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 · Thu Jun 01 00:00:00 EDT 1989 · Proceedings of the National Academy of Sciences of the United States of America; (USA)

DOI:https://doi.org/10.1073/pnas.86.12.4335· OSTI ID:5441618

Norris, J R; Budil, D E; Gast, P; Chang, C H; El-Kabbani, O; Schiffer, M ^[1]

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1. 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-31-109-ENG-38
• OSTI ID: 5441618
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America; (USA), Vol. 86:12; ISSN 0027-8424
• Country of Publication: United States
• Language: English

Related Subjects

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-)