9SQ3 | pdb_00009sq3

Crystal structure of the Molybdenum-containing nitrogenase from Methanocaldococcus infernus refined to 1.21 A resolution - crystalline form B.


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 9SPZ 

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, SITTING DROP8.5293.15Samples were centrifuged at 13,000 x g for 3 min to remove macro-aggregates and dust, and crystallised inside an anaerobic chamber (N2/H2 (97:3%) atmosphere, 20 degree Celsius). Crystallisation was done by the sitting drop method in 96-Well MRC 2-Drop polystyrene Crystallisation Plates (SWISSCI) containing 90 uL of crystallisation solution in the reservoir. Crystals were obtained by mixing 0.7 uL of crystallisation solution with 0.7 uL of protein sample at 22.4 mg.ml-1. The crystallisation solution contained the following: 30 % v/v 2-methyl-2,4-pentanediol, 100 mM Tris pH 8.5, 500 mM Sodium chloride and 8 % w/v Polyethylene glycol 8,000 (Crystallisation solution of the JBScreen Wizard form Jena Bioscience, Germany).
Crystal Properties
Matthews coefficientSolvent content
2.448.76

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 68.504α = 74.49
b = 80.243β = 82.25
c = 105.744γ = 65.02
Symmetry
Space GroupP 1

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100PIXELDECTRIS PILATUS 6M2023-05-17MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONESRF BEAMLINE BM070.97951ESRFBM07

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
11.21101.86920.0740.0790.030.99912.97.1371908
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)
11.211.3574.51.0711.1540.4250.6691.77.3

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-Work (Depositor)R-Work (DCC)R-Free (Depositor)R-Free (DCC)Mean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTFREE R-VALUE1.2133.621.963710771877561.950.12210.12080.12880.1460.149717.71
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_d14.877
f_angle_d1.472
f_chiral_restr0.111
f_plane_restr0.021
f_bond_d0.013
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms14906
Nucleic Acid Atoms
Solvent Atoms2023
Heterogen Atoms291

Software

Software
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
autoPROCdata reduction
autoPROCdata scaling
PHASERphasing