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M9640657.TXT
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1996-03-04
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Document 0657
DOCN M9640657
TI Human monoclonal antibody 2G12 defines a distinctive neutralization
epitope on the gp120 glycoprotein of human immunodeficiency virus type
1.
DT 9604
AU Trkola A; Purtscher M; Muster T; Ballaun C; Buchacher A; Sullivan N;
Srinivasan K; Sodroski J; Moore JP; Katinger H; Aaron Diamond AIDS
Research Center, New York University School of; Medicine, New York
10016, USA.
SO J Virol. 1996 Feb;70(2):1100-8. Unique Identifier : AIDSLINE
MED/96135224
AB We have isolated and characterized human monoclonal antibody 2G12 to the
gp120 surface glycoprotein of human immunodeficiency virus type 1
(HIV-1). This antibody potently and broadly neutralizes primary and
T-cell line-adapted clade B strains of HIV-1 in a peripheral blood
mononuclear cell-based assay and inhibits syncytium formation in the
AA-2 cell line. Furthermore, 2G12 possesses neutralizing activity
against strains from clade A but not from clade E. Complement- and
antibody-dependent cellular cytotoxicity-activating functions of 2G12
were also defined. The gp120 epitope recognized by 2G12 was found to be
distinctive; binding of 2G12 to LAI recombinant gp120 was abolished by
amino acid substitutions removing N-linked carbohydrates in the C2, C3,
V4, and C4 regions of gp120. This gp120 mutant recognition pattern has
not previously been observed, indicating that the 2G12 epitope is
unusual. consistent with this, antibodies able to block 2G12 binding to
recombinant gp120 were not detected in significant quantities in 16
HIV-positive human serum samples.
DE Amino Acid Sequence Antibodies, Monoclonal/*IMMUNOLOGY
Antibody-Dependent Cell Cytotoxicity/IMMUNOLOGY Cell Line Complement
3/IMMUNOLOGY *Epitope Mapping Giant Cells/IMMUNOLOGY/VIROLOGY
Glycosylation Human HIV Antibodies/*IMMUNOLOGY HIV Envelope Protein
gp120/*IMMUNOLOGY HIV-1/*IMMUNOLOGY/ISOLATION & PURIF Molecular
Sequence Data Mutation Neutralization Tests
Polysaccharides/IMMUNOLOGY Support, Non-U.S. Gov't Support, U.S.
Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).