NDLI: Proton-Coupled Electron Transfer in Photosystem II: Proton Inventory of a Redox Active Tyrosine

Content Provider	PubMed Central
Author	Jenson, David L. Barry, Bridgette A.
Abstract	Photosystem II (PSII) catalyzes the light driven oxidation of water and the reduction of plastoquinone. PSII is a multisubunit membrane protein; the D1 and D2 polypeptides form the heterodimeric core of the PSII complex. Water oxidation occurs at a manganese-containing oxygen evolving complex (OEC). PSII contains two redox active tyrosines, YZ and YD, which form the neutral tyrosyl radicals, Yz • and YD •. YD has been assigned as tyrosine 160 in the D2 polypeptide through isotopic labeling and site-directed mutagenesis. While YD is not directly involved in the oxidation of water, it has been implicated in the formation and stabilization of the OEC. PSII structures have shown YD to be within hydrogen bonding distance of histidine 189 in the D2 polypeptide. Spectroscopic studies have suggested that a proton is transferred between YD and histidine 189 when YD is oxidized and reduced. In our previous work, we used 2H2O solvent exchange to demonstrate that the mechanism of YD proton-coupled electron transfer (PCET) differs at high and low pH (Jenson, D. L.; Evans, A.; Barry, B. A. J. Phys. Chem. B 2007, 111, 12599–12604). In this paper, we utilize the proton inventory technique to obtain more information concerning the PCET mechanism at high pH. The hypercurvature of the proton inventory data provides evidence for the existence of multiple, proton donation pathways to YD •. In addition, at least one of these pathways must involve the transfer of more than one proton.
Related Links	http://dx.doi.org/10.1021/ja902896e
Ending Page	10573
Page Count	7
Starting Page	10567
File Format	PDF
ISSN	00027863
e-ISSN	15205126
Journal	Journal of the American Chemical Society
Issue Number	30
Volume Number	131
Language	English
Publisher Date	2009-08-05
Access Restriction	Open
Subject Keyword	Colloid and Surface Chemistry Biochemistry Chemistry(all) Catalysis Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Chemistry Colloid and Surface Chemistry Biochemistry Catalysis

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