3EFX
Novel binding site identified in a hybrid between cholera toxin and heat-labile enterotoxin, 1.9A crystal structure reveals the details
X-RAY DIFFRACTION
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | VAPOR DIFFUSION, HANGING DROP | 7.5 | 298 | 23-24% PEG 3350, 0.25-0.3M CALCIUM CHLORIDE, 20% GLYCEROL, pH 7.50, VAPOR DIFFUSION, HANGING DROP, temperature 298K |
Crystal Properties | |
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Matthews coefficient | Solvent content |
2.28 | 46.13 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 110.2 | α = 90 |
b = 70.1 | β = 92.9 |
c = 137.4 | γ = 90 |
Symmetry | |
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Space Group | C 1 2 1 |
Diffraction
Diffraction Experiment | ||||||||||||||
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ID # | Crystal ID | Scattering Type | Data Collection Temperature | Detector | Detector Type | Details | Collection Date | Monochromator | Protocol | |||||
1 | 1 | x-ray | 100 | CCD | MAR CCD 165 mm | M | SINGLE WAVELENGTH | |||||||
2 | 1 | x-ray | 100 | IMAGE PLATE | MAR scanner 345 mm plate | M | SINGLE WAVELENGTH |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | SYNCHROTRON | MAX II BEAMLINE I711 | 0.97 | MAX II | I711 |
2 | ROTATING ANODE | RIGAKU RU300 | 1.5418 |
Data Collection
Overall | |||||||||||||||||||
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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 | 1.94 | 19.44 | 96 | 0.056 | 19.6 | 5.4 | 77618 | 74812 | -3.2 | -3.2 |
Highest Resolution Shell | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | ||||||||||||
1,2 | 1.94 | 1.99 | 92.94 |
Refinement
Statistics | |||||||||||||||||||
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Diffraction ID | Structure Solution Method | Cross Validation method | Starting model | Resolution (High) | Resolution (Low) | Number Reflections (All) | Number Reflections (Observed) | Number Reflections (R-Free) | Percent Reflections (Observed) | R-Factor (All) | R-Factor (Observed) | R-Work | R-Free | R-Free Selection Details | Mean Isotropic B | ||||
X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | THROUGHOUT | PDB ENTRY 1EEI | 1.94 | 19.44 | 71039 | 71039 | 3773 | 0.18359 | 0.18359 | 0.181 | 0.23179 | RANDOM | 23.064 |
Temperature Factor Modeling | ||||||
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Anisotropic B[1][1] | Anisotropic B[1][2] | Anisotropic B[1][3] | Anisotropic B[2][2] | Anisotropic B[2][3] | Anisotropic B[3][3] | |
-0.15 | -2.11 | -0.24 | 0.18 |
RMS Deviations | |
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Key | Refinement Restraint Deviation |
r_dihedral_angle_2_deg | 37.29 |
r_dihedral_angle_4_deg | 22.663 |
r_dihedral_angle_3_deg | 13.351 |
r_dihedral_angle_1_deg | 6.735 |
r_scangle_it | 2.772 |
r_scbond_it | 1.811 |
r_angle_refined_deg | 1.387 |
r_mcangle_it | 1.244 |
r_mcbond_it | 0.805 |
r_nbtor_refined | 0.307 |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | 7402 |
Nucleic Acid Atoms | |
Solvent Atoms | 888 |
Heterogen Atoms | 570 |
Software
Software | |
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Software Name | Purpose |
MAR345dtb | data collection |
AMoRE | phasing |
REFMAC | refinement |
XDS | data reduction |
XSCALE | data scaling |