Abstract
Subpicosecond oscillations in the B (accessory bacteriochlorophylls) band were found in native and BB-modified reaction centers from Rhodobacter sphaeroides R26 and of the mutant YM210W at 293 K using 30 fs excitation pulses at 865 nm. The (30 ± 3) and (12 ± 2) cm-1 modes were found to be enhanced with respect to the broad structure around 150 cm-1 in all reaction centers (RC). The maximal amplitude of both modes is observed in native and BB-modified RCs, while their minimal amplitude is registered in the YM210W mutant, in which the rate of ET is significantly decreased. In the presence of QA2- new modes at 50 and 95 cm-1 are observed, concomitant with a decrease of the 30 cm-1 mode. These results are discussed in terms of the influence of protein motions, induced by the excitation of P, on the QY transition of BA at 800 nm and their relation to the primary electron transfer.
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