3J68

ELECTRON MICROSCOPY

Sample

active sea urchin sperm flagella

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument HOMEMADE PLUNGER
Cryogen Name ETHANE
Sample Vitrification Details Blot for 1.5-2.5 seconds before plunging in liquid ethane.
3D Reconstruction
Reconstruction Method TOMOGRAPHY
Number of Particles ?
Reported Resolution (Å) 30
Resolution Method FSC 0.5 CUT-OFF
Other Details Final maps were calculated by averaging 2800 particles from 41 tomograms. Axonemal repeats (96 nm long) from 41 tomograms (reconstructed using fiducial alignment and weighted backprojection, IMOD software, Kremer et al. 1996) were aligned and averaged using the PEET software (bio3d.colorado.edu, Nicastro et al. 2006). To obtain structures with consistent conformations, classification of the different conformational states of dynein was performed using a clustering approach implemented in PEET (Heumann et al. 2011).
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space ?
Refinement Protocol RIGID BODY FIT
Refinement Target Cross-correlation coefficient
Overall B Value ?
Fitting Procedure ?
Details REFINEMENT PROTOCOL--rigid body DETAILS--Initial local fitting was done using Chimera and then manual adjustment was performed.
Data Acquisition
Detector Type GENERIC GATAN (2k x 2k)
Electron Dose (electrons/Å2) 100
Imaging Experiment
Date of Experiment 2012-04-07
Temprature (Kelvin)
Microscope Model FEI TECNAI F30
Minimum Defocus (nm) 6000
Maximum Defocus (nm) 8000
Minimum Tilt Angle (degrees) -65
Maximum Tilt Angle (degrees) 65
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model GATAN LIQUID NITROGEN
Nominal Magnification 13500
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
RECONSTRUCTION IMOD ?
RECONSTRUCTION PEET ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details