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The C domain of HIV-1 gp41 binds the putative cellular receptor protein P62.


AIDS. 1999 Jun 18;13(9):1021-4. Unique Identifier : AIDSLINE

OBJECTIVE: To characterize the binding of gp41 with the putative receptor protein P62. DESIGN: HIV-1 gp41 binds several cellular proteins by two binding sites, one of which has been shown to bind to a putative receptor protein P45 (45 kDa). Based on this, an attempt was made to determine the relationship between the two binding sites and P62 (62 kDa). METHODS: Using surface plasmon resonance (SPR) measurement, the interaction was measured between recombinant soluble gp41 (rsgp41, Env aa539-684) and protein P62. Inhibition of this interaction was attempted by the use of synthetic peptides (P1, aa583-599; P2, aa646-674) corresponding to the two binding sites in gp41. In addition, the direct binding of P62 to peptide P2 was examined in an enzyme-linked immunosorbent assay. RESULTS: Using SPR measurement, the interaction between P62 and rsgp41 was confirmed, and the interaction was found to be inhibited by only the synthetic peptide P2 sequence that corresponds to the C domain of gp41; neither P1 nor a control peptide inhibited the interaction. Moreover, like rsgp41, P2 was able to bind P62 whereas P1 and another recombinant gp41 (aa567-648 that does not include the C domain) were not. CONCLUSIONS: P62 bound rsgp41 and the synthetic peptide P2. This interaction could be inhibited only by P2. These results indicate that the C domain of HIV-1 gp41 binds P62.

JOURNAL ARTICLE Animal Binding Sites Enzyme-Linked Immunosorbent Assay HIV Antibodies/IMMUNOLOGY/METABOLISM HIV Envelope Protein gp41/*METABOLISM HIV-1/*METABOLISM Membrane Proteins/METABOLISM Mice Molecular Sequence Data Peptides/CHEMISTRY/CHEMICAL SYNTHESIS/METABOLISM Protein Binding Rabbits Receptors, HIV/*METABOLISM Recombinant Proteins/METABOLISM RNA-Binding Proteins/*METABOLISM Support, Non-U.S. Gov't Surface Plasmon Resonance


Information in this article was accurate in November 30, 1999. The state of the art may have changed since the publication date. This material is designed to support, not replace, the relationship that exists between you and your doctor. Always discuss treatment options with a doctor who specializes in treating HIV.