Abstract
In order to use results from calorimetry or thermal unfolding curves to estimate the free energy change for protein unfolding at 25 degrees C, it is necessary to know the change in heat capacity for unfolding, delta Cp. We describe a new method for measuring delta Cp which is based on results from urea and thermal unfolding curves but does not require a calorimeter. We find that delta Cp = 1650 +/- 200 cal/(deg.mol) for the unfolding of ribonuclease T1 and that delta Cp = 2200 +/- 300 cal/(deg.mol) for the unfolding of ribonuclease A.
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