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The polypeptides induced in cells infected with a Glasgow isolate of HSV-I (17 syn+) have been characterized by SDS polyacrylamide gel electrophoresis. Study of the kinetics of synthesis in three cell lines has detected a total of 52 polypeptides, 33 of which can be identified in polypeptide profiles of purified virions. These include six low mol. wt. polypeptides that have not been previously reported. Several polypeptides were labelled with glucosamine in infected BHK cells. The different polypeptide patterns obtained at permissive (31 degrees C) and nonpermissive (38 degrees C) temperature in cells infected with 16 temperature-sensitive (ts) mutants are reported. The effect of multiplicity of infection (m.o.i.) on the polypeptide profile has been examined for two of the DNA -ve mutants: below ten, the profile varied with the m.o.i. whereas above ten it was constant. All mutants were therefore examined at an m.o.i. of approx. 20. Mutants from the same complementation group showed very similar profiles. A number of general conclusions concerning control of protein synthesis in HSV infected cells can be made: (I) As most of the 16 ts mutants affected the synthesis of several or many polypeptides it follows that a large proportion of genome specifies controlling functions. (2) The high frequency with which some polypeptides were affected suggests they are at or near the terminus of biosynthetic pathways which are under multiple control. (3) Conversely, some polypeptides were affected with a low frequency suggesting that their synthesis is not dependent on the expression of many virus functions. (4) Several individual ts mutations lead to the synthesis of increased amounts of different large polypeptides. (5) Analysis of every band detectably affected by at least one ts mutation has disclosed nine classes of dependence relationship between polypeptide synthesis and the DNA phenotype of the mutants, illustrating that this relationship is complex and different for different polypeptides. (6) The inhibition of host protein synthesis by the virus may not be a simple single step process.

journal of general virology

Control of Protein Synthesis in Herpesvirus-infected Cells: Analysis of the Polypeptides Induced by Wild Type and Sixteen Temperature-sensitive Mutants of HSV strain 17