Figure 2
Distribution of BHB motifs in intronic and/or permuted tRNAs in C. merolae.
(A) Arrows indicate the positions of the BHB motifs. The length of the intron, number and type of BHB motifs is indicated for each tRNA. For example, “Ile(TAT) 22 3/3 hBHBh′” at the position between 53 and 54 means that the BHB is from tRNAIle(UAU), is 22 nt long and is the third of three BHB motifs. BHB motifs at the termini of the permuted pre-tRNAs are shown in double squares. The numbering of the tRNA positions follows that outlined in Reference 12. (B) The BHB motif is classified by one or two 3-nt-bulges (denoted as B = 3) separated by a central 4-bp-helix (denoted as H = 4) and flanked by two helices (denoted as h or h′), each with more than two base-pairings.
