ELECTRON MICROSCOPY

Sample

MYOSIN THICK FILAMENTS TARANTULA STRIATED MUSCLE

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument HOMEMADE PLUNGER
Cryogen Name ETHANE
Sample Vitrification Details PLUNGING IN A LIQUID ETHANE COOLED BY LIQUID NITROGEN. BLOTTING WAS PERFORMED FROM ONE SIDE OF THE GRID TILL A THIN SAMPLE FILM ON IT USING WHATMAN NO. 42 FILTER PAPER, THEN THE GRID WAS IMMEDIATELY PLUNGED UNDER GRAVITY INTO LIQUID ETHANE COOLED BY LIQUID NITROGEN. GRIDS WERE STORED UNDER LIQUID NITROGEN.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 10700
Reported Resolution (Å) 20
Resolution Method FSC 0.5 CUT-OFF
Other Details For projection matching, giving a total of 4,095 projections (13 tilted projections plus-minus 12 deg. every 2deg., 45 reference rotated projections (0-90 degrees, 2deg. rotation angle), and 7 image axial shifts of 2.2 nm. The resulting 3D-map combines about 10,700 out of 15,504 filament segments, a yield of 69 percent of included segments. There are 4 helices of myosin heads, rotated 30 degrees, every 145 Angstroms. The filament segments were selected based on visual judgement of good helical order.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target CORRELATION COEFFICIENT
Overall B Value ?
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 9
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI/PHILIPS CM120T
Minimum Defocus (nm) 1950
Maximum Defocus (nm) 1950
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.0
Imaging Mode BRIGHT FIELD
Specimen Holder Model GATAN LIQUID NITROGEN
Nominal Magnification 35000
Calibrated Magnification 35000
Source LAB6
Acceleration Voltage (kV) 120
Imaging Details Holey carbon grids Cryopreserved in Liquid ethane were observed in a Philips CM120 electron microscope under low dose conditions. Only filaments on thin carbon over holes were photographed
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION EMAN 2
MODEL FITTING UCSF Chimera 10
RECONSTRUCTION ITERATIVE HELICAL REAL SPACE RECONSTRUCTION (EGELMAN, 2000) SPIDER 14
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
NONE ?
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