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Keywords:

  • cyclodextrins;
  • cytochrome c;
  • electrostatic interactions;
  • protein modifications;
  • supramolecular chemistry
Thumbnail image of graphical abstract

A threesome: An anionic cyclodextrin binds electrostatically with cationic cytochrome c (K=2.3×104M−1, ΔH=9.3 kJ mol−1, ΔS=115 J mol−1 K−1). The cyclodextrin covers the hemin pockets of about two-thirds of the cyt c molecules. This association complex further complexes with a nonionic porphyrin to form a ternary complex in which static fluorescence quenching of the porphyrin by cyt c takes place.