Crystallization and X-ray structure determination of cytochrome c2 from Rhodobacter sphaeroides in three crystal forms
| Autor: | Michael W. Day, Arthur J. Chirino, Herbert L. Axelrod, Barbara T. Hsu, Douglas C. Rees, George Feher, James P. Allen |
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| Rok vydání: | 1994 |
| Předmět: |
genetic structures
Cytochrome biology Chemistry General Medicine Triclinic crystal system biology.organism_classification law.invention Crystal Crystallography Tetragonal crystal system chemistry.chemical_compound Rhodobacter sphaeroides Structural Biology law biology.protein Photosynthetic bacteria Bacteriochlorophyll Crystallization |
| Zdroj: | Acta crystallographica. Section D, Biological crystallography. 50(Pt 4) |
| ISSN: | 0907-4449 |
| Popis: | Cytochrome c(2) serves as the secondary electron donor that reduces the photo-oxidized bacteriochlorophyll dimer in photosynthetic bacteria. Cytochrome c(2) from Rhodobacter sphaeroides has been crystallized in three different forms. At high ionic strength, crystals of a hexagonal space group (P6(1)22) were obtained, while at low ionic strength, triclinic (P1) and tetragonal (P4(1)2(1)2) crystals were formed. The three-dimensional structures of the cytochrome in all three crystal forms have been determined by X-ray diffraction at resolutions of 2.20 A (hexagonal), 1.95 A, (triclinic) and 1.53 A (tetragonal). The most significant difference observed was the binding of an imidazole molecule to the iron atom of the heme group in the hexagonal structure. This binding displaces the sulfur atom of Met l00, which forms the axial ligand in the triclinic and tetragonal structures. |
| Databáze: | OpenAIRE |
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