1FBB

CRYSTAL STRUCTURE OF NATIVE CONFORMATION OF BACTERIORHODOPSIN

ELECTRON CRYSTALLOGRAPHY

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	naturally occurring in vivo	7	310	crystal size is increased by fusion and annealing using detergents, pH 7, naturally occurring in vivo, temperature 37K

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 62.45	α = 90
b = 62.45	β = 90
c = 100.9	γ = 120

Symmetry
Space Group	P 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	electron	93	FILM	OTHER		1986-01-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ELECTRON MICROSCOPE	OTHER

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	3.2	200	65.1	0.173			7297	4749

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work (Depositor)	R-Free (Depositor)	R-Free Selection Details	Mean Isotropic B
ELECTRON CRYSTALLOGRAPHY		3.2	200	7297	4749	514	65.1	0.239	0.31	RANDOM

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
Key	Refinement Restraint Deviation
c_angle_deg	1.4
c_bond_d	0.009

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1733
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	20

Software

Software
Software Name	Purpose
CNS	refinement

Sample
Bacteriorhodopsin

Specimen Preparation
Sample Aggregation State	2D ARRAY

3D Reconstruction
Reconstruction Method	CRYSTALLOGRAPHY

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

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.