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| | == Structural highlights == | | == Structural highlights == |
| | <table><tr><td colspan='2'>[[1p2b]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P2B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1P2B FirstGlance]. <br> | | <table><tr><td colspan='2'>[[1p2b]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P2B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1P2B FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1p29|1p29]], [[1p2d|1p2d]], [[1p2g|1p2g]]</div></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene>, <scene name='pdbligand=PRD_900030:alpha-maltopentaose'>PRD_900030</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Phosphorylase Phosphorylase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.1.1 2.4.1.1] </span></td></tr>
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| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1p2b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1p2b OCA], [https://pdbe.org/1p2b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1p2b RCSB], [https://www.ebi.ac.uk/pdbsum/1p2b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1p2b ProSAT]</span></td></tr> | | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1p2b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1p2b OCA], [https://pdbe.org/1p2b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1p2b RCSB], [https://www.ebi.ac.uk/pdbsum/1p2b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1p2b ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/PYGM_RABIT PYGM_RABIT]] Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties.
| + | [https://www.uniprot.org/uniprot/PYGM_RABIT PYGM_RABIT] Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| | [[Category: Oryctolagus cuniculus]] | | [[Category: Oryctolagus cuniculus]] |
| - | [[Category: Phosphorylase]]
| + | [[Category: Chrysina ED]] |
| - | [[Category: Chrysina, E D]] | + | [[Category: Leonidas DD]] |
| - | [[Category: Leonidas, D D]] | + | [[Category: Mavridis IM]] |
| - | [[Category: Mavridis, I M]] | + | [[Category: Oikonomakos NG]] |
| - | [[Category: Oikonomakos, N G]] | + | [[Category: Pinotsis N]] |
| - | [[Category: Pinotsis, N]] | + | |
| - | [[Category: Transferase]]
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| Structural highlights
Function
PYGM_RABIT Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
A number of regulatory binding sites of glycogen phosphorylase (GP), such as the catalytic, the inhibitor, and the new allosteric sites are currently under investigation as targets for inhibition of hepatic glycogenolysis under high glucose concentrations; in some cases specific inhibitors are under evaluation in human clinical trials for therapeutic intervention in type 2 diabetes. In an attempt to investigate whether the storage site can be exploited as target for modulating hepatic glucose production, alpha-, beta-, and gamma-cyclodextrins were identified as moderate mixed-type competitive inhibitors of GPb (with respect to glycogen) with K(i) values of 47.1, 14.1, and 7.4 mM, respectively. To elucidate the structural basis of inhibition, we determined the structure of GPb complexed with beta- and gamma-cyclodextrins at 1.94 A and 2.3 A resolution, respectively. The structures of the two complexes reveal that the inhibitors can be accommodated in the glycogen storage site of T-state GPb with very little change of the tertiary structure and provide a basis for understanding their potency and subsite specificity. Structural comparisons of the two complexes with GPb in complex with either maltopentaose (G5) or maltoheptaose (G7) show that beta- and gamma-cyclodextrins bind in a mode analogous to the G5 and G7 binding with only some differences imposed by their cyclic conformations. It appears that the binding energy for stabilization of enzyme complexes derives from hydrogen bonding and van der Waals contacts to protein residues. The binding of alpha-cyclodextrin and octakis (2,3,6-tri-O-methyl)-gamma-cyclodextrin was also investigated, but none of them was bound in the crystal; moreover, the latter did not inhibit the phosphorylase reaction.
The binding of beta- and gamma-cyclodextrins to glycogen phosphorylase b: kinetic and crystallographic studies.,Pinotsis N, Leonidas DD, Chrysina ED, Oikonomakos NG, Mavridis IM Protein Sci. 2003 Sep;12(9):1914-24. PMID:12930991[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Pinotsis N, Leonidas DD, Chrysina ED, Oikonomakos NG, Mavridis IM. The binding of beta- and gamma-cyclodextrins to glycogen phosphorylase b: kinetic and crystallographic studies. Protein Sci. 2003 Sep;12(9):1914-24. PMID:12930991
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