Generation of ion-radical chlorophyll states in the light-harvesting antenna and the reaction center of cyanobacterial photosystem I.

Photosynthesis Research
Dmitry A CherepanovVictor A Nadtochenko

Abstract

The energy and charge-transfer processes in photosystem I (PS I) complexes isolated from cyanobacteria Thermosynechococcus elongatus and Synechocystis sp. PCC 6803 were investigated by pump-to-probe femtosecond spectroscopy. The formation of charge-transfer (CT) states in excitonically coupled chlorophyll a complexes (exciplexes) was monitored by measuring the electrochromic shift of β-carotene in the spectral range 500-510 nm. The excitation of high-energy chlorophyll in light-harvesting antenna of both species was not accompanied by immediate appearance of an electrochromic shift. In PS I from T. elongatus, the excitation of long-wavelength chlorophyll (LWC) caused a pronounced electrochromic effect at 502 nm assigned to the appearance of CT states of chlorophyll exciplexes. The formation of ion-radical pair P700+A1- at 40 ps was limited by energy transfer from LWC to the primary donor P700 and accompanied by carotenoid bleach at 498 nm. In PS I from Synechocystis 6803, the excitation at 720 nm produced an immediate bidentate bleach at 690/704 nm and synchronous carotenoid response at 508 nm. The bidentate bleach was assigned to the formation of primary ion-radical state PB+Chl2B-, where negative charge is localized predomina...Continue Reading

References

Mar 29, 2001·Proceedings of the National Academy of Sciences of the United States of America·M Guergova-KurasK Redding
Nov 1, 2001·Biochimica Et Biophysica Acta·K Brettel, W Leibl
Sep 26, 2003·Biophysical Journal·Krzysztof GibasiewiczAndrew N Webber
Feb 10, 2006·Proceedings of the National Academy of Sciences of the United States of America·Yajing LiKevin Redding
Oct 1, 1970·Proceedings of the National Academy of Sciences of the United States of America·D C BorgD Dolphin
May 17, 2008·Photosynthesis Research·Vasily V PtushenkoAlexey Yu Semenov
Feb 10, 2010·Proceedings of the National Academy of Sciences of the United States of America·Marc G MüllerAlfred R Holzwarth
Mar 12, 2010·Biochimica Et Biophysica Acta·Ivan V ShelaevAlexey Yu Semenov
May 8, 2010·Physical Chemistry Chemical Physics : PCCP·Pavel CháberaTomás Polívka
Mar 1, 2011·Biophysical Journal·Emilie WientjesRoberta Croce
Aug 3, 2011·Biophysical Journal·Emilie WientjesRoberta Croce
Jan 17, 2012·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Sam MulaArt van der Est
Feb 16, 2012·The Journal of Physical Chemistry. B·Adrien ChauvetSergei Savikhin
Apr 2, 2013·Biochimica Et Biophysica Acta·Robert C JenningsStefano Santabarbara

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Citations

Sep 4, 2021·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Dmitry A CherepanovAlexey Yu Semenov

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Methods Mentioned

BETA
fluorescence studies
infrared spectroscopy

Software Mentioned

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