Alignment of parasite AspATs with selected eukaryotic enzymes. The enzymes are as follows: CfC, C. fasciculata cytoplasmic AspAT; Pf, P. falciparum AspAT; GiC, G. intestinalis cytoplasmic AspAT; TbC, T. brucei brucei cytoplasmic AspAT; TbM, T. brucei brucei mitochondrial AspAT, HuC, Homo sapiens cytoplasmic AspAT; ChC, Gallus gallus cytoplasmic AspAT; YeC, S. cerevisiae cytoplasmic AspAT; HuM, H. sapiens mitochondrial AspAT; ChM, G. gallus mitochondrial AspAT; and YeM, S. cerevisiae mitochondrial AspAT. Boxes surround residues which are conserved across all 11 sequences, while the underlined residues in the C. fasciculata enzyme represent the sequence determined previously by amino acid sequencing of a purified aminotransferase (7). The residues marked with asterisks are those reported by Jensen and Gu (23) as being conserved in all members of the Ia subfamily of aminotransferases, while those marked with number signs are those reported by Mehta et al. (33) as being conserved in all aminotransferase families.