The orientation of the primary donor in bacterial photosynthesis

Harry A. Frank; Richard Friesner; John A. Nairn; G. Charles Dismukes; Kenneth Sauer

doi:10.1016/0005-2728(79)90029-X

The orientation of the primary donor in bacterial photosynthesis

Harry A. Frank, Richard Friesner, John A. Nairn, G. Charles Dismukes, Kenneth Sauer

Rutgers University

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

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	BBA - Bioenergetics
Volume	547
Issue number	3
DOIs	https://doi.org/10.1016/0005-2728(79)90029-X
Publication status	Published - Sep 11 1979

Keywords

(EPR)
Bacterial photosynthesis
Reaction center
Triplet state

ASJC Scopus subject areas

Biophysics
Biochemistry
Cell Biology

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title = "The orientation of the primary donor in bacterial photosynthesis",

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.",

keywords = "(EPR), Bacterial photosynthesis, Reaction center, Triplet state",

author = "Frank, {Harry A.} and Richard Friesner and Nairn, {John A.} and Dismukes, {G. Charles} and Kenneth Sauer",

note = "Funding Information: The authorsw ish to thank Mr. John Bolt and Ms. Mary McLean for their help in the bacteriapl reparationsW. e also gratefullya cknowledgteh e many enthusiastiacn d stimulatindgi scussionws ith Dr. JacquesB reton.T his research was supportedin part by the Biomedicaal ndE nvironmentaRle searchD ivision of the US Departmenotf Energy,b y NationaSl cienceF oundationG rantP CM 76-5074,a NIH NationalR esearchS erviceA wardto H.A.F. and a University of CaliforniaR egentsF ellowshipto J.A.N.",

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doi = "10.1016/0005-2728(79)90029-X",

language = "English",

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AU - Frank, Harry A.

AU - Friesner, Richard

AU - Nairn, John A.

AU - Dismukes, G. Charles

AU - Sauer, Kenneth

N1 - Funding Information: The authorsw ish to thank Mr. John Bolt and Ms. Mary McLean for their help in the bacteriapl reparationsW. e also gratefullya cknowledgteh e many enthusiastiacn d stimulatindgi scussionws ith Dr. JacquesB reton.T his research was supportedin part by the Biomedicaal ndE nvironmentaRle searchD ivision of the US Departmenotf Energy,b y NationaSl cienceF oundationG rantP CM 76-5074,a NIH NationalR esearchS erviceA wardto H.A.F. and a University of CaliforniaR egentsF ellowshipto J.A.N.

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

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The orientation of the primary donor in bacterial photosynthesis

Abstract

Keywords

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