1k3c

Phosphoenolpyruvate carboxykinase in complex with ADP, AlF3 and Pyruvate

spinqualitylabelsall models 1k3c, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1k3c is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: ADP, AF3, MG, PYR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PCKA_ECOLI 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 The mechanism of reversible transfer of the gamma-phosphate group of ATP by Escherichia coli phosphoenolpyruvate carboxykinase (PCK) on to its substrate is of great interest. It is known that metallofluorides are accurate analogs of the transition state in the context of kinase mechanisms. Therefore, two complexes of PCK, one with AlF(3), Mg(2+) and ADP (complex I), the other with AlF(3), Mg(2+), ADP and pyruvate (complex II) were crystallized. The X-ray crystal structures of these two complexes were determined at 2.0 A resolution. The Al atom has trigonal bipyramidal geometry that mimics the transition state of phosphoryl transfer. The Al atom is at a distance of 2.8 A and 2.9 A from an oxygen atom of the beta-phosphoryl group of ADP in complex I and II, respectively. A water molecule in complex I and an oxygen atom of the pyruvate in complex II are located along the axis of the trigonal bipyramid on the side opposite to the beta-phosphoryl oxygen with respect to the equatorial plane, suggesting that the complexes are close mimics of the transition state. Along with the presence of positively charged species around the AlF(3) moiety, these results indicate that phosphoryl transfer occurs via a direct displacement mechanism with associative qualities. The phosphoryl-transfer mechanism of Escherichia coli phosphoenolpyruvate carboxykinase from the use of AlF(3).,Sudom AM, Prasad L, Goldie H, Delbaere LT J Mol Biol. 2001 Nov 16;314(1):83-92. PMID:11724534 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phosphoenolpyruvate carboxykinase 3D structures

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