PMID: 6972229Apr 13, 1981Paper

Transient states in reaction centers containing reduced bacteriopheophytin

Biochimica Et Biophysica Acta
C C SchenckM W Windsor

Abstract

Photosynthetic reaction centers isolated from Rhodopseudomonas sphaeroides strain R-26 were excited with non-saturating 7-ps, 600-nm flashes under various conditions, and the resulting absorbance changes were measured. If the quinone electron acceptor (Q) is in the oxidized state, flash excitation generates a transient state (PF), in which an electron has moved from the primary electron donor (P, a dimer of bacteriochlorophylls) to an acceptor complex involving a special bacteriopheophytin (H) and another bacteriochlorophyll (B). PF decays in 200 ps as an electron moves from H to Q and the acceptor complex are reduced photochemically before the excitation, the flash generates a different transient state of P with a high quantum yield. This state decays with a lifetime of 340 ps. There is no indication of electron transfer from P to B under these conditions, but this does not rule out the possibility that B is an intermediate electron carrier between P and H. Measurements of the yield of fluorescence from P under various conditions show that the 340 ps state is not the fluorescent excited singlet state of P. The transient state could be a triplet state, a charge-transfer state of P, or another excited singlet state that is not f...Continue Reading

References

Dec 1, 1975·Proceedings of the National Academy of Sciences of the United States of America·J FajerL D Spaulding
Mar 31, 1975·Biochimica Et Biophysica Acta·W W Parson, R J Cogdell
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
Dec 1, 1968·Proceedings of the National Academy of Sciences of the United States of America·K L ZankelR K Clayton
Jun 1, 1980·Proceedings of the National Academy of Sciences of the United States of America·A Warshel

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Citations

Sep 1, 1987·Photosynthesis Research·C Kirmaier, D Holten
Jul 1, 1990·Proceedings of the National Academy of Sciences of the United States of America·W HolzapfelW Zinth
Jun 12, 2019·Proceedings of the National Academy of Sciences of the United States of America·Nicholas F PolizziMichael J Therien

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