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
Journal Article
·
· Proceedings of the National Academy of Sciences of the United States of America; (USA)
- Argonne National Laboratory, IL (USA)
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.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5441618
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America; (USA), Journal Name: Proceedings of the National Academy of Sciences of the United States of America; (USA) Vol. 86:12; ISSN 0027-8424; ISSN PNASA
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:5139099
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Related Subjects
14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
BACTERIA
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTALLOGRAPHY
DIFFRACTION
ELECTRON SPIN RESONANCE
MAGNETIC RESONANCE
MAGNETISM
MICROORGANISMS
MOLECULAR STRUCTURE
PARAMAGNETISM
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC REACTION CENTERS
RESONANCE
RHODOPSEUDOMONAS
SCATTERING
SYMMETRY
SYNTHESIS
X-RAY DIFFRACTION
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
BACTERIA
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTALLOGRAPHY
DIFFRACTION
ELECTRON SPIN RESONANCE
MAGNETIC RESONANCE
MAGNETISM
MICROORGANISMS
MOLECULAR STRUCTURE
PARAMAGNETISM
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC REACTION CENTERS
RESONANCE
RHODOPSEUDOMONAS
SCATTERING
SYMMETRY
SYNTHESIS
X-RAY DIFFRACTION