1q9d

Fructose-1,6-bisphosphatase Complexed with a New Allosteric Site Inhibitor (I-State)

spinqualitylabelsall models 1q9d, resolution 2.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1q9d is a 2 chain structure with sequence from Pig. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: F6P, MG, OI1, PO4 Activity: Fructose-bisphosphatase, with EC number 3.1.3.11 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Fructose-1%2C6-bisphosphatase 3D structures

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