A human monoclonal antibody specific for the V3 loop of HIV type 1 clade E cross-reacts with other HIV type 1 clades.

Important note: Information in this article was accurate in 1998. The state of the art may have changed since the publication date.

A human monoclonal antibody specific for the V3 loop of HIV type 1 clade E cross-reacts with other HIV type 1 clades.

AIDS Res Hum Retroviruses. 1998 Feb 10;14(3):213-21. Unique Identifier : AIDSLINE MED/98150875
Gorny MK; Mascola JR; Israel ZR; VanCott TC; Williams C; Balfe P; Hioe C; Brodine S; Burda S; Zolla-Pazner S; New York University Medical Center, New York 10016, USA.

Abstract: To ascertain the antigenic relationship between HIV-1 viruses belonging to various genetically defined subgroups (clades), shared epitopes need to be defined. Human monoclonal antibodies MAbs) are particularly useful for this purpose because they can detect complex regions of viral proteins that may be missed by sequence analysis and because, by definition, they react with epitopes that stimulate the human immune system. Monoclonal antibodies derived from the cells of HIV-1 clade B-infected subjects have been used extensively for this purpose. Here we describe the first human MAb derived from a clade E-infected individual; the MAb is specific for the V3 loop, recognizing a core epitope represented by the amino acids TRTSVR on the N-terminal side of the crown of the V3 loop. The IgG1(kappa) MAb, designated 1324E, binds to the clade E consensus V3 loop, to rgp120 proteins from clade E and to peripheral blood mononuclear cells infected in vitro with the virus that infected the subject from whose cells the MAb-producing heterohybridoma was derived. Strong cross-reactivity of the MAb to the V3 peptides, rgp120 proteins, and native monomeric gp120s representing clades A and C, as well as to cells infected with a clade C primary isolate, revealed a shared V3 epitope between these clades. When tested for its neutralizing ability, MAb 1324E neutralized a clade E isolate that had been adapted for growth in H9 cells but failed to neutralize five clade E primary isolates.

Keywords: *Antibodies, Monoclonal/IMMUNOLOGY *HIV Antibodies/IMMUNOLOGY *HIV Envelope Protein gp120/IMMUNOLOGY *HIV-1/IMMUNOLOGY *Peptide Fragments/IMMUNOLOGY
980630
M9861852

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