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Updated: Apr 11, 2026

Determination of Protein-ligand Interactions Using Differential Scanning Fluorimetry
Published on: September 13, 2014
Non-two-state thermal denaturation of ferricytochrome c at neutral and slightly acidic pH values
Rastislav Varhač1, Dagmar Sedláková2, Marek Stupák3
1Department of Biochemistry, P.J. Šafárik University, Moyzesova 11, 040 01 Košice, Slovakia.
Abstract:
Thermal denaturation of ferricytochrome c (cyt c) has been methodically studied by absorbance, fluorescence, circular dichroism spectroscopy, viscosimetry and differential scanning calorimetry in pH range from pH 3.5 to 7.5. Thermal transitions have been monitored by intrinsic local probes of heme region such as absorbance at Soret, 620nm and 695nm bands and circular dichroism signals at 417nm. Global conformational changes were analyzed by circular dichroism signal at 222nm, fluorescence of the single tryptophan, reduced viscosity and differential scanning calorimetry. We show that cyt c thermal denaturation above pH ~5 can be described by an apparent two-step transition in which the heme iron stays in a low-spin state. The thermal denaturations of cyt c below pH ~5 proceed in one step to an unfolded highly compact form with a high-spin state of the heme iron. Cyt c conformational plasticity is discussed in regard to its physiological functions.
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