Identification of amino acid residues in CD81 critical for interaction with hepatitis C virus envelope glycoprotein E2.

Abstract:

:Human CD81 has been previously identified as the putative receptor for the hepatitis C virus envelope glycoprotein E2. The large extracellular loop (LEL) of human CD81 differs in four amino acid residues from that of the African green monkey (AGM), which does not bind E2. We mutated each of the four positions in human CD81 to the corresponding AGM residues and expressed them as soluble fusion LEL proteins in bacteria or as complete membrane proteins in mammalian cells. We found human amino acid 186 to be critical for the interaction with the viral envelope glycoprotein. This residue was also important for binding of certain anti-CD81 monoclonal antibodies. Mutating residues 188 and 196 did not affect E2 or antibody binding. Interestingly, mutation of residue 163 increased both E2 and antibody binding, suggesting that this amino acid contributes to the tertiary structure of CD81 and its ligand-binding ability. These observations have implications for the design of soluble high-affinity molecules that could target the CD81-E2 interaction site(s).

journal_name

J Virol

journal_title

Journal of virology

authors

Higginbottom A,Quinn ER,Kuo CC,Flint M,Wilson LH,Bianchi E,Nicosia A,Monk PN,McKeating JA,Levy S

doi

10.1128/jvi.74.8.3642-3649.2000

subject

Has Abstract

pub_date

2000-04-01 00:00:00

pages

3642-9

issue

8

eissn

0022-538X

issn

1098-5514

journal_volume

74

pub_type

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