Experiment: 6QX3

Influenza A virus (A/NT/60/1968) polymerase Hetermotrimer in complex with 3'5' cRNA promoter and Nb8205

ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	6QPG

Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	8.4769
f_angle_d	0.7338
f_chiral_restr	0.043
f_bond_d	0.005
f_plane_restr	0.0033

Sample
Influenza A virus (A/NT/60/1968) polymerase Hetermotrimer in complex with 3'5' cRNA promoter and Nb8205

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	blot for 3.5 sec before plunging

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	52932
Reported Resolution (Å)	3.79
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (6QPG)
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target
Overall B Value	110
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	1.25

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	1300
Maximum Defocus (nm)	2500
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	130000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	cryoSPARC	2.5
IMAGE ACQUISITION	EPU
CTF CORRECTION	Gctf	1.18
MODEL FITTING	UCSF Chimera	1.13
INITIAL EULER ASSIGNMENT	RELION	3
FINAL EULER ASSIGNMENT	RELION	3
CLASSIFICATION	RELION	3
RECONSTRUCTION	RELION	3
MODEL REFINEMENT	PHENIX	1.14

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		505860	template picking in cryosparc v2.5