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 language | English |
|---|---|
| Pages (from-to) | 13260-13263 |
| Number of pages | 4 |
| Journal | Journal of the American Chemical Society |
| Volume | 133 |
| Issue number | 34 |
| DOIs | |
| Publication status | Published - Aug 31 2011 |
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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 journal › Article
}
TY - JOUR
T1 - Redirecting electron transfer in photosystem II from water to redox-active metal complexes
AU - Ulas, Gözde
AU - Brudvig, Gary W
PY - 2011/8/31
Y1 - 2011/8/31
N2 - 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.
AB - 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.
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U2 - 10.1021/ja2049226
DO - 10.1021/ja2049226
M3 - Article
VL - 133
SP - 13260
EP - 13263
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 34
ER -