2JOT

Nuclear Magnetic Resonance Studies on Huwentoxin-XI from the Chinese Bird Spider Ornithoctonus huwena

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D DQF-COSY	5 mM [U-100% 15N] Huwentoxin-xi, 50mM K2HPO4-KH2PO4 buffer (adjust pH value to 4.0 using H3PO4), small amount of azide for stabilization, sodium 2, 2-dimethyl-2- silapentane-5-sulfonate (DSS)	95% H2O/5% D2O	50	4.0	ambient	303
2	2D 1H-1H NOESY	5 mM [U-100% 15N] Huwentoxin-xi, 50mM K2HPO4-KH2PO4 buffer (adjust pH value to 4.0 using H3PO4), small amount of azide for stabilization, sodium 2, 2-dimethyl-2- silapentane-5-sulfonate (DSS)	95% H2O/5% D2O	50	4.0	ambient	303
3	2D 1H-13C HSQC	5 mM [U-100% 15N] Huwentoxin-xi, 50mM K2HPO4-KH2PO4 buffer (adjust pH value to 4.0 using H3PO4), small amount of azide for stabilization, sodium 2, 2-dimethyl-2- silapentane-5-sulfonate (DSS)	95% H2O/5% D2O	50	4.0	ambient	303
4	2D 1H-15N HSQC	5 mM [U-100% 15N] Huwentoxin-xi, 50mM K2HPO4-KH2PO4 buffer (adjust pH value to 4.0 using H3PO4), small amount of azide for stabilization, sodium 2, 2-dimethyl-2- silapentane-5-sulfonate (DSS)	95% H2O/5% D2O	50	4.0	ambient	303
5	3D 1H-15N TOCSY	5 mM [U-100% 15N] Huwentoxin-xi, 50mM K2HPO4-KH2PO4 buffer (adjust pH value to 4.0 using H3PO4), small amount of azide for stabilization, sodium 2, 2-dimethyl-2- silapentane-5-sulfonate (DSS)	95% H2O/5% D2O	50	4.0	ambient	303
6	3D 1H-15N NOESY	5 mM [U-100% 15N] Huwentoxin-xi, 50mM K2HPO4-KH2PO4 buffer (adjust pH value to 4.0 using H3PO4), small amount of azide for stabilization, sodium 2, 2-dimethyl-2- silapentane-5-sulfonate (DSS)	95% H2O/5% D2O	50	4.0	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	800
2	Bruker	AVANCE	500
3	Bruker	AVANCE	600

NMR Refinement
Method	Details	Software
simulated annealing, distance geometry		CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CNS		Brunger, Adams, Clore, Gros, Nilges and Read
2	refinement	CNS		Brunger, Adams, Clore, Gros, Nilges and Read

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.