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The Solution Structure of the CBM4-2 Carbohydrate Binding Module from a Thermostable Rhodothermus marinus Xylanase.
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
3D_13C-separated_NOESY
1.5 mM CBM4-2 15N-labelled, and 13C,15N double labelled protein;
50 mM CaCl2,
50 mM sodium acetate-d3,
pH 6.0,
10% D2O,
10 mM sodium azide,
0.1 mM sodium trimethylsilylpropionate (TSP)
90% H2O/10% D2O
0.2 M
6.0
ambient
310
2
3D_15N-separated_NOESY
1.5 mM CBM4-2 15N-labelled, and 13C,15N double labelled protein;
50 mM CaCl2,
50 mM sodium acetate-d3,
pH 6.0,
10% D2O,
10 mM sodium azide,
0.1 mM sodium trimethylsilylpropionate (TSP)
90% H2O/10% D2O
0.2 M
6.0
ambient
310
3
HNHA
1.5 mM CBM4-2 15N-labelled, and 13C,15N double labelled protein;
50 mM CaCl2,
50 mM sodium acetate-d3,
pH 6.0,
10% D2O,
10 mM sodium azide,
0.1 mM sodium trimethylsilylpropionate (TSP)
90% H2O/10% D2O
0.2 M
6.0
ambient
310
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DRX
500
2
Bruker
DRX
600
NMR Refinement
Method
Details
Software
hybrid distance geometry/simulated annealing using XPLOR
The final set of restraints contained 1654 non-redundant unambiguous NOEs and 17 ambiguous NOEs, 93 dihedral angle restraints, 72 chi1 and 1 chi2 restraint, and 65 pairs of hydrogen bond restraints, plus 177 backbone dihedral restraints based on 13C shifts from TALOS.
Felix
NMR Ensemble Information
Conformer Selection Criteria
structures with acceptable covalent geometry,structures with the least restraint violations,structures with the lowest energy