Chinone in photosynthetischen Phosphorylierungen

Abstract

The Hill reaction with benzoquinones as electron acceptors is coupled to a phosphorylation. All benzo-, naphtho-and anthroquinones examined are cofactors of cyclic photophosphorylation in air. Quinones with redox potentials lower than zero are also cofactors of cyclic photophosphorylation without O2. It is assumed that these hydroquinones are able to react with an oxidized cytochrome. Substituted benzoquinones related to plastoquinone, naphtho-and anthraquinones with potentials lower than zero, chlorogenic acid and dioxyphenylalanine are particularly active.