1YHO

Solution structure of human dihydrofolate reductase complexed with trimethoprim and nadph, 25 structures

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
2	2D COSY	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
3	15N-HSQC	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
4	13C-HSQC	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
5	13C-NOESY-HSQC	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
6	15N-NOESY-HSQC	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
7	15N-REJECTED-NOESY	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
8	13C-REJECTED-NOESY	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
9	HNCA	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
10	HNCO	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
11	HN(CO)CA	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
12	HNCACB	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
13	CBCA(CO)NH	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
14	HBHA(CO)NH	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288
15	HCCH-TOCSY	Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C, U-98% 15N, 1 mM; NADPH 1mM, trimethoprime 1mM; 50mM phosphate buffer	50 mm phosphate buffer	100 mM KCl	6.5	1 atm	288

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

NMR Refinement
Method	Details	Software
simulated annealing, molecular dynamics	High temp (1000 K) stage: 30 ps (10000 seps), 1000 -> 0 K cooling (25 K step, 30ps trajectory on each step). 700 steps of final energy optimization.	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	40
Conformers Submitted Total Number	25
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	Backbone assigment was performed using triple-resonance NMR spectroscopy.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	Varian Inc	6.1
2	processing	NMRPipe	Delaglio	1998-2001
3	refinement	CNS	Brunger	1.1
4	data analysis	Sparky	Goddard	3.5
5	refinement	ARIA		2.0a

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.