Extension of Light-Harvesting and Photocurrent Generation Activities of Biohybrid Light-Harvesting and Reaction Center Complexes Through Attachment of Artificial Chromophores

Takehisa Dewa^a

^aNagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan

Proceedings of International Online Conference on Bio-hybrid Approaches to Solar Energy Conversion (Biohybrid)

Online, Spain, 2020 October 27th - 29th

Organizers: Jenny Zhang, Vincent Friebe and Lars Jeuken

Invited Speaker, Takehisa Dewa, presentation 001
Publication date: 8th October 2020

A light harvesting system that efficiently drives photocatalytic component is essential for converting solar light into chemical energy. Recently, we constructed biohybrid light-harvesting (LH) systems composed of LH complexes from photosynthetic purple bacteria to which artificial dyes are covalently attached as external LH pigments [1-3]. The LH activity of light-harvesting 2 (LH2) complexes was successfully enhanced through attachment of fluorophores, e.g., Alexas and ATTO. Energy transfer from the fluorophores to bacteriochlorophylls, B800 and B850, was observed in the time domain of sub-pico to dozen of picoseconds. We have also demonstrated that the biohybrid LH2 complexes efficiently drive a photocatalytic component, light-harvesting 1–reaction center core complex (LH1-RC), which exhibited enhanced charge separation and photocurrent generation activity when assembled into lipid bilayer [3,4]. Contribution of LH to the photocatalytic reactions in LH1-RC was quantitatively evaluated. More recently, we constructed biohybrid-type LH1-RCs, to which the fluorophores directly attached to LH1. Enhanced activities of LH and photocurrent generation were observed [5].

References:

[1] Yoneda, Y.; Noji, T.; Katayama, T.; Mizutani, N.; Komori, D.; Nango, M.; Miyasaka, H.; Itoh, S.; Nagasawa, Y.; Dewa, T. Extension of Light-Harvesting Ability of Photosynthetic Light-Harvesting Complex 2 (LH2) through Ultrafast Energy Transfer from Covalently Attached Artificial Chromophores. J. Am. Chem. Soc., 2015, 137, 13121-13129.

[2] Yoneda, Y.; Kato, D.; Kondo, M.; Nagashima, K. V. P.; Miyasaka, H.; Nagasawa, Y.; Dewa, T. Sequential energy transfer driven by monoexponential dynamics in a biohybrid light-harvesting complex 2 (LH2). Photosynth. Res. 2020, 143, 115-128.

[3] Yoneda, Y.; Goto, A.; Takeda, N.; Harada, H.; Kondo, M.; Miyasaka, H.; Nagasawa, Y. Dewa, T. Ultrafast Photodynamics and Quantitative Evaluation of Biohybrid Photosynthetic Antenna and Reaction Center Complexes Generating Photocurrent. J. Phys. Chem. C 2020, 124, 8605-8615.

[4] Noji, T.; Matsuo, M.; Takeda, N.; Sumino, A.; Kondo, M.; Nango, M.; Itoh, S.; Dewa, T. Lipid-Controlled Stabilization of Charge-Separated States (P+QB–) and Photocurrent Generation Activity of a Light-Harvesting–Reaction Center Core Complex (LH1-RC) from Rhodopseudomonas palustris. J. Phys. Chem. B 2018, 122, 1066-1080.

[5] Kasagi, G.; Yoneda, Y.; Kondo, M.; Miyasaka, H.; Nagasawa, Y.; Dewa, T. Enhanced light harvesting and photocurrent generation activities of biohybrid light–harvesting 1–Reaction center core complexes (LH1-RCs) from Rhodopseudomonas palustris. J. Photochem. Photobiol. A: Chemistry 2020, in press

Acknowledgements:

The author is grateful to collaborators on this project, especially, Drs. Yusuke Yoneda, Professors Hiroshi Miyasaka (Osaka University), and Yutaka Nagasawa (Ritsumeikan University).

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