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J. Virol., Aug 1995, 4633-4639, Vol 69, No. 8
A Alcami and GL Smith
Soluble receptors for gamma interferon (IFN-gamma) are secreted from cells
infected by 17 orthopoxviruses, including vaccinia, cowpox, rabbitpox,
buffalopox, elephantpox, and camelpox viruses, representing three species
(vaccinia, cowpox, and campelpox viruses). The B8R open reading frame of
vaccinia virus strain Western Reserve, which has sequence similarity to the
extracellular binding domain of cellular IFN- gamma receptors (IFN-gamma
Rs), is shown to encode an IFN-gamma binding activity by expression in
recombinant baculovirus. The soluble virus IFN-gamma Rs bind IFN-gamma and,
by preventing its interaction with the cellular receptor, interfere with
the antiviral effects induced by this cytokine. Interestingly, in contrast
to cellular IFN-gamma Rs, which are highly species specific, the vaccinia,
cowpox, and camelpox virus IFN-gamma Rs bind and inhibit the biological
activity of human, bovine, and rat IFN-gamma but not mouse IFN-gamma. This
unique broad species specificity of the IFN-gamma R would aid virus
replication in different species and suggests that vaccinia, cowpox, and
camelpox viruses may have evolved in several species, possibly including
humans but excluding mice. Last, the conservation of an IFN-gamma R in
orthopoxviruses emphasizes the importance of IFN-gamma in defense against
poxvirus infections.
Copyright © 1995, American Society for Microbiology
Vaccinia, cowpox, and camelpox viruses encode soluble gamma interferon receptors with novel broad species specificity
Sir William Dunn School of Pathology, University of Oxford, United Kingdom.
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