Single particle cryoEM structure of a DARPin-aldolase platform in complex with GFP
ELECTRON MICROSCOPY
| Sample |
|---|
| DARPin-aldolase platform in complex with GFP |
| Sample Components |
| DARPin, Muscle-type aldolase chimeric fusion |
| Green fluorescent protein |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | HOMEMADE PLUNGER |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | Grids were frozen on a manual plunger at the Scripps Research Institute Core Microscopy Facility in a 4 degrees C cold room humidified to >95%. |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 236339 |
| Reported Resolution (Å) | 3 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C1 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 (5VY5, 5MA6, 5MA6) | ||||
| Refinement Space | |||||
| Refinement Protocol | RIGID BODY FIT | ||||
| Refinement Target | |||||
| Overall B Value | |||||
| Fitting Procedure | |||||
| Details | PDB models 5vy5 and 5ma6 were used as starting points. These models were mutated to match the sequence of the DARPin-aldolase platform in complex wit ... | ||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | GATAN K2 SUMMIT (4k x 4k) | GATAN K2 SUMMIT (4k x 4k) | GATAN K2 SUMMIT (4k x 4k) | ||||||
| Electron Dose (electrons/Å**2) | 2.3 | 2.3 | 1.1 | ||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | |
| Temperature (Kelvin) | |
| Microscope Model | FEI TITAN KRIOS |
| Minimum Defocus (nm) | 10000 |
| Maximum Defocus (nm) | 30000 |
| 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 | 165000 |
| Calibrated Magnification | |
| Source | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 300 |
| Imaging Details |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| IMAGE ACQUISITION | SerialEM | |
| IMAGE ACQUISITION | EPU | |
| CTF CORRECTION | CTFFIND | 4.1.10 |
| CTF CORRECTION | RELION | 3.0 beta 2 |
| MODEL FITTING | UCSF Chimera | 1.12 |
| INITIAL EULER ASSIGNMENT | RELION | 3.0 beta 2 |
| FINAL EULER ASSIGNMENT | RELION | 3.0 beta 2 |
| RECONSTRUCTION | RELION | 3.0 beta 2 |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| PHASE FLIPPING AND AMPLITUDE CORRECTION | First whole micrograph correction with CtfFind4. Then per particle CTF Refinement in Relion. | 851776 | Manually picked particles were used to generate references for autopicking. Particles from all three microscopy sessions were processed together. Microscope session 1 - 358,381 particles Microscope session 2 - 64,368 particles Microscope session 3 - 402,427 particles | |
