1LGL

Solution structure of HERG-specific scorpion toxin BeKm-1

SOLUTION NMR

---

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	DQF-COSY	1 mM BeKm-1, 90% H2O, 10% D2O	90% H2O/10% D2O	0	3.5	ambient	303
2	2D TOCSY	1 mM BeKm-1, 90% H2O, 10% D2O	90% H2O/10% D2O	0	3.5	ambient	303
3	2D NOESY	1 mM BeKm-1, 90% H2O, 10% D2O	90% H2O/10% D2O	0	3.5	ambient	303
4	DQF-COSY	1 mM BeKm-1	99.9% D2O	0	3.5	ambient	303
5	2D TOCSY	1 mM BeKm-1	99.9% D2O	0	3.5	ambient	303
6	2D NOESY	1 mM BeKm-1	99.9% D2O	0	3.5	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITY	600

NMR Refinement
Method	Details	Software
simulated annealing combined with torsion angle dynamics	The structures are based on a total of 653 restraints: 326/67 are NOE-derived upper/lower distance constraints, 68/46 backbone/sidechain dihedral angle restraints, 64/64 upper/lower distance restraints from 23 (18 bb-bb, 5 bb-sc) hydrogen bonds, 9/9 upper/lower distance restraints from 3 SS-bonds.	VNMR

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	200
Conformers Submitted Total Number	20
Representative Model	5 (lowest energy)

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

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	5.3b	VARIAN
2	processing	VNMR	5.3b	VARIAN
3	data analysis	XEASY	1.2.11	Bartels
4	structure solution	DYANA	1.5	Guentert
5	refinement	FANTOM	4	Schaumann