1KFH

Solution Structure of alpha-Bungarotoxin by NMR Spectroscopy

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	NOESY	4mM alpha-Bungarotoxin pH 5.79 at 288, 298, and 308 degrees K	95% H2O/5% D2O	no buffers, pH adjusted w/HCl and NaOH	5.79	ambient	298
2	DQF-COSY	4mM alpha-Bungarotoxin pH 5.79 at 288, 298, and 308 degrees K	95% H2O/5% D2O	no buffers, pH adjusted w/HCl and NaOH	5.79	ambient	298
3	E-COSY	4mM alpha-Bungarotoxin pH 5.79	99.9% D2O	no buffers, pH adjusted w/DCl and NaOD	5.79	ambient	308

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	GE	GN	500

NMR Refinement
Method	Details	Software
distance geometry, molecular dynamics, matrix relaxation	total number of restraints used: 657, Total number of NOE restraints: 588, Total number of dihedral angle restraints: 60, Used 9 hydrogen-bond restraints	MARDIGRAS

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	20
Conformers Submitted Total Number	13
Representative Model	4 (fewest violations)

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

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	iterative matrix relaxation	MARDIGRAS	2.0	Borgias, B. A., and James, T. L.
2	structure solution	VEMBED	1.0	Kuntz, I. D., Thomason, J. F., and Oshiro, C. M.
3	refinement	GROMOS	87 4D version	van Schaik, R. C., and van Gunsteren, W. F.

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.