Abstract
A study was made of the in vivo incorporation of C 14-aspartic acid into the protein of tobacco mosaic virus (TMV) as isolated from the chloroplast fraction, TMV as isolated from the remainder of the leaf homogenate, and the low molecular weight, abnormal soluble antigen which is found in virus-infected leaves. The experimental findings show the TMV from the chloroplast fraction to be metabolically distinct from the virus as isolated from the remainder of the leaf homogenate, and they are consistent with the hypothesis that TMV protein is synthesized within the chloroplast, or that the protein and nucleic acid portions of TMV are assembled within the chloroplast. They also support the view that the soluble antigen is the precursor of the protein part of the virus. Attempts to obtain incorporation of C 14-aspartic acid into TMV and the soluble antigen in cell-free preparations of infected leaves were unsuccessful.
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