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

Gözde Ulas, Gary W Brudvig

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

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
Volume133
Issue number34
DOIs
Publication statusPublished - Aug 31 2011

Fingerprint

Photosystem II Protein Complex
Coordination Complexes
Metal complexes
Oxidation-Reduction
Electrons
Water
Diuron
Binding sites
Binding Sites
Herbicides
Electrodes
Oxygen
Membranes
Oxidation

ASJC Scopus subject areas

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

Cite this

Redirecting electron transfer in photosystem II from water to redox-active metal complexes. / Ulas, Gözde; Brudvig, Gary W.

In: Journal of the American Chemical Society, Vol. 133, No. 34, 31.08.2011, p. 13260-13263.

Research output: Contribution to journalArticle

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