Chrysanthemum stunt viroid: primary sequence and secondary structure.
The sequence of the 356 nucleotide residues of chrysanthemum stunt viroid (CSV) has been determined. Overlapping linear viroid fragments were obtained by partial ribonuclease digestion, radiolabelled in vitro at their 5'-ends, and sequenced using partial enzymic cleavage methods. Of the CSV sequence, 69% is contained in the published sequence of potato spindle tuber viroid (PSTV). Differences in the primary sequence of CSV and PSTV suggest that neither the positive nor putative negative strands of these two viroids code for functional polypeptide products. However, the two viroids can form similar secondary structures, implicating a role for viroid structure in replication.
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