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pubmed-article:8889179pubmed:abstractTextA theoretical development in the evaluation of proton linkage in protein binding reactions by isothermal titration calorimetry (ITC) is presented. For a system in which binding is linked to protonation of an ionizable group on a protein, we show that by performing experiments as a function of pH in buffers with varying ionization enthalpy, one can determine the pK(a)'s of the group responsible for the proton linkage in the free and the liganded states, the protonation enthalpy for this group in these states, as well as the intrinsic energetics for ligand binding (delta H(o), delta S(o), and delta C(p)). Determination of intrinsic energetics in this fashion allows for comparison with energetics calculated empirically from structural information. It is shown that in addition to variation of the ligand binding constant with pH, the observed binding enthalpy and heat capacity change can undergo extreme deviations from their intrinsic values, depending upon pH and buffer conditions.lld:pubmed
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pubmed-article:8889179pubmed:articleTitleEvaluation of linked protonation effects in protein binding reactions using isothermal titration calorimetry.lld:pubmed
pubmed-article:8889179pubmed:affiliationDepartment of Biochemistry, University of Iowa, Iowa City 52242, USA.lld:pubmed
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