FIG. 1.

Structure of the BMV tRNA-like 3′ region and the nomenclature for the motifs in SLC examined in this study. (A) Proposed secondary structure of the BMV 3′-terminal 200 nt based on the structure described by Fechter et al. (10). The nucleotides within SLC are in capital letters. Individual RNA motifs are in bold letters A to F. PSK and dashed lines indicate the two pseudoknot motifs and base pairing that form the pseudoknot. The nucleotides that participate in an unusual 3-bp interaction at the junction of stems B1 and B2 are boxed. (B) Secondary structure of SLC with the names of the various motifs. The clamped adenine is represented by a larger boldface A.