Photochemically induced dynamic nuclear polarization in photosystem I of plants observed by 13C magic-angle spinning NMR |
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Authors: | Alia Roy Esha Gast Peter van Gorkom Hans J de Groot Huub J M Jeschke Gunnar Matysik Jörg |
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Institution: | Contribution from the Leiden Institute of Chemistry, Gorlaeus Laboratoria, P.O. Box 9502, 2300 RA Leiden, The Netherlands. |
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Abstract: | Photochemically induced dynamic nuclear polarization (photo-CIDNP) has been observed in photosystem I of spinach by (13)C magic angle spinning solid-state NMR under continuous illumination with white light. An almost complete set of chemical shifts of the aromatic ring carbons of a single Chl a molecule has been obtained which is assigned to the P2-cofactor of the primary electron donor P700. Since all light-induced (13)C NMR signals appear to be emissive, a predominance of the three-spin mixing mechanism over the differential decay mechanism is proposed. The origin of the strong contribution of the three-spin mixing mechanism and the differences with photosystem II are discussed. |
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