HLA-DR peptide inhibits HIV-induced syncytia.
The infectivity of the human immunodeficiency virus (HIV) is related to the structure of its envelope protein, gp160, which is responsible for viral entry. We considered the possibility that a structural homology between gp160 and major histocompatibility complex (MHC) molecules might be associated with the extraordinary affinity that gp120 has for its receptor, CD4. Amino acid sequence comparisons revealed five regions of structural similarity between the HLA-DR beta molecule and gp160. The DR2 beta synthetic peptides containing these regions were examined for their ability to block HIV-induced syncytia formation using a 51Cr release assay. The peptide beta 141-155 inhibited the formation of syncytia whereas the other four DR beta peptides with gp160 similarity did not. Our results indicate that this region in gp120, which is similar to an HLA-DR region, is crucial to T cell-gp120 interactions, and should be considered in the design of future vaccines.
Howard Hughes Medical Institute Baylor College of Medicine, Houston, TX 77030.
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Lewis
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Ulrich
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Atassi
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Atassi
D000595:Amino Acid Sequence; D001665:Binding Sites; D015704:CD4 Antigens / Q000378:metabolism*; D002459:Cell Fusion; D002460:Cell Line; D003588:Cytopathogenic Effect, Viral; D015686:Gene Products, env / Q000378:metabolism*; D006678:HIV / Q000378:metabolism*; D015699:HIV Envelope Protein gp120 / Q000378:metabolism* / Q000648:ultrastructure; D019302:HIV Envelope Protein gp160; D006684:HLA-DR Antigens; D006801:Humans; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000138:chemical synthesis / Q000494:pharmacology*; D011485:Protein Binding; D011487:Protein Conformation; D011498:Protein Precursors / Q000378:metabolism*
D015704:CD4 Antigens; D015686:Gene Products, env; D015699:HIV Envelope Protein gp120; D019302:HIV Envelope Protein gp160; D006684:HLA-DR Antigens; D010446:Peptide Fragments; D011498:Protein Precursors