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Single-Particle Cryo-EM Structure of Plasmodium falciparum Chloroquine Resistance Transporter (PfCRT) 7G8 Isoform
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 4XMM
Sample Plasmodium falciparum Chloroquine Resistance Transporter (PfCRT) 7G8 Isoform Complexed with Fab Sample Components Plasmodium falciparum Chloroquine Resistance Transporter (PfCRT) Antigen-binding fragment (Fab)
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument LEICA EM GP Cryogen Name ETHANE Sample Vitrification Details Blot for 2 seconds before plunging.
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 17030 Reported Resolution (Å) 3.3 Resolution Method FSC 0.143 CUT-OFF Other Details CisTEM was used to reconstruct the final map using original (non-signal subtracted) particles. Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (4XMM, 4XMM) Refinement Space REAL Refinement Protocol AB INITIO MODEL Refinement Target Overall B Value Fitting Procedure Details Rosetta was used to generate an ab initio model for the PfCRT using the map. 4XMM chains H and L were used as starting point to model the Fab.
Data Acquisition Detector Type GATAN K2 QUANTUM (4k x 4k) Electron Dose (electrons/Å**2) 91.56
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 1.2 Maximum Defocus (nm) 1.8 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 0.001 Imaging Mode BRIGHT FIELD Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER Nominal Magnification 215000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION Gautomatch 0.53 IMAGE ACQUISITION Leginon 3.4 CTF CORRECTION RELION 2.1 CTF CORRECTION cisTEM 1 CTF CORRECTION cryoSPARC 2 MODEL FITTING Coot MODEL REFINEMENT PHENIX INITIAL EULER ASSIGNMENT cryoSPARC 2 FINAL EULER ASSIGNMENT cryoSPARC 2 CLASSIFICATION cryoSPARC 2 RECONSTRUCTION cisTEM 1
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION CTF was estimated using GCTF and refined throughout the pipeline using cisTEM. 183241