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© Research
Publication : Science (New York, N.Y.)

Structural basis of synergistic neutralization of Crimean-Congo hemorrhagic fever virus by human antibodies.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Science (New York, N.Y.) - 07 Jan 2022

Mishra AK, Hellert J, Freitas N, Guardado-Calvo P, Haouz A, Fels JM, Maurer DP, Abelson DM, Bornholdt ZA, Walker LM, Chandran K, Cosset FL, McLellan JS, Rey FA,

Link to Pubmed [PMID] – 34793197

Link to DOI – 10.1126/science.abl6502

Science 2022 Jan; 375(6576): 104-109

Crimean-Congo hemorrhagic fever virus (CCHFV) is the most widespread tick-borne zoonotic virus, with a 30% case fatality rate in humans. Structural information is lacking in regard to the CCHFV membrane fusion glycoprotein Gc—the main target of the host neutralizing antibody response—as well as antibody–mediated neutralization mechanisms. We describe the structure of prefusion Gc bound to the antigen-binding fragments (Fabs) of two neutralizing antibodies that display synergy when combined, as well as the structure of trimeric, postfusion Gc. The structures show the two Fabs acting in concert to block membrane fusion, with one targeting the fusion loops and the other blocking Gc trimer formation. The structures also revealed the neutralization mechanism of previously reported antibodies against CCHFV, providing the molecular underpinnings essential for developing CCHFV–specific medical countermeasures for epidemic preparedness.

https://pubmed.ncbi.nlm.nih.gov/34793197