glycosyl hydrolase family 36 (GH36). GH36 enzymes occur in prokaryotes, eukaryotes, and archaea with a wide range of hydrolytic activities, including alpha-galactosidase, alpha-N-acetylgalactosaminidase, stachyose synthase, and raffinose synthase. All GH36 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. GH36 members 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.

Alpha-galactosidase [Carbohydrate transport and metabolism].

Glycoside hydrolases, clan D. This group of glycosyl hydrolase families is comprised of glycosyl hydrolase family 31 (GH31), family 36 (GH36), and family 27 (GH27). These structurally and mechanistically related protein families 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. They have a wide range of functions including alpha-glucosidase, alpha-xylosidase, 6-alpha-glucosyltransferase, 3-alpha-isomaltosyltransferase, alpha-N-acetylgalactosaminidase, stachyose synthase, raffinose synthase, and alpha-1,4-glucan lyase.

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.

glycosyl hydrolase family 27 (GH27). GH27 enzymes occur in eukaryotes, prokaryotes, and archaea with a wide range of hydrolytic activities, including alpha-glucosidase (glucoamylase and sucrase-isomaltase), alpha-N-acetylgalactosaminidase, and 3-alpha-isomalto-dextranase. All GH27 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. GH27 members 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.

TtGalA,alpha-galactosidase from Thermus thermopilus in apo form [Thermus thermophilus HB8],6LCJ_B TtGalA, alpha-galactosidase from Thermus thermopilus in apo form [Thermus thermophilus HB8],6LCJ_C TtGalA, alpha-galactosidase from Thermus thermopilus in apo form [Thermus thermophilus HB8],6LCJ_D TtGalA, alpha-galactosidase from Thermus thermopilus in apo form [Thermus thermophilus HB8],6LCJ_E TtGalA, alpha-galactosidase from Thermus thermopilus in apo form [Thermus thermophilus HB8],6LCJ_F TtGalA, alpha-galactosidase from Thermus thermopilus in apo form [Thermus thermophilus HB8],6LCK_A TtGalA, alpha-galactosidase from Thermus thermophilus in complex with p-nitrophenyl alpha-D-galactopyranoside (alpha-NPG) [Thermus thermophilus HB8],6LCK_B TtGalA, alpha-galactosidase from Thermus thermophilus in complex with p-nitrophenyl alpha-D-galactopyranoside (alpha-NPG) [Thermus thermophilus HB8],6LCK_C TtGalA, alpha-galactosidase from Thermus thermophilus in complex with p-nitrophenyl alpha-D-galactopyranoside (alpha-NPG) [Thermus thermophilus HB8],6LCL_A TtGalA, alpha-galactosidase from Thermus thermophilus in complex with stachyose [Thermus thermophilus HB8],6LCL_C TtGalA, alpha-galactosidase from Thermus thermophilus in complex with stachyose [Thermus thermophilus HB8],6LCL_E TtGalA, alpha-galactosidase from Thermus thermophilus in complex with stachyose [Thermus thermophilus HB8]

Structureof apo structure of GH36 alpha-galactosidase from Thermotoga maritima [Thermotoga maritima],5M12_A Structure of GH36 alpha-galactosidase from Thermotoga maritima in complex with intact cyclopropyl-carbasugar. [Thermotoga maritima],5M16_A Structure of GH36 alpha-galactosidase from Thermotoga maritima in complex with a hydrolysed cyclopropyl carbasugar. [Thermotoga maritima],5M1I_A Structure of GH36 alpha-galactosidase from Thermotoga maritima in a covalent complex with a cyclopropyl carbasugar. [Thermotoga maritima],6GVD_A Alpha-galactosidase from Thermotoga maritima in complex with cyclohexene-based carbasugar mimic of galactose [Thermotoga maritima MSB8],6GWG_A Alpha-galactosidase from Thermotoga maritima in complex with cyclohexene-based carbasugar mimic of galactose covalently linked to the nucleophile [Thermotoga maritima MSB8],6GX8_A Alpha-galactosidase from Thermotoga maritima in complex with hydrolysed cyclohexene-based carbasugar mimic of galactose [Thermotoga maritima MSB8]

Alpha-galactosidasemutant D378A from Thermotoga maritima in complex with intact cyclohexene-based carbasugar mimic of galactose with 3,5 difluorophenyl leaving group [Thermotoga maritima MSB8],6GWF_A Alpha-galactosidase mutant D387A from Thermotoga maritima in complex with intact cyclohexene-based carbasugar mimic of galactose with 2,4-dinitro leaving group [Thermotoga maritima MSB8]

Crystalstructure of Alpha-galactosidase (EC 3.2.1.22) (Melibiase) (tm1192) from Thermotoga maritima at 2.34 A resolution [Thermotoga maritima]

Crystalstructure of GH36 alpha-galactosidase AgaA from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4FNR_B Crystal structure of GH36 alpha-galactosidase AgaA from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4FNR_C Crystal structure of GH36 alpha-galactosidase AgaA from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4FNR_D Crystal structure of GH36 alpha-galactosidase AgaA from Geobacillus stearothermophilus [Geobacillus stearothermophilus]

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

Alpha-galactosidase AgaA OS=Geobacillus stearothermophilus OX=1422 GN=agaA PE=1 SV=1

Probable alpha-galactosidase G OS=Aspergillus terreus (strain NIH 2624 / FGSC A1156) OX=341663 GN=aglG PE=3 SV=1

Alpha-galactosidase OS=Escherichia coli OX=562 GN=rafA PE=1 SV=1

Probable alpha-galactosidase C OS=Aspergillus flavus (strain ATCC 200026 / FGSC A1120 / IAM 13836 / NRRL 3357 / JCM 12722 / SRRC 167) OX=332952 GN=aglC PE=3 SV=2