7ULU
Human DDAH1 soaked with its inhibitor ClPyrAA
X-RAY DIFFRACTION
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | VAPOR DIFFUSION, SITTING DROP | 293 | Purified DDAH1 was concentrated to approximately 10 mg/mL using an Amicon-Ultra centrifugal filter device (10 kDa MWCO). The protein was crystallized at 25 C using the hanging drop method (Hampton Research, Aliso Viejo, CA) from 25 % (w/v) PEG6000, 0.1 M Tris-HCl, pH 8.2. Further optimization was done manually using a 1:1 well solution: DDAH1 stock solution ratio to improve crystal size and morphology. Crystals grew to their maximum size in 3 weeks and were harvested after approximately 25 days. To determine the structure of DDAH1 in complex with ligand, the crystals were transferred to a reservoir containing 20 uL of 20 mM of ligand in the crystallization mother liquor (25% PEG 6000, 0.1 M Tris-HCl, pH 8.2) and soaked for 30 min. Before data collection, crystals with good size and morphology were transferred into a cryoprotection solution (Well Solution supplemented with 25 % (v/v) glycerol) for 1 to 5 seconds using a the cryoloop (Hampton Research, Laguna Niguel, CA). Individual hDDAH1:ligand crystals were flash frozen in liquid nitrogen before use. |
Crystal Properties | |
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Matthews coefficient | Solvent content |
1.95 | 36.91 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 73.81 | α = 90 |
b = 46.85 | β = 109.15 |
c = 80.27 | γ = 90 |
Symmetry | |
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Space Group | P 1 21 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 | PIXEL | DECTRIS EIGER X 9M | 2019-06-15 | M | SINGLE WAVELENGTH |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | SYNCHROTRON | APS BEAMLINE 21-ID-D | 0.9787 | APS | 21-ID-D |
Data Collection
Overall | |||||||||||||||||||
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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) | Redundancy | Number Reflections (All) | Number Reflections (Observed) | Observed Criterion Sigma (F) | Observed Criterion Sigma (I) | B (Isotropic) From Wilson Plot | |||||
1 | 2.2 | 75.83 | 91.8 | 0.077 | 0.086 | 0.037 | 0.995 | 6.8 | 5.1 | 24478 | 47.78 |
Highest Resolution Shell | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | R Merge I (Observed) | Rpim I (All) | CC (Half) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | |||||||||
1 | 2.2 | 2.27 | 59.8 | 1.084 | 0.699 | 0.383 | 3.2 |
Refinement
Statistics | |||||||||||||||||||
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Diffraction ID | Structure Solution Method | Cross Validation method | Starting model | Resolution (High) | Resolution (Low) | Cut-off Sigma (F) | Number Reflections (Observed) | Number Reflections (R-Free) | Percent Reflections (Observed) | R-Factor (Observed) | R-Work | R-Free | Mean Isotropic B | ||||||
X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | THROUGHOUT | 3P8E | 2.2 | 62.56 | 1.33 | 24448 | 1205 | 91.61 | 0.2103 | 0.2075 | 0.2668 | 71.5289 |
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] | |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | 4234 |
Nucleic Acid Atoms | |
Solvent Atoms | 34 |
Heterogen Atoms |
Software
Software | |
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Software Name | Purpose |
Aimless | data scaling |
PHENIX | refinement |
PDB_EXTRACT | data extraction |
MOSFLM | data reduction |
PHENIX | phasing |