1ORL

1H NMR structure determination of Viscotoxin C1

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D TOCSY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; 90%H20, 10% D2O	90%H20, 10% D2O	50mM phosphate buffer	3.6	ambient	285
2	2D NOESY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; 90%H20, 10% D2O	90%H20, 10% D2O	50mM phosphate buffer	3.6	ambient	285
3	DQF-COSY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; 90%H20, 10% D2O	90%H20, 10% D2O	50mM phosphate buffer	3.6	ambient	285
4	2D TOCSY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; 90%H20, 10% D2O	90%H20, 10% D2O	50mM phosphate buffer	3.6	ambient	295
5	2D NOESY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; 90%H20, 10% D2O	90%H20, 10% D2O	50mM phosphate buffer	3.6	ambient	295
6	DQF-COSY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; 90%H20, 10% D2O	90%H20, 10% D2O	50mM phosphate buffer	3.6	ambient	295
7	2D TOCSY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; D2O	D2O	50mM phosphate buffer	3.6	ambient	285
8	2D NOESY	0.7 mM viscotoxin B; phosphate buffer pH 3.6 50mM; D2O	D2O	50mM phosphate buffer	3.6	ambient	285

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

NMR Refinement
Method	Details	Software
DYANA was employed for structure determination Discover was employed for energy minimisation of DYANA structures	the structures are based on a total of 691 restraints. 631 are NOE-derived distance restraints,(224intraresidues,159 short range, 125 medium range and 123 long range), 18 dihedral angle restraints, 24 for backbone H-bonds and 18 for disulphide bridges. Bond lengths CD-OE2 in glutamic acid residues and CG-OD2 in aspartic acid residues are larger than typical values (as seen in remark 500) because protonated forms were considered due to the low experimental pH.	DYANA

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	600
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	This structure was determined using standard 1H 2D NMR techniques

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	DYANA	1.4	Guentert
2	structure solution	DISCOVER	1997 version	Molecular Simulations, san Diego, CA, USA
3	processing	XWINNMR	2.6	Bruker
4	data analysis	XEASY	1.3	Xia and Bartels
5	refinement	DISCOVER	1997 version	Molecular Simulations, san Diego, CA, USA