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Title 

An 80-kilodalton protein that binds to the pre-S1 domain of Hepatitis B Virus

Authors 

Chun Jeih RyuDae Yeon ChoPhilippe GriponHee Sun KimChristiane Guguen-GuillouzoHyo Jeong Hong

Publisher 

American Society for Microbiology

Issue Date 

2000

Citation 

Journal of Virology, vol. 74, no. 1, pp. 110-116

Keywords 

glutathione transferasehybrid proteinanimal cellbinding sitebiotinylationHepatitis B virushumanhuman cellnonhumanprotein binding

Abstract 

It has been suggested that hepatitis B virus (HBV) binds to a receptor on the plasma membrane of human hepatocytes via the pre-S1 domain of the large envelope protein as an initial step in HBV infection. However, the nature of the receptor remains controversial. In an attempt to identify a cell surface receptor for HBV, purified recombinant fusion protein of the pre-S1 domain of HBV with glutathione S-transferase (GST), expressed in Escherichia coli, was used as a ligand. The surface of human hepatocytes or HepG2 cells was biotinylated, and the cell lysate (precleared lysate) which did not bind to GST and glutathione-Sepharose beads was used as a source of receptor molecules. The precleared lysate of the biotinylated cells was incubated with the GST-pre-S1 fusion protein, and the bound proteins were visualized by Western blotting and enhanced chemiluminescence. An approximately 80-kDa protein (p80) was shown to bind specifically to the pre- S1 domain of the fusion protein. The receptor binding assay using serially or internally deleted segments of pre-S1 showed that amino acid residues 12 to 20 and 82 to 90 are essential for the binding of pre-S1 to p80. p80 also bound specifically to the pre-S1 of native HBV particles. Analysis of the tissue and species specificity of p80 expression in several available human primary cultures and cell lines of different tissue origin showed that p80 expression is not restricted to human hepatocytes. Taken together the results suggest that p80 may be a component of the viral entry machinery.

ISSN 

0022-538X

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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