Model studies of low-temperature optical transitions of photosynthetic reaction centers A-, LD-, CD-, ADMR- and LD-ADMR-spectra for Rhodopseudomonas viridis

E. W. Knapp; P. O.J. Scherer; S. F. Fischer

doi:10.1016/0005-2728(86)90235-5

Model studies of low-temperature optical transitions of photosynthetic reaction centers A-, LD-, CD-, ADMR- and LD-ADMR-spectra for Rhodopseudomonas viridis

E. W. Knapp, P. O.J. Scherer, S. F. Fischer

TUM Emeriti of Excellence

Technical University of Munich

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

51 Scopus citations

Abstract

The optical spectra of the reaction center (RC) of Rhodopseudomonas viridis including absorption (A), linear dichrosism (LD), circular dichroism (CD), absorption-detected magnetic resonance (ADMR) and its linear dichroism (LD-ADMR) are simulated by an exciton model. It involves the Q_y transitions of six prosthetic groups: four (bacteriochlorophyll-b molecules, two bacteriopheophytin-b molecules and the Soret bands B_y of the special-pair pigments, which couple most strongly with the corresponding Q_y transitions. For the ADMR-spectra additional excitations of the special-pair triplet are introduced. While interactions between the Q_y transitions and the B_y transitions are in principle determined from the structural arrangement of the pigments, the interactions to the other states are adjusted to fit the spectral features for the various transitions. The interaction of the newly introduced states are interpreted in terms of a simple model.

Original language	English
Pages (from-to)	295-305
Number of pages	11
Journal	BBA - Bioenergetics
Volume	852
Issue number	2-3
DOIs	https://doi.org/10.1016/0005-2728(86)90235-5
State	Published - 3 Dec 1986

Keywords

(Rps. viridis)
ADMR
Pigment orientation
Polarized spectroscopy
Reaction center
Triplet state

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10.1016/0005-2728(86)90235-5

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title = "Model studies of low-temperature optical transitions of photosynthetic reaction centers A-, LD-, CD-, ADMR- and LD-ADMR-spectra for Rhodopseudomonas viridis",

abstract = "The optical spectra of the reaction center (RC) of Rhodopseudomonas viridis including absorption (A), linear dichrosism (LD), circular dichroism (CD), absorption-detected magnetic resonance (ADMR) and its linear dichroism (LD-ADMR) are simulated by an exciton model. It involves the Qy transitions of six prosthetic groups: four (bacteriochlorophyll-b molecules, two bacteriopheophytin-b molecules and the Soret bands By of the special-pair pigments, which couple most strongly with the corresponding Qy transitions. For the ADMR-spectra additional excitations of the special-pair triplet are introduced. While interactions between the Qy transitions and the By transitions are in principle determined from the structural arrangement of the pigments, the interactions to the other states are adjusted to fit the spectral features for the various transitions. The interaction of the newly introduced states are interpreted in terms of a simple model.",

keywords = "(Rps. viridis), ADMR, Pigment orientation, Polarized spectroscopy, Reaction center, Triplet state",

author = "Knapp, {E. W.} and Scherer, {P. O.J.} and Fischer, {S. F.}",

note = "Funding Information: sions. One of us (S.F.F.) likes to thank Prof. A.J. Hoff for several stimulating discussions. We also thank Prof. J. Breton and Dr. A. Scherz for helpful discussions and supplying experimental data prior to publication. E.W.K. acknowledges financial support by a Heisenberg fellowship. This work is supported by the Deutsche Forschungsge-meinschaft DFG (SFB 143/C2).",

year = "1986",

month = dec,

day = "3",

doi = "10.1016/0005-2728(86)90235-5",

language = "English",

volume = "852",

pages = "295--305",

journal = "BBA - Bioenergetics",

issn = "0005-2728",

publisher = "Elsevier B.V.",

number = "2-3",

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T1 - Model studies of low-temperature optical transitions of photosynthetic reaction centers A-, LD-, CD-, ADMR- and LD-ADMR-spectra for Rhodopseudomonas viridis

AU - Knapp, E. W.

AU - Scherer, P. O.J.

AU - Fischer, S. F.

N1 - Funding Information: sions. One of us (S.F.F.) likes to thank Prof. A.J. Hoff for several stimulating discussions. We also thank Prof. J. Breton and Dr. A. Scherz for helpful discussions and supplying experimental data prior to publication. E.W.K. acknowledges financial support by a Heisenberg fellowship. This work is supported by the Deutsche Forschungsge-meinschaft DFG (SFB 143/C2).

PY - 1986/12/3

Y1 - 1986/12/3

N2 - The optical spectra of the reaction center (RC) of Rhodopseudomonas viridis including absorption (A), linear dichrosism (LD), circular dichroism (CD), absorption-detected magnetic resonance (ADMR) and its linear dichroism (LD-ADMR) are simulated by an exciton model. It involves the Qy transitions of six prosthetic groups: four (bacteriochlorophyll-b molecules, two bacteriopheophytin-b molecules and the Soret bands By of the special-pair pigments, which couple most strongly with the corresponding Qy transitions. For the ADMR-spectra additional excitations of the special-pair triplet are introduced. While interactions between the Qy transitions and the By transitions are in principle determined from the structural arrangement of the pigments, the interactions to the other states are adjusted to fit the spectral features for the various transitions. The interaction of the newly introduced states are interpreted in terms of a simple model.

AB - The optical spectra of the reaction center (RC) of Rhodopseudomonas viridis including absorption (A), linear dichrosism (LD), circular dichroism (CD), absorption-detected magnetic resonance (ADMR) and its linear dichroism (LD-ADMR) are simulated by an exciton model. It involves the Qy transitions of six prosthetic groups: four (bacteriochlorophyll-b molecules, two bacteriopheophytin-b molecules and the Soret bands By of the special-pair pigments, which couple most strongly with the corresponding Qy transitions. For the ADMR-spectra additional excitations of the special-pair triplet are introduced. While interactions between the Qy transitions and the By transitions are in principle determined from the structural arrangement of the pigments, the interactions to the other states are adjusted to fit the spectral features for the various transitions. The interaction of the newly introduced states are interpreted in terms of a simple model.

KW - (Rps. viridis)

KW - ADMR

KW - Pigment orientation

KW - Polarized spectroscopy

KW - Reaction center

KW - Triplet state

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SN - 0005-2728

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JO - BBA - Bioenergetics

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IS - 2-3

ER -

Model studies of low-temperature optical transitions of photosynthetic reaction centers A-, LD-, CD-, ADMR- and LD-ADMR-spectra for Rhodopseudomonas viridis

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