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- Document 0523
- DOCN M9620523
- TI Mapping the Ig superantigen-binding site of HIV-1 gp120.
- DT 9602
- AU Goodglick L; Zevit N; Neshat MS; Braun J; Department of Pathology and
- Laboratory Medicine, Jonsson; Comprehensive Cancer Center, UCLA School
- of Medicine 90095, USA.
- SO J Immunol. 1995 Dec 1;155(11):5151-9. Unique Identifier : AIDSLINE
- MED/96072787
- AB The envelope glycoprotein, gp120, of HIV-1 has recently been identified
- as a member of the new family of Ig superantigens (Ig-SAg). This
- classification is based on the selective binding of gp120 to an
- unusually high proportion of endogenous, nonimmune Ig, and the selective
- activation of nonimmune B cells by gp120 in vitro. Many, if not all of
- the nonimmune Ig that bind to gp120 are members of the VH3 Ig gene
- family. The aim of this study was to determine the epitope on gp120 that
- was responsible for its Ig-SAg binding activity. To do this, we utilized
- a panel of 30 peptides derived from gp160 in a competition-binding
- assay. For five Igs that were tested, as well as for polyclonal serum
- IgM, two overlapping peptides (each 20 amino acids in length) were
- identified that were potent inhibitors of gp120 binding. Similarly, the
- 10 amino acid overlap region of these two peptides had inhibitory
- activity. Thus, this decamer sequence represented the optimal Ig-SAg
- epitope or mimotope. The amino acid residue at position 1 of the
- decamer, and to a lesser extent at position 10, was critical for peptide
- binding. In addition to this decamer peptide, other peptides that shared
- modest sequence homology were also selectively inhibitory for specific
- Ig samples. These findings provide the first definition of an Ig-SAg
- ligand at the peptide level and will facilitate further structural and
- biologic characterization of this new class of pathogenic Ags.
- DE Amino Acid Sequence Antibodies, Monoclonal/IMMUNOLOGY *Epitope Mapping
- Human HIV Envelope Protein gp120/*METABOLISM HIV-1/*IMMUNOLOGY
- IgM/IMMUNOLOGY/METABOLISM Molecular Sequence Data Peptides/IMMUNOLOGY
- Superantigens/*METABOLISM 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).
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-