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J. Virol., Dec 1997, 9306-9312, Vol 71, No. 12
RM Powell, T Ward, DJ Evans and JW Almond
Soluble forms of decay-accelerating factor (DAF) (CD55), the receptor for
echovirus 7, were synthesized in the yeast Pichia pastoris. Purified
recombinant protein containing SCR domains 2, 3, and 4, but lacking the
serine/threonine rich region, was shown to block infection of susceptible
cells by echovirus 7. In contrast to the situation with poliovirus and its
receptor, the neutralization of echovirus 7 by soluble DAF was completely
reversible and did not lead to the formation of 135S A-particles. Binding
of virus to susceptible cells, by contrast, did lead to the formation of A
particles, mainly from virus that had been internalized. The data suggest
that a secondary factor(s) may contribute to A-particle formation and
uncoating of echovirus 7.
Copyright © 1997, American Society for Microbiology
Interaction between echovirus 7 and its receptor, decay-accelerating factor (CD55): evidence for a secondary cellular factor in A-particle formation
School of Animal and Microbial Sciences, University of Reading, Whiteknights, United Kingdom.
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