The stability of proteins as a function of pressure and temperature is characterized by elliptic phase diagrams. In this work pressure- and temperature-induced denaturation experiments on a modified cytochrome c protein in a diamond anvil cell were carried out. The determination of the phase transition was possible by the change in the laser-induced fluorescence spectrum. The change in the interactions between chromophore and environment results in a characteristic spectral pattern, confirming different models for the explanation of pressure- and temperature-induced denaturation. The complete stability diagram of Zn-mesoporphyrin cytochrome c was determined. In addition, the interaction radius of the dye probe inside the protein was estimated by using pressure-tuning hole-burning spectroscopy.
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The stability of proteins as a function of pressure and temperature is characterized by elliptic phase diagrams. In this work pressure- and temperature-induced denaturation experiments on a modified cytochrome c protein in a diamond anvil cell were carried out. The determination of the phase transition was possible by the change in the laser-induced fluorescence spectrum. The change in the interactions between chromophore and environment results in a characteristic spectral pattern, confirming d...
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