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NMR Structures Show Unwinding of the GCN4p Coiled Coil Superhelix Accompanying Disruption of Ion Pairs at Acidic pH
NMR Experiment Experiment Type Sample Contents Solvent Ionic Strength pH Pressure Temperature (K) Spectrometer 1 3D HNCACB 1.5 mM [U-99% 13C; U-99% 15N] GCN4p 90% H2O/10% D2O 20 mM 4.4 1 atm 298 Varian INOVA 600 2 2D 1H-15N HSQC 1.5 mM [U-99% 13C; U-99% 15N] GCN4p 90% H2O/10% D2O 20 mM 4.4 1 atm 298 Varian INOVA 600 3 3D 1H-15N NOESY 1.5 mM [U-99% 13C; U-99% 15N] GCN4p 90% H2O/10% D2O 20 mM 4.4 1 atm 298 Varian INOVA 600 4 3D 1H-13C NOESY 1.5 mM [U-99% 13C; U-99% 15N] GCN4p 90% H2O/10% D2O 20 mM 4.4 1 atm 298 Varian INOVA 600 5 3D HNCO 1.5 mM [U-99% 13C; U-99% 15N] GCN4p 90% H2O/10% D2O 20 mM 4.4 1 atm 298 Varian INOVA 600 6 2D 1H-15N HSQC 1.5 mM [U-99% 13C; U-99% 15N] GCN4p 100% D2O 20 mM 4.6 1 atm 283 Varian INOVA 600 7 2D 15N NOESY 1.5 mM [U-99% 13C; U-99% 15N] GCN4p 90% H2O/10% D2O 20 mM 4.4 1 atm 298 Varian INOVA 600 8 3D IF 1H-13CNOESY 1.5 mM 66% - 13C 33% - 12C GCN4p 100% D2O 20 mM 4.4 1 atm 298 Varian VNMRS 800
NMR Spectrometer Information Spectrometer Manufacturer Model Field Strength 1 Varian INOVA 600 2 Varian VNMRS 800
NMR Refinement Method Details Software DGSA-distance geometry simulated annealing X-PLOR NIH
NMR Ensemble Information Conformer Selection Criteria structures with the lowest energy Conformers Calculated Total Number 350 Conformers Submitted Total Number 20 Representative Model 1 (n/a)
Computation: NMR Software # Classification Version Software Name Author 1 processing Felix Accelrys Software Inc. 2 chemical shift assignment CcpNMR CCPN 3 structure calculation X-PLOR NIH Schwieters, Kuszewski, Tjandra and Clore 4 refinement ARIA Linge, O'Donoghue and Nilges