1LMV
Solution structure of the unmodified U2 snRNA-intron branch site helix from S. cerevisiae
SOLUTION NMR
NMR Experiment | ||||||||
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Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
1 | 2D NOESY | 1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA | 90% H2O/10% D2O | 50mM sodium chloride | 6.4 | ambient | 278 | |
2 | 2D NOESY | 1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA | 100% D2O | 50mM sodium chloride | 6.4 | ambient | 293 | |
3 | 2D TOCSY | 1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA | 100% D2O | 50mM sodium chloride | 6.4 | ambient | 293 | |
4 | DQF-COSY | 1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA | 100% D2O | 50mM sodium chloride | 6.4 | ambient | 293 |
NMR Spectrometer Information | |||
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Spectrometer | Manufacturer | Model | Field Strength |
1 | Varian | UNITYPLUS | 720 |
NMR Refinement | ||
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Method | Details | Software |
torsion angle molecular dynamics, followed by congugate gradient minimization | VNMR |
NMR Ensemble Information | |
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Conformer Selection Criteria | structures with the lowest energy |
Conformers Calculated Total Number | 300 |
Conformers Submitted Total Number | 10 |
Representative Model | 2 (lowest energy) |
Additional NMR Experimental Information | |
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Details | This structure was determined using standard 2D homonuclear techniques. NOESY spectra were collected at many different mixing times to assess the buildup rate of each NOE, thereby resolving some of the spectral overlap. |
Computation: NMR Software | ||||
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# | Classification | Version | Software Name | Author |
1 | collection | VNMR | 5.3 | Varian, Inc. |
2 | data analysis | Sparky | 3.69 | T.D. Goddard and D.G. Kneller |
3 | structure solution | X-PLOR | 3.851 | Brunger |
4 | refinement | X-PLOR | 3.851 | Brunger |