9R9H | pdb_00009r9h

Cryo-EM structure of an extracellular contractile injection system in Salmonella enterica subspecies salamae, the sheath and inner tube module in extended state.

ELECTRON MICROSCOPY

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Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	14.4744
f_angle_d	0.6798
f_chiral_restr	0.0525
f_bond_d	0.0349
f_plane_restr	0.0033

Sample
Helical complex of the sheath and inner tube module of a contractile injection system

Specimen Preparation
Sample Aggregation State	HELICAL ARRAY
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	HELICAL
Number of Particles	136877
Reported Resolution (Å)	2.28
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	HELICAL
Axial Symmetry	C6
Axial Rise	39.2
Angular Rotation	21.6

Map-Model Fitting and Refinement
Id	1
Refinement Space
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	FEI FALCON IV (4k x 4k)
Electron Dose (electrons/Å**2)	41

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	TFS KRIOS
Minimum Defocus (nm)	500
Maximum Defocus (nm)	2500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	cryoSPARC	4
MODEL REFINEMENT	PHENIX	1.21_5207
IMAGE ACQUISITION	EPU
CTF CORRECTION	cryoSPARC	4
CLASSIFICATION	cryoSPARC	4
RECONSTRUCTION	cryoSPARC	4

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		142404