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.

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.

Alpha-galactosidase [Carbohydrate transport and metabolism].

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.

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]

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]

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