1JRJ

Solution structure of exendin-4 in 30-vol% trifluoroethanol

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	Natural abundance	2mg/ml in pH 5.9 15mM phosphate buffer with 30 vol-% trifluoroethanol added	15mM potassium phosphate	5.9	ambient	280
2	2D TOCSY	Natural abundance	2mg/ml in pH 5.9 15mM phosphate buffer with 30 vol-% trifluoroethanol added	15mM potassium phosphate	5.9	ambient	280

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	750

NMR Refinement
Method	Details	Software
simulated annealing	The structures were calculated using CNS 0.9 with 294 NOE distance constraints, 20 distance constraints from defined torsion angles, and 116 anti-distance constraints. No hydrogen bond constraints were employed.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with acceptable covalent geometry, structures with favorable non-bond energy, structures with the least restraint violations
Conformers Calculated Total Number	50
Conformers Submitted Total Number	36

Additional NMR Experimental Information
Details	2D NOESYs performed with mixing times of 60, 150 (deuterated medium), 160ms.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR		Bruker
2	processing	Felix	95	MSI
3	structure solution	CNS	0.9	Brunger
4	refinement	CNS	0.9	Brunger