Alpha amylase catalytic domain found in an uncharacterized protein family. The Alpha-amylase family comprises the largest family of glycoside hydrolases (GH), with the majority of enzymes acting on starch, glycogen, and related oligo- and polysaccharides. These proteins catalyze the transformation of alpha-1,4 and alpha-1,6 glucosidic linkages with retention of the anomeric center. The protein is described as having 3 domains: A, B, C. A is a (beta/alpha) 8-barrel; B is a loop between the beta 3 strand and alpha 3 helix of A; C is the C-terminal extension characterized by a Greek key. The majority of the enzymes have an active site cleft found between domains A and B where a triad of catalytic residues (Asp, Glu and Asp) performs catalysis. Other members of this family have lost the catalytic activity as in the case of the human 4F2hc, or only have 2 residues that serve as the catalytic nucleophile and the acid/base, such as Thermus A4 beta-galactosidase with 2 Glu residues (GH42) and human alpha-galactosidase with 2 Asp residues (GH31). The family members are quite extensive and include: alpha amylase, maltosyltransferase, cyclodextrin glycotransferase, maltogenic amylase, neopullulanase, isoamylase, 1,4-alpha-D-glucan maltotetrahydrolase, 4-alpha-glucotransferase, oligo-1,6-glucosidase, amylosucrase, sucrose phosphorylase, and amylomaltase.

Alpha amylase catalytic domain found in archaeal and bacterial Alpha-amylases (also called 1,4-alpha-D-glucan-4-glucanohydrolase). AmyA (EC 3.2.1.1) catalyzes the hydrolysis of alpha-(1,4) glycosidic linkages of glycogen, starch, related polysaccharides, and some oligosaccharides. This group includes firmicutes, bacteroidetes, and proteobacteria. The Alpha-amylase family comprises the largest family of glycoside hydrolases (GH), with the majority of enzymes acting on starch, glycogen, and related oligo- and polysaccharides. These proteins catalyze the transformation of alpha-1,4 and alpha-1,6 glucosidic linkages with retention of the anomeric center. The protein is described as having 3 domains: A, B, C. A is a (beta/alpha) 8-barrel; B is a loop between the beta 3 strand and alpha 3 helix of A; C is the C-terminal extension characterized by a Greek key. The majority of the enzymes have an active site cleft found between domains A and B where a triad of catalytic residues (Asp, Glu and Asp) performs catalysis. Other members of this family have lost the catalytic activity as in the case of the human 4F2hc, or only have 2 residues that serve as the catalytic nucleophile and the acid/base, such as Thermus A4 beta-galactosidase with 2 Glu residues (GH42) and human alpha-galactosidase with 2 Asp residues (GH31). The family members are quite extensive and include: alpha amylase, maltosyltransferase, cyclodextrin glycotransferase, maltogenic amylase, neopullulanase, isoamylase, 1,4-alpha-D-glucan maltotetrahydrolase, 4-alpha-glucotransferase, oligo-1,6-glucosidase, amylosucrase, sucrose phosphorylase, and amylomaltase.

Alpha amylase catalytic domain found in an uncharacterized protein family. The Alpha-amylase family comprises the largest family of glycoside hydrolases (GH), with the majority of enzymes acting on starch, glycogen, and related oligo- and polysaccharides. These proteins catalyze the transformation of alpha-1,4 and alpha-1,6 glucosidic linkages with retention of the anomeric center. The protein is described as having 3 domains: A, B, C. A is a (beta/alpha) 8-barrel; B is a loop between the beta 3 strand and alpha 3 helix of A; C is the C-terminal extension characterized by a Greek key. The majority of the enzymes have an active site cleft found between domains A and B where a triad of catalytic residues (Asp, Glu and Asp) performs catalysis. Other members of this family have lost the catalytic activity as in the case of the human 4F2hc, or only have 2 residues that serve as the catalytic nucleophile and the acid/base, such as Thermus A4 beta-galactosidase with 2 Glu residues (GH42) and human alpha-galactosidase with 2 Asp residues (GH31). The family members are quite extensive and include: alpha amylase, maltosyltransferase, cyclodextrin glycotransferase, maltogenic amylase, neopullulanase, isoamylase, 1,4-alpha-D-glucan maltotetrahydrolase, 4-alpha-glucotransferase, oligo-1,6-glucosidase, amylosucrase, sucrose phosphorylase, and amylomaltase.

Glycosidase [Carbohydrate transport and metabolism].

Alpha amylase, catalytic domain. Alpha amylase is classified as family 13 of the glycosyl hydrolases. The structure is an 8 stranded alpha/beta barrel containing the active site, interrupted by a ~70 a.a. calcium-binding domain protruding between beta strand 3 and alpha helix 3, and a carboxyl-terminal Greek key beta-barrel domain.

Crystalstructure of an alpha-amylase from Lactobacillus plantarum [Lactiplantibacillus plantarum],3DHU_B Crystal structure of an alpha-amylase from Lactobacillus plantarum [Lactiplantibacillus plantarum],3DHU_C Crystal structure of an alpha-amylase from Lactobacillus plantarum [Lactiplantibacillus plantarum],3DHU_D Crystal structure of an alpha-amylase from Lactobacillus plantarum [Lactiplantibacillus plantarum]

Crystalstructure of a noncanonic maltogenic alpha-amylase AmyB from Thermotoga neapolitana [Thermotoga neapolitana],4GKL_B Crystal structure of a noncanonic maltogenic alpha-amylase AmyB from Thermotoga neapolitana [Thermotoga neapolitana]

Bombyxmori GH13 sucrose hydrolase [Bombyx mori],6LGA_B Bombyx mori GH13 sucrose hydrolase [Bombyx mori],6LGB_A Bombyx mori GH13 sucrose hydrolase complexed with glucose [Bombyx mori],6LGB_B Bombyx mori GH13 sucrose hydrolase complexed with glucose [Bombyx mori],6LGC_A Bombyx mori GH13 sucrose hydrolase complexed with 1-deoxynojirimycin [Bombyx mori],6LGC_B Bombyx mori GH13 sucrose hydrolase complexed with 1-deoxynojirimycin [Bombyx mori],6LGD_A Bombyx mori GH13 sucrose hydrolase complexed with 1,4-dideoxy-1,4-imino-D-arabinitol [Bombyx mori],6LGD_B Bombyx mori GH13 sucrose hydrolase complexed with 1,4-dideoxy-1,4-imino-D-arabinitol [Bombyx mori],6LGE_A Bombyx mori GH13 sucrose hydrolase complexed with acarbose [Bombyx mori],6LGE_B Bombyx mori GH13 sucrose hydrolase complexed with acarbose [Bombyx mori]

Bombyxmori GH13 sucrose hydrolase mutant E322Q complexed with sucrose [Bombyx mori],6LGG_B Bombyx mori GH13 sucrose hydrolase mutant E322Q complexed with sucrose [Bombyx mori],6LGH_A Bombyx mori GH13 sucrose hydrolase mutant E322Q covalent intermediate [Bombyx mori],6LGH_B Bombyx mori GH13 sucrose hydrolase mutant E322Q covalent intermediate [Bombyx mori],6LGI_A Bombyx mori GH13 sucrose hydrolase mutant E322Q covalent intermediate complexed with fructose [Bombyx mori],6LGI_B Bombyx mori GH13 sucrose hydrolase mutant E322Q covalent intermediate complexed with fructose [Bombyx mori]

Bombyxmori GH13 sucrose hydrolase mutant D247N complexed with sucrose [Bombyx mori],6LGF_B Bombyx mori GH13 sucrose hydrolase mutant D247N complexed with sucrose [Bombyx mori]

Alpha-amylase 3 OS=Dictyoglomus thermophilum (strain ATCC 35947 / DSM 3960 / H-6-12) OX=309799 GN=amyC PE=3 SV=2

Probable alpha-glucosidase OS=Rhizobium meliloti (strain 1021) OX=266834 GN=aglA PE=3 SV=2

Trehalose-6-phosphate hydrolase OS=Bacillus subtilis (strain 168) OX=224308 GN=treA PE=1 SV=2

Neopullulanase OS=Geobacillus stearothermophilus OX=1422 GN=nplT PE=1 SV=1

Maltase 1 OS=Drosophila virilis OX=7244 GN=Mal-B1 PE=3 SV=2