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Designing ligands to bind proteins Whitesides GM; Krishnamurthy VMQ Rev Biophys 2005[Nov]; 38 (4): 385-95The ability to design drugs (so-called 'rational drug design') has been one of the long-term objectives of chemistry for 50 years. It is an exceptionally difficult problem, and many of its parts lie outside the expertise of chemistry. The much more limited problem - how to design tight-binding ligands (rational ligand design) - would seem to be one that chemistry could solve, but has also proved remarkably recalcitrant. The question is 'Why is it so difficult?' and the answer is 'We still don't entirely know'. This perspective discusses some of the technical issues - potential functions, protein plasticity, enthalpy/entropy compensation, and others - that contribute, and suggests areas where fundamental understanding of protein-ligand interactions falls short of what is needed. It surveys recent technological developments (in particular, isothermal titration calorimetry) that will, hopefully, make now the time for serious progress in this area. It concludes with the calorimetric examination of the association of a series of systematically varied ligands with a model protein. The counterintuitive thermodynamic results observed serve to illustrate that, even in relatively simple systems, understanding protein-ligand association is challenging.|*Drug Design[MESH]|*Ligands[MESH]|*Protein Binding[MESH]|Animals[MESH]|Biophysical Phenomena[MESH]|Biophysics[MESH]|Carbonic Anhydrase II/metabolism[MESH]|Cattle[MESH]|Entropy[MESH]|Hydrophobic and Hydrophilic Interactions[MESH]|In Vitro Techniques[MESH]|Models, Biological[MESH]|Sulfonamides/chemistry/metabolism[MESH]|Thermodynamics[MESH]|Water/chemistry[MESH] |
