2HM9

Solution structure of dihydrofolate reductase complexed with trimethoprim, 33 structures

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_NOESY	1mM DHFR-15N/TMP, 50mM phosphate buffer, 90% H2O, 10% D2O	90% H2O/10% D2O	100mM KCl	6.5	ambient	308
2	2D NOESY	1mM DHFR-15N/TMP, 50mM phosphate buffer, 90% H2O, 10% D2O	90% H2O/10% D2O	100mM KCl	6.5	ambient	308
3	2D NOESY	1mM DHFR-15N/TMP, 50mM phosphate buffer	100% D2O	100mM KCl	6.5	ambient	308
4	2D 15N rejected NOESY	1mM DHFR-15N/TMP, 50mM phosphate buffer, 90% H2O, 10% D2O	90% H2O/10% D2O	100mM KCl	6.5	ambient	308
5	J-modulated N15,1H-HSQC	0.5mM DHFR-15N/TMP, 50mM phosphate buffer, 5% DMPC/DHPC (3:1), 90% H2O, 10% D2O	90% H2O/10% D2O	100mM KCl	6.5	ambient	308

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

NMR Refinement
Method	Details	Software
simulated annealing	Annealing from 1000K down to 0K with 25K step, 10ps trajectory on each step	VNMR

NMR Ensemble Information
Conformer Selection Criteria	all calculated structures submitted
Conformers Calculated Total Number	33
Conformers Submitted Total Number	33
Representative Model	1 (closest to the average)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1	Varian Inc
2	processing	NMRPipe	1998-2001	Delaglio
3	data analysis	Sparky	3.8	UCSF
4	refinement	XPLOR-NIH	3.11	Clore
5	refinement	CNS	1.0	Brunger

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 R01GM157729.