Specific interaction of HIV-1 and HIV-2 surface envelope glycoproteins with monolayers of galactosylceramide and ganglioside GM3.

The Journal of Biological Chemistry
D HammacheJacques Fantini

Abstract

Cellular glycosphingolipids mediate the fusion between some viruses and the plasma membrane of target cells. In the present study, we have analyzed the interaction of human immunodeficiency virus (HIV)-1 and HIV-2 surface envelope glycoproteins from distinct viral isolates with monolayers of various glycosphingolipids at the air-water interface. The penetration of the viral glycoproteins into glycosphingolipid monolayers was detected as an increase in the surface pressure. We found that HIV-1 recombinant gp120 (IIIB isolate) could penetrate into a monomolecular film of alpha-hydroxylated galactosylceramide (GalCer-HFA), while ceramides, GluCer, and nonhydroxylated GalCer were totally inactive. The glycoproteins isolated from HIV-1 isolates LAI and NDK and from HIV-2(ROD) could also interact with a GalCer-HFA monolayer, whereas gp120 from HIV-1(SEN) and HIV-1(89.6) did not react. These data correlated with the ability of the corresponding viruses to gain entry into the CD4(-)/GalCer+ cell line HT-29, demonstrating the determinant role of GalCer-HFA in this CD4-independent pathway of HIV-1 and HIV-2 infection. In contrast, all HIV-1 and HIV-2 glycoproteins tested were found to interact with a monolayer of GM3, a ganglioside abund...Continue Reading

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