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Thermotoga maritima β-fructosidase (invertase)
Introduction
The β-fructosidase (β-D-fructofuranosidase EC 3. 2. 1. 26.) of the thermophilic baterium Thermotoga maritima is an enzyme which hydrolyzes sucrose to release fructose and glucose. 
This enzyme achieves the hydrolysis with a retention molecular mechanism. Actually, the invertase hydrolyses the D-sucrose to form the D-fructose and the D-glucose. So, the substrate anomeric configuration is conserved in products. The β-fructosidase belongs to the GH32 (Glycoside hydrolysases 32) according to the sequence-based classification of glycoside hydrolysases.
The GH32 family
The GH32 family includes over 370 members from plants, fungi and bacteria. This family contains not only invertases but other fructofuranosidases like insulinase, transfructosidase or inulinase. The glycoside hydrolases (GH) constitute a widespread enzyme group presenting a huge variety of protein folds and substrate specificities. They share a common feature which are two important amino acid residues. These two amino acid residues constitute the catalytic machinery accountable to the glycosidic bond cleavage.
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