{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T11:37:03Z","timestamp":1773661023649,"version":"3.50.1"},"reference-count":87,"publisher":"World Scientific Pub Co Pte Lt","issue":"04","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Bioinform. Comput. Biol."],"published-print":{"date-parts":[[2008,8]]},"abstract":"<jats:p> Transient absorption difference spectroscopy with ~20 femtosecond (fs) resolution was applied to study the time and spectral evolution of low-temperature (90 K) absorbance changes in isolated reaction centers (RCs) of Chloroflexus (C.) aurantiacus. In RCs, the composition of the B-branch chromophores is different with respect to that of purple bacterial RCs by occupying the B<jats:sub>B<\/jats:sub> binding site of accessory bacteriochlorophyll by bacteriopheophytin molecule (\u03a6<jats:sub>B<\/jats:sub>). It was found that the nuclear wave packet motion induced on the potential energy surface of the excited state of the primary electron donor P* by ~20 fs excitation leads to a coherent formation of the states [Formula: see text] and [Formula: see text] (B<jats:sub>A<\/jats:sub> is a bacteriochlorophyll monomer in the A-branch of cofactors). The processes were studied by measuring coherent oscillations in kinetics of the absorbance changes at 900 nm and 940 nm (P* stimulated emission), at 750 nm and 785 nm (\u03a6<jats:sub>B<\/jats:sub> absorption bands), and at 1,020\u20131028 nm ([Formula: see text] absorption band). In RCs, the immediate bleaching of the P band at 880 nm and the appearance of the stimulated wave packet emission at 900 nm were accompanied (with a small delay of 10\u201320 fs) by electron transfer from P* to the B-branch with bleaching of the \u03a6<jats:sub>B<\/jats:sub> absorption band at 785 nm due to [Formula: see text] formation. These data are consistent with recent measurements for the mutant HM182L Rb. sphaeroides RCs (Yakovlev et al., Biochim Biophys Acta1757:369\u2013379, 2006). Only at a delay of 120 fs was the electron transfer from P* to the A-branch observed with a development of the [Formula: see text] absorption band at 1028 nm. This development was in phase with the appearance of the P* stimulated emission at 940 nm. The data on the A-branch electron transfer in C. aurantiacus RCs are consistent with those observed in native RCs of Rb. sphaeroides. The mechanism of charge separation in RCs with the modified B-branch pigment composition is discussed in terms of coupling between the nuclear wave packet motion and electron transfer from P* to \u03a6<jats:sub>B<\/jats:sub> and B<jats:sub>A<\/jats:sub> primary acceptors in the B-branch and A-branch, respectively. <\/jats:p>","DOI":"10.1142\/s0219720008003680","type":"journal-article","created":{"date-parts":[[2008,9,2]],"date-time":"2008-09-02T11:01:05Z","timestamp":1220353265000},"page":"643-666","source":"Crossref","is-referenced-by-count":8,"title":["WAVE PACKET MOTIONS COUPLED TO ELECTRON TRANSFER IN REACTION CENTERS OF <i>CHLOROFLEXUS AURANTIACUS<\/i>"],"prefix":"10.1142","volume":"06","author":[{"given":"ANDREI G.","family":"YAKOVLEV","sequence":"first","affiliation":[{"name":"Department of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow 119991, Russian Federation"}]},{"given":"TATIANA A.","family":"SHKUROPATOVA","sequence":"additional","affiliation":[{"name":"Department of Biophysics, Huygens Laboratory, Leiden University, P.O. 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