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SOLUTION STRUCTURE OF THE CHITIN-BINDING DOMAIN OF BACILLUS CIRCULANS WL-12 CHITINASE A1
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
1.2 mM 15N-labeled ChBD-ChiA1 in 100 mM KH2PO4-K2HPO4 (pH 6.0) and 10 mM deuterated DTT
99.8% D2O
100
6.0
ambient
310
2
3D_15N-separated_NOESY
2.0 mM 15N-labeled ChBD-ChiA1 in 10 mM KH2PO4-K2HPO4 (pH 6.0) and 10 mM deuterated dithiothreitol (DTT)
90% H2O/10% D2O
10
6.0
ambient
310
3
HMQC-J
2.0 mM 15N-labeled ChBD-ChiA1 in 10 mM KH2PO4-K2HPO4 (pH 6.0) and 10 mM deuterated dithiothreitol (DTT)
90% H2O/10% D2O
10
6.0
ambient
310
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DRX
500
2
Bruker
DRX
800
NMR Refinement
Method
Details
Software
simulated annealing
The structures are based on 493 NOE-based distance, 20 hydrogen bond, and 33 dihedral angle constraints.
X-PLOR
NMR Ensemble Information
Conformer Selection Criteria
structures with the lowest energy
Conformers Calculated Total Number
100
Conformers Submitted Total Number
30
Representative Model
26 (closest to the average)
Additional NMR Experimental Information
Details
This structure was determined using a uniformly 15N-labeled ChBD-ChiA1. Stereospecific assignments of the methyl groups of the leucine and valine residues were achieved with 15% fractionally 13C-labeled ChBD-ChiA1 dissolved in 99.8% D2O.