ELECTRON MICROSCOPY

Sample

KIF1A HEAD DECORATED MICROTUBULE

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument ?
Cryogen Name ?
Sample Vitrification Details PLUNGED INTO ETHANE
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 37000
Reported Resolution (Å) 15
Resolution Method ?
Other Details THREE-DIMENSIONAL RECONSTRUCTION METHOD: FOURIER-BESSEL-TRANSFORM (DEROSIER AND MOORE, 1970 J.MOL.BIOL. 52, 355-369; BEROUKHIM AND UNWIN, 1997 ULTRAMICROSCOPY 70, 57-81). Software used: MRC PROGRAMS. EFFECTIVE RESOLUTION OF THE RECONSTRUCTION: THE RESOLUTION OF THE FINAL RECONSTRUCTED DENSITY WAS DETERMINED TO BE AT LEAST 15 ANGSTROMS, AS MEASURED BY RANDOMLY SPLITTING THE PARTICLES INTO TWO SETS AND CALCULATING THE FOURIER SHELL CORRELATIONS BETWEEN THE TWO INDEPENDENT SET. (HEEL, 1987, ULTRAMICROSCOPY 21, 95-100). 1IA0 is an atomic model of KIF1A head-microtubule complex, which contains KIF1A, alpha-tubulin, and beta-tubulin. Since alpha- and beta-tubulin were indistinguishable at 15A resolution, the assignment of alpha- and beta-tubulin was arbitrary when 1IA0 was deposited. Authors state that they were aware of the limitation and didn't mention about the assignment of alpha- and beta-tubulin in the relevant 2001 Nature paper. Therefore, the main conclusions in the paper are still hold true. However, subsequently the assignment of alpha- and beta-tubulin turned out to be wrong and should be swapped. For the correct assignment and better structures, please use 2HXF. This is based on higher resolution (10 ) structure, which was published in EMBO J. 2006. 25:4187-4194.
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target MAXIMUM CORRELATION
Overall B Value ?
Fitting Procedure ?
Details REFINEMENT PROTOCOL--RIGID BODY REFINEMENT
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 10
Imaging Experiment
Date of Experiment 1998-07-01
Temprature (Kelvin)
Microscope Model JEOL 2010F
Minimum Defocus (nm) 1700
Maximum Defocus (nm) 3000
Minimum Tilt Angle (degrees) 0
Maximum Tilt Angle (degrees) 2
Nominal CS 3.3
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification 40000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details