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The polypeptide products formed in two cell-free protein-synthetic systems programmed with encephalomyocarditis (EMC) virus ribonucleic acid (RNA) have been compared with the virus-specific proteins found in EMC-infected cells and with the capsid proteins of the purified virion. Tryptic peptides of35 S-methioninelabeled proteins from these three sources were compared by co-chromatography and electrophoresis and by isoelectric focussing. Fifty-two methionine-containing peptides were resolved in digests of material from infected cells, of which about one-third were also clearly present in digests of the virion capsid proteins. The product formed in response to EMC RNA in cell-free systems from Krebs mouse ascites tumor cells yielded 26 to 29 such peptides. Most of these peptides were shown to behave identically with virus-specific peptides from infected cells, whereas just under half of them appeared to be identical with peptides from the virion capsid proteins. The product formed in response to EMC RNA in the L-cell cell-free system was similar, whereas six additional EMC-specific peptides were detected in mixed Krebs L-cell systems. The results indicate that the EMC RNA genome is partially translated in the mouse cell-free systems used to yield products containing both virion capsid and virus-specific noncapsid polypeptides.

Synthesis of Capsid and Noncapsid Viral Proteins in Response to Encephalomyocarditis Virus Ribonucleic Acid in Animal Cell-Free Systems