1I25

Three dimensional solution structure of huwentoxin-II by 2D 1H-NMR

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	NOESY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 90%H2O , 10%D2O	90% H2O/10% D2O	20	5.4	1 atm	300
2	DQF-COSY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 90%H2O , 10%D2O	90% H2O/10% D2O	20	5.4	1 atm	300
3	TOCSY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 90%H2O , 10%D2O	90% H2O/10% D2O	20	5.4	1 atm	300
4	NOESY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 100%D2O	100% D2O	20	5.4	1 atm	300
5	E-COSY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 100%D2O	100% D2O	20	5.4	1 atm	300
6	TOCSY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 100%D2O	100% D2O	20	5.4	1 atm	300
7	NOESY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 90%H2O , 10%D2O	90% H2O/10% D2O		5.4	1 atm	290
8	TOCSY	4 mM Huwentoxin-II; 20 mmol/l phosphate buffer; 90%H2O , 10%D2O	90% H2O/10% D2O		5.4	1 atm	290

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

NMR Refinement
Method	Details	Software
simulated annealing	The structures are based on 592 NOE-derived distance constraints, 16 dihedral angel restraints and 9 fake distance restraints from disulfide bonds.	FELIX

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	10
Representative Model	1 (closest to the average)

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	FELIX	98.0	Molecular Simulations, Inc.
2	refinement	X-PLOR	3.851	Brunger