Abstract:
:The origin of the extraordinary high redox potential of P680, the primary electron donor of Photosystem II, is still unknown. Photochemically induced dynamic nuclear polarisation (photo-CIDNP) 13C magic-angle spinning (MAS) NMR is a powerful method to study primary electron donors. In order to reveal the electronic structure of P680, we compare new photo-CIDNP MAS NMR data of Photosystem II to those of Photosystem I. The comparison reveals that the electronic structure of the P680 radical cation is a Chl a cofactor with strong matrix interaction, while the radical cation of P700, the primary electron donor of Photosystem I, appears to be a Chl a cofactor which is essentially undisturbed. Possible forms of cofactor-matrix interactions are discussed.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Diller A,Alia,Roy E,Gast P,van Gorkom HJ,Zaanen J,de Groot HJ,Glaubitz C,Matysik Jdoi
10.1007/s11120-005-0411-0subject
Has Abstractpub_date
2005-06-01 00:00:00pages
303-8issue
1-3eissn
0166-8595issn
1573-5079journal_volume
84pub_type
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