5g1a | pdb_00005g1a

Bordetella Alcaligenes HDAH bound to PFSAHA

spinqualitylabelsall models 5g1a, resolution 1.42Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5g1a is a 2 chain structure with sequence from Alcaligenes. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.42Å Ligands: 1PE, 7H1, K, PEG, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HDAH_ALCSD Publication Abstract from PubMed BACKGROUND: The analysis of the thermodynamic driving forces of ligand-protein binding has been suggested to be a key component for the selection and optimization of active compounds into drug candidates. The binding enthalpy as deduced from isothermal titration calorimetry (ITC) is usually interpreted assuming single-step binding of a ligand to one conformation of the target protein. Although successful in many cases, these assumptions are oversimplified approximations of the reality with flexible proteins and complicated binding mechanism in many if not most cases. The relationship between protein flexibility and thermodynamic signature of ligand binding is largely understudied. METHODS: Directed mutagenesis, X-ray crystallography, enzyme kinetics and ITC methods were combined to dissect the influence of loop flexibility on the thermodynamics and mechanism of ligand binding to histone deacetylase (HDAC)-like amidohydrolases. RESULTS: The general ligand-protein binding mechanism comprises an energetically demanding gate opening step followed by physical binding. Increased flexibility of the L2-loop in HDAC-like amidohydrolases facilitates access of ligands to the binding pocket resulting in predominantly enthalpy-driven complex formation. CONCLUSIONS: The study provides evidence for the great importance of flexibility adjacent to the active site channel for the mechanism and observed thermodynamic driving forces of molecular recognition in HDAC like enzymes. GENERAL SIGNIFICANCE: The flexibility or malleability in regions adjacent to binding pockets should be given more attention when designing better drug candidates. The presented case study also suggests that the observed binding enthalpy of protein-ligand systems should be interpreted with caution, since more complicated binding mechanisms may obscure the significance regarding potential drug likeness. The thermodynamic signature of ligand binding to histone deacetylase-like amidohydrolases is most sensitive to the flexibility in the L2-loop lining the active site pocket.,Meyners C, Kramer A, Yildiz O, Meyer-Almes FJ Biochim Biophys Acta. 2017 Apr 4. pii: S0304-4165(17)30126-5. doi:, 10.1016/j.bbagen.2017.04.001. PMID:28389333 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Histone deacetylase 3D structures

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