1c7m
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SOLUTION STRUCTURE OF THE FUNCTIONAL DOMAIN OF PARACOCCUS DENITRIFICANS CYTOCHROME C552 IN THE REDUCED STATE
OverviewOverview
In order to determine the solution structure of Paracoccus denitrificans, cytochrome c552 by NMR, we cloned and isotopically labeled a 10.5-kDa, soluble fragment (100 residues) containing the functional domain of the, 18.2-kDa membrane-bound protein. Using uniformly 15N-enriched samples of, cytochrome c552 in the reduced state, a variety of two-dimensional and, three-dimensional heteronuclear double-resonance NMR experiments was, employed to achieve complete 1H and 15N assignments. A total of 1893, distance restraints was derived from homonuclear 2D-NOESY and, heteronuclear 3D-NOESY spectra; 1486 meaningful restraints were used in, the structure calculations. After restrained energy minimization a family, of 20 structures was obtained with rmsd values of 0.56 +/- 0. 10 A and, 1.09 +/- 0.09 A for the backbone and heavy atoms, respectively. The, overall topology is similar to that seen in previously reported models of, this class of proteins. The global fold consists of two long helices at, the N-terminus and C-terminus and three shorter helices surrounding the, heme moiety; the helices are connected by well-defined loops. Comparison, with the X-ray structure shows some minor differences in the positions of, the Trp57 and Phe65 side-chain rings as well as the heme propionate, groups.
About this StructureAbout this Structure
1C7M is a Single protein structure of sequence from Paracoccus denitrificans with HEC as ligand. Full crystallographic information is available from OCA.
ReferenceReference
Solution structure of the functional domain of Paracoccus denitrificans cytochrome c552 in the reduced state., Pristovsek P, Lucke C, Reincke B, Ludwig B, Ruterjans H, Eur J Biochem. 2000 Jul;267(13):4205-12. PMID:10866825 [[Category: isotope enrichment {15n}]]
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