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Characterization of the Primary Radical Pair in Reaction Centers of Heliobacillus mobilis by <sup>13</sup>C Photo-CIDNP MAS NMR

Characterization of the Primary Radical Pair in Reaction Centers of Heliobacillus mobilis by 13C Photo-CIDNP MAS NMR

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ROY, Esha, Thierry ROHMER, Peter GAST, Gunnar JESCHKE, Alia ALIA, Jörg MATYSIK, 2008. Characterization of the Primary Radical Pair in Reaction Centers of Heliobacillus mobilis by 13C Photo-CIDNP MAS NMR. In: Biochemistry. American Chemical Society (ACS). 47(16), pp. 4629-4635. ISSN 0006-2960. eISSN 1520-4995. Available under: doi: 10.1021/bi800030g

@article{Roy2008-04-22Chara-58673, title={Characterization of the Primary Radical Pair in Reaction Centers of Heliobacillus mobilis by 13C Photo-CIDNP MAS NMR}, year={2008}, doi={10.1021/bi800030g}, number={16}, volume={47}, issn={0006-2960}, journal={Biochemistry}, pages={4629--4635}, author={Roy, Esha and Rohmer, Thierry and Gast, Peter and Jeschke, Gunnar and Alia, Alia and Matysik, Jörg} }

Matysik, Jörg Gast, Peter Alia, Alia 2022-09-21T13:23:54Z 2022-09-21T13:23:54Z Photochemically induced dynamic nuclear polarization (photo-CIDNP) has been observed in membrane fragments of heliobacterium Heliobacillus mobilis without further isolation by <sup>13</sup>C magic-angle spinning (MAS) solid-state NMR under continuous illumination with white light. In the <sup>13</sup>C photo-CIDNP MAS NMR spectra of heliobacterial membrane fragments, two sets of signals are observed, allowing characterization of the primary radical pair. One set, showing enhanced absorptive (positive) signals, arises from the BChl g donor, while the set of emissive (negative) signals is assigned to the 81-hydroxy Chl a acceptor. Hence, under these sample conditions, both donor and acceptor sides are either monomeric or composed of identical cofactors. The occurrence of the differential relaxation (DR) mechanism suggests a donor triplet lifetime in the microsecond range. It appears that the occurrence of the solid-state photo-CIDNP effect is a general feature of primary radical pairs in natural photosynthesis. Roy, Esha Jeschke, Gunnar Gast, Peter eng Rohmer, Thierry Roy, Esha 2008-04-22 Characterization of the Primary Radical Pair in Reaction Centers of Heliobacillus mobilis by <sup>13</sup>C Photo-CIDNP MAS NMR Jeschke, Gunnar Rohmer, Thierry Alia, Alia Matysik, Jörg

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