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Journal of Virology, August 1999, p. 6235-6244, Vol. 73, No. 8
0022-538X/99/$04.00+0
Characterization of Hepatitis C Virus E2
Glycoprotein Interaction with a Putative Cellular Receptor,
CD81
Mike
Flint,1
Catherine
Maidens,1
Larry D.
Loomis-Price,2
Christine
Shotton,1
Jean
Dubuisson,3
Peter
Monk,4
Adrian
Higginbottom,4
Shoshana
Levy,5 and
Jane A.
McKeating1,*
School of Animal & Microbial Sciences, University of
Reading, Reading RG6 6AJ,1 and
Department of Molecular Biology and Biotechnology,
University of Sheffield, Sheffield S10 2UH,4
United Kingdom; Henry M. Jackson Foundation, Rockville,
Maryland 208502; CNRS-UMR319,
IBL/Institut Pasteur de Lille, 59021 Lille Cedex,
France3; and Department of Medicine,
Division of Oncology, Stanford Medical School, Stanford, California
943055
Received 9 February 1999/Accepted 20 April 1999
A truncated soluble form of the hepatitis C virus E2 glycoprotein,
E2661, binds specifically to the surface of cells
expressing human CD81 (hCD81) but not other members of the tetraspanin
family (CD9, CD63, and CD151). No differences were noted between the level of E2661 binding to hCD81 expressed on the surface of
rat RBL or KM3 cells compared to Daudi and Molt-4 cells, suggesting that additional human-cell-specific factors are not required for the
primary interaction of E2 with the cell surface. E2 did not interact
with African green monkey (AGM) CD81 on the surface of COS cells, which
differs from the hCD81 sequence at four residues within the second
extracellular region (EC2) (amino acids [aa] 163, 186, 188, and 196),
suggesting that one or more of these residues defines the site of
interaction with E2. Various recombinant forms of CD81 EC2 show
differences in the ability to bind E2, suggesting that CD81
conformation is important for E2 recognition. Regions of E2 involved in
the CD81 interaction were analyzed, and our data suggest that the
binding site is of a conformational nature involving aa 480 to 493 and
544 to 551 within the E2 glycoprotein. Finally, we demonstrate that
ligation of CD81 by E2661 induced aggregation of lymphoid
cells and inhibited B-cell proliferation, demonstrating that E2
interaction with CD81 can modulate cell function.
*
Corresponding author. Mailing address: School of Animal
& Microbial Sciences, University of Reading, Reading RG6 6AJ, United Kingdom. Phone: (44) 1189 875 123, ext. 7892. Fax: (44) 1189 316 671. E-mail: j.a.mckeating{at}reading.ac.uk.
Journal of Virology, August 1999, p. 6235-6244, Vol. 73, No. 8
0022-538X/99/$04.00+0
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