8POH
Influenza A/H7N9 polymerase symmetric dimer bound to the promoter (PA K289A/C489R)
ELECTRON MICROSCOPY
Starting Model(s)
Initial Refinement Model(s) | |||
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Type | Source | Accession Code | Details |
experimental model | PDB | 7Z4O |
Refinement
RMS Deviations | |
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Key | Refinement Restraint Deviation |
f_dihedral_angle_d | 5.503 |
f_angle_d | 0.766 |
f_chiral_restr | 0.036 |
f_bond_d | 0.007 |
f_plane_restr | 0.004 |
Sample |
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Influenza A/H7N9 polymerase in replicase-like conformation in pre-initiation state with Pol II pS5 CTD peptide mimic bound in site 1A/2A |
Sample Components |
Polymerase acidic protein, RNA-directed RNA polymerase catalytic subunit and Polymerase basic protein 2 |
51-mer vRNA loop (v51_mut_S) |
Specimen Preparation | |
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Sample Aggregation State | PARTICLE |
Vitrification Instrument | FEI VITROBOT MARK IV |
Cryogen Name | ETHANE |
Sample Vitrification Details |
3D Reconstruction | |
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Reconstruction Method | SINGLE PARTICLE |
Number of Particles | 278761 |
Reported Resolution (Å) | 3.3 |
Resolution Method | FSC 0.143 CUT-OFF |
Other Details | |
Refinement Type | |
Symmetry Type | POINT |
Map-Model Fitting and Refinement | |||||
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Id | 1 (7Z4O) | ||||
Refinement Space | REAL | ||||
Refinement Protocol | |||||
Refinement Target | |||||
Overall B Value | |||||
Fitting Procedure | |||||
Details |
Data Acquisition | |||||||||
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Detector Type | FEI FALCON IV (4k x 4k) | ||||||||
Electron Dose (electrons/Å**2) | 40 |
Imaging Experiment | 1 |
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Date of Experiment | |
Temperature (Kelvin) | |
Microscope Model | TFS GLACIOS |
Minimum Defocus (nm) | 800 |
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 | |
Calibrated Magnification | |
Source | FIELD EMISSION GUN |
Acceleration Voltage (kV) | 200 |
Imaging Details |
EM Software | ||
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Task | Software Package | Version |
PARTICLE SELECTION | cryoSPARC | 3.3 |
IMAGE ACQUISITION | EPU | |
CTF CORRECTION | cryoSPARC | 3.3 |
MODEL FITTING | UCSF Chimera | |
INITIAL EULER ASSIGNMENT | cryoSPARC | 3.3 |
FINAL EULER ASSIGNMENT | cryoSPARC | 4.0 |
CLASSIFICATION | cryoSPARC | 4.0 |
RECONSTRUCTION | cryoSPARC | 4.0 |
MODEL REFINEMENT | PHENIX | |
Image Processing | ||||
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CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
PHASE FLIPPING AND AMPLITUDE CORRECTION |