1ED7

SOLUTION STRUCTURE OF THE CHITIN-BINDING DOMAIN OF BACILLUS CIRCULANS WL-12 CHITINASE A1

SOLUTION NMR

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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.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	X-PLOR	3.851	Brunger
2	structure solution	DYANA	1.5	Guentert
3	processing	NMRPipe	1.7	Delaglio
4	collection	XwinNMR	2.0	Bruker
5	data analysis	nmrPipp	4.2.4	Garrett
6	data analysis	MOLMOL	2.3	Koradi