4CY4 | pdb_00004cy4

The Cryo-Electron Microscopy Structure of the CorA channel from Methanocaldococcus jannaschii at 21.6 Angstrom in low magnesium.

ELECTRON MICROSCOPY

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	4EV6

Sample
CORA CHANNEL FROM METHANOCALDOCOCCUS JANNASCHII

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

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	44064
Reported Resolution (Å)	21.6
Resolution Method
Other Details	THE HIGH-RES MJCORA PDB 4EV6 STRUCTURE WAS DOCKED AS AN UNMODIFIED RIGID BODY. THERE ARE DIFFERENCES IN THE CRYO- EM AND CRYSTAL STRUCTURE DUE TO DIFFERENCES IN SOLUTION CONDITIONS SPECIFICALLY MG ION CONCENTRATION. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2626. (DEPOSITION ID: 12440).
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (4EV6)
Refinement Space	REAL
Refinement Protocol	RIGID BODY FIT
Refinement Target	Cross-correlation coefficient
Overall B Value
Fitting Procedure
Details	METHOD--RIGID BODY REFINEMENT PROTOCOL--DOCKING OF X-RAY CRYSTAL STRUCTURE

Data Acquisition
Detector Type	GATAN ULTRASCAN 4000 (4k x 4k)
Electron Dose (electrons/Å**2)

Imaging Experiment	1
Date of Experiment	2009-06-05
Temperature (Kelvin)	100
Microscope Model	FEI TECNAI F20
Minimum Defocus (nm)	3300
Maximum Defocus (nm)	4800
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details	LOW DOSE MODE

EM Software
Task	Software Package	Version
MODEL FITTING	UCSF Chimera
RECONSTRUCTION	EMAN

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	WITH REFERENCE TO X-RAY SCATTERING CURVE