ELECTRON MICROSCOPY

Sample

Aquaporin-0 bound to Calmodulin

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument
Cryogen Name
Sample Vitrification Details
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 11720
Reported Resolution (Å) 25
Resolution Method FSC 0.5 CUT-OFF
Other Details Final Map with C2 Symmetry and Filtered to 25 Angstrom (Single particle details: Particles were selected from a tilted pair dataset at 0 and 50 degree tilt using SPIDER. An initial reconstruction was generated using random conical tilt methods in SPIDER and refined in FREALIGN.) (Single particle--Applied symmetry: C2)
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target cross-correlation
Overall B Value ?
Fitting Procedure ?
Details REFINEMENT PROTOCOL--rigid body DETAILS--A complete model of AQP0-CaM was built by fitting 2B6P and 1NWD into the EM map in Chimera. Loops connecting the two structures were built using COOT and the final model was energy minimized to remove steric clashes. The geometries of the modeled loops (AQP0 residues 222-227) were not refined due to lack of resolution in the experimental map.
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 15
Imaging Experiment
Date of Experiment 2010-02-25
Temprature (Kelvin)
Microscope Model FEI TECNAI 12
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 2000
Minimum Tilt Angle (degrees) 0
Maximum Tilt Angle (degrees) 50
Nominal CS 2
Imaging Mode BRIGHT FIELD
Specimen Holder Model OTHER
Nominal Magnification 52000
Calibrated Magnification 52000
Source LAB6
Acceleration Voltage (kV) 120
Imaging Details ?
Imaging Experiment
Task Software Package Version
MODEL FITTING UCSF Chimera ?
RECONSTRUCTION FREALIGN ?
RECONSTRUCTION SPIDER ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
. CTF-TILT, each micrograph