1RK7

Solution structure of apo Cu,Zn Superoxide Dismutase: role of metal ions in protein folding

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	CBCA(CO)NH, HNCACB,HNCO,HN(CA)CO,13C H(C)CH-TOCSY,13CC(CO)NH-TOCSY,13C NOESY-HSQC	Apo SOD 2mM enriched in 15N and 13C	20mM phosphate buffer pH5.0, 10% D2O		5.0	1 atm	298
2	HNHA,HNHB,15N HSQC NOESY,15N HSQC	Apo SOD 2mM enriched in 15N	20mM phosphate buffer pH5.0, 10% D2O		5.0	1 atm	298
3	2D NOESY	Apo SOD 2mM	20mM phosphate buffer pH5.0, 10% D2O		5.0	1 atm	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600
2	Bruker	AVANCE	700
3	Bruker	AVANCE	800

NMR Refinement
Method	Details	Software
simulated annealing and restrained energy minimization in vacuum	The structures were calculated using the constraints: 2382 meaningful upper distance limits, 42 dihedral phi angles, 41 dihedral psi angles and 42 proton pairs stereospecifically assigned. The disulphide bridge between C57 and C146 was introduced with the upper and lower distances limits between the CB and SG atoms of the two side chains.	CALIBA

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy,target function
Conformers Calculated Total Number	400
Conformers Submitted Total Number	30

Additional NMR Experimental Information
Details	The solution structure of Apo SOD was determined using triple resonance three and bi dimensional and homonuclear bidimensional techniques

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CALIBA		Guenter et al.
2	structure solution	GLOMSA		Guenter et al.
3	structure solution	DYANA		Guenter et al.
4	refinement	Amber		Pearlman et al.
5	collection	XwinNMR
6	data analysis	PROCHECK-NMR AQUA		Laskowski et al.