1ZRQ

Escherichia coli Methylenetetrahydrofolate Reductase (reduced) complexed with NADH, pH 6.0

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1B5T	PDB ENTRY 1B5T

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6	295	PEG 4000, LITHIUM SULFATE, SODIUM CACODYLATE, ETHANOL, MESO-ERYTHRITOL, VAPOR DIFFUSION, HANGING DROP, temperature 295.0K, pH 6.00

Crystal Properties
Matthews coefficient	Solvent content
2.69	54.2

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 102.187	α = 90
b = 128.155	β = 120.94
c = 96.861	γ = 90

Symmetry
Space Group	C 1 2 1

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		2002-05-23	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 14-BM-C		APS	14-BM-C

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	2.2	20	100	0.065	11.9	2.34		54123			26.1

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.2	2.28	99.9		0.274	2.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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 1B5T	2.2	20	54129	54123	5516	99.9	0.219	0.219	0.252	RANDOM	35.1

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]
0.94		-4.21	1.53		-2.47

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	22
c_scangle_it	2.78
c_mcangle_it	2.01
c_scbond_it	1.86
c_angle_deg	1.3
c_mcbond_it	1.21
c_improper_angle_d	0.83
c_bond_d	0.007
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6451
Nucleic Acid Atoms
Solvent Atoms	262
Heterogen Atoms	311

Software

Software
Software Name	Purpose
CNS	refinement
Adxv	data processing
SCALEPACK	data scaling
EPMR	phasing