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The structure of the mature HIV-1 CA hexameric lattice with curvature parameters: tilt=29, twist=0
ELECTRON MICROSCOPY
Sample
Human immunodeficiency virus 1
Specimen Preparation
Sample Aggregation State
PARTICLE
Vitrification Instrument
FEI VITROBOT MARK II
Cryogen Name
ETHANE
Sample Vitrification Details
10nm colloidal gold was added to the sample prior to plunge freezing
3D Reconstruction
Reconstruction Method
SUBTOMOGRAM AVERAGING
Number of Particles
7445
Reported Resolution (Å)
8.7
Resolution Method
FSC 0.143 CUT-OFF
Other Details
The final reconstruction is obtained by averaging, without further alignment, subtomograms that were selected based on the local curvature of the hexa ...
The final reconstruction is obtained by averaging, without further alignment, subtomograms that were selected based on the local curvature of the hexameric lattice. This reconstruction has hexamer-hexamer curvature parameters: tilt=29, twist=0.
Refinement Type
Symmetry Type
POINT
Point Symmetry
C1
Map-Model Fitting and Refinement
Id
1
Refinement Space
REAL
Refinement Protocol
RIGID BODY FIT
Refinement Target
Cross-correlation coefficient
Overall B Value
Fitting Procedure
Details
Data Acquisition
Detector Type
GATAN K2 QUANTUM (4k x 4k)
Electron Dose (electrons/Å**2)
2.2
Imaging Experiment
1
Date of Experiment
Temperature (Kelvin)
Microscope Model
FEI TITAN KRIOS
Minimum Defocus (nm)
2000
Maximum Defocus (nm)
6500
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
81000
Calibrated Magnification
Source
FIELD EMISSION GUN
Acceleration Voltage (kV)
300
Imaging Details
Nanoprobe
EM Software
Task
Software Package
Version
IMAGE ACQUISITION
SerialEM
CTF CORRECTION
IMOD
MODEL FITTING
UCSF Chimera
FINAL EULER ASSIGNMENT
AV3
FINAL EULER ASSIGNMENT
TOM Toolbox
RECONSTRUCTION
AV3
RECONSTRUCTION
TOM Toolbox
Image Processing
CTF Correction Type
CTF Correction Details
Number of Particles Selected
Particle Selection Details
PHASE FLIPPING ONLY
CTF correction was performed using the ctfphaseflip program in IMOD prior to backprojection.