8OXS

Cholera holotoxin variant (chimera with E. coli heat-labile enterotoxin, 4 C-terminal substitutions)


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1S5Estripped of solvent and ligand molecules, used one copy of the holotoxin (1 A subunit, 5 B subunits) as the search model

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, SITTING DROP7293.15Crystallization mix: 20% w/v PEG 6K 0.1 M HEPES pH 7.0 0.2 M NH4Cl Protein storage buffer: 0.05 M Tris/HCl pH 7.5 0.2 M NaCl 0.05 M D-(+)-galactose
Crystal Properties
Matthews coefficientSolvent content
2.2445.2

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 60.295α = 90
b = 89.61β = 98.186
c = 141.094γ = 90
Symmetry
Space GroupP 1 21 1

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100PIXELDECTRIS PILATUS 2M-F2022-09-15MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONESRF BEAMLINE ID23-20.87313ESRFID23-2

Data Collection

Overall
ID #Resolution (High)Resolution (Low)Percent Possible (Observed)R Merge I (Observed)Rrim I (All)Rpim I (All)CC (Half)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
11.648.999.90.180.1960.0760.9956.66.719562521.6
Highest Resolution Shell
ID #Resolution (High)Resolution (Low)Percent Possible (All)Percent Possible (Observed)R Merge I (Observed)Rrim I (All)Rpim I (All)CC (Half)Mean I Over Sigma (Observed)RedundancyNumber Unique Reflections (All)
11.61.6399.71110.9970.66.1

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodResolution (High)Resolution (Low)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (All)R-WorkR-FreeMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTFREE R-VALUE1.648.9195625205599.7810.1940.19320.223923.729
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]
-0.7140.0192.141-1.376
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_6_deg15.6
r_dihedral_angle_3_deg14.264
r_dihedral_angle_2_deg8.16
r_dihedral_angle_1_deg7.1
r_lrange_it4.914
r_lrange_other4.914
r_scangle_it3.35
r_scangle_other3.35
r_mcangle_it2.424
r_mcangle_other2.424
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_6_deg15.6
r_dihedral_angle_3_deg14.264
r_dihedral_angle_2_deg8.16
r_dihedral_angle_1_deg7.1
r_lrange_it4.914
r_lrange_other4.914
r_scangle_it3.35
r_scangle_other3.35
r_mcangle_it2.424
r_mcangle_other2.424
r_scbond_it2.094
r_scbond_other2.094
r_mcbond_it1.555
r_mcbond_other1.555
r_angle_refined_deg1.445
r_angle_other_deg0.489
r_nbd_refined0.211
r_symmetry_nbd_other0.186
r_nbd_other0.183
r_nbtor_refined0.173
r_symmetry_nbd_refined0.163
r_symmetry_xyhbond_nbd_refined0.157
r_xyhbond_nbd_refined0.151
r_metal_ion_refined0.121
r_symmetry_nbtor_other0.076
r_chiral_restr0.069
r_symmetry_xyhbond_nbd_other0.029
r_bond_refined_d0.008
r_gen_planes_refined0.008
r_bond_other_d0.001
r_gen_planes_other0.001
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms11848
Nucleic Acid Atoms
Solvent Atoms764
Heterogen Atoms266

Software

Software
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing
Cootmodel building
MxCuBEdata collection