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The proteins specified by four Theiler's murine encephalomyelitis virus isolates in infected BHK-21 cells were studied. Their processing, sensitivity to trypsin, and the changeover after viral infection from synthesis of cellular proteins to synthesis of viral proteins were determined by one- and two-dimensional gel electrophoreses. The molecular weights and isoelectric points of the structural and nonstructural proteins of DA and WW isolates, which represent the less virulent subgroup of Theiler's murine encephalomyelitis virus, and of GDVII and FA isolates, which represent the virulent subgroup, were found to be the same. The sensitivity of DA and GDVII isolates to trypsin, as purified virions, and in infected cell extracts was similar. The shut-off of cellular protein synthesis in cells infected with the same two isolates and the changeover to the synthesis of viral proteins appeared to have the same pattern. These findings are interesting since the two subgroups of Theiler's murine encephalomyelitis virus differ in their pathogenicity, intracellular development in infected BHK-21 cells, and RNA composition, as determined by RNase T1 fingerprinting analysis.

Proteins induced in tissue culture by four isolates of Theiler's murine encephalomyelitis virus