Glycosyl hydrolase family 32, beta-fructosidases. Glycosyl hydrolase family GH32 cleaves sucrose into fructose and glucose via beta-fructofuranosidase activity, producing invert sugar that is a mixture of dextrorotatory D-glucose and levorotatory D-fructose, thus named invertase (EC 3.2.1.26). This family also contains other fructofuranosidases such as inulinase (EC 3.2.1.7), exo-inulinase (EC 3.2.1.80), levanase (EC 3.2.1.65), and transfructosidases such sucrose:sucrose 1-fructosyltransferase (EC 2.4.1.99), fructan:fructan 1-fructosyltransferase (EC 2.4.1.100), sucrose:fructan 6-fructosyltransferase (EC 2.4.1.10), fructan:fructan 6G-fructosyltransferase (EC 2.4.1.243) and levan fructosyltransferases (EC 2.4.1.-). These retaining enzymes (i.e. they retain the configuration at anomeric carbon atom of the substrate) catalyze hydrolysis in two steps involving a covalent glycosyl enzyme intermediate: an aspartate located close to the N-terminus acts as the catalytic nucleophile and a glutamate acts as the general acid/base; a conserved aspartate residue in the Arg-Asp-Pro (RDP) motif stabilizes the transition state. These enzymes are predicted to display a 5-fold beta-propeller fold as found for GH43 and CH68. The breakdown of sucrose is widely used as a carbon or energy source by bacteria, fungi, and plants. Invertase is used commercially in the confectionery industry, since fructose has a sweeter taste than sucrose and a lower tendency to crystallize. A common structural feature of all these enzymes is a 5-bladed beta-propeller domain, similar to GH43, that contains the catalytic acid and catalytic base. A long V-shaped groove, partially enclosed at one end, forms a single extended substrate-binding surface across the face of the propeller.

Sucrose-6-phosphate hydrolase SacC, GH32 family [Carbohydrate transport and metabolism].

Glycosyl hydrolases family 32 N-terminal domain. This domain corresponds to the N-terminal domain of glycosyl hydrolase family 32 which forms a five bladed beta propeller structure.

Glycosyl hydrolases family 32.

glycoside hydrolase family 32 protein such as Thermotoga maritima invertase (BfrA or Tm1414). This subfamily of glycosyl hydrolase family GH32 includes beta-fructosidase (invertase, EC 3.2.1.26) that cleaves sucrose into fructose and glucose via beta-fructofuranosidase activity, producing invert sugar that is a mixture of dextrorotatory D-glucose and levorotatory D-fructose, thus named invertase. These retaining enzymes (i.e. they retain the configuration at anomeric carbon atom of the substrate) catalyze hydrolysis in two steps involving a covalent glycosyl enzyme intermediate: an aspartate located close to the N-terminus acts as the catalytic nucleophile and a glutamate acts as the general acid/base; a conserved aspartate residue in the Arg-Asp-Pro (RDP) motif stabilizes the transition state. The breakdown of sucrose is widely used as a carbon or energy source by bacteria, fungi, and plants. Invertase is used commercially in the confectionery industry, since fructose has a sweeter taste than sucrose and a lower tendency to crystallize. A common structural feature of all these enzymes is a 5-bladed beta-propeller domain, similar to GH43, that contains the catalytic acid and catalytic base. A long V-shaped groove, partially enclosed at one end, forms a single extended substrate-binding surface across the face of the propeller.

Thethree-dimensional structure of beta-fructosidase (invertase) from Thermotoga maritima [Thermotoga maritima MSB8],1UYP_B The three-dimensional structure of beta-fructosidase (invertase) from Thermotoga maritima [Thermotoga maritima MSB8],1UYP_C The three-dimensional structure of beta-fructosidase (invertase) from Thermotoga maritima [Thermotoga maritima MSB8],1UYP_D The three-dimensional structure of beta-fructosidase (invertase) from Thermotoga maritima [Thermotoga maritima MSB8],1UYP_E The three-dimensional structure of beta-fructosidase (invertase) from Thermotoga maritima [Thermotoga maritima MSB8],1UYP_F The three-dimensional structure of beta-fructosidase (invertase) from Thermotoga maritima [Thermotoga maritima MSB8]

beta-fructosidasefrom Thermotoga maritima in complex with raffinose [Thermotoga maritima MSB8],1W2T_B beta-fructosidase from Thermotoga maritima in complex with raffinose [Thermotoga maritima MSB8],1W2T_C beta-fructosidase from Thermotoga maritima in complex with raffinose [Thermotoga maritima MSB8],1W2T_D beta-fructosidase from Thermotoga maritima in complex with raffinose [Thermotoga maritima MSB8],1W2T_E beta-fructosidase from Thermotoga maritima in complex with raffinose [Thermotoga maritima MSB8],1W2T_F beta-fructosidase from Thermotoga maritima in complex with raffinose [Thermotoga maritima MSB8]

ChainA, Sucrose-6-phosphate hydrolase [Frischella perrara],7VCP_A Chain A, Sucrose-6-phosphate hydrolase [Frischella perrara]

Bombyxmori GH32 beta-fructofuranosidase BmSUC1 [Bombyx mori]

Bombyxmori GH32 beta-fructofuranosidase BmSUC1 mutant D63A in complex with sucrose [Bombyx mori]

Beta-fructosidase OS=Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8) OX=243274 GN=bfrA PE=1 SV=1

Raffinose invertase OS=Escherichia coli OX=562 GN=rafD PE=3 SV=1

Sucrose-6-phosphate hydrolase OS=Escherichia coli OX=562 GN=cscA PE=3 SV=1

Sucrose-6-phosphate hydrolase OS=Zymomonas mobilis subsp. mobilis (strain ATCC 10988 / DSM 424 / LMG 404 / NCIMB 8938 / NRRL B-806 / ZM1) OX=555217 GN=sacA PE=3 SV=1

Sucrose-6-phosphate hydrolase OS=Zymomonas mobilis subsp. mobilis (strain ATCC 31821 / ZM4 / CP4) OX=264203 GN=sacA PE=1 SV=1