A single residue in the Gc protein dictates neutralization sensitivity and virulence in SFTSV.

A single amino acid residue, Arg577 in Gc protein, determines SFTSV's neutralization sensitivity and virulence, impacting viral fitness and pathogenicity.

• Why it matters: Understanding the molecular basis of SFTSV's immune evasion and virulence is crucial for developing effective vaccines and therapies against this high-fatality pathogen.
• What they did: Researchers isolated Gc-specific monoclonal antibodies and used mutational analysis and reverse genetics to identify Arg577 as key for antibody binding, viral replication, and virulence, with experiments on different strains.
• The result: Mutating Arg577 altered neutralization susceptibility and viral fitness, revealing its central role in pathogenicity, and guiding the design of broad-spectrum antibody therapies.