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We compared the ability of two closely related truncated E2 glycoproteins (E2(660)) derived from hepatitis C virus (HCV) genotype 1a strains Glasgow (Gla) and H77c to bind a panel of conformation-dependent monoclonal antibodies (MAbs) and CD81. In contrast to H77c, Gla E2(660) formed disulfide-linked high molecular mass aggregates and failed to react with conformation-dependent MAbs and CD81. To delineate amino acid (aa) regions associated with protein aggregation and CD81 binding, several Gla-H77c E2(660) chimeric glycoproteins were constructed. Chimeras C1, C2 and C6, carrying aa 525-660 of Gla E2(660), produced disulfide-linked aggregates and failed to bind CD81 and conformation-dependent MAbs, suggesting that amino acids within this region are responsible for protein misfolding. The presence of Gla hypervariable region 1 (aa 384-406) on H77 E2(660), chimera C4, had no effect on protein folding or CD81 binding. Chimeras C3 and C5, carrying aa 384-524 or 407-524 of Gla E2(660), respectively, were recognized by conformation-dependent MAbs and yet failed to bind CD81, suggesting that amino acids in region 407-524 are important in modulating CD81 interaction without affecting antigen folding. Comparison of Gla and H77c E2(660) aa sequences with those of genotype 1a and divergent genotypes identified a number of variant amino acids, including two putative N-linked glycosylation sites at positions 476 and 532. However, introduction of G476N-G478S and/or D532N in Gla E2(660) had no effect on antigenicity or aggregation.

Original publication

DOI

10.1099/0022-1317-81-12-2873

Type

Journal article

Journal

J Gen Virol

Publication Date

12/2000

Volume

81

Pages

2873 - 2883

Keywords

Amino Acid Sequence, Animals, Antibodies, Monoclonal, Antibodies, Viral, Antigens, CD, Antigens, Viral, Binding Sites, Cell Line, Cricetinae, Disulfides, Epitopes, Flow Cytometry, Genotype, Glycosylation, Hepacivirus, Humans, Membrane Proteins, Molecular Sequence Data, Mutagenesis, Polymorphism, Genetic, Protein Binding, Protein Conformation, Protein Folding, Recombinant Fusion Proteins, Sequence Alignment, Sequence Deletion, Solubility, Tetraspanin 28, Viral Envelope Proteins