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Journal of Virology, November 2000, p. 10407-10416, Vol. 74, No. 22
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Human Monoclonal Antibodies That Inhibit Binding of Hepatitis C Virus E2 Protein to CD81 and Recognize Conserved Conformational Epitopes

Kenneth G. Hadlock,1 Robert E. Lanford,2 Susan Perkins,1 Judy Rowe,1 Qing Yang,1 Shoshana Levy,3 Piero Pileri,4 Sergio Abrignani,4 and Steven K. H. Foung1,*

Departments of Pathology1 and Medicine,3 Stanford University, Stanford, California; Department of Virology and Immunology, Southwest Regional Primate Research Center, Southwestern Foundation for Biomedical Research, San Antonio, Texas2; and IRIS-Chiron, Siena, Italy4

Received 22 December 1999/Accepted 9 August 2000

The intrinsic variability of hepatitis C virus (HCV) envelope proteins E1 and E2 complicates the identification of protective antibodies. In an attempt to identify antibodies to E2 proteins from divergent HCV isolates, we produced HCV E2 recombinant proteins from individuals infected with HCV genotypes 1a, 1b, 2a, and 2b. These proteins were then used to characterize 10 human monoclonal antibodies (HMAbs) produced from peripheral B cells isolated from an individual infected with HCV genotype 1b. Nine of the antibodies recognize conformational epitopes within HCV E2. Six HMAbs identify epitopes shared among HCV genotypes 1a, 1b, 2a, and 2b. Six, including five broadly reactive HMAbs, could inhibit binding of HCV E2 of genotypes 1a, 1b, 2a, and 2b to human CD81 when E2 and the antibody were simultaneously exposed to CD81. Surprisingly, all of the antibodies that inhibited the binding of E2 to CD81 retained the ability to recognize preformed CD81-E2 complexes generated with some of the same recombinant E2 proteins. Two antibodies that did not recognize preformed complexes of HCV 1a E2 and CD81 also inhibited binding of HCV 1a virions to CD81. Thus, HCV-infected individuals can produce antibodies that recognize conserved conformational epitopes and inhibit the binding of HCV to CD81. The inhibition is mediated via antibody binding to epitopes outside of the CD81 binding site in E2, possibly by preventing conformational changes in E2 that are required for CD81 binding.

* Corresponding author. Mailing address: Stanford Medical School Blood Center, 800 Welch Rd., Palo Alto, CA 94304. Phone: (650) 723-6481. Fax: (650) 498-6283. E-mail: sfoung{at}leland.stanford.edu.

Journal of Virology, November 2000, p. 10407-10416, Vol. 74, No. 22
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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