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 8G3H | pdb_00008g3h

Structure of cobalamin-dependent methionine synthase (MetH) in a resting state


ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
in silico modelAlphaFoldA0A1Q9SZ17 
Sample
Cobalamin-dependent methionine synthase holoprotein
Specimen Preparation
Sample Aggregation State2D ARRAY
Vitrification InstrumentFEI VITROBOT MARK IV
Cryogen NameETHANE-PROPANE
Sample Vitrification Details
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles257706
Reported Resolution (Å)3.6
Resolution MethodFSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry TypePOINT
Map-Model Fitting and Refinement
Id1
Refinement SpaceREAL
Refinement ProtocolRIGID BODY FIT
Refinement Target
Overall B Value
Fitting Procedure
DetailsInitial model used was the 3 N-terminal domains of AlphaFold database model A0A1Q9SZ17. Each domain was fit individually by rigid-body fitting in Chim ...Initial model used was the 3 N-terminal domains of AlphaFold database model A0A1Q9SZ17. Each domain was fit individually by rigid-body fitting in Chimera. The cobalamin ligand was initially fit by alignment of the 1BMT crystal structure to the appropriate binding region.
Data Acquisition
Detector TypeGATAN K3 (6k x 4k)
Electron Dose (electrons/Å**2)65
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)
Microscope ModelFEI TITAN KRIOS
Minimum Defocus (nm)800
Maximum Defocus (nm)2500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS2.7
Imaging ModeBRIGHT FIELD
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification81000
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)300
Imaging Details
EM Software
TaskSoftware PackageVersion
PARTICLE SELECTIONcryoSPARC3.2
IMAGE ACQUISITIONLeginon
CTF CORRECTIONcryoSPARC3.2
MODEL FITTINGUCSF Chimera1.15
INITIAL EULER ASSIGNMENTcryoSPARC3.2
FINAL EULER ASSIGNMENTcryoSPARC3.2
CLASSIFICATIONcryoSPARC3.2
RECONSTRUCTIONcryoSPARC3.2
MODEL REFINEMENTISOLDE1.3
MODEL REFINEMENTPHENIX1.20.1-4487
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTIONcryoSPARC patch CTF9994870