SOLUTION NMR
| NMR Experiment | ||||||||
|---|---|---|---|---|---|---|---|---|
| Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
| 1 | TROSY version of HNCA, HNCACB, HNCACO | 1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O | 95% H2O/5% D2O | 30 mM salt | 7.0 | ambient | 303 | |
| 2 | 2D 1H-15N Spin Echo Difference Experiments for 3-bond Jcc and Jnc measurement | 1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O | 95% H2O/5% D2O | 30 mM salt | 7.0 | ambient | 303 | |
| 3 | Standard HNCO-based 3D experiments for measuring one-bond J(NH), J(NC'), and J(C'Ca) | 1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O | 95% H2O/5% D2O | 30 mM salt | 7.0 | ambient | 303 | |
| 4 | Standard HNCO-based 3D experiments for measuring one-bond D(NH), D(NC'), and D(C'Ca) | 1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 15 mg/ml Pf1, 95% H2O, 5% D2O | 95% H2O/5% D2O | 30 mM salt | 7.0 | ambient | 303 | |
| 5 | Standard 2D experiments for measuring 15N T1 and T2 | 1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O | 95% H2O/5% D2O | 30 mM salt | 7.0 | ambient | 303 | |
| NMR Spectrometer Information | |||
|---|---|---|---|
| Spectrometer | Manufacturer | Model | Field Strength |
| 1 | Bruker | AVANCE | 500 |
| 2 | Bruker | DMX | 600 |
| NMR Refinement | ||
|---|---|---|
| Method | Details | Software |
| simulated annealing, RDC refinement and analysis | Structure determination consists of five steps. 1. Measure RDCs in Pf1 alignment medium. 2. Identify the coiled-coil motif by RDC-based molecular replacement analysis. 3) Define the subtle curvature and super-coiling of the constituent helices by RDC refinement 4) Assemble parallel and anti-parallel models of the coiled-coil dimer using knowledge-based inter-molecular distance restraints. 5) Derive the correct monomer-monomer orientation by comparing experimental RDCs with those predicted from the 3D charge distribution and shape of the alternative structural models. | XwinNMR |
| NMR Ensemble Information | |
|---|---|
| Conformer Selection Criteria | all calculated structures submitted |
| Conformers Calculated Total Number | 20 |
| Conformers Submitted Total Number | 20 |
| Representative Model | 20 (lowest energy) |
| Computation: NMR Software | ||||
|---|---|---|---|---|
| # | Classification | Version | Software Name | Author |
| 1 | collection | XwinNMR | 3.5 | Bruker |
| 2 | processing | NMRPipe | 2.2 | Delaglio |
| 3 | refinement | XPLOR-NIH | 2.9.9 | |
| 4 | structure solution | PALES | 1 | Zweckstetter |
