Thermal Effects and Structural Changes of Photosynthetic Reaction Centers Characterized by Wide Frequency Band Hydrophone: Effects of Carotenoids and Terbutryn

Lászlõ Nagy, Vladimir Kiss, Vlad Brumfeld, Károly Osvay, Ádám Börzsönyi, Melinda Magyar, Tibor Szabõ, Márta Dorogi, Shmuel Malkin

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Photothermal characteristics and light-induced structural (volume) changes of carotenoid-containing and noncontaining photosynthetic reaction centers (RCs) were investigated by wide frequency band hydrophone. We found that the presence of carotenoid either does not play considerable role in the light-induced conformational movements, or these rearrangements are too slow for inducing a photoacoustic (PA) signal. The kinetic component with a few tens of microseconds, exhibited by the carotenoid-less RCs, appears to be similar to that of triplet state lifetimes, identified by other methods. The binding of terbutryn to the acceptor side is shown to affect the dynamics of the RC. Our results do not confirm large displacements or volume changes induced by the charge movements and by the charge relaxation processes in the RCs in few hundreds of microseconds time scale that accompanies the electron transfer between the primary and secondary electron acceptor quinones.

Original languageEnglish
Pages (from-to)1368-1375
Number of pages8
JournalPhotochemistry and photobiology
Issue number6
Publication statusPublished - Nov 1 2015


ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry

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