PMID: 6968221Oct 3, 1980Paper

Subpicosecond and picosecond studies of electron transfer intermediates in Rhodopseudomonas sphaeroides reaction centers

Biochimica Et Biophysica Acta
D HoltenC V Shank

Abstract

The primary electron transfer processes in isolated reaction centers of Rhodopseudomonas sphaeroides have been investigated with subpicosecond and picosecond spectroscopic techniques. Spectra and kinetics of the absorbance changes following excitation with 0.7-ps 610-nm pulses, absorbed predominantly by bacteriochlorophyll (BChl), indicate that the radical pair state P+BPh-, in which an electron has been transferred from the BChl dimer (P) to a bacteriopheophytin (BPh), is formed with a time constant no greater than 4 ps. The initial absorbance changes also reveal an earlier state, which could be an excited singlet state, or a P+BChl- radical pair. The bleaching at 870 nm produced by 7 ps excitation at 530 nm (absorbed by BPh) or at 600 nm (absorbed predominantly by BChl) shows no resolvable delay with respect to standard compounds in solution, suggesting that the time for energy transfer from BPh to P is less than 7 ps. However, the bleaching in the BPh band at 545 nm following 7-ps 600-nm excitation, exhibits an 8- to 10-ps lag with respect to standard compounds. This finding is qualitatively similar to the 35-ps delay previously observed at 760 nm by Shuvalov at al. (Shuvalov, V.A., Klevanik, A.V., Sharkov, A.V., Matveetz, Y...Continue Reading

References

Apr 15, 1975·Annals of the New York Academy of Sciences·G FeherL C Ackerson
Jan 11, 1978·Biochimica Et Biophysica Acta·D HoltenJ P Thornber
May 15, 1975·Biochimica Et Biophysica Acta·W W ParsonR J Cogdell
Jun 1, 1975·Proceedings of the National Academy of Sciences of the United States of America·M G RockleyW W Parson
Jun 7, 1976·Biochemical and Biophysical Research Communications·K J KaufmannP M Rentzepis
Jun 1, 1976·Photochemistry and Photobiology·D HoltenM G Rockley
Apr 5, 1973·Biochimica Et Biophysica Acta·J C Goedheer
Mar 1, 1971·Proceedings of the National Academy of Sciences of the United States of America·J R NorrisJ J Katz

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Citations

Sep 1, 1987·Photosynthesis Research·C Kirmaier, D Holten
Jul 15, 1984·Experientia·J L Dreyer
Aug 1, 1989·Quarterly Reviews of Biophysics·A R Holzwarth
May 1, 1984·Quarterly Reviews of Biophysics·A J Hoff
Feb 1, 1981·Proceedings of the National Academy of Sciences of the United States of America·V A Shuvalov, W W Parson
Mar 1, 1982·Proceedings of the National Academy of Sciences of the United States of America·R Friesner, R Wertheimer
Jul 1, 1986·Proceedings of the National Academy of Sciences of the United States of America·J BretonA Orszag
Jul 1, 1990·Proceedings of the National Academy of Sciences of the United States of America·W HolzapfelW Zinth
Dec 1, 1984·Photochemistry and Photobiology·J W Petrich, G R Fleming
Nov 21, 2013·Photosynthesis Research·Colin A Wraight
Jan 3, 2012·Biochimica Et Biophysica Acta·R A KhatypovV A Shuvalov
Mar 1, 1986·Environmental Health Perspectives·P O Ganrot
Nov 26, 1984·Biochimica Et Biophysica Acta·N W Woodbury, W W Parson

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