title: Structure of the reaction center from Rhodobacter sphaeroides R-26: the protein subunits.
abstract: The three-dimensional structure of the protein subunits of the reaction center (RC) of Rhodobacter sphaeroides has been determined by x-ray diffraction at a resolution of 2.8 A with an R factor of 26%. The L and M subunits each contain five transmembrane helices and several helices that do not span the membrane. The L and M subunits are related to each other by a 2-fold rotational symmetry axis that is approximately the same as that determined for the cofactors. The H subunit has one transmembrane helix and a globular domain on the cytoplasmic side, which contains a helix that does not span the membrane and several beta-sheets. The structural homology with RCs from other purple bacteria is discussed. A structure of the complex formed between the water soluble cytochrome c2 and the RC from Rb. sphaeroides is proposed.
authors.forename: J P
authors.initials: JP
authors.lastname: Allen
authors.forename: G
authors.initials: G
authors.lastname: Feher
authors.forename: T O
authors.initials: TO
authors.lastname: Yeates
authors.forename: H
authors.initials: H
authors.lastname: Komiya
authors.forename: D C
authors.initials: DC
authors.lastname: Rees
mesh_terms: D001426:Bacterial Proteins; D003574:Cytochrome c Group; D045362:Cytochromes c2; D008958:Models, Molecular; D045322:Photosynthetic Reaction Center Complex Proteins; D011487:Protein Conformation; D012242:Rhodobacter sphaeroides; D013045:Species Specificity
chemical_list: D001426:Bacterial Proteins; D003574:Cytochrome c Group; D045322:Photosynthetic Reaction Center Complex Proteins; D045362:Cytochromes c2