6PKK

MicroED structure of proteinase K from an uncoated, single lamella at 2.18A resolution (#5)


ELECTRON CRYSTALLOGRAPHY

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 6CL7 

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 67.57α = 90
b = 67.57β = 90
c = 105.72γ = 90
Symmetry
Space GroupP 43 21 2

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodResolution (High)Resolution (Low)Cut-off Sigma (F)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (Observed)R-WorkR-FreeR-Free Selection DetailsMean Isotropic B
ELECTRON CRYSTALLOGRAPHYTHROUGHOUT2.17641.6341.3313203147794.460.22580.22310.2649copied from 6cl7
Temperature Factor Modeling
Anisotropic B[1][1]Anisotropic B[1][2]Anisotropic B[1][3]Anisotropic B[2][2]Anisotropic B[2][3]Anisotropic B[3][3]
RMS Deviations
KeyRefinement Restraint Deviation
f_dihedral_angle_d2.682
f_angle_d0.583
f_chiral_restr0.04
f_bond_d0.004
f_plane_restr0.004

Software

Software
Software NamePurpose
PHENIXrefinement
Sample
Proteinase K
Specimen Preparation
Sample Aggregation State3D ARRAY
Vitrification InstrumentFEI VITROBOT MARK IV
Cryogen NameETHANE
Sample Vitrification Details
3D Reconstruction
Reconstruction MethodCRYSTALLOGRAPHY
Number of Particles
Reported Resolution (Å)2.176
Resolution MethodDIFFRACTION PATTERN/LAYERLINES
Other Details
Refinement Type
Symmetry Type3D CRYSTAL
Space Group Name
Length a67.6
Length b67.6
Length c67.6
Angle Alpha90
Angle Beta90
Angle Gamma90
Map-Model Fitting and Refinement
Id1 (6CL7)
Refinement SpaceRECIPROCAL
Refinement ProtocolRIGID BODY FIT
Refinement Target
Overall B Value31.74
Fitting Procedure
Details
Data Acquisition
Detector TypeFEI CETA (4k x 4k)
Electron Dose (electrons/Å**2)0.03
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)
Microscope ModelFEI TALOS ARCTICA
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging ModeDIFFRACTION
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)200
Imaging Details
EM Software
TaskSoftware PackageVersion
MODEL FITTINGPHENIX1.15
MOLECULAR REPLACEMENTPHENIX2.8.2
RECONSTRUCTIONPHENIX1.15.2
MODEL REFINEMENTPHENIX1.15
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
NONENONE