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J. Virol., Dec 1997, 9306-9312, Vol 71, No. 12
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

RM Powell, T Ward, DJ Evans and JW Almond
School of Animal and Microbial Sciences, University of Reading, Whiteknights, United Kingdom.

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.


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Copyright © 1997 by the American Society for Microbiology. All rights reserved.