Using site-directed mutagenesis to probe the role of the D2 carotenoid in the secondary electron-transfer pathway of photosystem II

Shinopoulos, Katherine E.; Yu, Jianfeng; Nixon, Peter J.; Brudvig, Gary W.

doi:10.1007/s11120-013-9793-6

Title: Using site-directed mutagenesis to probe the role of the D2 carotenoid in the secondary electron-transfer pathway of photosystem II

Journal Article · Mon Jan 21 00:00:00 EST 2013 · Photosynthesis Research

DOI:https://doi.org/10.1007/s11120-013-9793-6· OSTI ID:1816417

Shinopoulos, Katherine E. ^[1]; Yu, Jianfeng ^[2]; Nixon, Peter J. ^[3]; Brudvig, Gary W. ^[1]

Yale Univ., New Haven, CT (United States). Dept. of Chemistry
Imperial College, London (United Kingdom). Wolfson Labs. Division of Molecular Biosciences
Imperial College, London (United Kingdom). Wolfson Labs. Division of Molecular Biosciences

Secondary electron transfer in photosystem II (PSII), which occurs when water oxidation is inhibited, involves redox-active carotenoids (Car), as well as chlorophylls (Chl), and cytochrome b ₅₅₉ (Cyt b ₅₅₉), and is believed to play a role in photoprotection. Car_D2 may be the initial point of secondary electron transfer because it is the closest cofactor to both P₆₈₀, the initial oxidant, and to Cyt b ₅₅₉, the terminal secondary electron donor within PSII. In order to characterize the role of Car_D2 and to determine the effects of perturbing Car_D2 on both the electron-transfer events and on the identity of the redox-active cofactors, it is necessary to vary the properties of Car_D2 selectively without affecting the ten other Car per PSII. To this end, site-directed mutations around the binding pocket of Car_D2 (D2-G47W, D2-G47F, and D2-T50F) have been generated in Synechocystis sp. PCC 6803. Characterization by near-IR and EPR spectroscopy provides the first experimental evidence that Car_D2 is one of the redox-active carotenoids in PSII. There is a specific perturbation of the Car∙+ near-IR spectrum in all three mutated PSII samples, allowing the assignment of the spectral signature of Car$$^{∙+}_{D2}$$; Car$$^{∙+}_{D2}$$ exhibits a near-IR peak at 980 nm and is the predominant secondary donor oxidized in a charge separation at low temperature in ferricyanide-treated wild-type PSII. The yield of secondary donor radicals is substantially decreased in PSII complexes isolated from each mutant. In addition, the kinetics of radical formation are altered in the mutated PSII samples. These results are consistent with oxidation of Car_D2 being the initial step in secondary electron transfer. Furthermore, normal light levels during mutant cell growth perturb the shape of the Chl^∙+ near-IR absorption peak and generate a dark-stable radical observable in the EPR spectra, indicating a higher susceptibility to photodamage further linking the secondary electron-transfer pathway to photoprotection.

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Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: FG02-05ER15646

OSTI ID:: 1816417

Journal Information:: Photosynthesis Research, Vol. 120, Issue 1-2; ISSN 0166-8595

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Using site-directed mutagenesis to probe the role of the D2 carotenoid in the secondary electron-transfer pathway of photosystem II

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