Thermodynamics of glucagon aggregation.
1979
Heats of dilution of concentrated glucagon solutions have been measured calorimetrically at 10 and 25 degrees C in 0.2 M potassium phosphate buffer of pH 10.6. Analysis of the data in terms of a monomer-trimer equilibrium gives the following thermodynamic parameters for the association reaction at 25 degrees C: delta G degrees = 7.34 kcal/mol of trimer, delta H degrees = -31.2 kcal/mol, deltaS degrees = -80 cal/(K mol), deltaCp = 430 cal/(K mol). The sensitivity of heat of dilution data to the association constant and stoichiometry of the reaction is discussed.
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