NMR Structural Analysis of the Complex Formed Between alpha-Bungarotoxin and the Principal alpha-Neurotoxin Binding Sequence on the alpha7 Subunit of a Neuronal Nicotinic Acetylcholine Receptor
SOLUTION NMR
| NMR Experiment | ||||||||
|---|---|---|---|---|---|---|---|---|
| Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
| 1 | 2D NOESY | 1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP | 95% H2O/5% D2O | 5.5 | ambient | 308 | ||
| 2 | 2D TOCSY | 1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP | 95% H2O/5% D2O | 5.5 | ambient | 308 | ||
| 3 | 3D_15N-separated_NOESY | 1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP | 95% H2O/5% D2O | 5.5 | ambient | 308 | ||
| 4 | 3D_15N-separated_TOCSY | 1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP | 95% H2O/5% D2O | 5.5 | ambient | 308 | ||
| 5 | 2D 1H-15N HSQC | 1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP | 95% H2O/5% D2O | 5.5 | ambient | 308 | ||
| 6 | HNHA | 1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP | 95% H2O/5% D2O | 5.5 | ambient | 308 | ||
| NMR Spectrometer Information | |||
|---|---|---|---|
| Spectrometer | Manufacturer | Model | Field Strength |
| 1 | Bruker | AVANCE | 600 |
| 2 | Bruker | AVANCE | 400 |
| NMR Refinement | ||
|---|---|---|
| Method | Details | Software |
| distance geometry dynamical simulated annealing | RMS DEVIATIONS FROM IDEAL VALUES: BOND LENGTH(A) 0.0039, ANGLES(DEG) 0.61, IMPROPERS(DEG) 0.53 | XwinNMR |
| NMR Ensemble Information | |
|---|---|
| Conformer Selection Criteria | The submitted conformer models are the 10 with the lowest energy from a pool of over 100 accepted structures that had no restraint violations. |
| Conformers Calculated Total Number | |
| Conformers Submitted Total Number | 10 |
| Representative Model | 1 (determined by nmrclust 1.2) |
| Additional NMR Experimental Information | |
|---|---|
| Details | THE WELL-DEFINED REGIONS IN THE COMPLEX, EXHIBITING EXTENSIVE LONG RANGE NOES, ARE: BGTX: 1-16, 22-28, 39-48, AND 54-68 ALPHA 7 19MER: 185-194 |
| Computation: NMR Software | ||||
|---|---|---|---|---|
| # | Classification | Version | Software Name | Author |
| 1 | collection | XwinNMR | 2.1 | |
| 2 | processing | NMRPipe | 1.8 | Delaglio, F., et al. |
| 3 | data analysis | Sparky | 3.87 | Goddard, T.D. and Kneller, D.G. |
| 4 | refinement | CNS | 1.0 | Brunger, A.T., et al. |
