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Model for the structure of Bacteriorhodopsin based on high-resolution Electron Cryo-microscopy
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 62.45 α = 90 b = 62.45 β = 90 c = 100 γ = 120
Diffraction Diffraction Experiment ID # Crystal ID Scattering Type Data Collection Temperature Detector Detector Type Details Collection Date Monochromator Protocol 1 1 electron
Refinement Statistics Diffraction ID Structure Solution Method Resolution (High) Resolution (Low) Number Reflections (R-Free) Percent Reflections (Observed) R-Work (Depositor) R-Work (DCC) R-Free (Depositor) Mean Isotropic B ELECTRON CRYSTALLOGRAPHY 3.5 0.3869
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]
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 1343 Nucleic Acid Atoms Solvent Atoms Heterogen Atoms 20
Sample Bacteriorhodopsin from purple membrane
Specimen Preparation Sample Aggregation State 2D ARRAY Embedding Material glucose Embedding Details 0.8% (w/v) glucose
3D Reconstruction Reconstruction Method CRYSTALLOGRAPHY Number of Particles Reported Resolution (Å) 3.5 Resolution Method DIFFRACTION PATTERN/LAYERLINES Other Details Refinement Type Symmetry Type 2D CRYSTAL Space Group Name P 3 Length a 62.45 Length b 62.45 Angle Gamma 120
Data Acquisition Detector Type GENERIC FILM GENERIC FILM GENERIC FILM Electron Dose (electrons/Å**2) 20 15
Imaging Experiment 1 2 3 Date of Experiment Temperature (Kelvin) Microscope Model FEI/PHILIPS EM420 SIEMENS SULEIKA JEOL 100B Minimum Defocus (nm) Maximum Defocus (nm) Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS Imaging Mode DIFFRACTION BRIGHT FIELD BRIGHT FIELD Specimen Holder Model Nominal Magnification 66000 55000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 120 100 100 Imaging Details 60 degree tilted specimens 0, 20, 45 degree + random degree tilts , 20, 45 degree + random degree tilts