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Anti-idiotype isolation of a broad and potent influenza A virus-neutralizing human antibody

Journal Article · · Frontiers in Immunology
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  1. National Institutes of Health (NIH), Bethesda, MD (United States)
  2. National Institutes of Health (NIH), Bethesda, MD (United States); US Food and Drug Administration (USFDA), Silver Spring, MD (United States)
  3. Columbia Univ., New York, NY (United States)
  4. National Institutes of Health (NIH), Bethesda, MD (United States); Columbia Univ., New York, NY (United States)
The VH6-1 class of antibodies includes some of the broadest and most potent antibodies that neutralize influenza A virus. Here, we elicit and isolate anti-idiotype antibodies against germline versions of VH6-1 antibodies, use these to sort human leukocytes, and isolate a new VH6-1-class member, antibody L5A7, which potently neutralized diverse group 1 and group 2 influenza A strains. While its heavy chain derived from the canonical IGHV6-1 heavy chain gene used by the class, L5A7 utilized a light chain gene, IGKV1-9, which had not been previously observed in other VH6-1-class antibodies. The cryo-EM structure of L5A7 in complex with Indonesia 2005 hemagglutinin revealed a nearly identical binding mode to other VH6-1-class members. The structure of L5A7 bound to the isolating anti-idiotype antibody, 28H6E11, revealed a shared surface for binding anti-idiotype and hemagglutinin that included two critical L5A7 regions: an FG motif in the third heavy chain-complementary determining region (CDR H3) and the CDR L1 loop. Surprisingly, the chemistries of L5A7 interactions with hemagglutinin and with anti-idiotype were substantially different. Overall, we demonstrate anti-idiotype-based isolation of a broad and potent influenza A virus-neutralizing antibody, revealing that anti-idiotypic selection of antibodies can involve features other than chemical mimicry of the target antigen.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); Simons Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; W-31109-ENG-38
OSTI ID:
2470055
Journal Information:
Frontiers in Immunology, Journal Name: Frontiers in Immunology Vol. 15; ISSN 1664-3224
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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