(R)-N-carboxymethyl-3-aminobutyric acid. We also determined the crystalstructures of SAV606 both in ligand-free form at 2.4 Åresolution and in complex with (R)-N-carboxymethyl-3-aminobutyric acid at 2.0 Åresolution. We found that SAV606 adopts an α/β hotdog fold and has an activesite at the dimeric interface. Examining the complexed structure, we noted that the substrate-binding loop comprising Tyr-53-Asn-61