Predicted secondary structures of trans-spliced and permuted precursor tRNAs. (a) Mature tRNAAsp(GUC) in A. pernix and T. aggregans are formed by joining the 5' half and the 3' half at position 37/38 after splicing at the bulge-helix-bulge (BHB) motif. (b) The 5' half and the 3' half of trans-spliced tRNALys(CUU) in Staphylothermus hellenicus and S. marinus marinus join at position 30/31, same as the previously identified split tRNALys(CUU) in N. equitans . (c) Circularized permuted tRNAiMet(CAU) and tRNATyr(GUA) in Thermofilum pendens have the 3' half located upstream of the 5' half separated by intervening sequences represented in green. The two fragments join at position 59/60, same as the T-Ψ-C loop permuted tRNAs in the red alga C. merolae . Pre-tRNAAla(UGC) in C. merolae is shown for comparison. The 5' half of tRNA transcripts are represented in blue, the 3' halves in orange. Black arrows indicate positions of splicing. Anticodons are boxed in light blue.
Chan et al. Genome Biology 2011 12:R38 doi:10.1186/gb-2011-12-4-r38