8P8G

Nitrogenase MoFe protein from A. vinelandii beta double mutant D353G/D357G


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 3U7Q 

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, SITTING DROP5.6293.15The beta-D353G/D357G MoFe-protein was crystallized anaerobically at 17.5 mg/mL under 100% N2 atmosphere. The protein was spotted as a sitting drop to 96-Well MRC 2-Drop polystyrene Crystallization Plates (SWISSCI) containing 90 uL of crystallization solution in the reservoir. Each drop contained 0.5 uL of protein sample and 0.5 uL of crystallization solution. Crystals were obtained in the crystallization solution containing 10 % w/v Polyethylene glycol 10,000; 2 % v/v 1,4-Dioxane; 100 mM tri-Sodium citrate; pH 5.6, and 1 mM polyoxotungstate [TeW6O24]6- (TEW). Sealed plates were stored inside a Coy anaerobic chamber filled with an atmosphere of N2:H2 97:3 at 20 C. Crystals were soaked in the crystallization solution supplemented with 30% v/v ethylene glycol for a few seconds before freezing in liquid nitrogen.
Crystal Properties
Matthews coefficientSolvent content
2.7455.06

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 167.486α = 90
b = 74.469β = 103.25
c = 208.467γ = 90
Symmetry
Space GroupC 1 2 1

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100PIXELDECTRIS PILATUS 2M-F2021-10-16MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONSLS BEAMLINE X06DA1.00002SLSX06DA

Data Collection

Overall
ID #Resolution (High)Resolution (Low)Percent Possible (Observed)R Merge I (Observed)Rrim I (All)Rpim I (All)CC (Half)Net I Over Average Sigma (I)RedundancyNumber Reflections (All)Number Reflections (Observed)Observed Criterion Sigma (F)Observed Criterion Sigma (I)B (Isotropic) From Wilson Plot
11.55101.46940.1770.1890.0660.9958.18.117604314
Highest Resolution Shell
ID #Resolution (High)Resolution (Low)Percent Possible (All)Percent Possible (Observed)R Merge I (Observed)Rrim I (All)Rpim I (All)CC (Half)Mean I Over Sigma (Observed)RedundancyNumber Unique Reflections (All)
11.551.7680.51.892.0010.6520.5661.89.3

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodResolution (High)Resolution (Low)Cut-off Sigma (F)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (Observed)R-WorkR-FreeMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTFREE R-VALUE1.5548.321.33175938876348.690.15660.1550.187218.62
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]
RMS Deviations
KeyRefinement Restraint Deviation
f_dihedral_angle_d15.629
f_angle_d1.035
f_chiral_restr0.061
f_bond_d0.012
f_plane_restr0.01
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms15912
Nucleic Acid Atoms
Solvent Atoms2176
Heterogen Atoms285

Software

Software
Software NamePurpose
PHENIXrefinement
autoPROCdata reduction
autoPROCdata scaling
PHASERphasing