Whole cell nuclear magnetic resonance characterization of two photochemically active states of the photosynthetic reaction center in heliobacteria

Smitha Surendran Thamarath, A. Alia, Eugenio Daviso, Deni Mance, John H. Golbeck, Jörg Matysik

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Applying photo-CIDNP (photochemically induced dynamic nuclear polarization) MAS (magic-angle spinning) nuclear magnetic resonance to whole cells of Heliobacillus (Hb.) mobilis, we demonstrate that heliobacterial reaction centers are operational in two different states as indicated by the occurrence of a light-induced spin-correlated radical pair. A culture maintained anaerobically is called "Braunstoff" (German for "brown substance"). After exposure to oxygen, Braunstoff is converted to "Grünstoff" ("green substance") as indicated by a color change due to the conversion of BChl g to Chl aF. It is shown that electron transfer occurs symmetrically via both branches of cofactors in both forms. The donor and acceptor cofactors remain identical and unchanged upon conversion, while the intermediate accessory cofactors are transformed from BChl g to Chl a F. The donor triplet state in Braunstoff is localized on the special pair donor and lives for 100 μs, demonstrating the absence of nearby carotenoids. In Grünstoff, the donor triplet becomes mobile and appears to be formed on an accessory cofactor.

Original languageEnglish (US)
Pages (from-to)5763-5773
Number of pages11
JournalBiochemistry
Volume51
Issue number29
DOIs
StatePublished - Jul 24 2012

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Photosynthetic Reaction Center Complex Proteins
Accessories
Carotenoids
Magnetic Resonance Spectroscopy
Color
Nuclear magnetic resonance
Electrons
Oxygen
Light
Magic angle spinning
Polarization

All Science Journal Classification (ASJC) codes

  • Biochemistry

Cite this

Thamarath, Smitha Surendran ; Alia, A. ; Daviso, Eugenio ; Mance, Deni ; Golbeck, John H. ; Matysik, Jörg. / Whole cell nuclear magnetic resonance characterization of two photochemically active states of the photosynthetic reaction center in heliobacteria. In: Biochemistry. 2012 ; Vol. 51, No. 29. pp. 5763-5773.
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Whole cell nuclear magnetic resonance characterization of two photochemically active states of the photosynthetic reaction center in heliobacteria. / Thamarath, Smitha Surendran; Alia, A.; Daviso, Eugenio; Mance, Deni; Golbeck, John H.; Matysik, Jörg.

In: Biochemistry, Vol. 51, No. 29, 24.07.2012, p. 5763-5773.

Research output: Contribution to journalArticle

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