1QM8

Structure of Bacteriorhodopsin at 100 K


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1BM1PDB ENTRY 1BM1

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION5.2THE CRYSTALLIZATION CONSISTS OF TWO STEPS. FIRST, A MIXTURE OF 5 MG/ML PURPLE MEMBRANE, 0.25% OTG, 1 M AMMONIUM SULFATE, 0.16 M NACL, 0.04 M SODIUM CITRATE (PH5.2) , 0.04% NAN3 WAS INCUBATED AND 15% TREHALOSE AT 305K FOR 5 DAYS. THIS RESULTED IN THE FORMATION OF SPHERICAL VESICLES WITH A DIAMETER OF 50 NM. AFTER SEDIMENTAL MATERIALS WERE REMOVED BY CENTRIFUGATION (4000G X 10 MIN), A SUSPENSION OF THE SPHERICAL VESICLES WAS COOLED TO 278K AND CONCENTRATED BY VAPOR DIFFUSION AGAINST A RESERVOIR SOLUTION CONTAINING 2.0 M AMMONIUM SULFATE 0.08M SODIUM CITRATE (PH 5.2) AND 30% TREHALOSE. INCUBATION FOR A COUPLE OF MONTHS YIELDED HEXAGONAL CRYSTALS.
Crystal Properties
Matthews coefficientSolvent content
3.1560.96

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 102.1α = 90
b = 102.1β = 90
c = 112.3γ = 120
Symmetry
Space GroupP 6 2 2

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100IMAGE PLATEFUJI FILMMIRRORS1998-05-18MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONSPRING-8 BEAMLINE BL44B2SPring-8BL44B2

Data Collection

Overall
ID #Resolution (High)Resolution (Low)Percent Possible (Observed)R Sym I (Observed)Net I Over Average Sigma (I)RedundancyNumber Reflections (All)Number Reflections (Observed)Observed Criterion Sigma (F)Observed Criterion Sigma (I)B (Isotropic) From Wilson Plot
12.546.61000.0579.91250049.2
Highest Resolution Shell
ID #Resolution (High)Resolution (Low)Percent Possible (All)Percent Possible (Observed)R-Sym I (Observed)Mean I Over Sigma (Observed)RedundancyNumber Unique Reflections (All)
12.52.6599.90.3879.9

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodStarting modelResolution (High)Resolution (Low)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (Observed)R-WorkR-FreeR-Free Selection DetailsMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTTHROUGHOUTPDB ENTRY 1BM12.58118886101000.2510.2510.278RANDOM
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]
-28.5-14.2-28.54.9
RMS Deviations
KeyRefinement Restraint Deviation
x_dihedral_angle_d20.636
x_angle_deg1.419
x_improper_angle_d1.206
x_bond_d0.01
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
RMS Deviations
KeyRefinement Restraint Deviation
x_dihedral_angle_d20.636
x_angle_deg1.419
x_improper_angle_d1.206
x_bond_d0.01
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms1759
Nucleic Acid Atoms
Solvent Atoms23
Heterogen Atoms257

Software

Software
Software NamePurpose
X-PLORrefinement
MOSFLMdata reduction
SCALAdata scaling
X-PLORphasing