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Step-Scan FT-IR Spectroscopy of Electron Transfer in the Photosynthetic Bacterial Reaction Center

Volume 47, Number 9 (Sept. 1993) Page 1401-1404

Burie, J.R.; Leibl, W.; Nabedryk, E.; Breton, J.


Step-scan light-induced FT-IR difference spectra (1800-1200 cm−1) of Rhodobacter sphaeroides photosynthetic bacterial reaction centers at low temperature and with a 10-μs time resolution are presented. The molecular changes and relaxation processes accompanying the photoxidation of the primary electron donor (P) are already present 10 μs after excitation. The photoconversion of P to the triplet state gives rise to characteristic IR absorption changes which decay with a half-time of 130 μs. A negative band at 1695 cm−1 and a positive one at 1670 cm−1 are assigned to the 9-keto carbonyl of bacteriochlorophyll in the states P and 3P, respectively.