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.
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Shibanuma et al. (2011) studied this question.
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