Comparative examination of the polypeptides of herpes simplex virus: types 1 and 2

Polypeptides synthesized during productive infection of HSV-1 and HSV-2 were found to possess distinct characteristics in regard to localization within the cell, DNA-binding properties, and phosphorylation after synthesis. Continuous labeling for 14 hr or pulse-labeling at successive periods during the replicative cycle with radioactive precursors revealed two types of polypeptide localization: (a) selective accumulation or enhancement within the cytoplasm or nucleus with barely detectable concentrations elsewhere and (b) accumulation in significant concentrations within both cytoplasm and nucleus showing little selective enhancement. Of the polypeptides made during HSV-1 infection 22 were phosphorylated as compared with 16 phosphoproteins specified by HSV-2. Phosphorylation was also implicated in the generation of the four molecular forms comprising the ICP 5–8 complex. Twenty-three polypeptides with affinity for DNA were detected after either type of infection. Sufficient comparisons were made to provide a basis for the tentative listing of 20 polypeptides of HSV-1 with corresponding polypeptides of HSV-2.