title: Identification of the primary electron donor in PS II of the Chl d-dominated cyanobacterium Acaryochloris marina.
abstract: The primary electron donor of photosystem (PS) II in the chlorophyll (Chl) d-dominated cyanobacterium Acaryochloris marina was confirmed by delayed fluorescence (DF) and further proved by pigment contents of cells grown under several light intensities. The DF was found only in the Chl a region, identical to Synechocystis sp. PCC 6803, and disappeared following heat treatment. Pigment analyses indicated that at least two Chl a molecules were present per each two pheophytin a molecules, and these Chl a molecules are assigned to P(D1) and P(D2). These findings clearly indicate that Chl a is required for water oxidation in PS II.
authors.affiliation: Department of Technology and Ecology, Hall of Global Environmental Research, Kyoto University, 606-8501, Kyoto, Japan. mamo_mi@bio.kyoto-u.ac.jp
authors.forename: Mamoru
authors.initials: M
authors.lastname: Mimuro
authors.forename: Seiji
authors.initials: S
authors.lastname: Akimoto
authors.forename: Takanori
authors.initials: T
authors.lastname: Gotoh
authors.forename: Makio
authors.initials: M
authors.lastname: Yokono
authors.forename: Machiko
authors.initials: M
authors.lastname: Akiyama
authors.forename: Tohru
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: Hideaki
authors.initials: H
authors.lastname: Miyashita
authors.forename: Masami
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Iwao
authors.initials: I
authors.lastname: Yamazaki
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism; D002734:Chlorophyll / Q000032:analysis / Q000737:chemistry*; D000077194:Chlorophyll A; D000458:Cyanobacteria / Q000737:chemistry* / Q000166:cytology / Q000254:growth & development; D004579:Electron Transport; D005453:Fluorescence; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000378:metabolism; D013050:Spectrometry, Fluorescence
chemical_list: D001426:Bacterial Proteins; D045332:Photosystem II Protein Complex; D002734:Chlorophyll; C107509:chlorophyll d; D000077194:Chlorophyll A