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Exposure of Sindbis virus-infected chicken embryo cells to a short pulse of radioactive amino acids revealed the formation of primarily three proteins: the nucleocapsid (C) of the virus, one of the viral envelope proteins (E1), and a glycoprotein that did not appear in the virion. This third protein (PE2) has now been identified as a precursor of the other viral envelope protein (E2) on the basis of two observations: (i) the simultaneous disappearance of radioactive PE2 and appearance of labeled E2 in pulse-chase experiments, and (ii) the identity of14 C-arginine tryptic peptides in fingerprints of the two proteins. The nucleocapsid was the most heavily labeled protein in the cell and appeared in the virus during the short pulse. The two14 C-labeled envelope proteins, although having different kinetics of labeling in the cell, appeared simultaneously in the virus only after the chase. Addition of pactamycin, a drug inhibiting initiation of protein synthesis, preferentially inhibited the formation of capsid protein Assuming that Sindbis virus proteins are formed initially as a single polypeptide, our studies locate the nucleocapsid at the amino-terminal end of the polypeptide chain.

Formation of Sindbis Virus Proteins: Identification of a Precursor for One of the Envelope Proteins