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SOLUTION STRUCTURE OF ORYZACYSTATIN-I, A CYSTEINE PROTEINASE INHIBITOR OF THE RICE, ORYZA SATIVA L. JAPONICA
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
3 mM oryzacystatin-I; 50 mM sodium phosphate/100 mM NaCl/0.02% NaN3, pH 6.8; 10% D2O/90% H2O
10% D2O/90% H2O
6.8
ambient
298
2
3D_15N-separated_NOESY
2 mM oryzacystatin-I U-15N; 50 mM sodium phosphate/100 mM NaCl/0.02% NaN3, pH 6.8; 10% D2O/90% H2O
10% D2O/90% H2O
6.8
ambient
298
3
HNHA
2 mM oryzacystatin-I U-15N; 50 mM sodium phosphate/100 mM NaCl/0.02% NaN3, pH 6.8; 10% D2O/90% H2O
10% D2O/90% H2O
6.8
ambient
298
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
INOVA
500
NMR Refinement
Method
Details
Software
torsion angle dynamics
A total of 1383 restraints, consisting of 1183 interproton distance restraints (338 long-range (|i - j| >= 6), 228 medium-range (2 <= |i - j| <= 5), 351 sequential (|i - j| = 1) and 266 intraresidual (|i - j| = 0)), 108 hydrogen bond restraints (representing 54 hydrogen bonds) and 92 torsion angle restraints (54 phi and 38 chi1), were used in the structure calculations by torsion angle dynamics using DYANA (ver. 1.4). A final set of 20 structures was selected from 100 calculations on the basis of agreement with the experimental data and van der Waals' energy. The average coordinates of the 20 DYANA structures were subjected to energy-minimization using CNS (ver. 0.9).
VNMR
NMR Ensemble Information
Conformer Selection Criteria
structures with favorable non-bond energy
Conformers Calculated Total Number
100
Conformers Submitted Total Number
21
Representative Model
21 (minimized average structure)
Additional NMR Experimental Information
Details
The structure was determined using 1H and 15N NMR spectroscopy.