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.

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.

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]

Glucan phosphorylase [Carbohydrate transport and metabolism].

maltodextrin phosphorylase; Provisional

Starchphosphorylase: structural studies explain oxyanion-dependent kinetic stability and regulatory control. [Corynebacterium callunae],2C4M_B Starch phosphorylase: structural studies explain oxyanion-dependent kinetic stability and regulatory control. [Corynebacterium callunae],2C4M_C Starch phosphorylase: structural studies explain oxyanion-dependent kinetic stability and regulatory control. [Corynebacterium callunae],2C4M_D Starch phosphorylase: structural studies explain oxyanion-dependent kinetic stability and regulatory control. [Corynebacterium callunae]

Crystalstructure of human brain glycogen phosphorylase [Homo sapiens],5IKP_A Crystal structure of human brain glycogen phosphorylase bound to AMP [Homo sapiens]

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]

HUMANLIVER GLYCOGEN PHOSPHORYLASE A COMPLEXED WITH AMP [Homo sapiens]

HumanLiver Glycogen Phosphorylase A complexed with Chloroindoloyl glycine amide [Homo sapiens],1XOI_B Human Liver Glycogen Phosphorylase A complexed with Chloroindoloyl glycine amide [Homo sapiens]

Glycogen phosphorylase OS=Chlamydia pneumoniae OX=83558 GN=glgP PE=3 SV=1

Glycogen phosphorylase OS=Chlamydia trachomatis (strain D/UW-3/Cx) OX=272561 GN=glgP PE=3 SV=1

Glycogen phosphorylase OS=Chlamydia muridarum (strain MoPn / Nigg) OX=243161 GN=glgP PE=3 SV=1

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

Glycogen phosphorylase, brain form OS=Homo sapiens OX=9606 GN=PYGB PE=1 SV=5