1,4-alpha-glucan branching protein GlgB.

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].

glycogen branching enzyme; Provisional

TheX-ray Crystallographic Structure of Branching Enzyme from Rhodothermus obamensis STB05 [Rhodothermus marinus]

Crystalstructure of glycogen branching enzyme synonym: 1,4-alpha-D-glucan:1,4-alpha-D-GLUCAN 6-glucosyl-transferase from mycobacterium tuberculosis H37RV [Mycobacterium tuberculosis H37Rv]

Crystalstructure of branching enzyme W610A mutant from Cyanothece sp. ATCC 51142 [Crocosphaera subtropica ATCC 51142]

ChainA, 1,4-alpha-glucan branching enzyme GlgB [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=Aquifex aeolicus (strain VF5) OX=224324 GN=glgB PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB OS=Halothermothrix orenii (strain H 168 / OCM 544 / DSM 9562) OX=373903 GN=glgB PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB OS=Rhodoferax ferrireducens (strain ATCC BAA-621 / DSM 15236 / T118) OX=338969 GN=glgB PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB 2 OS=Xanthomonas campestris pv. campestris (strain 8004) OX=314565 GN=glgB2 PE=3 SV=1

1,4-alpha-glucan branching enzyme GlgB 2 OS=Xanthomonas campestris pv. campestris (strain ATCC 33913 / DSM 3586 / NCPPB 528 / LMG 568 / P 25) OX=190485 GN=glgB2 PE=3 SV=1