1LUD

SOLUTION STRUCTURE OF DIHYDROFOLATE REDUCTASE COMPLEXED WITH TRIMETHOPRIM AND NADPH, 24 STRUCTURES

SOLUTION NMR

---

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_NOESY	3mM DHFR-15N/TMP/NADPH, 50 mM phosphate buffer	90% H2O/10% D2O	100 mM KCl	6.5	ambient	308
2	HNHA	3mM DHFR-15N/TMP/NADPH, 50 mM phosphate buffer	90% H2O/10% D2O	100 mM KCl	6.5	ambient	308
3	3D_15N-separated_ROESY	3mM DHFR-15N/TMP/NADPH, 50 mM phosphate buffer	90% H2O/10% D2O	100 mM KCl	6.5	ambient	308
4	2D_N15-rejected_NOESY	3mM DHFR-15N/TMP/NADPH, 50 mM phosphate buffer	90% H2O/10% D2O	100 mM KCl	6.5	ambient	308
5	2D NOESY	3 mM DHFR/TMP/NADPH, 50 mM phosphate buffer	100% D2O	100 mM KCl	6.5	ambient	308
6	DQF-COSY	3 mM DHFR/TMP/NADPH, 50 mM phosphate buffer	100% D2O	100 mM KCl	6.5	ambient	308
7	J-modulated N15, H1-HSQC	0.5mM DHFR-15N/TMP/NADPH, 50 mM phosphate buffer, 5% DMPC/DHPC (3:1)	90% H2O/10% D2O	100 mM KCl	6.5	ambient	308
8	J-modulated N15, H1-HSQC	0.25mM DHFR-15N/TMP/NADPH, 50 mM phosphate buffer, 5% C12E5/hexanol	90% H2O/10% D2O	100 mM KCl	6.5	ambient	308

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITYPLUS	500
2	Varian	UNITY	600
3	Varian	INOVA	600

NMR Refinement
Method	Details	Software
simulated annealing	10 ps at 1000K, 40 ps cooling from 1000 to 0K, 1000 steps of EM	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	32
Conformers Submitted Total Number	24
Representative Model	1 (closest to the average)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1	Varian
2	processing	NMRPipe	1998-2001	Delaglio
3	structure solution	CNS	0.9	Brunger
4	refinement	CNS	1.0	Brunger