1KC4

NMR Structural Analysis of the Complex Formed Between alpha-Bungarotoxin and the Principal alpha-Neurotoxin Binding Sequence on the alpha7 Subunit of a Neuronal Nicotinic Acetylcholine Receptor

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP	95% H2O/5% D2O		5.5	ambient	308
2	2D TOCSY	1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP	95% H2O/5% D2O		5.5	ambient	308
3	3D_15N-separated_NOESY	1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP	95% H2O/5% D2O		5.5	ambient	308
4	3D_15N-separated_TOCSY	1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP	95% H2O/5% D2O		5.5	ambient	308
5	2D 1H-15N HSQC	1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP	95% H2O/5% D2O		5.5	ambient	308
6	HNHA	1.6 mM alpha-bungarotoxin/[U-15N]-alpha 7 19mer complex 30 mM sodium phosphate, pH 5.5 50 micromolar sodium azide 50 micromolar TMSP	95% H2O/5% D2O		5.5	ambient	308

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600
2	Bruker	AVANCE	400

NMR Refinement
Method	Details	Software
distance geometry dynamical simulated annealing	RMS DEVIATIONS FROM IDEAL VALUES: BOND LENGTH(A) 0.0039, ANGLES(DEG) 0.61, IMPROPERS(DEG) 0.53	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	The submitted conformer models are the 10 with the lowest energy from a pool of over 100 accepted structures that had no restraint violations.
Conformers Calculated Total Number
Conformers Submitted Total Number	10
Representative Model	1 (determined by nmrclust 1.2)

Additional NMR Experimental Information
Details	THE WELL-DEFINED REGIONS IN THE COMPLEX, EXHIBITING EXTENSIVE LONG RANGE NOES, ARE: BGTX: 1-16, 22-28, 39-48, AND 54-68 ALPHA 7 19MER: 185-194

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.1
2	processing	NMRPipe	1.8	Delaglio, F., et al.
3	data analysis	Sparky	3.87	Goddard, T.D. and Kneller, D.G.
4	refinement	CNS	1.0	Brunger, A.T., et al.

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.