1IJC

Solution Structure of Bucandin, a Neurotoxin from the Venom of the Malayan Krait

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1.7 mM bucandin	90% H2O/10% D2O	no salt added	3.0	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600

NMR Refinement
Method	Details	Software
distance geometry, simulated annealing, molecular dynamics, torsion angle dynamics	The structures are based on a total of 1363 restraints, 1258 are NOE-derived distance constraints, 61 dihedral angle restraints, 44 distance restraints from hydrogen bonds.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	6000
Conformers Submitted Total Number	20
Representative Model	10 (closest to the average)

Additional NMR Experimental Information
Details	The structures were determined using standard 2D homonuclear techniques.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	XwinNMR	2.6	Bruker
2	data analysis	XEASY	1.3.13	Bartels, C., Xia T., Billeter, M., Guntert, P., Wuthrich, K.
3	data analysis	INFIT		Szyperski, I., Guntert, P., Otting, G., Wuthrich, K.
4	structure solution	NOAH		Mumenthaler, C., Guntert, P., Braun, W., Wuthrich, K.
5	structure solution	DYANA	1.5	Guntert, P., Mumenthaler, C., Wuthrich, K.
6	structure solution	X-PLOR	3.843	Brunger, A.T.
7	refinement	X-PLOR	3.843	Brunger, A.T.

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.