3IV9

Structure of the B12-dependent Methionine Synthase (MetH) C-teminal half in a "His-On" conformation

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	7.5	302	0.2 M potassium nitrate, 20 % (w/v) PEG3350, 50 mM HEPES pH 7.5, VAPOR DIFFUSION, temperature 302K

Crystal Properties
Matthews coefficient	Solvent content
3.21	61.71

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 107.55	α = 90
b = 107.55	β = 90
c = 144.8	γ = 90

Symmetry
Space Group	P 43 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MAR scanner 300 mm plate	K-B pair of biomorph mirrors for vertical and horizontal focusing	2007-04-02	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 23-ID-B	0.9793	APS	23-ID-B

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	3.25	50	99.9	0.092	0.088	19.44	9.5	13886	13890

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	3.25	3.44	99.9		0.604	0.778	3.17	9.5

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	Individual domains of PDB entry 3BUL	3.25	48.1	13846	13846	693	99.1	0.282	0.282	0.321	RANDOM	113.2

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]
2.21			2.21		-4.41

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	21.4
c_improper_angle_d	4.14
c_scangle_it	2.61
c_mcangle_it	2.4
c_scbond_it	1.55
c_mcbond_it	1.34
c_angle_deg	1.1
c_bond_d	0.008
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	4572
Nucleic Acid Atoms
Solvent Atoms	22
Heterogen Atoms	91

Software

Software
Software Name	Purpose
Blu-Ice	data collection
PHENIX	model building
CNS	refinement
XDS	data reduction
XDS	data scaling
PHENIX	phasing