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.

Melibiase. Glycoside hydrolase families GH27, GH31 and GH36 form the glycoside hydrolase clan GH-D. Glycoside hydrolase family 36 can be split into 11 families, GH36A to GH36K. This family includes enzymes from GH36A-B and GH36D-K and from GH27.

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.

Alpha galactosidase A.

SpAgawild type apo structure [Streptococcus pneumoniae TIGR4],6PHV_A Chain A, Alpha-galactosidase [Streptococcus pneumoniae TIGR4]

ChainA, Alpha-galactosidase [Streptococcus pneumoniae TIGR4],6PHX_A SpAga D472N structure in complex with raffinose [Streptococcus pneumoniae TIGR4],6PHY_A Chain A, Alpha-galactosidase [Streptococcus pneumoniae TIGR4],6PI0_A AgaD472N-Linear Blood group B type 2 trisaccharide complex structure [Streptococcus pneumoniae TIGR4]

galactosidasedomain of alpha-galactosidase-sucrose kinase, AgaSK [[Ruminococcus] gnavus E1],2YFO_A GALACTOSIDASE DOMAIN OF ALPHA-GALACTOSIDASE-SUCROSE KINASE, AGASK, in complex with galactose [[Ruminococcus] gnavus E1]

Crystalstructure of the glycoside hydrolase family 36 alpha-galactosidase from Paecilomyces thermophila [Paecilomyces sp. 'thermophila'],6JHP_B Crystal structure of the glycoside hydrolase family 36 alpha-galactosidase from Paecilomyces thermophila [Paecilomyces sp. 'thermophila'],6JHP_C Crystal structure of the glycoside hydrolase family 36 alpha-galactosidase from Paecilomyces thermophila [Paecilomyces sp. 'thermophila'],6JHP_D Crystal structure of the glycoside hydrolase family 36 alpha-galactosidase from Paecilomyces thermophila [Paecilomyces sp. 'thermophila']

Alpha-galactosidase 1 OS=Pediococcus pentosaceus OX=1255 GN=agaR PE=3 SV=1

Alpha-galactosidase OS=Streptococcus mutans serotype c (strain ATCC 700610 / UA159) OX=210007 GN=aga PE=3 SV=3

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

Bifunctional alpha-galactosidase/sucrose kinase AgaSK OS=Ruminococcus gnavus OX=33038 GN=agaSK PE=1 SV=1

Alpha-galactosidase C OS=Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139) OX=227321 GN=aglC PE=1 SV=1