2rk8: Difference between revisions
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|PDB= 2rk8 |SIZE=350|CAPTION= <scene name='initialview01'>2rk8</scene>, resolution 2.000Å | |PDB= 2rk8 |SIZE=350|CAPTION= <scene name='initialview01'>2rk8</scene>, resolution 2.000Å | ||
|SITE= <scene name='pdbsite=AC1:Mn+Binding+Site+For+Residue+A+700'>AC1</scene>, <scene name='pdbsite=AC2:Na+Binding+Site+For+Residue+A+624'>AC2</scene>, <scene name='pdbsite=AC3:Mn+Binding+Site+For+Residue+B+700'>AC3</scene>, <scene name='pdbsite=AC4:Na+Binding+Site+For+Residue+B+624'>AC4</scene>, <scene name='pdbsite=AC5:Ppf+Binding+Site+For+Residue+A+3969'>AC5</scene>, <scene name='pdbsite=AC6:Ppf+Binding+Site+For+Residue+B+3969'>AC6</scene>, <scene name='pdbsite=AC7:Fmt+Binding+Site+For+Residue+A+3406'>AC7</scene>, <scene name='pdbsite=AC8:Peg+Binding+Site+For+Residue+A+5759'>AC8</scene> and <scene name='pdbsite=AC9:Fmt+Binding+Site+For+Residue+B+3406'>AC9</scene> | |SITE= <scene name='pdbsite=AC1:Mn+Binding+Site+For+Residue+A+700'>AC1</scene>, <scene name='pdbsite=AC2:Na+Binding+Site+For+Residue+A+624'>AC2</scene>, <scene name='pdbsite=AC3:Mn+Binding+Site+For+Residue+B+700'>AC3</scene>, <scene name='pdbsite=AC4:Na+Binding+Site+For+Residue+B+624'>AC4</scene>, <scene name='pdbsite=AC5:Ppf+Binding+Site+For+Residue+A+3969'>AC5</scene>, <scene name='pdbsite=AC6:Ppf+Binding+Site+For+Residue+B+3969'>AC6</scene>, <scene name='pdbsite=AC7:Fmt+Binding+Site+For+Residue+A+3406'>AC7</scene>, <scene name='pdbsite=AC8:Peg+Binding+Site+For+Residue+A+5759'>AC8</scene> and <scene name='pdbsite=AC9:Fmt+Binding+Site+For+Residue+B+3406'>AC9</scene> | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=PPF:PHOSPHONOFORMIC+ACID'>PPF</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/Phosphoenolpyruvate_carboxykinase_(GTP) Phosphoenolpyruvate carboxykinase (GTP)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.32 4.1.1.32] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Phosphoenolpyruvate_carboxykinase_(GTP) Phosphoenolpyruvate carboxykinase (GTP)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.32 4.1.1.32] </span> | ||
|GENE= Pck1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Rattus norvegicus]) | |GENE= Pck1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Rattus norvegicus]) | ||
|DOMAIN= | |||
|RELATEDENTRY=[[2rk7|2RK7]], [[2rka|2RKA]], [[2rkd|2RKD]], [[2rke|2RKE]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2rk8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2rk8 OCA], [http://www.ebi.ac.uk/pdbsum/2rk8 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2rk8 RCSB]</span> | |||
}} | }} | ||
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[[Category: Stiffin, R M.]] | [[Category: Stiffin, R M.]] | ||
[[Category: Sullivan, S M.]] | [[Category: Sullivan, S M.]] | ||
[[Category: cytoplasm]] | [[Category: cytoplasm]] | ||
[[Category: decarboxylase]] | [[Category: decarboxylase]] | ||
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[[Category: nucleotide-binding]] | [[Category: nucleotide-binding]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 05:01:22 2008'' | ||
Revision as of 05:01, 31 March 2008
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| , resolution 2.000Å | |||||||
|---|---|---|---|---|---|---|---|
| Sites: | , , , , , , , and | ||||||
| Ligands: | , , , , | ||||||
| Gene: | Pck1 (Rattus norvegicus) | ||||||
| Activity: | Phosphoenolpyruvate carboxykinase (GTP), with EC number 4.1.1.32 | ||||||
| Related: | 2RK7, 2RKA, 2RKD, 2RKE
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
The Structure of rat cytosolic PEPCK in complex with phosphonoformate
OverviewOverview
The mechanisms of molecular recognition of phosphoenolpyruvate (PEP) and oxaloacetate (OAA) by cytosolic phosphoenolpyruvate carboxykinase (cPEPCK) were investigated by the systematic evaluation of a variety of PEP and OAA analogues as potential reversible inhibitors of the enzyme against PEP. The molecules that inhibit the enzyme in a competitive fashion were found to fall into two general classes. Those molecules that mimic the binding geometry of PEP, namely phosphoglycolate and 3-phosphonopropionate, are found to bind weakly (millimolar Ki values). In contrast, those competitive inhibitors that mimic the binding of OAA (oxalate and phosphonoformate) coordinate directly to the active site manganese ion and bind an order of magnitude more tightly (micromolar Ki values). The competitive inhibitor sulfoacetate is found to be an outlier of these two classes, binding in a hybrid fashion utilizing modes of recognition of both PEP and OAA in order to achieve a micromolar inhibition constant in the absence of direct coordination to the active site metal. The kinetic studies in combination with the structural characterization of the five aforementioned competitive inhibitors demonstrate the molecular requirements for high affinity binding of molecules to the active site of the enzyme. These features include cis-planar carbonyl groups that are required for coordination to the active site metal, a bridging electron rich atom at the position corresponding to the C2 methylene group of OAA to facilitate interactions with R405, a carboxylate or sulfonate moiety at a position corresponding to the C1 carboxylate of OAA, and the edge-on aromatic interaction between a carboxylate and Y235.
About this StructureAbout this Structure
2RK8 is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
ReferenceReference
Differential Inhibition of Cytosolic PEPCK by Substrate Analogues. Kinetic and Structural Characterization of Inhibitor Recognition., Stiffin RM, Sullivan SM, Carlson GM, Holyoak T, Biochemistry. 2008 Feb 19;47(7):2099-109. Epub 2008 Jan 16. PMID:18197707
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