1K42

The Solution Structure of the CBM4-2 Carbohydrate Binding Module from a Thermostable Rhodothermus marinus Xylanase.

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_13C-separated_NOESY	1.5 mM CBM4-2 15N-labelled, and 13C,15N double labelled protein; 50 mM CaCl2, 50 mM sodium acetate-d3, pH 6.0, 10% D2O, 10 mM sodium azide, 0.1 mM sodium trimethylsilylpropionate (TSP)	90% H2O/10% D2O	0.2 M	6.0	ambient	310
2	3D_15N-separated_NOESY	1.5 mM CBM4-2 15N-labelled, and 13C,15N double labelled protein; 50 mM CaCl2, 50 mM sodium acetate-d3, pH 6.0, 10% D2O, 10 mM sodium azide, 0.1 mM sodium trimethylsilylpropionate (TSP)	90% H2O/10% D2O	0.2 M	6.0	ambient	310
3	HNHA	1.5 mM CBM4-2 15N-labelled, and 13C,15N double labelled protein; 50 mM CaCl2, 50 mM sodium acetate-d3, pH 6.0, 10% D2O, 10 mM sodium azide, 0.1 mM sodium trimethylsilylpropionate (TSP)	90% H2O/10% D2O	0.2 M	6.0	ambient	310

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DRX	500
2	Bruker	DRX	600

NMR Refinement
Method	Details	Software
hybrid distance geometry/simulated annealing using XPLOR	The final set of restraints contained 1654 non-redundant unambiguous NOEs and 17 ambiguous NOEs, 93 dihedral angle restraints, 72 chi1 and 1 chi2 restraint, and 65 pairs of hydrogen bond restraints, plus 177 backbone dihedral restraints based on 13C shifts from TALOS.	Felix

NMR Ensemble Information
Conformer Selection Criteria	structures with acceptable covalent geometry,structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	12

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	Felix	2000	Molecular Simulations Inc.
2	structure solution	X-PLOR	3.1	Axel T. Brunger
3	refinement	X-PLOR	3.1	Axel T. Brunger