Molecular assembly of Zn porphyrin complexes using synthetic light-harvesting model polypeptides |
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Authors: | Tsuyoshi Ochiai Takahide Asaoka Tomoya Kato Shinichiro Osaka Takehisa Dewa Keiji Yamashita Alastair T Gardiner Hideki Hashimoto Mamoru Nango |
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Institution: | (1) Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku Nagoya, 466-8555, Japan;(2) Glasgow Biomedical Research Centre, Institute of Biomedical and Life Sciences, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK;(3) Department of Physics, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku Osaka, 558-8585, Japan |
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Abstract: | Synthetic single α-helix hydrophobic polypeptides, which have similar amino acid sequences to the hydrophobic core in the
native light-harvesting 1-β polypeptide from Rhodobacter sphaeroides, formed Zn porphyrin complexes on a gold electrode, as well as in n-octyl-β-glucoside micelles: this process is dependent on the structure of the pigments and the polypeptides. Interestingly,
an enhanced photoelectric current was observed when Zn mesoporphyrin monomer complexed with the synthetic light-harvesting
model polypeptide in an α-helical configuration was assembled with a defined orientation onto the electrode. Analog of these
light-harvesting model complexes are also useful in providing insights into the effect of polypeptide structure on the formation
of light-harvesting complexes on and off electrodes.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Zn porphyrin complex Light-harvesting model polypeptide Reconstitution Self-assembling Monolayer (SAM) Photocurrent |
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