Experiment: 1SOU

NMR structure of Aquifex aeolicus 5,10-methenyltetrahydrofolate synthetase: Northeast Structural Genomics Consortium Target QR46

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_NOESY	1 mM 5,10-methenyltetrahydrofolate synthetase U-15N,13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 10 mM DTT, 0.02% NaN3 pH 6.5 95% H2O, 5% D2O	95% H2O/5% D2O	0.115	6.5	ambient	298
2	3D_13C-separated_NOESY	1 mM 5,10-methenyltetrahydrofolate synthetase U-15N,13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 10 mM DTT, 0.02% NaN3 pH 6.5 95% H2O, 5% D2O	95% H2O/5% D2O	0.115	6.5	ambient	298
3	4D_13C-separated_NOESY	1 mM 5,10-methenyltetrahydrofolate synthetase U-15N,13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 10 mM DTT, 0.02% NaN3 pH 6.5 100% D2O	100% D2O	0.115	6.5	ambient	298
4	HNHA	1 mM 5,10-methenyltetrahydrofolate synthetase U-15N,13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 10 mM DTT, 0.02% NaN3 pH 6.5 95% H2O, 5% D2O	95% H2O/5% D2O	0.115	6.5	ambient	298

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

NMR Refinement
Method	Details	Software
MOLECULAR DYNAMICS, SIMULATED ANNEALING	FINAL REFINEMENT IN EXPLICIT SOLVENT WITH LEONARD-JONES AND ELECTROSTATIC POTENTIALS. BACKBONE AND SIDECHAIN ASSIGNMENTS WERE DETERMINED MANUALLY FROM TRIPLE-RESONANCE NMR DATA. NOE DISTANCE RESTRAINTS WERE DERIVED MANUALLY FROM NOESY DATA. THE STRUCTURE IS BASED ON 1235 RESTRAINTS: 938 NOE DISTANCE RESTRAINTS, 112 H-BOND RESTRAINTS (56 H-BONDS), AND 185 DIHEDRAL RESTRAINTS. PHI DIHEDRAL RESTRAINTS WERE DERIVED FROM THE HNHA EXPERIMENT AND TALOS. PSI DIHEDRAL RESTRAINTS WERE DERIVED FROM NOE RATIOS, SECONDARY STRUCTURE PROPENSITIES EVIDENT IN PRELIMINARY STRUCTURES, ALPHA CARBON CHEMICAL SHIFTS, AND TALOS. RESIDUES 1-2 AND 182-194 ARE UNSTRUCTURED TERMINI IN THIS ENSEMBLE.	NIH-XPLOR

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	29
Conformers Submitted Total Number	20
Representative Model	1 (combination of factors)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	NIH-XPLOR	2.0.4	AT Brunger, GM Clore, J Kuszewski, CD Schwieters, N Tjandra
2	refinement	CNS	1.1	AT Brunger
3	collection	VNMR	6.1C	Varian Inc.
4	data analysis	Felix	97	MSI/Biosym
5	data analysis	TALOS		G Cornilescu, F Delaglio, A Bax