Experiment: 1IDH

THE NMR SOLUTION STRUCTURE OF THE COMPLEX FORMED BETWEEN ALPHA-BUNGAROTOXIN AND AN 18MER COGNATE PEPTIDE

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_TOCSY	2.1 mM alpha-Bungarotoxin/alpha18mer complex, alpha18mer is 15N labeled, 50 mM perdeuterated potassium acetate buffer (pH 4.0) with 5% D2O and 0.05% sodium azide	95% H2O/5% D2O		4.0	ambient	308
2	3D HNHA	2.1 mM alpha-Bungarotoxin/alpha18mer complex, alpha18mer is 15N labeled, 50 mM perdeuterated potassium acetate buffer (pH 4.0) with 5% D2O and 0.05% sodium azide	95% H2O/5% D2O		4.0	ambient	308
3	3D_15N-separated_NOESY	2.1 mM alpha-Bungarotoxin/alpha18mer complex, alpha18mer is 15N labeled, 50 mM perdeuterated potassium acetate buffer (pH 4.0) with 5% D2O and 0.05% sodium azide	95% H2O/5% D2O		4.0	ambient	308
4	2D_TOCSY	2.1 mM alpha-Bungarotoxin/alpha18mer complex, alpha18mer is 15N labeled, 50 mM perdeuterated potassium acetate buffer (pH 4.0) with 5% D2O and 0.05% sodium azide	95% H2O/5% D2O		4.0	ambient	308
5	2D_NOESY	2.1 mM alpha-Bungarotoxin/alpha18mer complex, alpha18mer is 15N labeled, 50 mM perdeuterated potassium acetate buffer (pH 4.0) with 5% D2O and 0.05% sodium azide	95% H2O/5% D2O		4.0	ambient	308
6	2D 1H-15N HSQC	2.1 mM alpha-Bungarotoxin/alpha18mer complex, alpha18mer is 15N labeled, 50 mM perdeuterated potassium acetate buffer (pH 4.0) with 5% D2O and 0.05% sodium azide	95% H2O/5% D2O		4.0	ambient	308

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

NMR Refinement
Method	Details	Software
distance geometry and simulated annealing		XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	The submitted conformer models are the 20 structures with the lowest energy from 120 acceptable structures which were from 300 total calculated structures and had no restraint violations. The best representative conformer is the lowest potential energy structure of the ensemble.
Conformers Calculated Total Number	300
Conformers Submitted Total Number	20
Representative Model	8 (it is the lowest potential energy structure of the ensemble)

Additional NMR Experimental Information
Details	The authors recommend using the Graphics program, MOLMOL, to view this ensemble of 20 structures.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.1	Bruker
2	processing	NMRPipe	1.8	Delaglio, F. et al.
3	data analysis	Sparky	3.95	Goddard, T.D. and Kneller, D.G.
4	refinement	CNSsolve	1.0	Brunger, A.T. et al.