6zn0 | pdb_00006zn0

Crystal structure of cAMP-dependent protein kinase A (CHO PKA) in complex with isonicotinamidine

spinqualitylabelsall models 6zn0, resolution 1.59Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.59Å Ligands: DMS, MRD, NTN, SEP, TPO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Medicinal-chemistry optimization follows strategies replacing functional groups and attaching larger substituents at a promising lead scaffold. Well-established bioisosterism rules are considered, however, it is difficult to estimate whether the introduced modifications really match the required properties at a binding site. The electron density distribution and pKa values are modulated influencing protonation states and bioavailability. Considering the adjacent H-bond donor/acceptor pattern of the hinge binding motif in a kinase, we studied by crystallography a set of fragments to map the required interaction pattern. Unexpectedly, benzoic acid and benzamidine, decorated with the correct substituents, are totally bioisosteric just as carboxamide and phenolic OH. A mono-dentate pyridine nitrogen out-performs bi-dentate functionalities. The importance of correctly designing pKa values of attached functional groups by additional substituents at the parent scaffold is rendered prominent. Fragment Binding to Kinase Hinge: If Charge Distribution and Local pKa Shifts Mislead Popular Bioisosterism Concepts.,Oebbeke M, Siefker C, Wagner B, Heine A, Klebe G Angew Chem Int Ed Engl. 2020 Oct 6. doi: 10.1002/anie.202011295. PMID:33021032 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also CAMP-dependent protein kinase 3D structures

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