Glycosyl hydrolases family 31. Glycosyl hydrolases are key enzymes of carbohydrate metabolism. Family 31 comprises of enzymes that are, or similar to, alpha- galactosidases.

glucosidase NET37. NET37 (also known as KIAA1161) is a human lamina-associated nuclear envelope transmembrane protein. A member of the glycosyl hydrolase family 31 (GH31) , it has been shown to be required for myogenic differentiation of C2C12 cells. Related proteins are found in eukaryotes and prokaryotes. Enzymes of the GH31 family possess a wide range of different hydrolytic activities including alpha-glucosidase (glucoamylase and sucrase-isomaltase), alpha-xylosidase, 6-alpha-glucosyltransferase, 3-alpha-isomaltosyltransferase and alpha-1,4-glucan lyase. All GH31 enzymes cleave a terminal carbohydrate moiety from a substrate that varies considerably in size, depending on the enzyme, and may be either a starch or a glycoprotein.

Alpha-glucosidase, glycosyl hydrolase family GH31 [Carbohydrate transport and metabolism].

alpha-xylosidase YicI-like. YicI alpha-xylosidase is a glycosyl hydrolase family 31 (GH31) enzyme that catalyzes the release of an alpha-xylosyl residue from the non-reducing end of alpha-xyloside substrates such as alpha-xylosyl fluoride and isoprimeverose. YicI forms a homohexamer (a trimer of dimers). All GH31 enzymes cleave a terminal carbohydrate moiety from a substrate that varies considerably in size, depending on the enzyme, and may be either a starch or a glycoprotein. The YicI family corresponds to subgroup 4 in the Ernst et al classification of GH31 enzymes.

glycosyl hydrolase family 31 (GH31). GH31 enzymes occur in prokaryotes, eukaryotes, and archaea with a wide range of hydrolytic activities, including alpha-glucosidase (glucoamylase and sucrase-isomaltase), alpha-xylosidase, 6-alpha-glucosyltransferase, 3-alpha-isomaltosyltransferase and alpha-1,4-glucan lyase. All GH31 enzymes cleave a terminal carbohydrate moiety from a substrate that varies considerably in size, depending on the enzyme, and may be either a starch or a glycoprotein. In most cases, the pyranose moiety recognized in subsite -1 of the substrate binding site is an alpha-D-glucose, though some GH31 family members show a preference for alpha-D-xylose. Several GH31 enzymes can accommodate both glucose and xylose and different levels of discrimination between the two have been observed. Most characterized GH31 enzymes are alpha-glucosidases. In mammals, GH31 members with alpha-glucosidase activity are implicated in at least three distinct biological processes. The lysosomal acid alpha-glucosidase (GAA) is essential for glycogen degradation and a deficiency or malfunction of this enzyme causes glycogen storage disease II, also known as Pompe disease. In the endoplasmic reticulum, alpha-glucosidase II catalyzes the second step in the N-linked oligosaccharide processing pathway that constitutes part of the quality control system for glycoprotein folding and maturation. The intestinal enzymes sucrase-isomaltase (SI) and maltase-glucoamylase (MGAM) play key roles in the final stage of carbohydrate digestion, making alpha-glucosidase inhibitors useful in the treatment of type 2 diabetes. GH31 alpha-glycosidases are retaining enzymes that cleave their substrates via an acid/base-catalyzed, double-displacement mechanism involving a covalent glycosyl-enzyme intermediate. Two aspartic acid residues have been identified as the catalytic nucleophile and the acid/base, respectively.

Crystalstructure of a novel alpha-galactosidase from Pedobacter saltans [Pseudopedobacter saltans],4XPP_A Crystal structure of Pedobacter saltans GH31 alpha-galactosidase complexed with D-galactose [Pseudopedobacter saltans],4XPQ_A Crystal structure of Pedobacter saltans GH31 alpha-galactosidase complexed with L-fucose [Pseudopedobacter saltans]

Crystalstructure of the mutant D365A of Pedobacter saltans GH31 alpha-galactosidase [Pseudopedobacter saltans],4XPS_A Crystal structure of the mutant D365A of Pedobacter saltans GH31 alpha-galactosidase complexed with p-nitrophenyl-alpha-galactopyranoside [Pseudopedobacter saltans]

Crystalstructure of Family 31 alpha-glucosidase (BT_0339) from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482],5F7C_B Crystal structure of Family 31 alpha-glucosidase (BT_0339) from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482],5F7C_C Crystal structure of Family 31 alpha-glucosidase (BT_0339) from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482],5F7C_D Crystal structure of Family 31 alpha-glucosidase (BT_0339) from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482]

Structureof the YicI thiosugar Michaelis complex [Escherichia coli],2F2H_B Structure of the YicI thiosugar Michaelis complex [Escherichia coli],2F2H_C Structure of the YicI thiosugar Michaelis complex [Escherichia coli],2F2H_D Structure of the YicI thiosugar Michaelis complex [Escherichia coli],2F2H_E Structure of the YicI thiosugar Michaelis complex [Escherichia coli],2F2H_F Structure of the YicI thiosugar Michaelis complex [Escherichia coli]

Structureof a Family 31 alpha glycosidase [Escherichia coli],1XSI_B Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSI_C Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSI_D Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSI_E Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSI_F Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSJ_A Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSJ_B Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSJ_C Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSJ_D Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSJ_E Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSJ_F Structure of a Family 31 alpha glycosidase [Escherichia coli],1XSK_A Structure of a Family 31 alpha glycosidase glycosyl-enzyme intermediate [Escherichia coli],1XSK_B Structure of a Family 31 alpha glycosidase glycosyl-enzyme intermediate [Escherichia coli],1XSK_C Structure of a Family 31 alpha glycosidase glycosyl-enzyme intermediate [Escherichia coli],1XSK_D Structure of a Family 31 alpha glycosidase glycosyl-enzyme intermediate [Escherichia coli],1XSK_E Structure of a Family 31 alpha glycosidase glycosyl-enzyme intermediate [Escherichia coli],1XSK_F Structure of a Family 31 alpha glycosidase glycosyl-enzyme intermediate [Escherichia coli]

Alpha-glucosidase 2 OS=Bacillus thermoamyloliquefaciens OX=1425 PE=3 SV=1

Alpha-xylosidase OS=Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2) OX=273057 GN=xylS PE=1 SV=1

Alpha-xylosidase OS=Escherichia coli (strain K12) OX=83333 GN=yicI PE=1 SV=2

Alpha-glucosidase OS=Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2) OX=273057 GN=malA PE=1 SV=1

Alpha-glucosidase OS=Saccharolobus solfataricus (strain 98/2) OX=555311 GN=malA PE=1 SV=1