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1 Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE
and2 Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, U.K.
The structures of two vaccinia virus genes (B15R and B18R) from near the right inverted terminal repeat are described. These genes encode proteins of 36.5K and 40.7K, respectively, which have an N-terminal hydrophobic sequence, possible sites for attachment of N-linked carbohydrate and a short string of hydrophobic residues near the C terminus. These properties are consistent with the mature proteins being either virion, cell surface or secretory glycoproteins. Protein sequence comparisons established that the two gene products are related to each other (20% identity) and to the immunoglobulin (Ig) superfamily. Intriguingly, the nearest homologues of these proteins in the SWISS-PROT (version 14) database are the human and murine interleukin-1 receptors, although both proteins are related to a wide range of Ig superfamily members, including the interleukin-6 receptor. The product of one of these genes is known to be expressed on the cell surface early during infection and immunity directed against it confer resistance to virus infection without directly neutralizing virus infectivity. We propose a novel method for virus immune evasion in which the product of one or both of these proteins may bind interleukin-1 and/or interleukin-6 and prevent these cytokines reaching their natural receptors. In consequence the inflammatory response would be diminished and virus replication enhanced.
Received 9 October 1990;
accepted 13 November 1990.
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