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. 1990 Dec;64(12):5804–5811. doi: 10.1128/jvi.64.12.5804-5811.1990

Identification and characterization of a baculovirus occlusion body glycoprotein which resembles spheroidin, an entomopoxvirus protein.

J E Vialard 1, L Yuen 1, C D Richardson 1
PMCID: PMC248735  PMID: 2243377

Abstract

A 37-kDa polypeptide specified by Autographa californica nuclear polyhedrosis virus was found to share significant homology with Choristoneura biennis entomopoxyvirus spheroidin protein, which is the major component of entomopoxvirus occlusion bodies. Antibodies raised against spheroidin cross-reacted with the 37-kDa protein and confirmed its expression in the late phase of wild-type baculovirus infection. Immunoblot analysis and fluorescence microscopy demonstrated that the protein was associated with purified A. californica nuclear polyhedrosis virus occlusion bodies and was absent in purified virions. Immunofluorescence studies localized the protein to the periphery of occlusion bodies and the internal membranes of cells infected with wild-type baculovirus. The open reading frame encoding this spheroidinlike protein was inserted into a baculovirus expression vector, and recombinant protein was synthesized under control of the polyhedrin promoter. Studies of the recombinant protein demonstrated that it was heterogeneous in molecular mass as a result of N-linked glycosylation. Tunicamycin inhibited carbohydrate addition and yielded proteins of 34 and 33 kDa.

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Selected References

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