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J Virol. 1968 October; 2(10): 1016-1027
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Sequential Protein Synthesis Following Vaccinia Virus Infection

¹ Laboratory of Biology of Viruses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20014

ABSTRACT

Inhibition of HeLa cell protein synthesis and the sequential synthesis of viral proteins were followed by pulse-labeling infected cells with ¹⁴C-phenylalanine. Proteins were resolved by polyacrylamide gel electrophoresis. The viral origin of native proteins was confirmed by immunodiffusion. The inhibition of host protein synthesis and the synthesis of early viral proteins occur 1 to 3 hr after infection. This early sequence of events also occurs in the presence of 5-fluorodeoxyuridine, an inhibitor of deoxyribonucleic acid synthesis. Other viral proteins are synthesized at a later time. Those proteins which are not made in the absence of viral deoxyribonucleic acid synthesis can be further subdivided into intermediate and late classes. The intermediate protein is synthesized before the late proteins but does not appear to be a precursor of them. Many more viral polypeptides were resolved by polyacrylamide gel electrophoresis after solubilization of the entire cytoplasmic fraction with sodium dodecyl sulfate. Virion and nonvirion proteins were identified. Kinetic experiments suggested that certain structural proteins as well as certain nonstructural proteins are made early, whereas others of both classes are made primarily at later times.

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