Abstract
The triplet state EPR spectra of magnetically aligned whole cells of Rhodopseudomonas viridis and Rhodopseudomonas palustris display a marked dependence on the orientation of the static EPR field with respect to the alignment field direction. This observation implies that the primary donor species on which the triplets are localized are ordered within the membranes. We have developed a theoretical model for the system to enable calculation of the orientation of the magnetic axes of the primary donor species with respect to the membranes in which they reside. The triplet state spectra are generated by an ensemble of partially ordered magnetic systems and a computer simulation of the experimental results. The triplet orientation is very similar for the two organisms studied, where one axis lies predominantly in the plane of the membrane and the other two axes have approximately equal projections onto the normal to the membrane.
| Original language | English |
|---|---|
| Pages (from-to) | 484-501 |
| Number of pages | 18 |
| Journal | Biochimica et Biophysica Acta - Bioenergetics |
| Volume | 547 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Sep 11 1979 |
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Keywords
- (EPR)
- Bacterial photosynthesis
- Reaction center
- Triplet state
ASJC Scopus subject areas
- Biophysics
- Medicine(all)
Cite this
The orientation of the primary donor in bacterial photosynthesis. / Frank, Harry A.; Friesner, Richard; Nairn, John A.; Dismukes, G Charles; Sauer, Kenneth.
In: Biochimica et Biophysica Acta - Bioenergetics, Vol. 547, No. 3, 11.09.1979, p. 484-501.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The orientation of the primary donor in bacterial photosynthesis
AU - Frank, Harry A.
AU - Friesner, Richard
AU - Nairn, John A.
AU - Dismukes, G Charles
AU - Sauer, Kenneth
PY - 1979/9/11
Y1 - 1979/9/11
N2 - The triplet state EPR spectra of magnetically aligned whole cells of Rhodopseudomonas viridis and Rhodopseudomonas palustris display a marked dependence on the orientation of the static EPR field with respect to the alignment field direction. This observation implies that the primary donor species on which the triplets are localized are ordered within the membranes. We have developed a theoretical model for the system to enable calculation of the orientation of the magnetic axes of the primary donor species with respect to the membranes in which they reside. The triplet state spectra are generated by an ensemble of partially ordered magnetic systems and a computer simulation of the experimental results. The triplet orientation is very similar for the two organisms studied, where one axis lies predominantly in the plane of the membrane and the other two axes have approximately equal projections onto the normal to the membrane.
AB - The triplet state EPR spectra of magnetically aligned whole cells of Rhodopseudomonas viridis and Rhodopseudomonas palustris display a marked dependence on the orientation of the static EPR field with respect to the alignment field direction. This observation implies that the primary donor species on which the triplets are localized are ordered within the membranes. We have developed a theoretical model for the system to enable calculation of the orientation of the magnetic axes of the primary donor species with respect to the membranes in which they reside. The triplet state spectra are generated by an ensemble of partially ordered magnetic systems and a computer simulation of the experimental results. The triplet orientation is very similar for the two organisms studied, where one axis lies predominantly in the plane of the membrane and the other two axes have approximately equal projections onto the normal to the membrane.
KW - (EPR)
KW - Bacterial photosynthesis
KW - Reaction center
KW - Triplet state
UR - http://www.scopus.com/inward/record.url?scp=0018697543&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0018697543&partnerID=8YFLogxK
U2 - 10.1016/0005-2728(79)90029-X
DO - 10.1016/0005-2728(79)90029-X
M3 - Article
VL - 547
SP - 484
EP - 501
JO - Biochimica et Biophysica Acta - Bioenergetics
JF - Biochimica et Biophysica Acta - Bioenergetics
SN - 0005-2728
IS - 3
ER -