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A portion of a cDNA clone containing coding sequences for both structural proteins (VP1 and VP2) of Aleutian mink disease parvovirus (ADV) was inserted into recombinant vaccinia viruses, VV:ADSP. Immunohistochemical staining of VV:ADSP-infected cells revealed that the ADV antigen was readily detected and localized in the nuclei of infected cells. Analysis of VV:ADSP-infected cell lystates indicated that both VP1 and VP2 were produced and comigrated with authentic VP1 and VP2 from ADV-infected Crandell feline kidney cells. These results suggested, therefore, that both VP1 and VP2 were synthesized from a single cloned transcript. CsCl density gradient centrifugation of partially purified VV:ADSP-infected cell lysates indicated that the majority of the antigen was located in a fraction with a density near 1.33 g/ml, indicative of empty ADV particles. Subsequent electron microscopic examination revealed the presence of 27-nm icosahedral virion-like structures at the same density, suggesting that the proteins self-assembled into empty virions. Furthermore, sera from eight of eight mice inoculated with VV:ADSP contained ADV-specific antibodies and two of these eight serum samples had neutralizing activity, indicating that the particles produced in VV:ADSP-infected cells were immunogenic. Finally, when lysates from VV:ADSP-infected cells were compared with standard ADV antigens in counterimmunoelectrophoresis assays, a similar pattern of specific reactivity was observed for sera from normal and infected mink.

Expression of Aleutian mink disease parvovirus capsid proteins by a recombinant vaccinia virus: self-assembly of capsid proteins into particles