Structure of the membrane-bound protein photosynthetic reaction center from Rhodobacter sphaeroides.
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Chang CH, el-Kabbani O, Tiede D, Norris J, Schiffer M
Structure of the membrane-bound protein photosynthetic reaction center from Rhodobacter sphaeroides.
Biochemistry. 1991 Jun 4;30(22):5352-60.
- PubMed ID
- 2036404 [ View in PubMed]
- Abstract
The structure of the photosynthetic reaction center (RC) from Rhodobacter sphaeroides was determined at 3.1-A 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 Fe2+, 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.