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Journal of Virology, December 2000, p. 11230-11239, Vol. 74, No. 23
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
The Vaccinia Virus Soluble Alpha/Beta Interferon (IFN) Receptor
Binds to the Cell Surface and Protects Cells from the Antiviral
Effects of IFN
Antonio
Alcamí,
Julian A.
Symons,
and
Geoffrey L.
Smith*
Sir William Dunn School of Pathology,
University of Oxford, Oxford OX1 3RE, United Kingdom
Received 15 June 2000/Accepted 13 September 2000
Poxviruses encode a broad range of proteins that interfere with
host immune functions, such as soluble versions of receptors for the
cytokines tumor necrosis factor, interleukin-1
, gamma interferon
(IFN-
), IFN-
/
, and chemokines. These virus-encoded cytokine
receptors have a profound effect on virus pathogenesis and enable the
study of the role of cytokines in virus infections. The vaccinia virus
(VV) Western Reserve gene B18R encodes a secreted protein with 3 immunoglobulin domains that functions as a soluble receptor for
IFN-
/
. We have found that after secretion B18R binds to both
uninfected and infected cells. The B18R protein present at the cell
surface maintains the properties of the soluble receptor, binding
IFN-
/
with high affinity and with broad species specificity, and
protects cells from the antiviral state induced by IFN-
/
. VV
strain Wyeth expressed a truncated B18R protein lacking the C-terminal
immunoglobulin domain. This protein binds IFN with lower affinity and
retains its ability to bind to cells, indicating that the C-terminal
region of B18R contributes to IFN binding. The replication of a VV B18R
deletion mutant in tissue culture was restricted in the presence of
IFN-
, whereas the wild-type virus replicated normally. Binding of
soluble recombinant B18R to cells protected the cultures from IFN and
allowed VV replication. This represents a novel strategy of virus
immune evasion in which secreted IFN-
/
receptors not only bind
the soluble cytokine but also bind to uninfected cells and protect them
from the antiviral effects of IFN-
/
, maintaining the cells'
susceptibility to virus infections. The adaptation of this soluble
receptor to block IFN-
/
activity locally will help VV to
replicate in the host and spread in tissues. This emphasizes the
importance of local effects of IFN-
/
against virus infections.
*
Corresponding author. Mailing address: Wright-Fleming
Institute, Imperial College School of Medicine, St. Mary's Campus,
Norfolk Place, London W2 1PG, United Kingdom. Phone: 44-207-594-3972. Fax: 44-207-594-3973. E-mail: glsmith{at}ic.ac.uk.

Present address: Division of Virology, Department of Pathology,
University of Cambridge, Cambridge CB2 1QP, United
Kingdom.

Present address: Department of Viral Diseases, Roche Discovery
Welwyn, Welwyn Garden City, Hertfordshire, AL7 3AY, United
Kingdom.
Journal of Virology, December 2000, p. 11230-11239, Vol. 74, No. 23
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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