Related Experiment Videos
Human cytomegalovirus encodes a highly specific RANTES decoy receptor
Dai Wang1, Wade Bresnahan, Thomas Shenk
1Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA.
Summary
Human cytomegalovirus (CMV) uses the pUL21.5 protein as a decoy receptor. This secreted glycoprotein selectively binds RANTES, blocking its interaction with host cells to modulate the immune response during infection.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Human cytomegalovirus (CMV) is a common pathogen that establishes lifelong infections.
- Viral proteins play crucial roles in evading host immune responses.
- Chemokines are key mediators of immune cell trafficking during infection.
Purpose of the Study:
- To investigate the function of the human cytomegalovirus pUL21.5 protein.
- To determine the interaction of pUL21.5 with host immune mediators.
- To understand the role of pUL21.5 in modulating the host immune response to CMV infection.
Main Methods:
- Expression and purification of the pUL21.5 protein.
- Biochemical assays to assess chemokine binding.
- Functional assays to evaluate the impact of pUL21.5 on chemokine receptor interaction.
Main Results:
- The pUL21.5 protein is a secreted glycoprotein.
- pUL21.5 functions as a soluble CC chemokine receptor decoy.
- pUL21.5 selectively binds RANTES (regulated upon activation, normal T cell expressed and secreted) with high affinity.
- Binding of RANTES by pUL21.5 inhibits its interaction with cellular receptors.
Conclusions:
- Human cytomegalovirus encodes the pUL21.5 protein to interfere with the host immune system.
- pUL21.5 acts as a viral decoy receptor, specifically targeting RANTES.
- This mechanism allows CMV to modulate the host antiviral response early in infection, even before viral gene expression.