- EMDB-9961: Thermococcus kodakarensis RNA polymerase in complex with transcri... -
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Basic information
Entry
Database: EMDB / ID: EMD-9961
Title
Thermococcus kodakarensis RNA polymerase in complex with transcription factor E
Map data
Cryo-EM single particle analysis 3D reconstruction of RNA polymerase (RNAP) from Thermococcus kodakarensis (Tko), in complex with transcription factor E (TFE)
Sample
Complex: Thermococcus kodakarensis RNA polymerase in complex with transcription factor E
Download / File: emd_9961.map.gz / Format: CCP4 / Size: 20.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotation
Cryo-EM single particle analysis 3D reconstruction of RNA polymerase (RNAP) from Thermococcus kodakarensis (Tko), in complex with transcription factor E (TFE)
Film or detector model: FEI FALCON II (4k x 4k) / Detector mode: INTEGRATING / Digitization - Frames/image: 1-30 / Number real images: 2698 / Average exposure time: 1.8 sec. / Average electron dose: 63.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Movie frame data was subjected to motion correction to generate summed micrographs using MotionCor2.
Particle selection
Number selected: 1226339 Details: Approximately 20,000 particles were selected manually. 2D class averages from the manual-picked particles were used as a template for automated particle picking in Relion 2.1.
CTF correction
Software - Name: Gctf (ver. 1.06) Details: Defocus parameters were calculated from motion-corrected micrographs, using Gctf 1.06. Using the defocus parameters, Cs (0.003, after Cs image corrector tuning) and amplitude contrast (0.1), ...Details: Defocus parameters were calculated from motion-corrected micrographs, using Gctf 1.06. Using the defocus parameters, Cs (0.003, after Cs image corrector tuning) and amplitude contrast (0.1), CTF phase flipping and amplitude correction was performed during the reconstruction using Relion 2.1.
Details: PDB file was converted to EM map using e2pdb2mrc.py routine in EMAN2 software package. The reference map was lowpass filtered to 60 angstroms as a startup model.
Final reconstruction
Number classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.1) / Number images used: 252508
Initial angle assignment
Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.1)
Final angle assignment
Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.1)
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