2W3M

HUMAN DIHYDROFOLATE REDUCTASE COMPLEXED WITH NADPH AND FOLATE

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1DRF	PDB ENTRY 1DRF

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.75	277	HUMAN DHFR/FOLATE COMPLEX WAS MIXED WITH NADPH (2 MM FINAL). CRYSTALS WERE GROWN BY HANGING DROP VAPOR DIFFUSION AT 277 K BY MIXING EQUAL VOLUMES OF PROTEIN/NADPH/FOLATE WITH RESERVOIR (24% PEG 4000, 200 MM LI2SO4, 100 MM TRIS.HCL, PH 8.75). TRUNCATED TRIANGULAR CRYSTALS APPEARED SLOWLY, IN ABOUT A MONTH. THE CRYSTAL WAS CRYOPROTECTED WITH 15% GLYCEROL AND FLASH-COOLED IN LIQUID N2.

Crystal Properties
Matthews coefficient	Solvent content
2.35	47.72

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 88.552	α = 90
b = 94.269	β = 90
c = 96.681	γ = 90

Symmetry
Space Group	C 2 2 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	ADSC QUANTUM-1	MIRRORS	1996-06-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	CHESS BEAMLINE A1		CHESS	A1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.6	10.7	98.4	0.05	4.5	5.6		52618		-10	19.9

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.6	1.69	93.6		0.35	1.8	3.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1DRF	1.6	10.7	49931	2660	98.1	0.169	0.167	0.208	RANDOM	14.09

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]
0.01			0.05		-0.06

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.505
r_dihedral_angle_4_deg	11.845
r_dihedral_angle_3_deg	11.565
r_dihedral_angle_1_deg	5.917
r_scangle_it	3.148
r_scbond_it	2.47
r_mcangle_it	1.592
r_angle_refined_deg	1.583
r_mcbond_it	1.343
r_angle_other_deg	1.233
r_symmetry_vdw_refined	0.256
r_nbd_refined	0.2
r_symmetry_vdw_other	0.196
r_nbd_other	0.19
r_symmetry_hbond_refined	0.179
r_nbtor_refined	0.174
r_xyhbond_nbd_refined	0.15
r_chiral_restr	0.096
r_nbtor_other	0.081
r_bond_refined_d	0.013
r_gen_planes_refined	0.007
r_gen_planes_other	0.002
r_bond_other_d	0.001
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2946
Nucleic Acid Atoms
Solvent Atoms	494
Heterogen Atoms	160

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
Agrovata	data scaling
AMoRE	phasing