- Crystals of Thermus thermophilus tRNAAsp complexed with its cognate aspartyl-tRNA synthetase have a solvent content of 75%. Comparison with other aminoacylation systems. Briand, C., Poterszman, A., Mitschler, A., Yusupov, M., Thierry, J.C., Moras, D. Acta Crystallogr. D Biol. Crystallogr. (1998)