title: Conjugates between photosystem I and a carbon nanotube for a photoresponse device.
abstract: Photosystem I (PS I) is a large pigment-protein complex embedded in the thylakoid membranes that performs light-driven electron transfer across the thylakoid membrane. Carbon nanotubes exhibit excellent electrical conductivities and excellent strength and stiffness. In this study, we generated PSI-carbon nanotube conjugates dispersed in a solution aimed at application in artificial photosynthesis. PS I complexes in which a carbon nanotube binding peptide was introduced into the middle of the PsaE subunit were conjugated on a single-walled carbon nanotube, orienting the electron acceptor side to the nanotube. Spectral and photoluminescence analysis showed that the PS I is bound to a single-walled carbon nanotube, which was confirmed by transmission electron microscopy. Photocurrent observation proved that the photoexcited electron originated from PSI and transferred to the carbon nanotube with light irradiation, which also confirmed its orientated conjugation. The PS I-carbon nanotube conjugate will be a useful nano-optoelectronic device for the development of artificial systems.
authors.affiliation: Department of Physics, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Nii
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
authors.forename: Mariko
authors.initials: M
authors.lastname: Miyachi
authors.affiliation: Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Shimada
authors.affiliation: Department of Physics, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Nozawa
authors.affiliation: Department of Physics, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Ito
authors.affiliation: Department of Physics, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Homma
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
authors.forename: Shu
authors.initials: S
authors.lastname: Ikehira
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Yamanoi
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nishihara
authors.affiliation: Department of Physics, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan. tomo@rs.tus.ac.jp.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Tomo
mesh_terms: D002498:Centrifugation; D004579:Electron Transport; D004591:Electrophoresis, Polyacrylamide Gel; D008027:Light; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010777:Photochemistry / Q000295:instrumentation*; D045331:Photosystem I Protein Complex / Q000378:metabolism*; D046939:Synechocystis / Q000378:metabolism
chemical_list: D037742:Nanotubes, Carbon; D045331:Photosystem I Protein Complex
keywords: Carbon nanotube; Nano-device; Photosystem