Fig. 1. Sequence comparison of threonyl-tRNA synthetases.

The alignment of the eight known ThrRS sequences is summarized. The origin of the ThrRSs is as follows: H. sapiens (Homo sapiens), S. cerevisiae (Saccharomyces cerevisiae), E. coli (Escherichia coli), T. maritima (Thermotoga maritima), M. jannaschii (Methanococcus jannaschii), P. horikoshii (Pyrococcus horikoshii), A. pernix ThrRS-1 (Aeropyrum pernix, Genebank accession number Q9YFY3), A. pernix ThrRS-2 (Aeropyrum pernix, Genebank accession number Q9YDW0).