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The ref(2)P gene is one of the Drosophila melanogaster genes involved in the inhibition of sigma rhabdovirus multiplication. The partial restriction of viral replication varies according to the ref(2)P alleles and virus strains and involves intracellular interactions between parasite and host products. We identified the protein encoded by the ref(2)P gene and produced polyclonal antibodies directed against the whole ref(2)P protein obtained from a recombinant baculovirus and against a part of the protein expressed as a fusion protein. These antibodies were used to study the interactions with sigma virus proteins by different immunoprecipitation techniques. We showed that the native ref(2)P protein shared conformation-dependent common epitopes with the viral structural genome-associated N protein. Furthermore, the cellular protein was found to be associated in complexes with the viral P protein required for RNA polymerase activity. The significance of these observations in the control of sigma virus multiplication by its host is discussed.

Immunological cross-reactions and interactions between the Drosophila melanogaster ref(2)P protein and sigma rhabdovirus proteins