1RJI

Solution Structure of BmKX, a novel potassium channel blocker from the Chinese Scorpion Buthus martensi Karsch

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	DQF-COSY	Phosphate buffer pH 5.0; 3mM BmKX	90% H2O/10% D2O	50mM phosphate	5.0	1 atm	300
2	2D TOCSY	Phosphate buffer pH 5.0; 3mM BmKX	90% H2O/10% D2O	50mM phosphate	5.0	1 atm	300
3	2D NOESY	Phosphate buffer pH 5.0; 3mM BmKX	90% H2O/10% D2O	50mM phosphate	5.0	1 atm	300
4	2D TOCSY	Phosphate buffer pH 5.0; 3mM BmKX	99.96% D2O	50mM phosphate	5.0	1 atm	300
5	E-COSY	Phosphate buffer pH 5.0; 3mM BmKX	99.96% D2O	50mM phosphate	5.0	1 atm	300
6	2D NOESY	Phosphate buffer pH 5.0; 3mM BmKX	99.96% D2O	50mM phosphate	5.0	1 atm	300

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	500

NMR Refinement
Method	Details	Software
simulated annealing and energy minimization	the structures are based on a total of 283 restraints, 245 are NOE-derived distance constraints, 19 dihedral angle restraints,19 distance restraints from hydrogen bonds.	XEASY

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	21
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	This structure was determined using standard 2D homonuclear techniques

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	data analysis	XEASY	3.2	K. Wuthrich
2	data analysis	DIANA	2.8	K. Wuthrich
3	structure solution	CNS	1.0	Brunger, A.T.
4	refinement	CNS	1.0	Brunger, A.T.