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The structure of the mammalian Sec61 channel opened by a signal sequence
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 3J7Q experimental model PDB 1RH5
Sample Sec61 protein conducting channel opened by the pre-prolactin signal sequence Sample Components Sec61 alpha Sec61 gamma Sec61 beta Pre-prolactin nascent chain
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK I Cryogen Name ETHANE Sample Vitrification Details 3 uL sample was added to the grid, incubated for 30 seconds at 4 C, blotted for 9 seconds, and then plunged into liquid ethane (FEI VITROBOT).
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 101339 Reported Resolution (Å) 3.6 Resolution Method Other Details Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (3J7Q, 1RH5) Refinement Space REAL Refinement Protocol Refinement Target R-factor Overall B Value Fitting Procedure Details DETAILS--Real-space fitting using Chimera and Coot followed by reciprocal-space
refinement using REFMAC
Data Acquisition Detector Type FEI FALCON II (4k x 4k) Electron Dose (electrons/Å**2) 27
Imaging Experiment 1 Date of Experiment 2015-03-06 Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 2000 Maximum Defocus (nm) 3500 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS Imaging Mode BRIGHT FIELD Specimen Holder Model Nominal Magnification 59000 Calibrated Magnification 104478 Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version MODEL FITTING Coot MODEL FITTING REFMAC MODEL FITTING UCSF Chimera RECONSTRUCTION RELION