1q9d: Difference between revisions
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==Fructose-1,6-bisphosphatase Complexed with a New Allosteric Site Inhibitor (I-State)== | ==Fructose-1,6-bisphosphatase Complexed with a New Allosteric Site Inhibitor (I-State)== | ||
<StructureSection load='1q9d' size='340' side='right' caption='[[1q9d]], [[Resolution|resolution]] 2.35Å' scene=''> | <StructureSection load='1q9d' size='340' side='right' caption='[[1q9d]], [[Resolution|resolution]] 2.35Å' scene=''> | ||
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=F6P:FRUCTOSE-6-PHOSPHATE'>F6P</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=OI1:3-(4-HYDROXYBENZYL)-2-[1-({[2-(4-HYDROXYPHENYL)ETHYL]AMINO}CARBONYL)BUTYL]-4-OXO-3,6,11,11A-TETRAHYDRO-4H-PYRAZINO[1,2-B]ISOQUINOLIN-2-IUM-1-OLATE'>OI1</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=F6P:FRUCTOSE-6-PHOSPHATE'>F6P</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=OI1:3-(4-HYDROXYBENZYL)-2-[1-({[2-(4-HYDROXYPHENYL)ETHYL]AMINO}CARBONYL)BUTYL]-4-OXO-3,6,11,11A-TETRAHYDRO-4H-PYRAZINO[1,2-B]ISOQUINOLIN-2-IUM-1-OLATE'>OI1</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Fructose-bisphosphatase Fructose-bisphosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.11 3.1.3.11] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Fructose-bisphosphatase Fructose-bisphosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.11 3.1.3.11] </span></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1q9d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q9d OCA], [http://pdbe.org/1q9d PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q9d RCSB], [http://www.ebi.ac.uk/pdbsum/1q9d PDBsum]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1q9d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q9d OCA], [http://pdbe.org/1q9d PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q9d RCSB], [http://www.ebi.ac.uk/pdbsum/1q9d PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1q9d ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
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</div> | </div> | ||
<div class="pdbe-citations 1q9d" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 1q9d" style="background-color:#fffaf0;"></div> | ||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 18:52, 12 October 2017
Fructose-1,6-bisphosphatase Complexed with a New Allosteric Site Inhibitor (I-State)Fructose-1,6-bisphosphatase Complexed with a New Allosteric Site Inhibitor (I-State)
Structural highlights
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 PubMedA highly constrained pseudo-tetrapeptide (OC252-324) further defines a new allosteric binding site located near the center of fructose-1,6-bisphosphatase. In a crystal structure, pairs of inhibitory molecules bind to opposite faces of the enzyme tetramer. Each ligand molecule is in contact with three of four subunits of the tetramer, hydrogen bonding with the side chain of Asp187 and the backbone carbonyl of residue 71, and electrostatically interacting with the backbone carbonyl of residue 51. The ligated complex adopts a quaternary structure between the canonical R- and T-states of fructose-1,6-bisphosphatase, and yet a dynamic loop essential for catalysis (residues 52-72) is in a conformation identical to that of the T-state enzyme. Inhibition by the pseudo-tetrapeptide is cooperative (Hill coefficient of 2), synergistic with both AMP and fructose 2,6-bisphosphate, noncompetitive with respect to Mg2+, and uncompetitive with respect to fructose 1,6-bisphosphate. The ligand dramatically lowers the concentration at which substrate inhibition dominates the kinetics of fructose-1,6-bisphosphatase. Elevated substrate concentrations employed in kinetic screens may have facilitated the discovery of this uncompetitive inhibitor. Moreover, the inhibitor could mimic an unknown natural effector of fructose-1,6-bisphosphatase, as it interacts strongly with a conserved residue of undetermined functional significance. Inhibition of fructose-1,6-bisphosphatase by a new class of allosteric effectors.,Choe JY, Nelson SW, Arienti KL, Axe FU, Collins TL, Jones TK, Kimmich RD, Newman MJ, Norvell K, Ripka WC, Romano SJ, Short KM, Slee DH, Fromm HJ, Honzatko RB J Biol Chem. 2003 Dec 19;278(51):51176-83. Epub 2003 Oct 6. PMID:14530289[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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