2dm5

Thermodynamic Penalty Arising From Burial of a Ligand Polar Group Within a Hydrophobic Pocket of a Protein Receptor

spinqualitylabelsall models 2dm5, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2dm5 is a 1 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Ligands: CD, ODI Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MUP2_MOUSE Binds pheromones that are released from drying urine of males. These pheromones affect the sexual behavior of females. 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 Here, we examine the thermodynamic penalty arising from burial of a polar group in a hydrophobic pocket that forms part of the binding-site of the major urinary protein (MUP-I). X-ray crystal structures of the complexes of octanol, nonanol and 1,8 octan-diol indicate that these ligands bind with similar orientations in the binding pocket. Each complex is characterised by a bridging water molecule between the hydroxyl group of Tyr120 and the hydroxyl group of each ligand. The additional hydroxyl group of 1,8 octan-diol is thereby forced to reside in a hydrophobic pocket, and isothermal titration calorimetry experiments indicate that this is accompanied by a standard free energy penalty of +21 kJ/mol with respect to octanol and +18 kJ/mol with respect to nonanol. Consideration of the solvation thermodynamics of each ligand enables the "intrinsic" (solute-solute) interaction energy to be determined, which indicates a favourable enthalpic component and an entropic component that is small or zero. These data indicate that the thermodynamic penalty to binding derived from the unfavourable desolvation of 1,8 octan-diol is partially offset by a favourable intrinsic contribution. Quantum chemical calculations suggest that this latter contribution derives from favourable solute-solute dispersion interactions. Thermodynamic penalty arising from burial of a ligand polar group within a hydrophobic pocket of a protein receptor.,Barratt E, Bronowska A, Vondrasek J, Cerny J, Bingham R, Phillips S, Homans SW J Mol Biol. 2006 Oct 6;362(5):994-1003. Epub 2006 Aug 1. PMID:16935302 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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