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

Research output: Contribution to journalArticlepeer-review

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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.

Original languageEnglish
Pages (from-to)295-305
Number of pages11
JournalBBA - Bioenergetics
Volume852
Issue number2-3
DOIs
StatePublished - 3 Dec 1986

Keywords

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

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