Le HT, Do PC, Le L. Grafting Methionine on 1F1 Ab Increases the Broad-Activity on HA Structural-Conserved Residues of H1, H2, and H3 Influenza a Viruses.
Evol Bioinform Online 2021;
17:11769343211003082. [PMID:
33795930 PMCID:
PMC7975486 DOI:
10.1177/11769343211003082]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 02/24/2021] [Indexed: 11/27/2022] Open
Abstract
A high level of mutation enables the influenza A virus to resist antibiotics
previously effective against the influenza A virus. A portion of the structure
of hemagglutinin HA is assumed to be well-conserved to maintain its role in
cellular fusion, and the structure tends to be more conserved than sequence. We
designed peptide inhibitors to target the conserved residues on the HA surface,
which were identified based on structural alignment. Most of the conserved and
strongly similar residues are located in the receptor-binding and esterase
regions on the HA1 domain In a later step, fragments of anti-HA antibodies were
gathered and screened for the binding ability to the found conserved residues.
As a result, Methionine amino acid got the best docking score within the −2.8 Å
radius of Van der Waals when it is interacting with Tyrosine, Arginine, and
Glutamic acid. Then, the binding affinity and spectrum of the fragments were
enhanced by grafting hotspot amino acid into the fragments to form peptide
inhibitors. Our peptide inhibitor was able to form in silico contact with a
structurally conserved region across H1, H2, and H3 HA, with the binding site at
the boundary between HA1 and HA2 domains, spreading across different monomers,
suggesting a new target for designing broad-spectrum antibody and vaccine. This
research presents an affordable method to design broad-spectrum peptide
inhibitors using fragments of an antibody as a scaffold.
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