Alumina plate containing photosystem i reaction center complex oriented inside plate-penetrating silica nanopores

Chihiro Kamidaki, Toru Kondo, Tomoyasu Noji, Tetsuji Itoh, Akira Yamaguchi, Shigeru Itoh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The photosynthetic photosystem I reaction center complex (PSI-RC), which has a molecular diameter of 21 nm with 100 pigments, was incorporated into silica nanopores with a 100-nm diameter that penetrates an alumina plate of 60-μm thickness to make up an inorganic-biological hybrid photocell. PSI-RCs, purified from a thermophilic cyanobacterium, were stable inside the nanopores and rapidly photoreduced a mediator dye methyl viologen. The reduced dye was more stable inside nanopores suggesting the decrease of dissolved oxygen. The analysis by a cryogenic electron spin paramagnetic resonance indicated the oriented arrangement of RCs inside the 100-nm nanopores, with their surface parallel to the silica wall and perpendicular to the plane of the alumina plate. PSI RC complex in the semicrystalline orientation inside silica nanopores can be a new type of light energy conversion unit to supply strong reducing power selectively to other molecules inside or outside nanopores.

Original languageEnglish
Pages (from-to)9785-9792
Number of pages8
JournalJournal of Physical Chemistry B
Volume117
Issue number33
DOIs
Publication statusPublished - 2013 Aug 22
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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