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Identification of the primary electron donor in PS II of the Chl d ‐dominated cyanobacterium Acaryochloris marina
Author(s) -
Mimuro Mamoru,
Akimoto Seiji,
Gotoh Takanori,
Yokono Makio,
Akiyama Machiko,
Tsuchiya Tohru,
Miyashita Hideaki,
Kobayashi Masami,
Yamazaki Iwao
Publication year - 2004
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(03)01383-8
Subject(s) - pheophytin , photosystem ii , chemistry , chlorophyll a , chlorophyll , photochemistry , pigment , photosystem i , photosynthetic pigment , electron transport chain , botany , photosynthesis , biology , biochemistry , organic chemistry
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.