1AWX

SH3 DOMAIN FROM BRUTON'S TYROSINE KINASE, NMR, MINIMIZED AVERAGE STRUCTURE

SOLUTION NMR

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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. THE AVERAGE AND MINIMIZED STRUCTURE WAS CALCULATED BY AVERAGING SUPERIMPOSED STRUCTURES IN THE ENSEMBLE AND THEN ENERGY MINIMIZING THE AVERAGE STRUCTURE. THE POTENTIALS AND CONSTANTS USED IN THE ENERGY MINIMIZATION WERE THE SAME FOR THE AVERAGE STRUCTURE AND THE ENSEMBLE STRUCTURES.	X-PLOR

NMR Ensemble Information
Conformer Selection Criteria	MINIMIZED AVERAGE STRUCTURE BASED ON 42 LOWEST ENERGY STRUCTURES
Conformers Calculated Total Number	50
Conformers Submitted Total Number	1

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	X-PLOR	3.851	BRUNGER
2	structure solution	VNMR 4.3 AND	5.2
3	structure solution	ANSIG V.3.2	V.3.2
4	structure solution	X-PLOR V.3.851	V.3.851