6N4L

Dithionite-reduced ADP-bound form of the nitrogenase Fe-protein from A. vinelandii

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.5	298	40% PEG 400, 0.17 mM Cymal 7, 0.1 M HEPES pH 7.5, 5 mM dithionite

Crystal Properties
Matthews coefficient	Solvent content
2.08	41.01

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 45.587	α = 90
b = 74.63	β = 90
c = 75.398	γ = 90

Symmetry
Space Group	P 2 21 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	PIXEL	DECTRIS PILATUS 6M		2014-02-22	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL12-2	0.8856	SSRL	BL12-2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym I (Observed)	Rrim I (All)	Rpim I (All)	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	1.13	53.041	100	0.068	0.071	0.02	17.6	12.9		96897

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Rrim I (All)	Rpim I (All)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.13	1.19	99.9		0.799	0.799	0.835	0.239	1	11.9

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	1G5P	1.13	39.04	92016	4770	99.93	0.1464	0.1459	0.157	RANDOM	16.113

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]
-0.24			0.26		-0.02

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.199
r_dihedral_angle_4_deg	16.939
r_sphericity_free	14.403
r_dihedral_angle_3_deg	12.483
r_sphericity_bonded	6.865
r_dihedral_angle_1_deg	6.318
r_angle_refined_deg	1.466
r_angle_other_deg	1.389
r_rigid_bond_restr	0.822
r_chiral_restr	0.064

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.199
r_dihedral_angle_4_deg	16.939
r_sphericity_free	14.403
r_dihedral_angle_3_deg	12.483
r_sphericity_bonded	6.865
r_dihedral_angle_1_deg	6.318
r_angle_refined_deg	1.466
r_angle_other_deg	1.389
r_rigid_bond_restr	0.822
r_chiral_restr	0.064
r_bond_refined_d	0.007
r_gen_planes_refined	0.006
r_gen_planes_other	0.002
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2140
Nucleic Acid Atoms
Solvent Atoms	268
Heterogen Atoms	32

Software

Software
Software Name	Purpose
REFMAC	refinement
SCALA	data scaling
PDB_EXTRACT	data extraction
XDS	data reduction
PHASER	phasing

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.