Initial Step of Virus Entry: Virion Binding to Cell-Surface Glycans

Area of Science:

• Virology
• Glycobiology
• Cell Biology

Background:

• Viral entry into host cells is a complex process involving viral proteins and host cell components.
• Cell-surface glycans play crucial roles in viral infections, acting as attachment factors or direct entry receptors.

Purpose of the Study:

• To provide a comprehensive overview of the role of glycans in viral infection.
• To highlight experimental approaches for studying virus-glycan binding.
• To emphasize advancements in single-virion level analysis of these interactions.

Main Methods:

• Identification of specific glycan receptors using various techniques.
• Determination of atomic-level structures of virus-glycan complexes.
• Single-virion level studies, including atomic force microscopy on living mammalian cells.

Main Results:

• Glycans facilitate initial virus attachment and subsequent high-affinity binding to specific receptors.
• Certain glycans function directly as virus entry receptors.
• Advanced techniques enable detailed structural and dynamic analysis of virus-glycan interactions.

Conclusions:

• Glycans are critical determinants of viral tropism and entry mechanisms.
• Single-virion studies on living cells offer unprecedented insights into virus-glycan interactions under physiological conditions.
• Understanding these interactions is key to developing antiviral strategies.