Journal
PHOTOSYNTHESIS RESEARCH
Volume 84, Issue 1-3, Pages 303-308Publisher
SPRINGER
DOI: 10.1007/s11120-005-0411-0
Keywords
electron transfer; P680; photo-CIDNP; Photosystem II; solid-state NMR
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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) C-13 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 electon donor of Photosystem I, appears to be a Chl a cofactor which is essentially undisturbed. Possible forms of cofactor-matrix interactions are discussed.
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