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1 NERC Institute of Virology and Environmental Microbiology, Mansfield Road, Oxford OX1 3SR, U.K.
and2 Department of Environmental Health Sciences, School of Public Health 408th, The University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294, U.S.A.
A DNA clone of RNA segment 8 (S8) of bluetongue virus type 10 (BTV-10), an orbivirus member of the Reoviridae family has been expressed to high levels (20 mg/1x109 cells) using an Autographa californica nuclear polyhedrosis virus expression vector (pA-cYM1). The expressed protein is similar to the authentic BTV phosphoprotein NS2, in its size, antigenicity, and also the manner of phosphorylation (e.g. same peptides and residues). Both mammalian and insect cell-derived NS2 proteins are phosphorylated at serine residues only. Using affinity column chromatography and a gel retardation assay, the expressed protein has been shown to possess ssRNA-binding ability, a property which is shown to be independent of the phosphorylation state of the protein. In immunoelectron micrographic studies, gold-labelled anti-expressed NS2 antibodies have been used to localize the NS2 protein within the viral inclusion bodies (VIBs) in BTV-infected mammalian cells. Large inclusion bodies, morphologically similar to VIBs, have been identified in the recombinant virus-infected Spodoptera frugiperda cells. These structures have been shown to react with gold-labelled anti-BTV-10 antisera, demonstrating the first direct evidence of the origin of inclusion bodies in orbivirus infection.
Received 7 March 1990;
accepted 24 May 1990.
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