Many biological macromolecules undergo a transition called denaturation. Denaturation is a process whereby a structured, biologically active

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Many biological macromolecules undergo a transition called denaturation. Denaturation is a process whereby a structured, biologically active molecule, called the native form, unfolds or becomes unstructured and biologically inactive. The equilibrium is native(folded) ⇋ denatured(unfolded)

For a protein at pH = 2 the enthalpy change at 298 K associated with denaturation is ΔHo = 418.0 kJ mol−1 and the entropy change at 298 K is ΔSo = 1.30 kJ K−1 mol−1.

a. Calculate the Gibbs energy change for the denaturation of the protein at pH = 2 and T = 310.K.Assume the enthalpy and entropy are temperature-independent between 298.15 K and 310. K.

b. Calculate the equilibrium constant for the denaturation of the protein at pH = 2 and T = 310.K.

c. Based on your answer for parts (a) and (b), is the protein structurally stable at pH = 2 and T = 310.K?

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Physical Chemistry

ISBN: 978-0321812001

3rd edition

Authors: Thomas Engel, Philip Reid

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