8Q6I | pdb_00008q6i

Cholera holotoxin variant (chimera with E. coli heat-labile enterotoxin, 1 C-terminal substitution)


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 8QREstripped 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 DROP8293.15Crystallization mix: 20% PEG6000 0.2 M lithium chloride 0.1 M Tris pH 8.0 Protein storage buffer: 0.05 M Tris/HCl pH 7.5 0.2 M NaCl
Crystal Properties
Matthews coefficientSolvent content
2.2545.35

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 60.308α = 90
b = 91.091β = 106.403
c = 72.291γ = 90
Symmetry
Space GroupP 1 21 1

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100PIXELDECTRIS EIGER X 9M2022-06-25MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONESRF BEAMLINE ID30B0.87313ESRFID30B

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
11.648.8496.710.0850.0920.0340.99910.87.19550729.3
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)
11.61.6692.12.8083.0221.1080.4360.77.4

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-Work (Depositor)R-Work (DCC)R-Free (Depositor)R-Free (DCC)Mean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTFREE R-VALUE1.60348.8494960460796.7090.1870.1850.19420.22150.229728.494
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]
-0.734-0.7932.226-0.874
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_6_deg14.691
r_dihedral_angle_3_deg12.53
r_dihedral_angle_1_deg7.248
r_lrange_it5.87
r_lrange_other5.87
r_scangle_it4.399
r_scangle_other4.399
r_mcangle_other3.513
r_mcangle_it3.507
r_scbond_it2.943
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_6_deg14.691
r_dihedral_angle_3_deg12.53
r_dihedral_angle_1_deg7.248
r_lrange_it5.87
r_lrange_other5.87
r_scangle_it4.399
r_scangle_other4.399
r_mcangle_other3.513
r_mcangle_it3.507
r_scbond_it2.943
r_scbond_other2.942
r_dihedral_angle_2_deg2.811
r_mcbond_it2.471
r_mcbond_other2.462
r_angle_refined_deg1.487
r_angle_other_deg0.524
r_nbd_refined0.218
r_xyhbond_nbd_refined0.214
r_symmetry_nbd_other0.193
r_nbd_other0.18
r_nbtor_refined0.175
r_symmetry_nbd_refined0.134
r_ncsr_local_group_40.095
r_ncsr_local_group_10.094
r_ncsr_local_group_30.089
r_metal_ion_refined0.087
r_ncsr_local_group_20.087
r_symmetry_xyhbond_nbd_refined0.085
r_chiral_restr0.078
r_symmetry_nbtor_other0.078
r_ncsr_local_group_80.074
r_symmetry_xyhbond_nbd_other0.073
r_ncsr_local_group_100.07
r_ncsr_local_group_90.067
r_ncsr_local_group_50.066
r_ncsr_local_group_60.061
r_ncsr_local_group_70.055
r_bond_refined_d0.007
r_gen_planes_refined0.007
r_gen_planes_other0.002
r_bond_other_d0.001
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms5885
Nucleic Acid Atoms
Solvent Atoms408
Heterogen Atoms82

Software

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