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 hexa ... |
| 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. | |||
