Filling the Green Gap of a Megadalton Photosystem I Complex by Conjugation of Organic Dyes

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• 作者：Pavlo I. Gordiichuk ; Dolev Rimmerman ; Avishek Paul ; Daniel A. Gautier ; Agnieszka Gruszka ; Manfred Saller ; Jan Willem de Vries ; Gert-Jan A. H. Wetzelaer ; Marianna Manca ; Widianta Gomulya ; Maayan Matmor ; Ekaterina Gloukhikh ; Mark Loznik ; Nurit Ashkenasy ; Paul W. M. Blom ; Matthias R?gner ; Maria Antonietta Loi ; Shachar Richter ; Andreas Herrmann
• 刊名：Bioconjugate Chemistry
• 出版年：2016
• 出版时间：January 20, 2016
• 年：2016
• 卷：27
• 期：1
• 页码：36-41
• 全文大小：392K
• ISSN：1520-4812

文摘

Photosynthesis is Nature’s major process for converting solar into chemical energy. One of the key players in this process is the multiprotein complex photosystem I (PSI) that through absorption of incident photons enables electron transfer, which makes this protein attractive for applications in bioinspired photoactive hybrid materials. However, the efficiency of PSI is still limited by its poor absorption in the green part of the solar spectrum. Inspired by the existence of natural phycobilisome light-harvesting antennae, we have widened the absorption spectrum of PSI by covalent attachment of synthetic dyes to the protein backbone. Steady-state and time-resolved photoluminescence reveal that energy transfer occurs from these dyes to PSI. It is shown by oxygen-consumption measurements that subsequent charge generation is substantially enhanced under broad and narrow band excitation. Ultimately, surface photovoltage (SPV) experiments prove the enhanced activity of dye-modified PSI even in the solid state.