Abstract
Plants infected with wild cucumber mosaic virus produce two virus-like particles (designated top component a and top component b) in addition to virus (designated bottom component). The bottom component and a mixture of top component a and top component b were isolated by means of sucrose-density gradient centrifugation. The molecular weights, determined by sedimentation and diffusion experiments, were 4.0·10 6 for top component a, 4.3·10 6 for top component b, and 7.0·10 6 for bottom component. These particles differ in their nucleic acid content. Top component a has no nucleic acid, top component b contains approx. 11% RNA, and bottom component contains approx. 35% RNA. The relative proportion of the 4 nucleotide bases in the RNA of top component b and in the RNA of bottom component are similar. Both have an unusually high proportion of cytosine. The amino acid compositions of the three components are quite similar.
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