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Correlation analysis for heat denaturation of Trp‐cage miniprotein with explicit solvent

Energetics was analyzed for Trp‐cage miniprotein in water to elucidate the solvation effect in heat denaturation. The solvation free energy was computed for a set of protein structures at room and high temperatures with all‐atom molecular dynamics simulation combined with the solution theory in the energy representation, and its correlations were investigated against the intramolecular (structural) energy of the protein and the average interaction energy of the protein with the solvent water. It was observed both at room and high temperatures that the solvation free energy is anticorrelated to the structural energy and varies in parallel to the electrostatic component of the protein–water interaction energy without correlations to the van der Waals and excluded‐volume components. When the set of folded structures sampled at room temperature was compared with the set of unfolded ones at high temperature, it was found that the preference order of the two sets is in correspondence to the van der Waals and excluded‐volume components in the sum of the protein intramolecular and protein‐water intermolecular interactions and is not distinguished by the electrostatic component.