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Two rabies virus-specific mRNA species were identified by analysis of their encoded proteins after translation of the partially purified species in Xenopus laevis oocytes. One of these coded for the virion surface glycoprotein (G protein), and the other coded for the major structural protein of the virion nucleocapsid (N protein). The G-mRNA sedimented in a sucrose density gradient at about 18S, and the N-mRNA had a sedimentation coefficient of approximately 16S. Their respective translation products were identified in a radioimmunoassay with specific monoclonal antibody probes that recognized only G or N proteins. Immunoprecipitates formed between the radiolabeled viral antigens synthesized in programmed oocytes and their respective monoclonal antibodies were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The glycoprotein antigen translated from G-mRNA in oocytes migrated in the gel ahead of the virion G protein with a migration rate that was similar to that of nonglycosylated intracellular glycoproteins from virus-infected cells. The results suggested that the branched-chain carbohydrate of G protein was not required for recognition by the particular monoclonal antibody used. The nucleocapsid antigen translated from N-mRNA in oocytes migrated to the same position in the gel as marker virion N protein. Both the electrophoretic mobility of virus-specific antigens in sodium dodecyl sulfate-polyacrylamide gel and the antibody concentration dependence for immunoprecipitations were criteria for identifying the individual viral proteins encoded by the two rabies mRNA's.
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