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Keywords:

  • cytochromes;
  • electron transfer;
  • in vivo studies;
  • time-resolved spectroscopy;
  • UV/Vis spectroscopy
Thumbnail image of graphical abstract

Morning light: In vivo photodissociation of CO from bacterial c-type cytochromes yields a redox-active Fe2+ form, which can be oxidized at an electrode surface to the Fe3+ form. Reduction by electrons from the metabolic pathway regenerates the Fe2+ form (see picture). Spectroscopic monitoring of this process yields information on the in vivo respiratory electron-transport dynamics.