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Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Chemical oxidation of the FMO antenna protein from Chlorobaculum tepidum.
Photosynthesis Research 2013 September
Effect of chemical oxidation by ferricyanide on bacteriochlorophyll a (BChl a) in the Fenna-Matthews-Olson protein (FMO) was studied using absorbance and fluorescence spectroscopy at ambient and cryogenic temperatures. Partially selective oxidation of pigments bound to the antenna complex was achieved and the probable absorption wavelength corresponding to the recently discovered bacteriochlorophyll No. 8 of 806 nm was obtained by comparative analysis of the effect of chemical oxidation and the effect of different isolation procedures. Formation of a stable product identified as a chlorophyll a derivative occurred upon chemical oxidation. This new pigment remained bound within the pigment-protein complex, and exhibited an efficient energy transfer to BChl a. Furthermore, complex effects of the pigment oxidation upon the fluorescence yield of the FMO protein were observed. Utility of this approach based on chemical modifications for the investigation of the native regulatory mechanisms involved in the energy transfer in the FMO protein is discussed.
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