4ww8 | pdb_00004ww8

Crystal structure of human carbonic anhydrase isozyme XII with 4-Propylthiobenzenesulfonamide

spinqualitylabelsall models 4ww8, resolution 1.42Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ww8 is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: EDO, VD9, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease CAH12_HUMAN Defects in CA12 are the cause of hyperchlorhidrosis isolated (HCHLH) [MIM:143860. HCHLH is a disorder characterized by excessive sweating and increased sweat chloride levels. Affected individuals suffer from episodes of hyponatremic dehydration and report increased amounts of visible salt precipitates in sweat. Function CAH12_HUMAN Reversible hydration of carbon dioxide. Publication Abstract from PubMed Para substituted tetrafluorobenzenesulfonamides bind to carbonic anhydrases (CAs) extremely tightly and exhibit some of the strongest known protein-small ligand interactions, reaching an intrinsic affinity of 2 pM as determined by displacement isothermal titration calorimetry (ITC). The enthalpy and entropy of binding to five CA isoforms were measured by ITC in two buffers of different protonation enthalpies. The pKa values of compound sulfonamide groups were measured potentiometrically and spectrophotometrically, and enthalpies of protonation were measured by ITC in order to evaluate the proton linkage contributions to the observed binding thermodynamics. Intrinsic means the affinity of a sulfonamide anion for the Zn bound water form of CAs. Fluorination of the benzene ring significantly enhanced the observed affinities as it increased the fraction of deprotonated ligand while having little impact on intrinsic affinities. Intrinsic enthalpy contributions to the binding affinity were dominant over entropy and were more exothermic for CA I than for other CA isoforms. Thermodynamic measurements together with the X-ray crystallographic structures of protein-ligand complexes enabled analysis of structure-activity relationships in this enzyme ligand system. Intrinsic thermodynamics of 4-substituted-2,3,5,6-tetrafluorobenzenesulfonamide binding to carbonic anhydrases by isothermal titration calorimetry.,Zubriene A, Smirnoviene J, Smirnov A, Morkunaite V, Michailoviene V, Jachno J, Juozapaitiene V, Norvaisas P, Manakova E, Grazulis S, Matulis D Biophys Chem. 2015 Jun 6;205:51-65. doi: 10.1016/j.bpc.2015.05.009. PMID:26079542 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Carbonic anhydrase 3D structures

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