Determination of the NMR Solution Structure of the Cyclophilin A-Cyclosporin a Complex.Spitzfaden, C., Braun, W., Wider, G., Widmer, H., Wuthrich, K.
(1994) J.Biomol.NMR 4: 463
- PubMed: 8075536
- PubMed Abstract:
- Receptor-Induced Conformation Change of the Immunosuppressant Cyclosporin A.
Wuthrich, K.,Von Freyberg, B.,Weber, C.,Wider, G.,Traber, R.,Widmer, H.,Braun, W.
(1991) Science 254: 953
- The NMR Structure of Cyclosporin a Bound to Cyclophilin in Aqueous Solution.
Weber, C.,Wider, G.,Von Freyberg, B.,Traber, R.,Braun, W.,Widmer, H.,Wuthrich, K.
(1991) Biochemistry 30: 6563
The three-dimensional NMR solution structure of the cyclophilin A (Cyp)-cyclosporin A (CsA) complex was determined, and here we provide a detailed description of the analysis of the NMR data and the structure calculation. Using 15N- and 13C-resolved ...
The three-dimensional NMR solution structure of the cyclophilin A (Cyp)-cyclosporin A (CsA) complex was determined, and here we provide a detailed description of the analysis of the NMR data and the structure calculation. Using 15N- and 13C-resolved three- and four-dimensional [1H,1H]-nuclear Overhauser enhancement (NOE) spectroscopy with uniformly isotope-labeled Cyp in the complex, a final data set of 1810 intra-Cyp, 107 intra-CsA and 63 intermolecular NOE upper distance constraints was collected as input for the structure calculation with the program DIANA. A group of DIANA conformers, selected by a previously described analysis of the dependence of the maximal root-mean-square deviation (rmsd) among the individual conformers on the residual target function value, was subjected to energy refinement with the program FANTOM. The 22 best energy-refined conformers were then used to represent the solution structure. The average rmsd relative to the mean structure of these 22 conformers is 1.1 A for the backbone atoms of all residues of the complex. The molecular architecture of Cyp in the Cyp-CsA complex includes an eight-stranded antiparallel beta-barrel, which is closed on each side by an amphipathic helix. CsA is bound in a cavity formed by part of the barrel surface and four loops with nonregular secondary structure. Comparison of this structure with structures of Cyp-CsA and other Cyp-peptide complexes determined by different approaches shows extensive similarities.
Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule-Hönggerberg, Zürich, Switzerland.