5MDF

The structure of the mature HIV-1 CA hexameric lattice with curvature parameters: tilt=23, twist=-6

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	11998
Reported Resolution (Å)	8.5
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 hexameric lattice. This reconstruction has hexamer-hexamer curvature parameters: tilt=23, twist=-6.
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.