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Self-assembly of the light-harvesting complex of photosystem II (LHCII) on alkanethiol-modified gold electrodes

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Abstract

A light-harvesting complex of photosystem II (LHCII), isolated from spinach, was immobilized onto a gold electrode modified with self-assembled monolayers (SAMs) of alkanethiols, NH2–(CH2) n –SH, n = 2, 6, 8, 11; HOOC–(CH2)7–SH; and CH3–(CH2)7–SH; and a bare electrode. The extent of LHCII complex adsorption according to surface treatment decreased in the order amino groups > carboxylic acid groups > methyl groups and increased with the methylene chain length in NH2–(CH2) n –SH. Interestingly, the photocurrent density depended on the terminal group and the methylene chain length in NH2–(CH2) n –SH and decreased in the order amino groups > methyl groups > carboxylic acid groups. An efficient photocurrent response of the LHCII complex on SAMs of NH2–(CH2) n –SH, n = 8 was observed upon illumination at 680 nm. These results indicated that the LHCII complexes were well organized on the cationic surfaces of the gold electrodes modified with amino alkanethiols. The quantum yield depended on the methylene chain length (n), where the maximum photocurrent response was observed at n = 8, which corresponded to a distance of 1.7 nm between the terminal amino group in NH2–(CH2)8–SH and the gold surface.

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Acknowledgments

The authors are grateful to Prof. Ayumi Tanaka (Institute of Low Temperature Science, Hokkaido University, Japan) for the isolation and purification of LHCII complexes and their helpful advice and discussions. M.N. and H.H. are grateful for an international joint grant from JST Crest and the BBSRC for financial support. The present work was partially supported by JSPS KAKENHI Grant Number 25810097, AOARD, Funds for the Development of Human Resources in Science and Technology, and the TATEMATSU Foundation.

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Authors and Affiliations

  1. Center for Fostering Young and Innovative Researchers, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

    Masaharu Kondo

  2. Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

    Mizuki Amano, Fujii Kaoru, Ayumi Okuda, Shuichi Isigure, Takeshisa Dewa & Mamoru Nango

  3. OCARINA, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558 8585, Japan

    Yutaka Amao, Hideki Hashimoto & Mamoru Nango

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  1. Masaharu Kondo
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  2. Mizuki Amano
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  3. Fujii Kaoru
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  4. Ayumi Okuda
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  5. Shuichi Isigure
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  6. Takeshisa Dewa
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  7. Yutaka Amao
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  8. Hideki Hashimoto
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  9. Mamoru Nango
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Correspondence to Masaharu Kondo.

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Kondo, M., Amano, M., Kaoru, F. et al. Self-assembly of the light-harvesting complex of photosystem II (LHCII) on alkanethiol-modified gold electrodes. Res Chem Intermed 40, 3277–3285 (2014). https://doi.org/10.1007/s11164-014-1822-3

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  • DOI: https://doi.org/10.1007/s11164-014-1822-3

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