Interaction between the cytoplasmic domain of ICAM-1 and Pr55Gag leads to acquisition of host ICAM-1 by human immunodeficiency virus type 1.
We have examined the molecular basis for the selective incorporation of the adhesion molecule ICAM-1 within human immunodeficiency virus type 1 (HIV-1). The process of ICAM-1 incorporation was investigated by using different ICAM-1 constructs in combination with virus capture and immunoprecipitation studies, Western blot and confocal microscopy analyses, and infectivity assays. Experiments conducted with viruses bearing a truncated version of ICAM-1 revealed that the cytoplasmic domain of ICAM-1 governs insertion of this adhesion molecule into HIV-1. Further experiments suggested that there is an association between ICAM-1 and the virus-encoded Pr55(Gag) polyprotein. This study represents the first demonstration that structural Gag polyproteins play a key role in the uptake of a host-derived cell surface by the virus entity. Taken together, our results indicate that interactions between viral and cellular proteins are responsible for the selective uptake of host ICAM-1 by HIV-1. This observation describes a new strategy by which HIV-1 can modulate its replicative cycle, considering that insertion of ICAM-1 within nascent virions has been shown to increase virus infectivity.
Research Center in Infectious Diseases, RC709, CHUL Research Center, Faculty of Medicine, Laval University, Quebec, Canada.
Yannick
Y
Beauséjour
Michel J
MJ
Tremblay
D001665:Binding Sites; D002460:Cell Line; D003593:Cytoplasm / Q000737:chemistry; D015683:Gene Products, gag / Q000378:metabolism*; D015497:HIV-1 / Q000502:physiology*; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism*; D011498:Protein Precursors / Q000378:metabolism*
D015683:Gene Products, gag; D011498:Protein Precursors; C059767:p55 gag precursor protein, Human immunodeficiency virus 1; D018799:Intercellular Adhesion Molecule-1