Alpha amylase catalytic domain found in archaeal, bacterial, and plant 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 AmyA from bacteria, archaea, water fleas, and plants. 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

alpha-amylase

cytoplasmic alpha-amylase; Reviewed

alpha-amylase; Provisional

CrystalAnd Molecular Structure Of Barley Alpha-Amylase [Hordeum vulgare],1AVA_A Amy2BASI PROTEIN-Protein Complex From Barley Seed [Hordeum vulgare],1AVA_B Amy2BASI PROTEIN-Protein Complex From Barley Seed [Hordeum vulgare],1BG9_A Barley Alpha-Amylase With Substrate Analogue Acarbose [Hordeum vulgare]

Crystalstructure of alpha-amylase AmyI-1 from Oryza sativa [Oryza sativa Japonica Group],3WN6_B Crystal structure of alpha-amylase AmyI-1 from Oryza sativa [Oryza sativa Japonica Group],3WN6_C Crystal structure of alpha-amylase AmyI-1 from Oryza sativa [Oryza sativa Japonica Group],3WN6_D Crystal structure of alpha-amylase AmyI-1 from Oryza sativa [Oryza sativa Japonica Group]

ChainA, Alpha-amylase type A isozyme [Hordeum vulgare]

CrystalStructure At 1.5a Resolution Of The Barley Alpha- Amylase Isozyme 1 [Hordeum vulgare],1P6W_A Crystal structure of barley alpha-amylase isozyme 1 (AMY1) in complex with the substrate analogue, methyl 4I,4II,4III-tri-thiomaltotetraoside (thio-DP4) [Hordeum vulgare],1RPK_A Crystal structure of barley alpha-amylase isozyme 1 (amy1) in complex with acarbose [Hordeum vulgare]

ChainA, Alpha-amylase type A isozyme [Hordeum vulgare],2QPU_B Chain B, Alpha-amylase type A isozyme [Hordeum vulgare],2QPU_C Chain C, Alpha-amylase type A isozyme [Hordeum vulgare]

Alpha-amylase 1 OS=Arabidopsis thaliana OX=3702 GN=AMY1 PE=1 SV=1

Alpha-amylase AMY3 OS=Triticum aestivum OX=4565 GN=AMY1.1 PE=2 SV=1

Alpha-amylase type B isozyme OS=Hordeum vulgare OX=4513 GN=AMY1.2 PE=1 SV=3

Alpha-amylase OS=Oryza sativa subsp. japonica OX=39947 GN=AMY1.1 PE=1 SV=2

Alpha-amylase type B isozyme (Fragment) OS=Hordeum vulgare OX=4513 GN=AMY1.3 PE=2 SV=1