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Stereo representation of the structure of the wild-type E. coli AspAT complexed with 2-methyl-l-aspartate (16). The side chains of the six functionally important residues mutated in this study are shown by full bonds (Asn34, Ile37, Ser139, Asn142, Asn297, and Val387). The coenzyme pyridoxal 5′-phosphate, the substrate analog, and the side chains of Trp140 and Arg386 are also shown (open bonds). Asn297 belongs to the other subunit of the dimer (asterisk).
