2BRD

CRYSTAL STRUCTURE OF BACTERIORHODOPSIN IN PURPLE MEMBRANE

ELECTRON CRYSTALLOGRAPHY

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Crystallization

Crystal Properties
Matthews coefficient	Solvent content
4.24	70.97

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		FILM			1986-01-01	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1

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	2.8	54	62.3	0.15		18		6750

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic B
ELECTRON CRYSTALLOGRAPHY		3.5	30	4743		85.4	0.28		114

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
p_transverse_tor	36.1
p_staggered_tor	20.4
p_planar_tor	0.865
p_multtor_nbd	0.242
p_singtor_nbd	0.185
p_xyhbond_nbd	0.127
p_chiral_restr	0.086
p_planar_d	0.022
p_angle_d	0.02
p_bond_d	0.005
p_plane_restr	0.005
p_angle_deg
p_hb_or_metal_coord
p_mcbond_it
p_mcangle_it
p_scbond_it
p_scangle_it
p_xhyhbond_nbd
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1718
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	610

Software

Software
Software Name	Purpose
PROLSQ	refinement
PICKYCOR	data reduction
AN	data reduction

Sample
BACTERIORHODOPSIN CRYSTAL

Specimen Preparation
Sample Aggregation State	2D ARRAY

3D Reconstruction
Reconstruction Method	CRYSTALLOGRAPHY
Number of Particles
Reported Resolution (Å)
Resolution Method
Other Details
Refinement Type
Symmetry Type	2D CRYSTAL

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