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Vaccinia complement control protein: multi-functional protein and a potential wonder drug
Purushottam Jha1, Girish J Kotwal
1Department of Microbiology and Immunology, University of Louisville, School of Medicine, Louisville, KY 40202, USA.
Journal of Biosciences
|May 8, 2003
Summary
Vaccinia virus complement protein (VCP) blocks host defense by inhibiting complement activation. Its unique structure and dual binding capabilities offer potential therapeutic applications for inflammatory diseases.
Area of Science:
- Virology
- Immunology
- Structural Biology
Background:
- Vaccinia virus complement control protein (VCP) is an early identified viral molecule crucial for evading host defenses.
- VCP shares structural similarities with human complement control proteins like C4b-BP and functionally resembles CR1.
- It is the only known intact complement control protein with a determined crystal structure.
Purpose of the Study:
- To elucidate the structure and function of Vaccinia virus complement control protein (VCP).
- To explore the dual binding capabilities of VCP and its implications.
- To assess the potential therapeutic applications of VCP in inflammatory diseases.
Main Methods:
- Structural determination via X-ray crystallography.
- Functional assays to assess complement inhibition.
- Binding studies for complement and heparin interactions.
Main Results:
- VCP effectively blocks both major pathways of complement activation.
- VCP exhibits simultaneous binding to complement and heparin.
- The crystal structure reveals VCP as a complete complement control protein.
Conclusions:
- VCP's dual binding ability is key to its function in immune evasion.
- VCP holds significant potential as a therapeutic agent for inflammatory conditions such as Alzheimer's disease, CNS injury, and xenotransplantation.