title: Specific Interaction between Redox Phospholipid Polymers and Plastoquinone in Photosynthetic Electron Transport Chain.
abstract: Redox phospholipid polymers added in culture media are known to be capable of extracting electrons from living photosynthetic cells across bacterial cell membranes with high cytocompatibility. In the present study, we identify the intracellular redox species that transfers electrons to the polymers. The open-circuit electrochemical potential of an electrolyte containing the redox polymer and extracted thylakoid membranes shift to positive (or negative) under light irradiation, when an electron transport inhibitor specific to plastoquinone is added upstream (or downstream) in the photosynthetic electron transport chain. The same trend is also observed for a medium containing living photosynthetic cells of Synechococcus elongatus PCC7942. These results clearly indicate that the phospholipid redox polymers extract photosynthetic electrons mainly from plastoquinone.
authors.affiliation: Department of Chemistry, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Kenya
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kaneko
authors.affiliation: Department of Biotechnology, Graduate School of Engineering, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan.|Research Center for Solar Energy Chemistry, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
authors.forename: Masahito
authors.initials: M
authors.lastname: Ishikawa
authors.affiliation: Research Center for Solar Energy Chemistry, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.|Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan.
authors.forename: Souichiro
authors.initials: S
authors.lastname: Kato
authors.affiliation: Education Academy of Computational Life Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Ito
authors.affiliation: Department of Life Science and Technology, Graduated School of Bioscience and Biotechnology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Kamachi
authors.affiliation: Department of Chemistry, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan.|Research Center for Solar Energy Chemistry, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Kamiya
authors.affiliation: Department of Chemistry, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan.|Research Center for Solar Energy Chemistry, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
authors.forename: Shuji
authors.initials: S
authors.lastname: Nakanishi
mesh_terms: D004579:Electron Transport; D010084:Oxidation-Reduction; D010743:Phospholipids / Q000737:chemistry / Q000378:metabolism*; D010788:Photosynthesis; D010971:Plastoquinone / Q000737:chemistry / Q000378:metabolism*; D011108:Polymers / Q000737:chemistry / Q000378:metabolism*; D046940:Synechococcus / Q000166:cytology / Q000378:metabolism*
chemical_list: D010743:Phospholipids; D011108:Polymers; D010971:Plastoquinone
keywords: circadian clocks; electrochemistry; extracellular electron transfer; photosynthesis; redox polymers