1,4-alpha-glucan branching protein GlgB.

glycogen branching enzyme; Provisional

1,4-alpha-glucan branching protein GlgB.

Alpha amylase catalytic domain found in the Glycogen branching enzyme (also called 1,4-alpha-glucan branching enzyme). The glycogen branching enzyme catalyzes the third step of glycogen biosynthesis by the cleavage of an alpha-(1,4)-glucosidic linkage and the formation a new alpha-(1,6)-branch by subsequent transfer of cleaved oligosaccharide. They are part of a group called branching enzymes which catalyze the formation of alpha-1,6 branch points in either glycogen or starch. This group includes proteins from bacteria, eukaryotes, and archaea. 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.

1,4-alpha-glucan branching enzyme [Carbohydrate transport and metabolism].

TheX-ray Crystallographic Structure of Branching Enzyme [Escherichia coli],1M7X_B The X-ray Crystallographic Structure of Branching Enzyme [Escherichia coli],1M7X_C The X-ray Crystallographic Structure of Branching Enzyme [Escherichia coli],1M7X_D The X-ray Crystallographic Structure of Branching Enzyme [Escherichia coli]

CrystalStructure of E.Coli Branching Enzyme in complex with maltoheptaose [Escherichia coli],4LPC_B Crystal Structure of E.Coli Branching Enzyme in complex with maltoheptaose [Escherichia coli],4LPC_C Crystal Structure of E.Coli Branching Enzyme in complex with maltoheptaose [Escherichia coli],4LPC_D Crystal Structure of E.Coli Branching Enzyme in complex with maltoheptaose [Escherichia coli],4LQ1_A Crystal Structure of E.Coli Branching Enzyme in complex with maltohexaose [Escherichia coli],4LQ1_B Crystal Structure of E.Coli Branching Enzyme in complex with maltohexaose [Escherichia coli],4LQ1_C Crystal Structure of E.Coli Branching Enzyme in complex with maltohexaose [Escherichia coli],4LQ1_D Crystal Structure of E.Coli Branching Enzyme in complex with maltohexaose [Escherichia coli],5E6Y_A Crystal structure of E.Coli branching enzyme in complex with alpha cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E6Y_B Crystal structure of E.Coli branching enzyme in complex with alpha cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E6Y_C Crystal structure of E.Coli branching enzyme in complex with alpha cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E6Y_D Crystal structure of E.Coli branching enzyme in complex with alpha cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E6Z_A Crystal structure of Ecoli Branching Enzyme with beta cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E6Z_B Crystal structure of Ecoli Branching Enzyme with beta cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E6Z_C Crystal structure of Ecoli Branching Enzyme with beta cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E6Z_D Crystal structure of Ecoli Branching Enzyme with beta cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E70_A Crystal structure of Ecoli Branching Enzyme with gamma cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E70_B Crystal structure of Ecoli Branching Enzyme with gamma cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E70_C Crystal structure of Ecoli Branching Enzyme with gamma cyclodextrin [Escherichia coli O139:H28 str. E24377A],5E70_D Crystal structure of Ecoli Branching Enzyme with gamma cyclodextrin [Escherichia coli O139:H28 str. E24377A]

Crystalstructure of branching enzyme W610N mutant from Cyanothece sp. ATCC 51142 [Crocosphaera subtropica ATCC 51142],5GQX_A Crystal structure of branching enzyme W610N mutant from Cyanothece sp. ATCC 51142 in complex with maltoheptaose [Crocosphaera subtropica ATCC 51142]

Crystalstructure of branching enzyme Y500A/D501A mutant from Cyanothece sp. ATCC 51142 in complex with maltoheptaose [Crocosphaera subtropica ATCC 51142],5GR6_A Crystal structure of branching enzyme Y500A/D501A double mutant from Cyanothece sp. ATCC 51142 [Crocosphaera subtropica ATCC 51142]

Crystalstructure of branching enzyme Y500A mutant from Cyanothece sp. ATCC 51142 [Crocosphaera subtropica ATCC 51142]

1,4-alpha-glucan branching enzyme GlgB OS=Shigella dysenteriae serotype 1 (strain Sd197) OX=300267 GN=glgB PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB OS=Salmonella paratyphi A (strain ATCC 9150 / SARB42) OX=295319 GN=glgB PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB OS=Salmonella choleraesuis (strain SC-B67) OX=321314 GN=glgB PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB OS=Shigella sonnei (strain Ss046) OX=300269 GN=glgB PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB OS=Pectobacterium atrosepticum (strain SCRI 1043 / ATCC BAA-672) OX=218491 GN=glgB PE=3 SV=1