Structure of a mammalian ribosomal termination complex with ABCE1, eRF1(AAQ), and the UAG stop codon
ELECTRON MICROSCOPY
| Sample |
|---|
| 80S ribosome-nascent chain complex containing the UAG stop codon bound to eRF1(AAQ) and ABCE1 |
| Sample Components |
| 80S ribosome |
| eukaryotic release factor 1, G183A, G184A mutant |
| ATP binding cassette E1 |
| messenger RNA |
| in vitro translated substrate |
| tRNA |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | FEI VITROBOT MARK III |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | After 30 second wait time, blot for 3 seconds before plunging into liquid ethane (FEI VITROBOT MARK III). |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 20515 |
| Reported Resolution (Å) | 3.45 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C1 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 (3J92, 3J7P, 1DT9) | 2 (3BK7) | 3 (4V51) | ||
| Refinement Space | RECIPROCAL | RECIPROCAL | RECIPROCAL | ||
| Refinement Protocol | FLEXIBLE FIT | FLEXIBLE FIT | FLEXIBLE FIT | ||
| Refinement Target | |||||
| Overall B Value | |||||
| Fitting Procedure | |||||
| Details | REFINEMENT PROTOCOL--flexible | REFINEMENT PROTOCOL--flexible DETAILS--Sequence was modified in Coot to agree with rabbit sequence. | REFINEMENT PROTOCOL--flexible DETAILS--Sequence was modified in Coot to agree with the most prevalent tRNA sequence for each particular codon. | ||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | FEI FALCON II (4k x 4k) | ||||||||
| Electron Dose (electrons/Å**2) | 30 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | 2015-02-25 |
| Temperature (Kelvin) | |
| Microscope Model | FEI TITAN KRIOS |
| Minimum Defocus (nm) | 1700 |
| Maximum Defocus (nm) | 3600 |
| Minimum Tilt Angle (degrees) | |
| Maximum Tilt Angle (degrees) | |
| Nominal CS | 2.7 |
| Imaging Mode | BRIGHT FIELD |
| Specimen Holder Model | |
| Nominal Magnification | 59000 |
| Calibrated Magnification | 104478 |
| Source | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 300 |
| Imaging Details | Automated data acquisition using EPU (FEI) |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| CTF CORRECTION | CTFFIND | 3 |
| MODEL FITTING | Coot | |
| MODEL FITTING | UCSF Chimera | |
| RECONSTRUCTION | RELION | |
