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Human 20S proteasome bound to an engineered 11S (PA26) activator
Sample PA26-bound proteasome Sample Components Proteasome mutant PA26
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument HOMEMADE PLUNGER Cryogen Name ETHANE Sample Vitrification Details Specimens were manually blotted with Whatman #1 filter paper.
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 234960 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 Refinement Space REAL Refinement Protocol RIGID BODY FIT Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type GATAN K2 SUMMIT (4k x 4k) Electron Dose (electrons/Å**2) 50
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) -1000 Maximum Defocus (nm) -2500 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 29000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details Images were acquired in nanoprobe mode.
EM Software Task Software Package Version PARTICLE SELECTION RELION 2.1 IMAGE ACQUISITION Leginon 3.2 CTF CORRECTION MotionCorr2 2 CTF CORRECTION RELION 2.1 CTF CORRECTION CTFFIND 4 CTF CORRECTION Gctf MODEL FITTING UCSF Chimera 1.12 MODEL FITTING PHENIX 1.11-2580 INITIAL EULER ASSIGNMENT RELION 2.1 FINAL EULER ASSIGNMENT RELION 2.1 RECONSTRUCTION RELION 2.1 MODEL REFINEMENT PHENIX 1.11-2580
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION CTF correction was performed by Relion during reconstruction. 579361 Particles were selected using the Relion template-based particle picker.