1JLP

Solution Structure of the Noncompetitive Skeletal Muscle Nicotinic Acetylcholine Receptor Antagonist Psi-conotoxin PIIIF

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	12 mM psi-conotoxin PIIIF; TFA added to pH 3.5	90% H2O/10% D2O	12 mM; tetra-TFA salt	3.5	ambient	277
2	DQF-COSY	12 mM psi-conotoxin PIIIF; TFA added to pH 3.5	90% H2O/10% D2O	12 mM; tetra-TFA salt	3.5	ambient	277
3	PE-COSY	12 mM psi-conotoxin PIIIF	100% D2O	12 mM; tetra-TFA salt	3.5	ambient	295
4	13C-selected 2D NOESY	14 mM of psi-conotoxin PIIIF [5,10,16,21,22] 3-13C-Cys; TFA added to pH 3.5	90% H2O/10% D2O	12 mM; tetra-TFA salt	3.5	ambient	277
5	13C-selected 2D NOESY	16 mM of psi-conotoxin PIIIF [4] 3-13C-Cys; TFA added to pH 3.5	90% H2O/10% D2O	12 mM; tetra-TFA salt	3.5	ambient	277
6	Double half-filtered 2D NOESY	16 mM of psi-conotoxin PIIIF [4] 3-13C-Cys; TFA added to pH 3.5	90% H2O/10% D2O	12 mM; tetra-TFA salt	3.5	ambient	277
7	Double half-filtered 2D PE-COSY	16 mM of psi-conotoxin PIIIF [4] 3-13C-Cys; TFA added to pH 3.5	90% H2O/10% D2O	12 mM; tetra-TFA salt	3.5	ambient	295
8	13C-selected 1D 1H NMR	16 mM of psi-conotoxin PIIIF [4] 3-13C-Cys; TFA added to pH 3.5	90% H2O/10% D2O	12 mM; tetra-TFA salt	3.5	ambient	295

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITY	500
2	Varian	INOVA	600

NMR Refinement
Method	Details	Software
distance geometry molecular dynamics relaxation matrix distance geometry simulated annealing	These structures are based on 380 NOE-derived distance restraints, 7 restraints on phi derived from J-coupling, and 7 restraints on chi1 determined from J-coupling and NOE volumes.	VNMR

NMR Ensemble Information
Conformer Selection Criteria	back calculated data agree with experimental NOESY spectrum, structures with the least restraint violations, structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	17
Representative Model	12 (closest to the average)

Additional NMR Experimental Information
Details	This structure was determined using isotopic filtration and isotope-selected 1H observation in addition to standard homonuclear techniques.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1B	Varian, Inc.
2	processing	Felix	97.0	MSI, Inc.
3	iterative matrix relaxation	IRMA	97.0	MSI, Inc.
4	structure solution	DGII	97.0	MSI, Inc.
5	structure solution	Discover	2.98	MSI, Inc.
6	refinement	Discover	2.98	MSI, Inc.

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 R01GM157729.