Human monoclonal antibody that recognizes the V3 region of human immunodeficiency virus gp120 and neutralizes the human T-lymphotropic virus type IIIMN strain.
We describe a human IgG1 monoclonal antibody (N701.9b) derived by Epstein-Barr virus transformation of B cells from a human immunodeficiency virus-seropositive asymptomatic donor. This antibody was shown to recognize the principal neutralizing domain contained within the V3 region of gp120 of the MN strain of human immunodeficiency virus and MN-like strains, as determined by binding to the PB-1 fragment of MN gp120 and to synthetic peptides corresponding to the V3 region of MN and related virus strains. The epitope identified by monoclonal antibody N701.9b was mapped to a segment of V3 containing at least 7 amino acids (amino acids 316-322), which is located in the "tip" and "right" side of the V3 loop of the MN strain. Furthermore, this antibody manifested potent type-specific fusion-inhibitory activity against the MN strain but not against the IIIB or RF virus strains. This antibody also neutralized four virus isolates that had MN-like V3 region sequences and failed to neutralize three other strains containing unrelated V3 region sequences. Our findings confirm that the V3 region stimulates type-specific neutralizing antibody during natural human immunodeficiency virus infection in humans. The potential clinical use of this antibody is discussed.
Repligen Corporation, Cambridge, MA 02139.
C F
CF
Scott
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S
Silver
A T
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Profy
S D
SD
Putney
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A
Langlois
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K
Weinhold
J E
JE
Robinson
D000595:Amino Acid Sequence; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000920:Antibody-Dependent Cell Cytotoxicity; D001402:B-Lymphocytes / Q000276:immunology; D000939:Epitopes / Q000032:analysis* / Q000276:immunology; D006678:HIV / Q000235:genetics / Q000276:immunology*; D015699:HIV Envelope Protein gp120 / Q000235:genetics / Q000276:immunology*; D015497:HIV-1 / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D008969:Molecular Sequence Data; D009500:Neutralization Tests; D013045:Species Specificity; D014616:Vaccinia virus / Q000235:genetics
D000911:Antibodies, Monoclonal; D000939:Epitopes; D015699:HIV Envelope Protein gp120