glycogen phosphorylase and similar proteins. This is a family of oligosaccharide phosphorylases. It includes yeast and mammalian glycogen phosphorylases, plant starch/glucan phosphorylase, as well as the maltodextrin phosphorylases of bacteria. The members of this family catalyze the breakdown of oligosaccharides into glucose-1-phosphate units. They are important allosteric enzymes in carbohydrate metabolism. The allosteric control mechanisms of yeast and mammalian members of this family are different from that of bacterial members. The members of this family belong to the GT-B structural superfamily of glycoslytransferases, which have characteristic N- and C-terminal domains each containing a typical Rossmann fold. The two domains have high structural homology despite minimal sequence homology. The large cleft that separates the two domains includes the catalytic center and permits a high degree of flexibility.

maltodextrin phosphorylase; Provisional

glycogen/starch/alpha-glucan phosphorylases. This family consists of phosphorylases. Members use phosphate to break alpha 1,4 linkages between pairs of glucose residues at the end of long glucose polymers, releasing alpha-D-glucose 1-phosphate. The nomenclature convention is to preface the name according to the natural substrate, as in glycogen phosphorylase, starch phosphorylase, maltodextrin phosphorylase, etc. Name differences among these substrates reflect differences in patterns of branching with alpha 1,6 linkages. Members include allosterically regulated and unregulated forms. A related family, TIGR02094, contains examples known to act well on particularly small alpha 1,4 glucans, as may be found after import from exogenous sources. [Energy metabolism, Biosynthesis and degradation of polysaccharides]

4-alpha-glucanotransferase; Provisional

Carbohydrate phosphorylase. The members of this family catalyze the formation of glucose 1-phosphate from one of the following polyglucoses; glycogen, starch, glucan or maltodextrin.

Crystalstructure of putative glycogen phosphorylase from Streptococcus mutans [Streptococcus mutans UA159]

ChainA, 4-alpha-glucanotransferase [Streptococcus agalactiae],6M6T_B Chain B, 4-alpha-glucanotransferase [Streptococcus agalactiae],6M6T_C Chain C, 4-alpha-glucanotransferase [Streptococcus agalactiae],6M6T_D Chain D, 4-alpha-glucanotransferase [Streptococcus agalactiae],6M6T_E Chain E, 4-alpha-glucanotransferase [Streptococcus agalactiae],6M6T_F Chain F, 4-alpha-glucanotransferase [Streptococcus agalactiae],6M6T_G Chain G, 4-alpha-glucanotransferase [Streptococcus agalactiae],6M6T_H Chain H, 4-alpha-glucanotransferase [Streptococcus agalactiae]

Crystallographicstudies on N-azido-beta-D-glucopyranosylamine, an inhibitor of glycogen phosphorylase: comparison with N-acetyl-beta-D-glucopyranosylamine [Oryctolagus cuniculus]

Humanliver glycogen phosphorylase (tense state) in complex with the allosteric inhibitor AVE5688 [Homo sapiens],3CEH_B Human liver glycogen phosphorylase (tense state) in complex with the allosteric inhibitor AVE5688 [Homo sapiens],3CEJ_A Human glycogen phosphorylase (tense state) in complex with the allosteric inhibitor AVE2865 [Homo sapiens],3CEJ_B Human glycogen phosphorylase (tense state) in complex with the allosteric inhibitor AVE2865 [Homo sapiens],3CEM_A Human glycogen phosphorylase (tense state) in complex with the allosteric inhibitor AVE9423 [Homo sapiens],3CEM_B Human glycogen phosphorylase (tense state) in complex with the allosteric inhibitor AVE9423 [Homo sapiens]

GlycogenPhosphorylase in complex with CK898 [Oryctolagus cuniculus]

Maltodextrin phosphorylase OS=Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4) OX=170187 GN=malP PE=3 SV=2

4-alpha-glucanotransferase OS=Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4) OX=170187 GN=malQ PE=3 SV=1

4-alpha-glucanotransferase OS=Streptococcus pneumoniae (strain ATCC BAA-255 / R6) OX=171101 GN=malQ PE=3 SV=1

Glycogen phosphorylase OS=Drosophila melanogaster OX=7227 GN=GlyP PE=2 SV=2

Glycogen phosphorylase OS=Bacillus subtilis (strain 168) OX=224308 GN=glgP PE=2 SV=1