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