6OTA

THREE-DIMENSIONAL STRUCTURE IN SOLUTION OF THE RIBBON DISULFIDE ISOMER OF THE NICOTINIC ACETYLCHOLINE RECEPTOR ANTAGONIST ALPHA-CONOTOXIN TxIA

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H TOCSY	2 mg/L ribbon TxIA	90% H2O/10% D2O	0 mM	4	ambient atm	280	Bruker AVANCE III 600
2	2D 1H-1H NOESY	2 mg/L ribbon TxIA	90% H2O/10% D2O	0 mM	4	ambient atm	280	Bruker AVANCE III 600
3	2D 1H-15N HSQC	2 mg/L ribbon TxIA	90% H2O/10% D2O	0 mM	4	ambient atm	280	Bruker AVANCE III 600
4	2D 1H-13C HSQC	2 mg/L ribbon TxIA	90% H2O/10% D2O	0 mM	4	ambient atm	280	Bruker AVANCE III 600

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

NMR Refinement
Method	Details	Software
simulated annealing		CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	CNS	1.2	Brunger, Adams, Clore, Gros, Nilges and Read
2	structure calculation	CYANA	3.97	Guntert, Mumenthaler and Wuthrich
3	data analysis	CcpNmr Analysis		CCPN
4	data analysis	TALOS		Cornilescu, Delaglio and Bax

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.