Light-induced Fourier transform infrared (FTIR) spectroscopic investigations of the primary donor oxidation in bacterial photosynthesis

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Abstract

Fourier transform infrared (FTIR) difference spectroscopy of the primary electron donor (P) photo-oxidation has been performed for reaction centers (RCs) and chromatophores of purple photosynthetic bacteria. In the 1800-650 cm-1spectral region highly reproducible absorbance changes were obtained that can be related to specific changes of individual bond absorption. Several bands in the difference spectra are tentatively assigned to changes of intensity and position of the keto and ester CO vibrations of the P bacteriochlorophylls, and a possible interpretation in terms of changes of their environment or type of bonding to the protein is given. Small difference bands in the amide I and II region allow only minor protein conformational changes. © 1985.

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Mäntele, W., Nabedryk, E., Tavitian, B. A., Kreutz, W., & Breton, J. (1985). Light-induced Fourier transform infrared (FTIR) spectroscopic investigations of the primary donor oxidation in bacterial photosynthesis. FEBS Letters, 187(2), 227–232. https://doi.org/10.1016/0014-5793(85)81247-3

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