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.

alpha-galactosidase

alpha-galactosidase

alpha-galactosidase

Alpha galactosidase A.

Crystalstructure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NX0_B Crystal structure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NX0_C Crystal structure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NX0_D Crystal structure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NX0_E Crystal structure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NX0_F Crystal structure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NX0_G Crystal structure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NX0_H Crystal structure of Abp-WT, a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus]

Crystalstructure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NXK_B Crystal structure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NXK_C Crystal structure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NXK_D Crystal structure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NXK_E Crystal structure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NXK_F Crystal structure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NXK_G Crystal structure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NXK_H Crystal structure of Abp-D197A, a catalytic mutant of a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus [Geobacillus stearothermophilus],4NZF_A Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus],4NZF_B Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus],4NZF_C Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus],4NZF_D Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus],4NZF_E Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus],4NZF_F Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus],4NZF_G Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus],4NZF_H Crystal structure of Abp-D197A (a GH27-b-L-arabinopyranosidase from Geobacillus stearothermophilus), in complex with arabinose [Geobacillus stearothermophilus]

ChainA, alpha-galactosidase [Oryza sativa]

ChainA, Putative alpha-N-acetylgalactosaminidase [Halalkalibacterium halodurans C-125],3CC1_B Chain B, Putative alpha-N-acetylgalactosaminidase [Halalkalibacterium halodurans C-125]

Crystalstructure of alpha-galactosidase I from Mortierella vinacea [Umbelopsis vinacea]

Alpha-galactosidase OS=Cyamopsis tetragonoloba OX=3832 PE=1 SV=1

Alpha-galactosidase 2 OS=Arabidopsis thaliana OX=3702 GN=AGAL2 PE=1 SV=1

Alpha-galactosidase 3 OS=Arabidopsis thaliana OX=3702 GN=AGAL3 PE=1 SV=1

Alpha-galactosidase OS=Oryza sativa subsp. japonica OX=39947 GN=Os10g0493600 PE=1 SV=1

Cell surface glycoprotein 2 OS=Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372) OX=203119 GN=Cthe_3079 PE=1 SV=1