1L3N

The Solution Structure of Reduced Dimeric Copper Zinc SOD: the Structural Effects of Dimerization

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D HNCA, 3D NH(CO)CA, 3D HNCO, 3D HN(CA)CO-TROSY like, 2D 15N-HSQC, 2D 13C-HSQC, 3D 13C-NOESY-HSQC	Cu(I),Zn(II) SOD 2mM enriched in 15N, 13C and 2H at 70%	20mM phosphate buffer pH5.00 10% D2O, 8mM ascorbate reductant
2	3D H(C)CH-TOCSY, 3D (H)CCH-TOCSY	Cu(I),Zn(II) SOD 2mM enriched in 15N, 13C	20mM phosphate buffer pH5.00 10% D2O, 8mM ascorbate reductant
3	3D 15N-NOESY-HSQC, 3D HNHA, 3D HNHB, 2D NOESY	Cu(I),Zn(II) SOD 2mM enriched in 15N	20mM phosphate buffer pH5.00 10% D2O, 8mM ascorbate reductant		5.0	1 atm	296
4	2D NOESY	Cu(I),Zn(II) SOD 2mM enriched in 15N	20mM phosphate buffer pH5.00 10% D2O, 8mM ascorbate reductant		5.0	1 atm	286
5	2D 15N-HSQC	Cu(I),Zn(II) SOD 2mM enriched in 15N	20mM phosphate buffer pH5.00 100% D2O, 8mM ascorbate reductant		5.0	1 atm	296

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

NMR Refinement
Method	Details	Software
simulated annealing and restrained enegy minimization in vacuum	The structures were calculated using the constraints: 3566 NOE cross peaks were converted into distance constraints, 49 dihedral phi angles, 52 dihedral psi angles, 14 chi angles and 45 proton pairs stereospecifically assigned. The Cu(I) and Zn(II) metal ions were included in the calculation with special linkers. The disulfide bridge between Cys57 and Cys146 was introduced with upper and lower distance limits between the CB and SG atoms of the two side chains.	CALIBA

NMR Ensemble Information
Conformer Selection Criteria	structure with the lowest energy target function
Conformers Calculated Total Number	1400
Conformers Submitted Total Number	30

Additional NMR Experimental Information
Details	Cu(I), Zn(II) SOD structure was determined using triple resonance three-and bi-dimensional and homonuclear bi-dimensional 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		Laskowski et al.

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.