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 3C9K | pdb_00003c9k

Model of Histone Octamer Tubular Crystals


ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 2HIO 
Sample
Histone Octamer Tubular Crystal
Specimen Preparation
Sample Aggregation StateFILAMENT
Vitrification Instrument
Cryogen Name
Sample Vitrification DetailsNegative Stain 0.2% Uranyl Acetate
Staining TypeNEGATIVE
Staining MaterialUranyl Acetate
Staining Details
3D Reconstruction
Reconstruction MethodHELICAL
Number of Particles3500
Reported Resolution (Å)20
Resolution Method
Other Details11-fold rotational symmetry imposed during backprojection
Refinement Type
Symmetry TypeHELICAL
Map-Model Fitting and Refinement
Id1 (2HIO)
Refinement SpaceREAL
Refinement ProtocolRIGID BODY FIT
Refinement TargetCross-correlation and van der Waals energy
Overall B Value
Fitting Procedure
DetailsMETHOD--Because of the helical line group, the dyad axis is constrained to lie facing the helical axis and reduces the search to rotations and transl ...METHOD--Because of the helical line group, the dyad axis is constrained to lie facing the helical axis and reduces the search to rotations and translations about this dyad REFINEMENT PROTOCOL--Constrained Rigid Body
Data Acquisition
Detector TypeKODAK SO-163 FILM
Electron Dose (electrons/Å**2)100
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)295
Microscope ModelZEISS LEO912
Minimum Defocus (nm)1000
Maximum Defocus (nm)800
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging ModeBRIGHT FIELD
Specimen Holder Model
Nominal Magnification50000
Calibrated Magnification
SourceTUNGSTEN HAIRPIN
Acceleration Voltage (kV)120
Imaging Details
EM Software
TaskSoftware PackageVersion
RECONSTRUCTIONSPIDER