Abstract
The solid-state photo-CIDNP (photochemically induced dynamic nuclear polarization) effect is studied in photosynthetic reaction centers of Heliobacillus mobilis at different magnetic fields by 13C MAS (magic-angle spinning) NMR spectroscopy. Two active states of heliobacterial reaction centers are probed: an anaerobic preparation of heliochromatophores (“Braunstoff”, German for “brown substance”) as well as a preparation of cells after exposure to oxygen (“Grünstoff”, “green substance”). Braunstoff shows significant increase of enhanced absorptive (positive) signals toward lower magnetic fields, which is interpreted in terms of an enhanced differential relaxation (DR) mechanism. In Grünstoff, the signals remain emissive (negative) at two fields, confirming that the influence of the DR mechanism is comparably low.
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Abbreviations
- ALA:
-
Aminolevulinic acid
- BChl:
-
Bacteriochlorophyll
- BPhe:
-
Bacteriopheophytin
- Chl:
-
Chlorophyll
- Chla F :
-
Chlorophyll a with a farnesyl side chain
- CI:
-
Continuous illumination
- DD:
-
Differential decay
- DR:
-
Differential relaxation
- EPR:
-
Electron paramagnetic resonance
- FT-IR:
-
Fourier transform infrared spectroscopy
- Hb. :
-
Heliobacillus
- ISC:
-
Intersystem crossing
- MAS:
-
Magic angle spinning
- NMR:
-
Nuclear magnetic resonance
- P:
-
Special pair primary electron donor
- Photo-CIDNP:
-
Photo-chemically induced dynamic nuclear polarization
- PS I:
-
Photosystem I
- PS II:
-
Photosystem II
- Rb.:
-
Rhodobacter
- RC:
-
Reaction center
- RPM:
-
Radical pair mechanism
- S :
-
Singlet
- T 0 :
-
Triplet
- TPPM:
-
Two-pulse phase-modulation
- TR:
-
Time resolved
- TSM:
-
Electron–electron nuclear three spin mixing
- WT:
-
Wild type
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Acknowledgments
The authors thank to A.H.M de Wit for helping in culturing the bacteria. Helpful discussions with Prof. G. Jeschke and G.J. Janssen are acknowledged. F. Lefeber, K. Erkelens and Bryan Ferlez are gratefully acknowledged. Generous financial support of NWO (818.02.019, 713.012.001) is acknowledged. JHG is supported by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy, via Grant DE-FG02-08ER15989.
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Surendran Thamarath, S., Alia, A., Roy, E. et al. The field-dependence of the solid-state photo-CIDNP effect in two states of heliobacterial reaction centers. Photosynth Res 117, 461–469 (2013). https://doi.org/10.1007/s11120-013-9854-x
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DOI: https://doi.org/10.1007/s11120-013-9854-x