7CGY | pdb_00007cgy

Human DMC1 Q244M mutant of the post-synaptic complexes

ELECTRON MICROSCOPY

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Sample
DMC1Q244M-dsDNA filament
Sample Components
DMC1 Q244M mutant
homologous double strand DNA

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	The grids were blotted for 1 sec at 22 degree C with 100% relative humidity and plunge-frozen in liquid ethane cooled by liquid nitrogen using a Vitrobot Mark IV (Thermo Fisher).

3D Reconstruction
Reconstruction Method	HELICAL
Number of Particles	232018
Reported Resolution (Å)	3.2
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	HELICAL
Axial Symmetry	C1
Axial Rise	16
Angular Rotation	55.93

Map-Model Fitting and Refinement
Id	1
Refinement Space
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K2 QUANTUM (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)
Maximum Defocus (nm)
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	165000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	RELION	3.0
IMAGE ACQUISITION	EPU	2.2.0
CTF CORRECTION	RELION	3.0
MODEL FITTING	PHENIX	1.14
MODEL REFINEMENT	Coot	0.8.9.2
MODEL REFINEMENT	Rosetta	3.9
RECONSTRUCTION	RELION	3.0

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		643100	Filaments were manually picked, and segments were extracted using a box size of 384 pixel and an inter-box distance of ~10% of the box length.