9BFL

Solution structure of the scorpion toxin omega-Buthitoxin-Hf1a

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H TOCSY	2 mg/mL Buthitoxin-Hf1a	90% H2O/10% D2O	0 mM	3.5	ambient	298	Bruker AVANCE III HD 700
2	2D 1H-1H NOESY	2 mg/mL Buthitoxin-Hf1a	90% H2O/10% D2O	0 mM	3.5	ambient	298	Bruker AVANCE III HD 700
3	2D 1H-13C HSQC	2 mg/mL Buthitoxin-Hf1a	90% H2O/10% D2O	0 mM	3.5	ambient	298	Bruker AVANCE III HD 700
4	2D 1H-15N HSQC	2 mg/mL Buthitoxin-Hf1a	90% H2O/10% D2O	0 mM	3.5	ambient	298	Bruker AVANCE III HD 700

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE III HD	700

NMR Refinement
Method	Details	Software
simulated annealing	Structures were refined in explicit solvent using Cartesian dynamics within CNS.	CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with acceptable covalent geometry
Conformers Calculated Total Number	50
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	TopSpin		Bruker Biospin
2	processing	TopSpin		Bruker Biospin
3	chemical shift assignment	CARA		Keller and Wuthrich
4	structure calculation	CYANA		Guntert, Mumenthaler and Wuthrich
5	refinement	CNS	1.21	Brunger, Adams, Clore, Gros, Nilges and Read