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SOLUTION STRUCTURE OF THE MAIN ALPHA-AMYLASE INHIBITOR FROM AMARANTH SEEDS
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
DQF-COSY
1.8 mM AAI, 0.05 mM NaN3
90% H2O/10% D2O
2.95
ambient
277
2
DQF-COSY
1.8 mM AAI, 0.05 mM NaN3
100% D2O
2.95
ambient
277
3
TOCSY
1.8 mM AAI, 0.05 mM NaN3
90% H2O/10% D2O
2.95
ambient
277
4
TOCSY
1.8 mM AAI, 0.05 mM NaN3
90% H2O/10% D2O
2.95
ambient
277
5
2D NOESY
1.8 mM AAI, 0.05 mM NaN3
90% H2O/10% D2O
2.95
ambient
277
6
2D NOESY
1.8 mM AAI, 0.05 mM NaN3
100% D2O
2.95
ambient
277
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
AVANCE
600
2
Bruker
AMX
500
3
Varian
UNITY
600
NMR Refinement
Method
Details
Software
simulated annealing
restrained MD at 1000K follwed by stepwise cooling to 300K and final restrained energy optimisation
XwinNMR
NMR Ensemble Information
Conformer Selection Criteria
structures with favorable non-bond energy,structures with the least restraint violations
Conformers Calculated Total Number
100
Conformers Submitted Total Number
20
Representative Model
1 (n/a)
Additional NMR Experimental Information
Details
This structure was determined from 2D 1H NMR techniques only using the sequence specific resonance assignment procedure, followed by NOE and J data collection, calculation bij X-plor and refinement with MSI's CVFF forcefield