Selective effects of electrostatic changes in the CD4 CDR-3-like loop on infection by different human immunodeficiency virus type 1 isolates.

Important note: Information in this article was accurate in 1997. The state of the art may have changed since the publication date.

Selective effects of electrostatic changes in the CD4 CDR-3-like loop on infection by different human immunodeficiency virus type 1 isolates.

AIDS Res Hum Retroviruses. 1996 Jul 20;12(11):1001-13. Unique Identifier : AIDSLINE MED/96424755
Signoret N; Blanc-Zouaoui D; Kwong PD; Sattentau QJ; Centre d'Immunologie de Marseille-Luminy, France.

Abstract: The role of the CDR-3-like loop of the first domain of the CD4 molecule in infection by the human immunodeficiency virus type 1 (HIV-1) is controversial. In an attempt to determine whether the strong negative charge in the CDR-3-like loop influences HIV-1 infection we have substituted by mutagenesis negative for positively charged residues at position 87/88 and 91/92. These mutations were shown to have no obvious effect on CD4 conformation outside of the CDR-3-like loop. Infection of cells expressing the E87K/D88K substitution mutant resulted in a selective reduction in infectivity for certain HIV-1 viruses compared to cells expressing wile-type CD4. Viruses Hx10, HxB2, and MN were 4- to 13-fold less efficient at infecting the E87K/D88K mutant, whereas SF2, RF, and NDK yielded an efficiency of infection similar to, or slightly greater than, that of the wild type. To investigate the step at which infectivity was selectively reduced, we compared early events in the life cycles of Hx10 and SF2 viruses using PCR entry and gp120-binding assays. Both gp120 binding and virus entry were reduced for Hx10 on the mutant CD4-expressing cells as compared to wild-type CD4-expressing cells, whereas no difference was seen in either assay with SF2. Although relatively small in magnitude, the contribution of the CDR-3-like loop to the overall CD4-gp120 interaction may serve to modify the binding and entry of certain virus isolates.

Keywords: Antigens, CD4/*CHEMISTRY/GENETICS Cell Line Electrostatics Human HIV Envelope Protein gp120/METABOLISM HIV-1/*PATHOGENICITY Models, Molecular Mutagenesis, Site-Directed Polymerase Chain Reaction Protein Conformation RNA-Directed DNA Polymerase/METABOLISM Structure-Activity Relationship Support, Non-U.S. Gov't JOURNAL ARTICLE
970330
M9731497

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