3J3U | pdb_00003j3u

Structural dynamics of the MecA-ClpC complex revealed by cryo-EM

ELECTRON MICROSCOPY

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3PXI

Sample
MecA-ClpC (E280A,E618A) with ATP

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	36688
Reported Resolution (Å)	10
Resolution Method	FSC 0.5 CUT-OFF
Other Details	(Single particle--Applied symmetry: C6)
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (3PXI)
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target	Cross-correlation
Overall B Value
Fitting Procedure
Details	REFINEMENT PROTOCOL--flexible DETAILS--Protocol- Initial local fitting was done using Chimera and then MDFF was used for flexible fitting. ref- Trabuco, L.G., Villa, E., Mitra, K., Frank, J. and Schulten, K. (2008) Flexible fitting of atomic structures into electron microscopy maps using molecular dynamics. Structure, 16, 673-683

Data Acquisition
Detector Type	FEI EAGLE (4k x 4k)
Electron Dose (electrons/Å**2)	20

Imaging Experiment	1
Date of Experiment	2010-09-09
Temperature (Kelvin)	90
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	1700
Maximum Defocus (nm)	4000
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification	59000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
MODEL FITTING	MDFF
RECONSTRUCTION	SPIDER

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	each defocus group on 3D level