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Two homologous rat cellular retinol-binding proteins differ in local structure and flexibility
NMR Experiment Experiment Type Sample Contents Solvent Ionic Strength pH Pressure Temperature (K) Spectrometer 1 3D_13C-separated_NOESY 1.0mM ligand free cellular retinol-binding
protein I U-[99% 15N, 99% 13C];
20mM phosphate buffer, 50mM potassium chloride,
0.05% sudium azide, 5mM beta-mecaptoethanol-d6;
99.5% D2O 99.5% D2O 0.34 7.4 ambient 298 2 3D_15N-separated_NOESY 1.0mM ligand free cellular retinol-binding
protein I U-[99% 15N];
20mM phosphate buffer, 50mM potassium chloride,
0.05% sudium azide, 5mM beta-mecaptoethanol-d6;
95% H2O, 5% D2O 95% H2O/5% D2O 0.34 7.4 ambient 298
NMR Spectrometer Information Spectrometer Manufacturer Model Field Strength 1 Varian INOVA 500 2 Varian INOVA 600 3 Varian UNITYPLUS 500 4 Varian UNITY 600
NMR Refinement Method Details Software distance geometry
simulated annealing VNMR
NMR Ensemble Information Conformer Selection Criteria target function Conformers Calculated Total Number 25 Conformers Submitted Total Number 22 Representative Model 1 (closest to the average)
Additional NMR Experimental Information Details Triple resonance experiments for
the 1H, 15N and 13C resonance
assignments included the following:
HNCO
CBCACONNH
HNCACB
CBCACOCAHA
HCCH-TOCSY
15N-resolved TOCSY-HSQC
Computation: NMR Software # Classification Version Software Name Author 1 collection VNMR 6.1 varian associates 2 processing VNMR 6.1 varian associates 3 data analysis Felix 2000 molecular simulation inc. 4 structure solution Tinker 3.3 Ponder, J.W. 5 refinement Tinker 3.3 Ponder, J.W.