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J Virol. 1989 December; 63(12): 5111-5118

Role of heterologous and homologous glycoproteins in phenotypic mixing between Sendai virus and vesicular stomatitis virus.

K Metsikkö and H Garoff

Department of Molecular Biology, Huddinge University Hospital, Sweden.

ABSTRACT

Phenotypic mixing between Sendai virus and vesicular stomatitis virus (VSV) or the mutant VSV ts045 was studied. Conditions were optimized for double infection, as shown by immunofluorescence microscopy. Virions from double-infected cells were separated by sequential velocity and isopycnic gradient centrifugations. Two types of particles with mixed protein compositions were found. One type was VSV particles with Sendai virus spikes, i.e., phenotypically mixed particles. A second type was Sendai virus-VSV associations, which in plaque assays also behaved as phenotypically mixed particles. The ratio of VSV G protein to Sendai virus glycoproteins on the cell surface was varied, using the VSV mutant ts045 in double infections. Thus, different amounts of the VSV G protein were allowed to reach the cell surface at 32, 38, and 39 degrees C in Sendai virus-infected cells. However, a fixed number of Sendai virus spikes was always found in the ts045 virions. This represented 12 to 16% of the number of G proteins present in normal VSV. Furthermore, the yield of ts045 virions was radically reduced during double infection when the temperature was raised to block G-protein transport to the cell surface, suggesting that the Sendai virus glycoproteins were not able to compensate for G protein in budding. These results emphasize the role of the G protein in VSV assembly.

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J Virol. 1989 December; 63(12): 5111-5118

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