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Mandelate racemase (MR)-like subfamily of the enolase superfamily. Enzymes of this subgroup share three conserved carboxylate ligands for the essential divalent metal ion (usually Mg2+), two aspartates and a glutamate, and conserved catalytic residues, a Lys-X-Lys motif and a conserved histidine-aspartate dyad. Members of the MR subgroup are mandelate racemase, D-glucarate/L-idarate dehydratase (GlucD), D-altronate/D-mannonate dehydratase , D-galactonate dehydratase (GalD) , D-gluconate dehydratase (GlcD), and L-rhamnonate dehydratase (RhamD).
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