Experiment: 2B5B

A reptilian defensin with anti-bacterial and anti-viral activity

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D TOCSY	5mM egg-white protein, 0.1M NaCl, pH=4.5, 90% H2O, 10% D2O	90% H2O/10% D2O	0.1M NaCl	4.5	ambient	300
2	2D NOESY	5mM egg-white protein, 0.1M NaCl, pH=4.5, 90% H2O, 10% D2O	90% H2O/10% D2O	0.1M NaCl	4.5	ambient	300
3	DQF-COSY	5mM egg-white protein, 0.1M NaCl, pH=4.5, 90% H2O, 10% D2O	90% H2O/10% D2O	0.1M NaCl	4.5	ambient	300
4	TQF-COSY	5mM egg-white protein, 0.1M NaCl, pH=4.5, 90% H2O, 10% D2O	90% H2O/10% D2O	0.1M NaCl	4.5	ambient	300

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

NMR Refinement
Method	Details	Software
simulated annealing, torsion angle dynamics, energy minimization and molecular dynamics at constant temperature, time and volume	The structures are based on a total of 109 NOE-derived distance restraints, 25 angle restraints, 3 disulphide restraints and 4 restraints from hydrogen bonds	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	1000
Conformers Submitted Total Number	10
Representative Model	1 (minimized average structure)

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

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	XwinNMR	1.2	Bruker
2	structure solution	DYANA	1.5	Peter Guentert & Kurt Wuthrich, Zurich, Switzerland
3	refinement	Discover	3.0