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Title: Correlation of paramagnetic states and molecular structure in bacterial photosynthetic reaction centers: The symmetry of the primary electron donor in Rhodopseudomonas viridis and Rhodobacter sphaeroides R-26

Abstract

The orientation of the principal axes of the primary electron donor triplet state measured in single crystals of photosynthetic reaction centers is compared to the x-ray structures of the bacteria Rhodobacter (Rb.) sphaeroides R-26 and Rhodopseudomonas (Rps.) viridis. The primary donor of Rps. viridis is significantly different from that of Rb. sphaeroides. The measured directions of the axes indicate that triplet excitation is almost completely localized on the L-subunit half of the dimer in Rps. viridis but is more symmetrically distributed on the dimeric donor in Rb. sphaeroides R-26. The large reduction of the zero field splitting parameters relative to monomeric bacteriochlorophyll triplet in vitro suggests significant participation of asymmetrical charge transfer electronic configurations in the special pair triplet state of both organisms.

Authors:
; ; ; ; ;  [1]
  1. (Argonne National Laboratory, IL (USA))
Publication Date:
OSTI Identifier:
5441618
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Journal Article
Resource Relation:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America; (USA); Journal Volume: 86:12
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; 14 SOLAR ENERGY; PHOTOSYNTHETIC BACTERIA; PHOTOSYNTHESIS; PHOTOSYNTHETIC REACTION CENTERS; MOLECULAR STRUCTURE; CRYSTALLOGRAPHY; ELECTRON SPIN RESONANCE; PARAMAGNETISM; RHODOPSEUDOMONAS; SYMMETRY; X-RAY DIFFRACTION; BACTERIA; CHEMICAL REACTIONS; COHERENT SCATTERING; DIFFRACTION; MAGNETIC RESONANCE; MAGNETISM; MICROORGANISMS; PHOTOCHEMICAL REACTIONS; RESONANCE; SCATTERING; SYNTHESIS; 550602* - Medicine- External Radiation in Diagnostics- (1980-); 140505 - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-)

Citation Formats

Norris, J.R., Budil, D.E., Gast, P., Chang, C.H., El-Kabbani, O., and Schiffer, M.. Correlation of paramagnetic states and molecular structure in bacterial photosynthetic reaction centers: The symmetry of the primary electron donor in Rhodopseudomonas viridis and Rhodobacter sphaeroides R-26. United States: N. p., 1989. Web. doi:10.1073/pnas.86.12.4335.
Norris, J.R., Budil, D.E., Gast, P., Chang, C.H., El-Kabbani, O., & Schiffer, M.. Correlation of paramagnetic states and molecular structure in bacterial photosynthetic reaction centers: The symmetry of the primary electron donor in Rhodopseudomonas viridis and Rhodobacter sphaeroides R-26. United States. doi:10.1073/pnas.86.12.4335.
Norris, J.R., Budil, D.E., Gast, P., Chang, C.H., El-Kabbani, O., and Schiffer, M.. Thu . "Correlation of paramagnetic states and molecular structure in bacterial photosynthetic reaction centers: The symmetry of the primary electron donor in Rhodopseudomonas viridis and Rhodobacter sphaeroides R-26". United States. doi:10.1073/pnas.86.12.4335.
@article{osti_5441618,
title = {Correlation of paramagnetic states and molecular structure in bacterial photosynthetic reaction centers: The symmetry of the primary electron donor in Rhodopseudomonas viridis and Rhodobacter sphaeroides R-26},
author = {Norris, J.R. and Budil, D.E. and Gast, P. and Chang, C.H. and El-Kabbani, O. and Schiffer, M.},
abstractNote = {The orientation of the principal axes of the primary electron donor triplet state measured in single crystals of photosynthetic reaction centers is compared to the x-ray structures of the bacteria Rhodobacter (Rb.) sphaeroides R-26 and Rhodopseudomonas (Rps.) viridis. The primary donor of Rps. viridis is significantly different from that of Rb. sphaeroides. The measured directions of the axes indicate that triplet excitation is almost completely localized on the L-subunit half of the dimer in Rps. viridis but is more symmetrically distributed on the dimeric donor in Rb. sphaeroides R-26. The large reduction of the zero field splitting parameters relative to monomeric bacteriochlorophyll triplet in vitro suggests significant participation of asymmetrical charge transfer electronic configurations in the special pair triplet state of both organisms.},
doi = {10.1073/pnas.86.12.4335},
journal = {Proceedings of the National Academy of Sciences of the United States of America; (USA)},
number = ,
volume = 86:12,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 1989},
month = {Thu Jun 01 00:00:00 EDT 1989}
}