Fusing structure and function: a structural view of the herpesvirus entry machinery

Area of Science:

• Virology
• Structural Biology
• Molecular Biology

Background:

• Herpesviruses are complex enveloped viruses with double-stranded DNA.
• Viral entry involves fusion with host cell membranes, requiring multiple viral glycoproteins and host receptors.
• Herpes simplex virus (HSV) and Epstein-Barr virus (EBV) are prototypic herpesviruses with well-studied entry mechanisms.

Purpose of the Study:

• To elucidate the structural basis of herpesvirus entry into host cells.
• To understand the roles of viral glycoproteins and host receptors in HSV and EBV infection.
• To identify the viral fusogen responsible for mediating membrane fusion.

Main Methods:

• X-ray crystallography and cryo-electron microscopy were used to determine the structures of viral glycoproteins and host receptors.
• Structure-function relationship studies were performed to analyze viral binding and fusion.
• Bioinformatic analyses were employed to identify conserved regions and potential interaction sites.

Main Results:

• The structures of major HSV and EBV glycoproteins and key host receptors have been determined.
• Structural data revealed conformational changes upon virus-receptor binding, crucial for fusion.
• Potential sites for protein-protein and protein-lipid interactions were identified, along with the likely viral fusogen.

Conclusions:

• Structural insights have significantly advanced the understanding of HSV and EBV binding and fusion processes.
• Knowledge of viral glycoprotein structures and their interactions with host receptors is critical for understanding herpesvirus entry.
• These findings pave the way for developing novel antiviral strategies targeting viral fusion.