PMID: 9658021Jul 11, 1998Paper

Diversity of cytochrome bc complexes: example of the Rieske protein in green sulfur bacteria

Journal of Bacteriology
M BrugnaW Nitschke

Abstract

The Rieske 2Fe2S cluster of Chlorobium limicola forma thiosulfatophilum strain tassajara was studied by electron paramagnetic resonance spectroscopy. Two distinct orientations of its g tensor were observed in oriented samples corresponding to differing conformations of the protein. Only one of the two conformations persisted after treatment with 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone. A redox midpoint potential (Em) of +160 mV in the pH range of 6 to 7.7 and a decreasing Em (-60 to -80 mV/pH unit) above pH 7.7 were found. The implications of the existence of differing conformational states of the Rieske protein, as well as of the shape of its Em-versus-pH curve, in green sulfur bacteria are discussed.

References

May 14, 1976·Biochimica Et Biophysica Acta·D B Knaff, R Malkin
Apr 8, 1969·Biochimica Et Biophysica Acta·R Powls, E R Redfearn
Jul 15, 1994·Biochemical and Biophysical Research Communications·S AnemüllerM Teixeira
Jan 1, 1994·Journal of Bacteriology·G J OlsenR Overbeek
May 16, 1998·Nature·Z ZhangS H Kim

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Citations

Feb 19, 2000·Proceedings of the National Academy of Sciences of the United States of America·M BrugnaI Sinning
Aug 31, 2000·Annual Review of Biochemistry·E A BerryA R Crofts
Aug 22, 2020·Chemical Reviews·Frederic Melin, Petra Hellwig
Jan 14, 2004·Biochemistry·Michael K BowmanDavid M Kramer
Jul 13, 2000·Journal of Molecular Biology·M SchützW Nitschke

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