2W4U | pdb_00002w4u

Isometrically contracting insect asynchronous flight muscle quick frozen after a length step

ELECTRON MICROSCOPY

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Sample
INSECT FIBRILLAR FLIGHT MUSCLE

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	HOMEMADE PLUNGER
Cryogen Name	HELIUM
Sample Vitrification Details	SMASH AGAINST A LIQUID HELIUM COOLED GOLD COATED COPPER MIRROR

3D Reconstruction
Reconstruction Method	HELICAL
Number of Particles
Reported Resolution (Å)
Resolution Method	FSC 0.5 CUT-OFF
Other Details	NOTE THAT OUR LOWEST RESOLUTION DATA IS AT INVERSE 1 MICRON. NUMBER OF FOURIER COEFFICIENTS IS ALMOST A HALF MILLION. THESE COORDINATES WERE FIT TO AVERAGED SUBVOLUMES OBTAINED FROM A DUAL AXIS TOMOGRAM. THE ACTIN FILAMENT WAS GENERATED TO HAVE THE HELICAL SYMMETRY OF 28 SUBUNITS IN 13 TURNS OF THE 5.9 NM HELIX. THE FITTING WAS DONE MANUALLY USING THE CRYSTALLOGRAPHIC MODEL FITTING PROGRAM O.
Refinement Type
Symmetry Type	HELICAL

Data Acquisition
Detector Type	TVIPS TEMCAM-F224 (2k x 2k)
Electron Dose (electrons/Å**2)

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI/PHILIPS CM300FEG/T
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)	-72
Maximum Tilt Angle (degrees)	72
Nominal CS	2
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	NONE