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SH3 DOMAIN FROM BRUTON'S TYROSINE KINASE, NMR, 42 STRUCTURES
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
NOESY
6.5
303
2
TOCSY
6.5
303
3
DQF-COSY
6.5
303
4
15N-TOCSY-HSQC
6.5
303
5
15N-NOESY-HSQC
6.5
303
6
HNHA
6.5
303
7
HNHB
6.5
303
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
UNITY 500
500
NMR Refinement
Method
Details
Software
AB INITIO-SIMULATED ANNEALING
THE STRUCTURE WAS DETERMINED USING 756 DISTANCE RESTRAINTS, 52 DIHEDRAL ANGLE RESTRAINTS AND 22 HYDROGEN BOND RESTRAINTS. THE HYDROGEN BOND RESTRAINTS WERE USED ONLY IN THE LAST STEP OF REFINEMENT. 50 STRUCTURES WERE CALCULATED AND REFINED USING AB INITIO SIMULATED ANNEALING PROTOCOL FOR X-PLOR (1). ALL FORCE CONSTANTS AND POTENTIALS WERE SET TO THE DEFAULT (PROTOCOL) VALUES EXCEPT FOR THE VAN DER WAALS' RADII SCALE FACTOR ("REPEL"), WHICH WAS DECREASED TO 0.80 INSTEAD OF 0.75 DURING THE FINAL COOLING STAGES IN THE REFINEMENT. THIS RESULTS IN MORE REASONABLE BACKBONE CONFORMATION AND SOMEWHAT HIGHER X-PLOR TOTAL ENERGIES. CENTER AVERAGING PSEUDOATOM CORRECTION WAS USED FOR ALL DISTANCE RESTRAINT S(2). ON THE BASIS OF X-PLOR TOTAL ENERGY 42 LOWEST ENERGY STRUCTURES WERE SELECTED.