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Atomic model of the Ocr-bound methylase complex from the Type I restriction-modification enzyme EcoKI (M2S1). Based on fitting into EM map 1534.
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 1S7Z experimental model PDB 1YF2 experimental model PDB 2AR0
Specimen Preparation Sample Aggregation State PARTICLE Staining Type NEGATIVE Staining Material Uranyl Acetate Staining Details
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 17807 Reported Resolution (Å) 18 Resolution Method Other Details HSDM N-TERMINAL DOMAIN RETRACED FROM PDB ENTRY 2AR0. DISORDERED C-TERMINUS OF HSDM MODELLED INTO DENSITY. Refinement Type Symmetry Type POINT Point Symmetry C2
Map-Model Fitting and Refinement Id 1 (1S7Z, 1YF2, 2AR0) Refinement Space REAL Refinement Protocol RIGID BODY FIT Refinement Target Overall B Value Fitting Procedure Details METHOD--UROX REFINEMENT PROTOCOL--RIGID BODY
Data Acquisition Detector Type KODAK SO-163 FILM Electron Dose (electrons/Å**2) 25
Imaging Experiment 1 Date of Experiment 2008-02-01 Temperature (Kelvin) 294 Microscope Model JEOL 1200EX Minimum Defocus (nm) 275 Maximum Defocus (nm) 870 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 2 Imaging Mode BRIGHT FIELD Specimen Holder Model Nominal Magnification 40000 Calibrated Magnification 39500 Source TUNGSTEN HAIRPIN Acceleration Voltage (kV) 80 Imaging Details
EM Software Task Software Package Version MODEL FITTING Situs MODEL FITTING UCSF Chimera MODEL FITTING URO RECONSTRUCTION EMAN RECONSTRUCTION IMAGIC RECONSTRUCTION MRC IMAGE PROCESSING PACKAGE
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details FILTERED AT FIRST ZERO