1I02

NMR STRUCTURE OF CTX A3 AT NEUTRAL PH (20 STRUCTURES)

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	5mM Cardiotoxin A3; 10mM phosphate buffer	90% H2O/10% D2O		6.0	1 atm	300
2	2D NOESY	5mM Cardiotoxin A3; 10mM phosphate buffer	90% H2O/10% D2O		6.0	1 atm	283
3	DQF-COSY	5mM Cardiotoxin A3; 10mM phosphate buffer	90% H2O/10% D2O		6.0	1 atm	300
4	DQF-COSY	5 mM Cardiotoxin A3; 10mM phosphate buffer	100% D2O		6.0	1 atm	300

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX	500

NMR Refinement
Method	Details	Software
distance geometry and simulated annealing	The NMR structures are based on a total of 680 NOE restraints, 40 dihedral angle restraints, 19 distance restraints from hydrogen bonds and 4 disulfide bond linkages.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	The submitted structures are the 20 structures with the lowest energy.
Conformers Calculated Total Number	50
Conformers Submitted Total Number	20
Representative Model	1 (closest to the average)

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

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.1
2	data analysis	XwinNMR	2.1
3	structure solution	X-PLOR	3.1	Brunger
4	refinement	X-PLOR	3.1	Brunger

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 R01GM133198.