Solution structure of Jingzhaotoxin-III, a novel toxin inhibiting both Nav and Kv channels
SOLUTION NMR
| NMR Experiment | ||||||||
|---|---|---|---|---|---|---|---|---|
| Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
| 1 | DQF-COSY | 6mM Jingzhaotoxin-III, 20mM deuterium sodium acetate buffer, 0.002% NaN3, 0.01mM EDTA, 0.2mM Sodium 3-(trimethylsilyl) propionate-2,2,3,3-d4, pH 4.0, 90% H2O, 10% D2O | 90% H2O/10% D2O | 20mM | 4.0 | ambient | 303 | |
| 2 | 2D TOCSY | 6mM Jingzhaotoxin-III, 20mM deuterium sodium acetate buffer, 0.002% NaN3, 0.01mM EDTA, 0.2mM Sodium 3-(trimethylsilyl) propionate-2,2,3,3-d4, pH 4.0, 90% H2O, 10% D2O | 90% H2O/10% D2O | 20mM | 4.0 | ambient | 303 | |
| 3 | 2D NOESY | 6mM Jingzhaotoxin-III, 20mM deuterium sodium acetate buffer, 0.002% NaN3, 0.01mM EDTA, 0.2mM Sodium 3-(trimethylsilyl) propionate-2,2,3,3-d4, pH 4.0, 90% H2O, 10% D2O | 90% H2O/10% D2O | 20mM | 4.0 | ambient | 303 | |
| NMR Spectrometer Information | |||
|---|---|---|---|
| Spectrometer | Manufacturer | Model | Field Strength |
| 1 | Bruker | DRX | 500 |
| NMR Refinement | ||
|---|---|---|
| Method | Details | Software |
| distance geometry, simulated annealing | Structural calculations were performed on 395 interproton distance constraints derived from the 2D NOESY spectra, 13 dihedral angle constraints derived from the coupling constant (DQF-COSY) and NOE measurements, eight hydrogen-bond restraints derived from the hydrogen-deuterium exchange experiments, and nine disulfide bond restraints, giving a total of 425 restraints. | X-PLOR |
| NMR Ensemble Information | |
|---|---|
| Conformer Selection Criteria | structures with the lowest energy |
| Conformers Calculated Total Number | 100 |
| Conformers Submitted Total Number | 20 |
| Representative Model | 1 (lowest energy) |
| Additional NMR Experimental Information | |
|---|---|
| Details | TOCSY spectra were obtained with a mixing time of 85 ms. NOESY spectra were recorded in D2O with a mixing time of 200 ms and in H2O with mixing times of 100, 200, and 400 ms. All two-dimensional measurements were recorded with 1024-512 frequency data points and were zero-filled to yield 2048-1024 data matrices except for the high resolution DQF-COSY spectrum. The DQF-COSY spectrum was recorded with 2048-1024 data points in the t2 and t1 dimensions, respectively, and zero-filled to 4096 - 2048 points to measure the coupling constants. |
| Computation: NMR Software | ||||
|---|---|---|---|---|
| # | Classification | Version | Software Name | Author |
| 1 | refinement | X-PLOR | NIH 2.9.6 | Brunger A. T. etall |
| 2 | data analysis | Felix | 98.0 | Biosym Technologies |
