Joint X-ray/neutron structure of Thermus thermophilus serine hydroxymethyltransferase (TthSHMT) in internal aldimine state with L-Ser bound in a pre-Michalis complex
X-RAY DIFFRACTION - NEUTRON DIFFRACTION
Starting Model(s)
| Initial Refinement Model(s) | |||
|---|---|---|---|
| Type | Source | Accession Code | Details |
| experimental model | PDB | 2DKJ | |
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | VAPOR DIFFUSION, SITTING DROP | 5.5 | 289 | 40 mM NaOAc pH 5.5, 1.0 M (NH4)2SO4, and 0.5 M Li2SO4 |
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 2.62 | 53.04 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 58.807 | α = 90 |
| b = 83.334 | β = 91.68 |
| c = 95.568 | γ = 90 |
| Symmetry | |
|---|---|
| Space Group | P 1 21 1 |
Diffraction
| Diffraction Experiment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Crystal ID | Scattering Type | Data Collection Temperature | Detector | Detector Type | Details | Collection Date | Monochromator | Protocol | |||||
| 1 | 1 | neutron | 293 | AREA DETECTOR | ORNL ANGER CAMERA | 2022-08-10 | L | LAUE | ||||||
| 2 | 1 | x-ray | 293 | PIXEL | DECTRIS EIGER R 4M | Osmic Varimax | 2022-12-06 | M | SINGLE WAVELENGTH | |||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | SPALLATION SOURCE | ORNL Spallation Neutron Source BEAMLINE MANDI | 2-4.16 | ORNL Spallation Neutron Source | MANDI |
| 2 | ROTATING ANODE | RIGAKU MICROMAX-007 HF | 1.54 | ||
Data Collection
| Overall | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | R Merge I (Observed) | R Sym I (Observed) | Rrim I (All) | Rpim I (All) | CC (Half) | R Split (All) | 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 | 2.3 | 14.43 | 97 | 0.228 | 0.097 | 0.918 | 10.3 | 5.3 | 39816 | ||||||||||
| 2 | 2 | 95.59 | 99.9 | 0.107 | 0.059 | 0.991 | 13.1 | 4.4 | 62552 | ||||||||||
| Highest Resolution Shell | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | R Merge I (Observed) | R-Sym I (Observed) | Rrim I (All) | Rpim I (All) | CC (Half) | R Split (All) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | |||||||
| 1 | 2.3 | 2.38 | 95.9 | 0.245 | 0.115 | 0.638 | 4.7 | 4.4 | |||||||||||
| 2 | 2 | 2.07 | 99.4 | 0.459 | 0.258 | 0.667 | 2.7 | 4.2 | |||||||||||
Refinement
| Statistics | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diffraction ID | Structure Solution Method | Resolution (High) | Resolution (Low) | Cut-off Sigma (I) | Cut-off Sigma (F) | Number Reflections (All) | Number Reflections (Observed) | Number Reflections (R-Free) | Percent Reflections (Observed) | R-Factor (All) | R-Factor (Observed) | R-Work (Depositor) | R-Work (DCC) | R-Free (Depositor) | R-Free (DCC) | R-Free Selection Details | Mean Isotropic B | ||
| NEUTRON DIFFRACTION | MOLECULAR REPLACEMENT | 2.3 | 40 | 2.5 | 39712 | 1981 | 97 | 0.204 | 0.221 | random | 17.68 | ||||||||
| X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | 2 | 40 | 2.5 | 56331 | 2853 | 93.7 | 0.166 | 0.312 | 0.183 | 0.3268 | random | 17.68 | ||||||
| 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 |
| x_torsion_deg | 17.3 |
| x_torsion_deg | 17.3 |
| x_angle_deg | 1 |
| x_angle_deg | 1 |
| x_torsion_impr_deg | 0.76 |
| x_torsion_impr_deg | 0.76 |
| x_bond_d | 0.007 |
| x_bond_d | 0.007 |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 6250 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 396 |
| Heterogen Atoms | 17 |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| nCNS | refinement |
| CrysalisPro | data reduction |
| CrysalisPro | data scaling |
| PHASER | phasing |
| Mantid | data reduction |
| SCALA | data scaling |














