TY - JOUR
T1 - Binding of Human Immunodeficiency Virus Type I (HIV-1) Gp120 to Galactosylceramide (GalCer)
T2 - Relationship to the V3 Loop
AU - Cook, David G.
AU - Fantini, Jacques
AU - Spitalnik, Steven L.
AU - Gonzalez-Scarano, Francisco
PY - 1994/6
Y1 - 1994/6
N2 - The primary receptor for the human immunodeficiency virus (HIV) is the CD4 molecule. However, a large body of evidence has demonstrated that some cells that do not express the CD4 receptor can be infected by HIV-1 and HIV-2, indicating that an alternative mechanism of infection must exist for some cell types, Recently it was reported that antibodies against the glycosphingolipid. galactosylceramide (Galβ1-1′Cer;GalCer), blocked infection of several CD4 negative cell lines derived from the brain and colon. The hypothesis that GalCer might be involved in the process of HIV entry into these cells was further supported by the finding that recombinant gp120 bound GalCer with high affinity in a high performance thin layer chromatography (HPTLC) binding assay. We have examined the interactions between GalCer and gp120, and found that the oligosaccharides that constitute a large proportion of the molecular mass of this glycoprotein are not involved in binding to this glycolipid. Furthermore, using a panel of monoclonal and monospecific antibodies we have determined that gp120 binds GalCer, and the related molecule 3′ sulfo galactosylceramide (sulfatide), at a site that is conformationally close to the its principal neutralizing domain (V3 loop) or at the V3 loop itself.
AB - The primary receptor for the human immunodeficiency virus (HIV) is the CD4 molecule. However, a large body of evidence has demonstrated that some cells that do not express the CD4 receptor can be infected by HIV-1 and HIV-2, indicating that an alternative mechanism of infection must exist for some cell types, Recently it was reported that antibodies against the glycosphingolipid. galactosylceramide (Galβ1-1′Cer;GalCer), blocked infection of several CD4 negative cell lines derived from the brain and colon. The hypothesis that GalCer might be involved in the process of HIV entry into these cells was further supported by the finding that recombinant gp120 bound GalCer with high affinity in a high performance thin layer chromatography (HPTLC) binding assay. We have examined the interactions between GalCer and gp120, and found that the oligosaccharides that constitute a large proportion of the molecular mass of this glycoprotein are not involved in binding to this glycolipid. Furthermore, using a panel of monoclonal and monospecific antibodies we have determined that gp120 binds GalCer, and the related molecule 3′ sulfo galactosylceramide (sulfatide), at a site that is conformationally close to the its principal neutralizing domain (V3 loop) or at the V3 loop itself.
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U2 - 10.1006/viro.1994.1287
DO - 10.1006/viro.1994.1287
M3 - Article
C2 - 8184533
AN - SCOPUS:0028226019
VL - 201
SP - 206
EP - 214
JO - Virology
JF - Virology
SN - 0042-6822
IS - 2
M1 - 71287
ER -