MboA with Leu-Ala-Arg peptide substrate and two Fe(II) ions bound
X-RAY DIFFRACTION
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | VAPOR DIFFUSION, HANGING DROP | 4.6 | 298 | MboA crystals were prepared via the hanging drop vapor diffusion method in an Coy anaerobic chamber with an atmosphere of < 5 ppm of O2. Hanging drops were prepared by combining equal volumes of MboA (9 mg/mL) protein solution, reservoir solution (0.6 M lithium sulfate and 0.1 M sodium acetate, pH 4.6), and 0.2 uL of a 1:1000 dilution microseed master stock generated from apo crystals for a total drop volume of 2.2 uL. The Fe(II) + substrate bound structure was prepared by incubating apo crystals with 0.4 uL of 100 mM LAR peptide and 100 mM Fe2+ in 0.1 M sodium acetate, pH 4.6 for two hours prior to looping. Crystals were cryoprotected with the addition of 0.75 uL of 40% glycerol in 0.1 M sodium acetate, pH 4.6 and flash frozen in LN2 |
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 4.22 | 70.84 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 157.094 | α = 90 |
| b = 157.094 | β = 90 |
| c = 157.423 | γ = 90 |
| Symmetry | |
|---|---|
| Space Group | P 43 21 2 |
Diffraction
| Diffraction Experiment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Crystal ID | Scattering Type | Data Collection Temperature | Detector | Detector Type | Details | Collection Date | Monochromator | Protocol | |||||
| 1 | 1 | x-ray | 90 | PIXEL | DECTRIS PILATUS3 S 6M | 2025-05-07 | M | SINGLE WAVELENGTH | ||||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | SYNCHROTRON | ALS BEAMLINE 8.3.1 | 1.11 | ALS | 8.3.1 |
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) | Redundancy | Number Reflections (All) | Number Reflections (Observed) | Observed Criterion Sigma (F) | Observed Criterion Sigma (I) | B (Isotropic) From Wilson Plot | |||||
| 1 | 2.45 | 90.76 | 100 | 0.192 | 0.199 | 0.053 | 0.999 | 18.1 | 26.38 | 72777 | |||||||||
| 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) | Redundancy | Number Unique Reflections (All) | ||||||||
| 1 | 2.45 | 2.5 | 100 | 3.043 | 3.158 | 0.842 | 0.571 | 1.4 | 27.05 | ||||||||||
Refinement
| Statistics | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diffraction ID | Structure Solution Method | Cross Validation method | Resolution (High) | Resolution (Low) | Cut-off Sigma (F) | Number Reflections (Observed) | Number Reflections (R-Free) | Percent Reflections (Observed) | R-Factor (Observed) | R-Work (Depositor) | R-Work (DCC) | R-Free (Depositor) | R-Free (DCC) | Mean Isotropic B | |||||
| X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | FREE R-VALUE | 2.45 | 90.76 | 1.33 | 72681 | 3591 | 99.98 | 0.1642 | 0.1626 | 0.1632 | 0.1951 | 0.1955 | 59.45 | |||||
| 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] | |
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| f_dihedral_angle_d | 13.8051 |
| f_angle_d | 0.5396 |
| f_chiral_restr | 0.0367 |
| f_bond_d | 0.007 |
| f_plane_restr | 0.004 |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 7344 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 270 |
| Heterogen Atoms | 423 |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| PHENIX | refinement |
| XDS | data reduction |
| Aimless | data scaling |
| PHASER | phasing |














