Structure of the membrane-bound protein photosynthetic reaction center from Rhodobacter sphaeroides
- Argonne National Lab., IL (United States)
The structure of the photosynthetic reaction center (RC) from Rhodobacter sphaeroides was determined at 3.1-{angstrom} resolution by the molecular replacement method, using the Rhodopseudomonas viridis RC as the search structure. Atomic coordinates were refined with the difference Fourier method and restrained least-squares refinement techniques to a current R factor of 22%. The tertiary structure of the RC complex is stabilized by hydrophobic interactions between the L and M chains, by interactions of the pigments with each other and with the L and M chains, by residues from the L and M chains that coordinate to the Fe{sup 2+}, by salt bridges that are formed between the L and M chains and the H chain, and possibly by electrostatic forces between the ends of helices. The conserved residues at the N-termini of the L and M chains were identified as recognition sites for the H chain.
- OSTI ID:
- 5110884
- Journal Information:
- Biochemistry; (United States), Journal Name: Biochemistry; (United States) Vol. 30:22; ISSN 0006-2960; ISSN BICHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
FOURIER ANALYSIS
LEAST SQUARE FIT
MAXIMUM-LIKELIHOOD FIT
MEMBRANE PROTEINS
MEMBRANES
MOLECULAR STRUCTURE
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC MEMBRANES
PHOTOSYNTHETIC REACTION CENTERS
PROTEINS
STEREOCHEMISTRY