ELECTRON MICROSCOPY

Sample

Bacteriophage T4 tail

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument HOMEMADE PLUNGER
Cryogen Name ETHANE
Sample Vitrification Details plunged into liquid ethane (homemade plunger)
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 2727
Reported Resolution (Å) 25
Resolution Method FSC 0.5 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol ?
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details DETAILS--The model of fibritin comprises the crystal structure of the N-terminal domain (Boudko et al., 2004, J. Mol. Biol. 339, 927-935), the crystal structure of the C-terminal domain (Tao et al., 1997, Structure 5, 789-798), and the central region, modeled with segments of triple-helical coiled coil (Letarov et al., 2005, J. Bacteriol. 187, 1055-1066). These parts of the fibritin structure were fitted into the cryo-EM density using the program CHIMERA (Pettersen et al., 2004, J. Computat. Chem. 25, 1605-1612). Chains A, B, and C correspond to one fibritin molecule located in the phage collar. Chains D, E, and F correspond to one fibritin molecule forming the whisker.
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 16
Imaging Experiment
Date of Experiment 2007-03-07
Temprature (Kelvin)
Microscope Model FEI/PHILIPS CM200FEG
Minimum Defocus (nm) 1500
Maximum Defocus (nm) 3000
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2
Imaging Mode BRIGHT FIELD
Specimen Holder Model GATAN LIQUID NITROGEN
Nominal Magnification 38000
Calibrated Magnification 39190
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details ?
Imaging Experiment
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
. phase flipping