1FMF

REFINED SOLUTION STRUCTURE OF THE (13C,15N-LABELED) B12-BINDING SUBUNIT OF GLUTAMATE MUTASE FROM CLOSTRIDIUM TETANOMORPHUM

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1.5mM MutS U-98% 15N,13C; 11mM phosphate buffer;	90% H2O/10% D2O	11mM KXH3-XPO4	6.0	1 atm	299
2	3D_13C-separated_NOESY	1.5mM MutS U-98% 15N,13C; 11mM phosphate buffer;	90% H2O/10% D2O	11mM KXH3-XPO4	6.0	1 atm	299
3	3D_15N-separated_NOESY	1.5mM MutS U-98% 15N,13C; 11mM phosphate buffer;	90% H2O/10% D2O	11mM KXH3-XPO4	6.0	1 atm	299

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITYPLUS	500

NMR Refinement
Method	Details	Software
distance geometry, simulated annealing, simulated annealing refinement, energy minimization	The MutS structure models 1-15 are based on a total of 1792 restraints, 1553 are NOE-derived distance constraints, 184 dihedral angle restraints, 55 distance restraints from hydrogen bonds. Backbone dihedral angles Phi and Psi were obtained by employing TALOS software [G. Cornilescu et al., J. Biomol. NMR 1999, 13, 289-302]. Phi and Psi torsion angle restraints for the MutS residues 23-30, which form a "nascent" helix [M. Tollinger et al., Structure 1998, 6, 1021-1033], were not used in structure calculations for MutS models 16-30.	NMRPipe

NMR Ensemble Information
Conformer Selection Criteria	structures with acceptable covalent geometry,structures with favorable non-bond energy,structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	200
Conformers Submitted Total Number	30
Representative Model	16 (fewest violations)

Additional NMR Experimental Information
Details	The structure was determined using triple-resonance NMR spectroscopy.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	NMRPipe		Delaglio
2	data analysis	ANSIG	3.3	Kraulis
3	structure solution	X-PLOR	3.8.5.1	Bruenger
4	data analysis	TALOS	98.040.21.02	Cornilescu
5	refinement	X-PLOR	3.8.5.1	Bruenger

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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.