Minor but key chlorophylls in Photosystem II
| Autor: | Takanori Gotoh, Tadashi Watanabe, Mamoru Mimuro, Takashi Yamashita, Satoru Watanabe, Masami Kobayashi, Machiko Akiyama, Hajime Koizumi, Y. Itoh, Yoshihiro Shiraiwa, Tohru Tsuchiya, Hideaki Miyashita |
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| Rok vydání: | 2005 |
| Předmět: |
Chlorophyll
Pheophytin Photosystem II Stereochemistry Acaryochloris marina Chlorophyll d Electron donor macromolecular substances Plant Science Photochemistry Biochemistry Electron Transport chemistry.chemical_compound polycyclic compounds Photosystem chemistry.chemical_classification Molecular Structure biology Chlorophyll A Pheophytins Eukaryota Photosystem II Protein Complex food and beverages Cell Biology General Medicine Electron acceptor biology.organism_classification Energy Transfer chemistry Petroselinum |
| Zdroj: | Photosynthesis Research. 84:201-207 |
| ISSN: | 1573-5079 0166-8595 |
| DOI: | 10.1007/s11120-005-0474-y |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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