1JOK

Averaged structure for Staphylococcal nuclease-H124L in ternary complex with Ca2+ and thymidine-3',5'-bisphosphate

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	E-COSY	3.5-5 mM Nuclease-H124L U-50% 2H; 300 mM KCl; D2O	D2O	300 nM KCl	5.5	ambient	318
2	HMQC-J	3.5-5 mM Nuclease-H124L U-95% 15N; 300 mM KCl; H2O	H2O	300 nM KCl	5.1	ambient	318
3	DQF-COSY	3.5-5 mM Nuclease-H124L; 300 mM KCl; D2O	D2O	300 nM KCl	5.5	ambient	318
4	2D NOESY	3.5-5 mM Nuclease-H124L U-50% 2H; 300 mM KCl; D2O	D2O	300 nM KCl	5.5	ambient	318
5	2D NOESY	3.5-5 mM Nuclease-H124L U-50% 2H; 300 mM KCl; H2O	H2O	300 nM KCl	5.1	ambient	318
6	3D 1H-15N NOESY-HMQC	3.5-5 mM Nuclease-H124L U-95% 15N; 300 mM KCl; H2O	H2O	300 nM KCl	5.1	ambient	318
7	3D HMQC-NOESY-HMQC	3.5-5 mM Nuclease-H124L U-95% 15N; 300 mM KCl; H2O	H2O	300 nM KCl	5.1	ambient	318
8	2D 1H-13C HMQC	3.5-5 mM Nuclease-H124L U-98% 13C; 300 mM KCl; H2O	H2O	300 nM KCl	5.1	ambient	318
9	HNCO	3.5-5 mM Nuclease-H124L U-98% 13C U-99% 15N; 300 mM KCl; H2O	H20	300 nM KCl	5.1	ambient	318
10	and others	3.5-5 mM Nuclease-H124L U-50% 2H; 300 mM KCl; D2O	D2O	300 nM KCl	5.5	ambient	318

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

NMR Refinement
Method	Details	Software
Distance, hydrogen bond and torsion angle constraints	2261 constraints were used to calculate the structure. Ca2+ is bound, but coordinates for the calcium are not provided.	Felix

NMR Ensemble Information
Conformer Selection Criteria
Conformers Calculated Total Number
Conformers Submitted Total Number	1
Representative Model	(minimized average structure)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	Felix		Biosym Technologies Inc
2	structure solution	X-PLOR	3.1	Brunger
3	structure solution	Insight II	2.3	Biosym Technologies Inc
4	structure solution	HBPLUS		McDonald and Thornton
5	refinement	X-PLOR	3.1	Brunger