The envelope glycoprotein from tick-borne encephalitis virus at 2 A resolution

Area of Science:

• Virology
• Structural Biology
• Molecular Biology

Background:

• Flaviviruses are significant human pathogens.
• The major envelope protein is crucial for viral entry and infectivity.
• Understanding the protein's structure is key to developing antiviral strategies.

Purpose of the Study:

• To determine the crystallographically resolved structure of a soluble fragment of the flavivirus major envelope protein.
• To elucidate the protein's architecture and its implications for viral function.
• To identify potential sites involved in receptor binding and conformational changes.

Main Methods:

• X-ray crystallography to determine the protein structure.
• Analysis of protein architecture and surface features.
• Integration of mutational data and biochemical evidence.

Main Results:

• The protein forms a flat, elongated dimer.
• The dimer orientation is parallel to the viral membrane.
• Key residues for antibody binding are located on the outward-facing surface.
• Clustering of virulence-associated mutations suggests a potential receptor binding site.

Conclusions:

• The determined structure provides a novel view of flavivirus envelope protein organization.
• The findings suggest a model for the low pH-triggered, fusion-activating conformational change.
• The identified surface residues and potential binding sites are targets for future antiviral drug development.