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. 1978 Aug;27(2):340–346. doi: 10.1128/jvi.27.2.340-346.1978

Effects of phosphorylation and pH on the association of NS protein with vesicular stomatitis virus cores.

G M Clinton, B W Burge, A S Huang
PMCID: PMC354172  PMID: 29135

Abstract

The proteins of vesicular stomatitis virus (VSV) were analyzed on the basis of charge as well as size in polyacrylamide gels containing urea and acetic acid. The phosphorprotein NS was resolved into two major species. The less phosphorylated NS1 species contained about 10% fewer phosphate residues than the second species, NS2. These two phosphorylated forms were compartmentalized both in the virus and in the infected cell cytoplasm. Cores from virions and the core-containing fraction of the infected cell cytoplasm contained only the NS1 form. All of the more highly phosphorylated NS2 form and some of the NS1 form were found to be free of cores, whether they were derived from virions or from the infected cell. Therefore, the degree of phosphorylation appeared to determine whether or not the NS protein became bound to VSV cores. Moreover, the amount of bound NS1 protein relative to nucleocapsids increased as the pH of the culture medium was raised from 6.6 to 7.4. Because an increased in pH increases VSV replication (Fiszman et al., J. Virol. 13:801-808, 1974; Palma and Huang, in W.S. Robinson and C.F. Fox, ed., Mechanisms of Virus Disease, ICN-UCLA Symposia, p. 87-100, 1974), the NS1 protein may either regulate overall VSV RNA synthesis or regulate the switch between transcription and replication.

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Selected References

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