1XJS

Solution structure of Iron-Sulfur cluster assembly protein IscU from Bacillus subtilis, with Zinc bound at the active site. Northeast Structural Genomics Consortium Target SR17

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D-TOCSYS	20mM Sodium Phosphate, 50mM Sodium Chloride, 10mM DTT, 0.02% NaN3, 95% H2O, 5% D2O	95% H2O/5% D2O	100mM	6.5	ambient	293
2	13C,1H-HSQC	20mM Sodium Phosphate, 50mM Sodium Chloride, 10mM DTT, 0.02% NaN3, 95% H2O, 5% D2O	95% H2O/5% D2O	100mM	6.5	ambient	293
3	15N,1H-HSQC	20mM Sodium Phosphate, 50mM Sodium Chloride, 10mM DTT, 0.02% NaN3, 95% H2O, 5% D2O	95% H2O/5% D2O	100mM	6.5	ambient	293
4	13C,1H-HSQC	100mM Potassium Phosphate, 200mM Glycerol, 1mM DTT, 0.02% NaN3	5% D2O, 95% H2O	100mM	6.5	ambient	293
5	15N,1H-HSQC, 2D Homonuclear NOESY	100mM Potassium Phosphate, 200mM Glycerol, 1mM DTT, 0.02% NaN3	5% D2O, 95% H2O	100mM	6.5	ambient	293
6	4D_13C-separated_NOESY	100mM Potassium Phosphate, 200mM Glycerol, 1mM DTT, 0.02% NaN3	5% D2O, 95% H2O	100mM	6.5	ambient	293
7	3D_13C-separated_NOESY	100mM Potassium Phosphate, 200mM Glycerol, 1mM DTT, 0.02% NaN3	5% D2O, 95% H2O	100mM	6.5	ambient	293
8	3D_15N-separated_NOESY	100mM Potassium Phosphate, 200mM Glycerol, 1mM DTT, 0.02% NaN3	5% D2O, 95% H2O	100mM	6.5	ambient	293
9	H/D exchange	20mM Sodium Phosphate, 50mM Sodium Chloride, 10mM DTT, 0.02% NaN3, 95% H2O, 5% D2O	95% H2O/5% D2O	100mM	6.5	ambient	293

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	750
2	Varian	INOVA	800
3	Varian	INOVA	600

NMR Refinement
Method	Details	Software
Minimal constraint structure contained 492 conformationally restricting NOE-derived distance constraints, 108 hydrogen bond constraints, and 197 dihedral angle constraints. This resulted in 5.9 constraints per residue and 1.2 long range constraints per residue. Structure determination was performed with the following steps: AutoStructure-Dyana was used to identify distance constraints. These distance constraints were used as input into a Simulated Annealing with Xplor-NIH. The top ten structures were energy minimized with water using CNS.		AutoAssign

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	60
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	This structure was determined using a selective isotopic labeling strategy involving the protonation of specific residues in a perdeuterated background. Protonated atoms include: ile HD1, val HG, leu HD. All tyr and phe side-chains are protonated. In addition to the atoms mentioned above, exchangeable atoms were protonated.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	data analysis	AutoAssign	1.9	Zimmerman, Moseley and Montelione
2	structure solution	AutoStructure	2.0.0	Huang and Montelione
3	structure solution	TALOS	2.1	Cornilescu, Delaglio and Bax
4	structure solution	Hyper & PDBstat	3.2 and 3.32	Tejero and Montelione
5	processing	NMRPipe	2.1	Delaglio et al.
6	refinement	X-PLOR	2.0.6	Schwieters, et al.
7	refinement	CNS	1.0	Brunger, et al.
8	data analysis	Sparky	3.106	Goddard

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.