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Receptor-binding properties of a purified fragment of the 4070A amphotropic murine leukemia virus envelope glycoprotein.

Battini, JL; Rodrigues, P; Müller, R; Danos, O; Heard, JM; (1996) Receptor-binding properties of a purified fragment of the 4070A amphotropic murine leukemia virus envelope glycoprotein. J Virol , 70 (7) pp. 4387-4393.

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Abstract

A 208-amino-acid amino-terminal fragment of the 4070A amphotropic murine leukemia virus envelope glycoprotein contains all of the determinants required to recognize cell surface amphotropic receptors. This fragment was fused with a streptavidin-binding tag, expressed in Sf9 insect cells by using a baculovirus vector, and purified to homogeneity. The (125)I-labeled purified fragment (AS208) specifically bound various cell lines susceptible to amphotropic murine leukemia virus infection. The number of AS208-binding sites was in the range of 7 X 10(4) to 17 X 10(4) per cell. Quantitative analysis of binding revealed that AS208-binding sites are heterogeneous with regard to ligand binding affinity or that cooperativity exists between receptors. Competition experiments showed that the concentration of AS208 required to inhibit virus entry was lower than that required to inhibit the binding of virus particles at the cell surface. Taken together, these data suggested that amphotropic envelope-binding sites present at the cell surface do not act independently and do not participate equally in virus infection.

Type: Article
Title: Receptor-binding properties of a purified fragment of the 4070A amphotropic murine leukemia virus envelope glycoprotein.
Location: United States
Keywords: 3T3 Cells, Amino Acid Sequence, Animals, Base Sequence, CHO Cells, Carrier Proteins, Cell Line, Cricetinae, DNA Primers, Humans, Leukemia Virus, Murine, Membrane Glycoproteins, Membrane Proteins, Mice, Molecular Sequence Data, Peptide Fragments, Receptors, Virus, Spodoptera, Tumor Cells, Cultured, Viral Envelope Proteins
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Haematology
URI: http://discovery.ucl.ac.uk/id/eprint/90904
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