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Yields of greater than 10(7) p.f.u./ml at 28 or 37 degrees C of the alphavirus Sindbis and the flavivirus Kunjin were obtained in the Aedes Albopictus (Singh) cell line, the latent periods being 4 to 6 and 10 to 12 h, respectively. Despite a high background of host protein synthesis, virtually all the virus-specified proteins of the flaviviruses Kunjin, Dengue-2 and Japanese encephalitis were labelled and resolved by slab gel electrophoresis of infected and uninfected cell proteins. In contrast, only one induced protein, of mol. wt. 30 000, was identified in cells labelled during Sindbis virus infection. The envelope glycoprotein V3 of Kunjin virus was resolved as a double band in samples of infected cytoplasm labelled with 3H-glucosamine, similar to that of carbohydrate-labelled V3 in vertebrate (Vero) cells. Attempts to reduce host protein synthesis selectively during labelling periods were unsuccessful using either a hypertonic inhibition block or treatment with 0.1 mu g actinomycin D per ml. The most efficient labelling of Kunjin virus-specified proteins was achieved at 37 degrees C in the presence of actinomycin D. The largest non-structural flavivirus protein NV5 migrated slightly faster than NV5 from infected vertebrate (Vero) cells. The small non-structural proteins NV1, NV1 1/2 and NV2 from infected mosquito cells were successively trimmed during post translational periods exceeding 70 min, compared to much shorter periods reported previously for post translational modifications of these proteins in vertebrate cells.

Proteins Specified by Togaviruses in Infected Aedes albopictus (Singh) Mosquito Cells