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CryoEM structure of Azotobacter vinelandii nitrogenase complex (1:1 FeP:MoFeP, ATP-bound) during catalytic N2 reduction
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 4WZA
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 9.908 f_angle_d 1.032 f_chiral_restr 0.744 f_bond_d 0.014 f_plane_restr 0.004
Sample Azotobacter vinelandii nitrogenase complex (1:1 FeP:MoFeP, ATP-bound) during catalytic N2 reduction
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument HOMEMADE PLUNGER Cryogen Name ETHANE-PROPANE Sample Vitrification Details Custom manual plunger.
Greater than 95% humidity.
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 38099 Reported Resolution (Å) 2.43 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (4WZA) Refinement Space REAL Refinement Protocol RIGID BODY FIT Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type GATAN K3 (6k x 4k) Electron Dose (electrons/Å**2) 65
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model TFS KRIOS Minimum Defocus (nm) 1200 Maximum Defocus (nm) 2000 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 2.7 Imaging Mode BRIGHT FIELD Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER Nominal Magnification 135000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version IMAGE ACQUISITION EPU 2.8 CTF CORRECTION CTFFIND 4.1 MODEL FITTING PHENIX MODEL REFINEMENT PHENIX MODEL REFINEMENT Coot INITIAL EULER ASSIGNMENT RELION 4.0/beta2 FINAL EULER ASSIGNMENT RELION 4.0/beta2 CLASSIFICATION cryoSPARC 3.32 RECONSTRUCTION cryoSPARC 3.3.2
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING ONLY 19711170