Redirecting electron transfer in photosystem II from water to redox-active metal complexes

Gözde Ulas, Gary W. Brudvig

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


A negatively charged region on the surface of photosystem II (PSII) near Q A has been identified as a docking site for cationic exogenous electron acceptors. Oxygen evolution activity, which is inhibited in the presence of the herbicide 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), is recovered by adding Co III complexes. Thus, a new electron-transfer pathway is created with Co III as the new terminal electron acceptor from Q A -. This binding site is saturated at ∼2.5 mM [Co III], which is consistent with the existence of low-affinity interactions with a solvent-exposed surface. This is the first example of a higher plant PSII in which the electron-transfer pathway has been redirected from the normal membrane-associated quinone electron acceptors to water-soluble electron acceptors. The proposed Co III binding site may enable efficient collection of electrons generated from photochemical water oxidation by PSII immobilized on an electrode surface.

Original languageEnglish
Pages (from-to)13260-13263
Number of pages4
JournalJournal of the American Chemical Society
Issue number34
Publication statusPublished - Aug 31 2011

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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