NMR paper Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.

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[NMR paper] Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.

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06-07-2013, 10:04 AM

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Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.

Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.

Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.

J Am Chem Soc. 2013 Jun 6;

Authors: Sai Sankar Gupta KB, Alia A, de Groot HJ, Matysik J

Abstract
Despite the high structural symmetry of cofactor arrangement and protein environment, light-induced electron transfer in photosynthetic reaction centers (RCs) of the purple bacterium Rhodobacter (R.) sphaeroides runs selectively over one of the two branches of cofactors. The origin of this functional symmetry break is debated since several decades. Recently, a crucial role of the substituents has been proposed by theoretical studies [H. Yamasaki, Y. Takano, H. Nakamura (2008) J. Phys. Chem. B 112, 13923-13933]. Photo-CIDNP (photochemically induced dynamic nuclear polarization) MAS (magic angle spinning) NMR demonstrates that indeed the peripheral atoms show opposite electronic effects on both sides of the special pair. While the aromatic system of PL receives electron density from its periphery, the electron density of the aromatic ring of PM is decreased.

PMID: 23738868 [PubMed - as supplied by publisher]

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