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

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 ligh...

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Bibliographic Details
Main Authors: Nagy László
Kiss Vladimir
Brumfeld Vlad
Osvay Károly
Börzsönyi Ádám
Magyar Melinda
Szabó Tibor
Dorogi Márta
Malkin Shmuel
Format: Article
Published: 2015
Series:PHOTOCHEMISTRY AND PHOTOBIOLOGY 91 No. 6
Subjects:
doi:10.1111/php.12511

mtmt:2951254
Online Access:http://publicatio.bibl.u-szeged.hu/27376
Description
Summary: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.
Physical Description:1368-1375
ISSN:0031-8655