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Crude cytoplasmic extracts from vesicular stomatitis virus (VSV)-infected HeLa cells incorporate radioactive amino acids into hot trichloroacetic acid-precipitable material linearly for 10 to 20 min. The material synthesized in vitro corresponds in molecular weight to four of the five VSV structural proteins. However, synthesis of the viral glycoprotein (G) is significantly reduced, whereas the relative amounts of viral structural proteins L and NS synthesized are increased compared with the ratio of the proteins found in the virion. Fractionation of a VSV-infected crude cytoplasmic extract into a cytoplasmic pellet (20,000 x g for 30 min) and a cytoplasmic supernatant results in a significant reduction in protein synthesizing activity of both fractions, although both contain polysomes. The products synthesized by a cytoplasmic supernatant-directed system included all the VSV structural proteins except the glycoprotein, whereas in an in vitro system directed by the cytoplasmic pellet there is a marked reduction in synthesis of the nucleoprotein (N) and also a small relative increase in synthesis of the glycoprotein. Addition of uninfected, preincubated HeLa or L-cell S10 or a HeLa ribosomal fraction to the VSV-infected cytoplasmic pellet results in a 30- to 60-fold stimulation of (35)S-methionine incorporation. However, these uninfected extracts do not stimulate (35)S-methionine incorporation by the infected crude cytoplasmic extract or the cytoplasmic supernatant. The products synthesized by the stimulated cytoplasmic pellet now include sizeable amounts of the glycoprotein in addition to the other VSV structural proteins.

In Vitro Protein-Synthesizing Activity of Vesicular Stomatitis Virus-Infected Cell Extracts