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Turn stability in beta-hairpin peptides: 3:5 type I G1 bulge turns
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D ROESY
8 mM peptide, no buffer
90% H2O/10% D2O
0
5.0
1 atm
303
2
2D TOCSY
8 mM peptide, no buffer
90% H2O/10% D2O
0
5.0
1 atm
303
3
DQF-COSY
8 mM peptide, no buffer
90% H2O/10% D2O
0
5.0
1 atm
303
4
2D ROESY
8 mM peptide, no buffer
100% D2O
0
5.0
1 atm
303
5
2D COSY-35
8 mM peptide, no buffer
100% D2O
0
5.0
1 atm
303
6
2D 13C-HMQC
8 mM peptide, no buffer
100% D2O
0
5.0
1 atm
303
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DRX
500
NMR Refinement
Method
Details
Software
distance geometry and restrained molecular dynamics
100 distance geometry structures were calculated. The 80 structures of lowest penalty function were further refined using restrained molecular dynamics.
The 20 structures of lowest restraint violation energy were used to describe the structure.
61 distance and 21 dihedral angle restraints were used.
The final ensemble has no distance violations greater than 0.1 A and no dihedral angle vioaltions greater than 1 degree.
95% of the residues are in the most favourable region of the Ramachandran plot.
The mean backbone atom rmsd to the mean structure is 0.29+/-0.05 A.
DGII
NMR Ensemble Information
Conformer Selection Criteria
structures with the least restraint violations
Conformers Calculated Total Number
80
Conformers Submitted Total Number
21
Representative Model
3 (closest to the average)
Additional NMR Experimental Information
Details
This structure was determined using standard 2D homonuclear techniques augmented by loose phi and psi restraints generated from TALOS. MODEL 21 is the average minimized structure.