This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Linsley, P S Articles by Hu, S L Search for Related Content PubMed PubMed Citation Articles by Linsley, P S Articles by Hu, S L

 Previous Article  |  Next Article 

J Virol. 1988 October; 62(10): 3695-3702

Effects of anti-gp120 monoclonal antibodies on CD4 receptor binding by the env protein of human immunodeficiency virus type 1.

Oncogen, Seattle, Washington 98121.

ABSTRACT

Monoclonal antibodies (MAbs) to defined peptide epitopes on gp120 from human immunodeficiency virus type 1 were used to investigate the involvement of their epitopes in gp120 binding to the CD4 receptor. Recombinant vaccinia viruses were constructed that expressed either full-length gp120 (v-ED6), or a truncated gp120 lacking 44 amino acids at the carboxyl terminus (v-ED4). Binding of these glycoproteins to the CD4 receptor was detected directly with metabolically labeled gp120 or indirectly with the gp120 MAbs. Truncated gp120 from v-ED4 bound to CD4-positive cells less than 1/12 as well as gp120 from v-ED6, indicating that the C-terminal region of gp120, which is conserved in numerous isolates of human immunodeficiency virus type 1, is critical for CD4 binding. However, MAb 110-1, which recognizes a peptide contained in the region deleted from v-ED4 (amino acids 489 through 511), did not inhibit binding of gp120 to CD4. MAb 110-1 also reacted with gp120 bound to the CD4 receptor, indicating that the epitope for this antibody does not directly interact with CD4. A second MAb, 110-4, which recognizes a peptide epitope located between amino acids 303 and 323 and has potent viral neutralizing activity, also bound to gp120 on the CD4 receptor. Furthermore, pretreatment of gp120 with MAb 110-4 at concentrations approximately 1,000-fold higher than those required for complete virus neutralization inhibited subsequent CD4 binding by only about 65%. Taken together, these data suggest that neutralization mediated by antibody 110-4 does not result from binding of this MAb to the CD4-binding site of gp120.

This article has been cited by other articles:

• Klasse, P. J., Sattentau, Q. J. (2002). Occupancy and mechanism in antibody-mediated neutralization of animal viruses. J. Gen. Virol. 83: 2091-2108 [Abstract] [Full Text]  
• Callebaut, C., Blanco, J., Benkirane, N., Krust, B., Jacotot, E., Guichard, G., Seddiki, N., Svab, J., Dam, E., Muller, S., Briand, J.-P., Hovanessian, A. G. (1998). Identification of V3 Loop-binding Proteins as Potential Receptors Implicated in the Binding of HIV Particles to CD4+ Cells. J. Biol. Chem. 273: 21988-21997 [Abstract] [Full Text]  
• Ugolini, S., Mondor, I., Parren, P. W.H.I., Burton, D. R., Tilley, S. A., Klasse, P. J., Sattentau, Q. J. (1997). Inhibition of Virus Attachment to CD4+ Target Cells Is a Major Mechanism of T Cell Line-adapted HIV-1 Neutralization. J. Exp. Med. 186: 1287-1298 [Abstract] [Full Text]  
• Freed, E. O., Martin, M. A. (1995). The Role of Human Immunodeficiency Virus Type 1 Envelope Glycoproteins in Virus Infection. J. Biol. Chem. 270: 23883-23886 [Full Text]  
• Callebaut, C, Krust, B, Jacotot, E, Hovanessian, A. (1993). T cell activation antigen, CD26, as a cofactor for entry of HIV in CD4+ cells. Science 262: 2045-2050 [Abstract]  
• Agy, M., Frumkin, L., Corey, L, Coombs, R., Wolinsky, S., Koehler, J, Morton, W., Katze, M. (1992). Infection of Macaca nemestrina by human immunodeficiency virus type-1. Science 257: 103-106 [Abstract]  
• Moore, J., McKeating, J., Weiss, R., Sattentau, Q. (1990). Dissociation of gp120 from HIV-1 virions induced by soluble CD4. Science 250: 1139-1142 [Abstract]