaling complex (DISC), consisting of the death domain (DD)-containing receptors and various signaling proteins. In addition, several viruses were recently shown to encode proteins with DEDs (also called FLICE inhibitory proteins or vFLIPs) which have the ability of blocking cell death induced by DD-containing receptors. We provide evidence that vFLIPs can also modulate the NF-kappaB pathway and physically interact with several signaling proteins, such as the TRAFs, RIP, NIK and the IKKs. Modulation of the NF-kappaB pathway may play a role in the natural history of infection by these viruses.
Insights
Viral FLIPs (vFLIPs) proteins, containing Death Effector Domains (DEDs), not only block cell death but also modulate the NF-kappaB pathway by interacting with key signaling proteins. This interaction may influence viral infection progression.
Area of Science:
- Molecular Biology
- Virology
- Immunology
Background:
- Death Effector Domains (DEDs) mediate Caspase 8 recruitment to the death-inducing signaling complex (DISC).
- Viral proteins with DEDs, known as viral FLICE inhibitory proteins (vFLIPs), can inhibit receptor-mediated cell death.
Purpose of the Study:
- To investigate the broader functional role of vFLIPs beyond cell death inhibition.
- To explore the interaction of vFLIPs with signaling proteins involved in the NF-kappaB pathway.
Main Methods:
- Experimental investigation of vFLIPs' interaction with signaling molecules.
- Analysis of vFLIPs' impact on the NF-kappaB pathway.
Main Results:
- vFLIPs physically interact with TRAFs, RIP, NIK, and IKKs.
- vFLIPs demonstrate the ability to modulate the NF-kappaB signaling pathway.
Conclusions:
- Viral proteins containing DEDs (vFLIPs) possess functions beyond blocking apoptosis.
- vFLIPs' modulation of the NF-kappaB pathway may be significant in the pathogenesis of viral infections.