Structure and function of aldopentose catabolism enzymes involved in oxidative non-phosphorylative pathways

Table 2 Available crystal structures of aldonolactonases belonging to the SMP30 superfamily

Enzyme EC number	PDB code	Organism	Resolution (Å)	Ligands	Quaternary structure	Refs.
Gluconolactonase EC 3.1.1.17	3DR2	Xanthomonas campestris	1.67	Ca²⁺	Dimer	[50]
SMP30	3G4E 3G4H 4GNB 4GNC	Homo sapiens	1.42 1.92 1.50 1.75	Ca²⁺ Zn²⁺ Ca²⁺ Ca²⁺, anhydroglucitol	Monomer	[51]
SMP30	4GN7 4GN8 4GN9 4GNA	Mus musculus	1.95 1.70 2.00 1.85	Ca²⁺ Ca²⁺, anhydroglucitol Ca²⁺, D-glucose Ca²⁺, xylitol	Monomer	[52]
Xylonolactonase EC 3.1.1.68	7PLB 7PLC 7PLD	Caulobacter crescentus	1.73 2.15 1.70	Fe²⁺, D-xylose Fe²⁺, D-xylose Fe²⁺, 4-hydroxy-2-pyrrolidone	Monomer	[48]

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