PMID: 11607689Jul 9, 1996Paper

Natural abundance solid-state carbon NMR studies of photosynthetic reaction centers with photoinduced polarization

Proceedings of the National Academy of Sciences of the United States of America
M G Zysmilich, A McDermott

Abstract

Solid-state NMR spectra of natural abundance 13C in reaction centers from photosynthetic bacteria Rhodobacter sphaeroides R-26 was measured. When the quinone acceptors were removed and continuous visible illumination of the sample was provided, exceptionally strong nuclear spin polarization was observed in NMR lines with chemical shifts resembling those of the aromatic carbons in bacteriochlorophyll and bacteriopheophytin. The observation of spin polarized 15N nuclei in bacteriochlorophyll and bacteriopheophytin was previously demonstrated with nonspecifically 15N-labeled reaction centers. Both the carbon and the nitrogen NMR studies indicate that the polarization is developed on species that carry unpaired electrons in the early electron transfer steps, including the bacteriochlorophyll dimer donor P860 and probably the bacteriopheophytin acceptor. I. Both enhanced-absorptive and emissive polarization were seen in the carbon spectrum; most lines were absorptive but the methine carbons of the porphyrin ring (alpha, beta, gamma, ) exhibited emissive polarization. The change in the sign of the hyperfine coupling at these sites indicates the existence of nodes in the spin density distribution on the tetrapyrrole cofactors flanking...Continue Reading

Citations

Feb 25, 2009·Photosynthesis Research·Jörg MatysikA Alia
Dec 19, 2009·Proceedings of the National Academy of Sciences of the United States of America·Eugenio DavisoJörg Matysik
Apr 5, 2011·The Journal of Chemical Physics·Kan-Nian HuRobert G Griffin
Aug 6, 2015·The Journal of Physical Chemistry. B·Wolfgang EisenreichStefan Weber
Mar 24, 2015·Journal of Magnetic Resonance·Christopher P Jaroniec
May 19, 2009·Journal of the American Chemical Society·Philippe S NadaudChristopher P Jaroniec
May 30, 2006·The Journal of Chemical Physics·Anant K Paravastu, Robert Tycko
Oct 14, 2010·Angewandte Chemie·Marie RenaultMarc Baldus
Apr 13, 2021·Applied Magnetic Resonance·Jörg MatysikA Alia
Jul 20, 2011·The Journal of Physical Chemistry. a·Gunnar JeschkeJörg Matysik
Sep 28, 2006·Journal of the American Chemical Society·Shipra PrakashGunnar Jeschke
Oct 13, 2005·Journal of the American Chemical Society·Shipra PrakashJörg Matysik

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