1M0F

Structural Studies of Bacteriophage alpha3 Assembly, Cryo-electron microscopy

ELECTRON MICROSCOPY

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Sample
Procapsid of the bacteriophage alpha3

Specimen Preparation
Sample Aggregation State	PARTICLE

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	2378
Reported Resolution (Å)	16
Resolution Method
Other Details	2378 particles were included in the final reconstruction. The effective resolution is 15.0-16.0A. Higher resolution was not possible because of the tendency of particles to orient themselves non-randomly. Only CA coordinates are presented in the entry.
Refinement Type
Symmetry Type	POINT
Point Symmetry	I

Map-Model Fitting and Refinement
Id	1 (1M06, 1CD3)
Refinement Space	REAL
Refinement Protocol	RIGID BODY FIT
Refinement Target	Best fit criterion used by the program EMfit is based on the average value of the density at all atomic sites in the fitted protein, the lack of atoms in negative density, and the absence of symmetry related atomic clashes.
Overall B Value
Fitting Procedure
Details	METHOD--General search followed by a climb procedure REFINEMENT PROTOCOL--rigid molecule fit using the program EMfit

Data Acquisition
Detector Type	KODAK SO-163 FILM
Electron Dose (electrons/Å**2)	0.017

Imaging Experiment	1
Date of Experiment	1998-10-16
Temperature (Kelvin)	88
Microscope Model	FEI/PHILIPS CM200FEG/ST
Minimum Defocus (nm)	3200
Maximum Defocus (nm)	1600
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification	38000
Calibrated Magnification	40000
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
MODEL FITTING	EMfit
PARTICLE SELECTION	RobEM
RECONSTRUCTION	EM3DR

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	CTF correction was done for each particle.