Abstract
The relatedness of several double-stranded RNAs (dsRNA's) present in the virus-like particles of yeast was examined by T1 fingerprint analysis. The dsRNA's examined were L, the dsRNA encoding the capsid polypeptide of yeast virus-like particles; M, which appears to code for a toxic polypeptide and for resistance to the effects of the toxin; and two S dsRNA's present in particles analogous to the defective interfering particles of animal viruses. S3, a dsRNA of 0.46 X 10(6) daltons, was derived entirely from M, a dsRNA of 1.2 X 10(6) daltons. S1, a dsRNA of 0.92 X 10(6) daltons, was a duplication of S3. This conclusion has also been reached independently by heteroduplex mapping techniques (H. M. Fried and G. R. Fink, personal communication). S1 and S3, at least in one yeast strain, were unstable in sequence, apparently due to the accumulation of sequence variants of the same molecular weight. L was a species of 3 X 10(6) daltons, unrelated in sequence to M, S1, or S3. S1, S3, and M had a 3' T1 dodecanucleotide in common.
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