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J. Virol., Sep 1995, 5497-5501, Vol 69, No. 9
NA Clarkson, R Kaufman, DM Lublin, T Ward, PA Pipkin, PD Minor, DJ Evans and JW Almond
CD55, or decay-accelerating factor (DAF), is a cell surface glycoprotein
which regulates complement activity by accelerating the decay of C3/C5
convertases. Recently, we and others have established that this molecule
acts as a cellular receptor for echovirus 7 and related viruses. DAF
consists of five domains: four short consensus repeats (SCRs) and a
serine/threonine-rich region, attached to the cell surface by a
glycosylphosphatidyl inositol anchor. Chinese hamster ovary cells stably
transfected with deletion mutants of DAF or DAF- membrane cofactor protein
recombinants were analyzed for virus binding. The results indicate that the
binding of echovirus 7 to DAF specifically requires SCR2, SCR3, and SCR4.
There is also a nonspecific requirement for the S/T-rich region which
probably functions to project the binding region away from the cell
membrane. The three nonpeptide modifications of DAF, N-linked
glycosylation, O-linked glycosylation, and the glycosylphosphatidyl
inositol anchor, are not required for virus binding. The SCRs of membrane
cofactor protein, the closest known relative of DAF, cannot substitute for
those of DAF with retention of virus binding activity. The monoclonal
antibody used to identify DAF as an echovirus receptor, and which inhibits
binding of the virus (monoclonal antibody 854), binds to SCR3.
Copyright © 1995, American Society for Microbiology
Characterization of the echovirus 7 receptor: domains of CD55 critical for virus binding
School of Animal and Microbial Sciences, University of Reading, Whiteknights, United Kingdom.
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