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Temperature-sensitive steps in the transport of Semliki Forest virus envelope proteins in mosquito C6/36 cells

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Summary

We have analysed the temperature dependence of the transport of Semliki Forest virus (SFV) envelope proteins in mosquito cells, the natural host cells of alphaviruses. These cells are cultivated at a lower temperature (28 °C) and have a different lipid composition as compared to mammalian cells. When the incubation temperature was reduced at early times after infection, the onset of virus shedding was delayed and the maximal titers decreased correspondingly to the temperature. No virus was shed at 12 °C. No evidence was observed for a block of virus release due to a shift of the sites of virus maturation. When the incubation temperature was reduced at later times after infection a critical temperature of 12 °C was again observed. At this temperature no transport of viral proteins took place, p62 remained uncleaved, the glycan processing of E1 did not occur and the envelope proteins accumulated in a pre-Golgi compartment. We suggest a mathematical formula which allows the extrapolation of transport data to the temperature at which intracellular protein transport becomes blocked.

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Vallan, C., Schärer, C.G. & Koblet, H. Temperature-sensitive steps in the transport of Semliki Forest virus envelope proteins in mosquito C6/36 cells. Archives of Virology 134, 109–127 (1994). https://doi.org/10.1007/BF01379111

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  • DOI: https://doi.org/10.1007/BF01379111

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