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

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2008
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Roy, Esha
Rohmer, Thierry
Gast, Peter
Alia, Alia
Matysik, Jörg
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Biochemistry. American Chemical Society (ACS). 2008, 47(16), pp. 4629-4635. ISSN 0006-2960. eISSN 1520-4995. Available under: doi: 10.1021/bi800030g
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Photochemically induced dynamic nuclear polarization (photo-CIDNP) has been observed in membrane fragments of heliobacterium Heliobacillus mobilis without further isolation by 13C magic-angle spinning (MAS) solid-state NMR under continuous illumination with white light. In the 13C 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.

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ISO 690ROY, 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). 2008, 47(16), pp. 4629-4635. ISSN 0006-2960. eISSN 1520-4995. Available under: doi: 10.1021/bi800030g
BibTex
@article{Roy2008-04-22Chara-58673,
  year={2008},
  doi={10.1021/bi800030g},
  title={Characterization of the Primary Radical Pair in Reaction Centers of Heliobacillus mobilis by <sup>13</sup>C Photo-CIDNP MAS NMR},
  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}
}
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    <dcterms:abstract xml:lang="eng">Photochemically induced dynamic nuclear polarization (photo-CIDNP) has been observed in membrane fragments of heliobacterium Heliobacillus mobilis without further isolation by &lt;sup&gt;13&lt;/sup&gt;C magic-angle spinning (MAS) solid-state NMR under continuous illumination with white light. In the &lt;sup&gt;13&lt;/sup&gt;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.</dcterms:abstract>
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