2P4N

Human Monomeric Kinesin (1BG2) and Bovine Tubulin (1JFF) Docked into the 9-Angstrom Cryo-EM Map of Nucleotide-Free Kinesin Complexed to the Microtubule


ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1JFF 
experimental modelPDB 1BG2 
Sample
Nucleotide-free kinesin bound to a 13-protofilament microtubule
Sample Components
Kinesin heavy chain
Tubulin alpha chain
Tubulin beta chain
Specimen Preparation
Sample Aggregation StateFILAMENT
Vitrification InstrumentHOMEMADE PLUNGER
Cryogen NameETHANE
Sample Vitrification DetailsETHANE
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles150000
Reported Resolution (Å)9
Resolution Method
Other DetailsSingle-particle analysis was employed.
Refinement Type
Symmetry TypeHELICAL
Map-Model Fitting and Refinement
Id1 (1JFF, 1BG2)
Refinement SpaceRECIPROCAL
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details
Data Acquisition
Detector TypeKODAK SO-163 FILM
Electron Dose (electrons/Å**2)16
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)103.15
Microscope ModelJEOL 4000
Minimum Defocus (nm)700
Maximum Defocus (nm)1500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS4.1
Imaging ModeBRIGHT FIELD
Specimen Holder Model
Nominal Magnification60000
Calibrated Magnification
SourceLAB6
Acceleration Voltage (kV)400
Imaging Details
EM Software
TaskSoftware PackageVersion
MODEL FITTINGSitus
RECONSTRUCTIONSPIDER
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
CTF correction was integrated into the back projection process with a customized C program