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Minor but key chlorophylls in Photosystem II

Authors :
Takanori Gotoh
Tadashi Watanabe
Mamoru Mimuro
Takashi Yamashita
Satoru Watanabe
Masami Kobayashi
Machiko Akiyama
Hajime Koizumi
Y. Itoh
Yoshihiro Shiraiwa
Tohru Tsuchiya
Hideaki Miyashita
Source :
Photosynthesis Research. 84:201-207
Publication Year :
2005
Publisher :
Springer Science and Business Media LLC, 2005.

Abstract

A 'metal-free' chlorophyll (Chl) a, pheophytin (Phe) a, functions as the primary electron acceptor in PS II. On the basis of Phe a/PS II = 2, Phe a content is postulated as an index for estimation of the stoichiometry of pigments and photosystems. We found Phe a in a Chl d-dominant cyanobacterium Acaryochloris marina, whereas Phe d was absent. The minimum Chl a:Phe a ratio was 2:2, indicating that the primary electron donor is Chl a, accessory is Chl d, and the primary electron acceptor is Phe a in PS II of A. marina. Chl d was artificially formed by the treatment of Chl a with papain in aqueous organic solvents. Further, we will raise a key question on the mechanisms of water oxidation in PS II.

Details

ISSN :
15735079 and 01668595
Volume :
84
Database :
OpenAIRE
Journal :
Photosynthesis Research
Accession number :
edsair.doi.dedup.....0734bf67a4e2a575382c70f12e4aab32
Full Text :
https://doi.org/10.1007/s11120-005-0474-y