2ORU

Solution structure of xtz1-peptide, a beta-hairpin peptide with a structured extension

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D TOCSY	2 mM xtz1-peptide; 90% H2O, 10% D2O, pH 6, 0.010 ml of 0.1% DSS	90% H2O/10% D2O	2 mM peptide	6	AMBIENT	288
2	DQF-COSY	2 mM xtz1-peptide; 90% H2O, 10% D2O, pH 6, 0.010 ml of 0.1% DSS	90% H2O/10% D2O	2 mM peptide	6	AMBIENT	288
3	2D NOESY	2 mM xtz1-peptide; 90% H2O, 10% D2O, pH 6, 0.010 ml of 0.1% DSS	90% H2O/10% D2O	2 mM peptide	6	AMBIENT	288

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	600

NMR Refinement
Method	Details	Software
Simulated annealing and TORSION ANGLE DYNAMICS	Chemical shift assignments were manually done. Automated NOESY assignment and structure ensemble calculation was performed with CYANA v.2.1. A total of 431 unassigned NOESY peaks with intensity greater than ~1% of the most intense NOESY peak were input to CYANA. CYANA assigned 403 of 431 (93.5%) peaks, of which 309 were used as distance constraints in the structure calculation.	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (closest to the average)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1c
2	processing	NMRView	6.4	Johnson
3	structure solution	CYANA	2.1	Guentert
4	refinement	CYANA	2.1	Guentert