1JBL

Solution structure of SFTI-1, A cyclic trypsin inhibitor from sunflower seeds

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1mM SFTI-1	20mM sodium phosphate,pH 4.5, 20% trifluoroethanol, 10% D2O	20mM	4.5	ambient	273
2	DQF-COSY	1mM SFTI-1	20mM sodium phosphate,pH 4.5, 20% trifluoroethanol, 10% D2O	20mM	4.5	ambient	273
3	E-COSY	1mM SFTI-1	20mM sodium phosphate,pH 4.5, 20% trifluoroethanol, 100% D2O	20mM	4.5	ambient	273

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	ARX	500
2	Bruker	DMX	750

NMR Refinement
Method	Details	Software
simulated annealing with refinement using a modified CSDX force field.	111 distance constraints, comprising 53 sequential, 18 medium range, 68 long range, 6 chi1 angle constraints 7 phi angle constraints	XWINNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	20

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	2.6	Bruker
2	processing	XWINNMR	2.6	Bruker
3	data analysis	ccnmr		Cieslar et al.
4	structure solution	X-PLOR	3.851	Brunger
5	refinement	X-PLOR	3.851	Brunger