Figure 1.

Sequence comparison and tertiary structural elements of yeast aspartate and arginine isoacceptor tRNAs. (A) tRNA^Arg isoacceptors 1, 2 and 3 (the three major species decoding 96.1% of the arginine codons) show 53% identity. Isoacceptor 4 is distinguished from the other three in sharing only 33% of common nucleotides (this minor species decodes only 3.9% of the arginine codons). Percentage of identical residues was calculated considering all nucleotides (also those conserved in all canonical tRNAs) shared between the compared sequences. The secondary structural domains are indicated below the primary sequences. (B) Sequence comparison of tRNA₄^Arg and the single tRNA^Asp isoacceptor indicates 57% identity. These two sequences share a same length in their variable region and in the α and β domains of the D-loop.