1TUW
Structural and Functional Analysis of Tetracenomycin F2 Cyclase from Streptomyces glaucescens: A Type-II Polyketide Cyclase
X-RAY DIFFRACTION
Crystallization
Crystalization Experiments | ||||
---|---|---|---|---|
ID | Method | pH | Temperature | Details |
1 | MICROBATCH | 7.5 | 278 | Crystals of tetracenomycin F2 cyclase were grown by microbatch from a solution composed of 2.2 M (NH4)2SO4, 3 mg/ml protein, 50 mM HEPES pH 7.5 at 4 C (11). Large crystals were obtained by macroseeding with small crystals (0.06 mm x 0.08 mm) washed in macroseeding 1.4 M (NH4)2SO4, 50 mM HEPES pH 7.5 to slightly dissolve the crystal surfaces. After 3 to 4 weeks the crystals attained a size of 0.3 x 0.3 x 0.6 mm. Crystals of the selenomethionine labeled protein were obtained in a similar manner., Micro batch, temperature 278K |
Crystal Properties | |
---|---|
Matthews coefficient | Solvent content |
2.32 | 47 |
Crystal Data
Unit Cell | |
---|---|
Length ( Å ) | Angle ( ˚ ) |
a = 46.7 | α = 90 |
b = 46.7 | β = 90 |
c = 188.3 | γ = 120 |
Symmetry | |
---|---|
Space Group | P 65 2 2 |
Diffraction
Diffraction Experiment | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID # | Crystal ID | Scattering Type | Data Collection Temperature | Detector | Detector Type | Details | Collection Date | Monochromator | Protocol | |||||
1 | 1 | x-ray | 273 | AREA DETECTOR | SIEMENS HI-STAR | gobel | 2000-03-01 | M | MAD |
Radiation Source | |||||
---|---|---|---|---|---|
ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | ROTATING ANODE | RIGAKU RU200 |
Data Collection
Overall | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | 1.9 | 30 | 92 | 0.027 | 23.1 | 8.8 | 11605 | 11355 |
Highest Resolution Shell | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | R Merge I (Observed) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | |||||||||||
1 | 1.9 | 2 | 84 | 0.088 | 5.4 |
Refinement
Statistics | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Diffraction ID | Structure Solution Method | 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 | MAD | 1.9 | 30 | 9599 | 9599 | 480 | 0.199 | 0.199 | 0.199 | 0.245 | random |
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 |
t_dihedral_angle_d | 19.3 |
t_angle_deg | 2.61 |
t_bond_d | 0.017 |
Non-Hydrogen Atoms Used in Refinement | |
---|---|
Non-Hydrogen Atoms | Number |
Protein Atoms | 850 |
Nucleic Acid Atoms | |
Solvent Atoms | 79 |
Heterogen Atoms | 5 |
Software
Software | |
---|---|
Software Name | Purpose |
Histar | data collection |
XDS | data reduction |
SOLVE | phasing |
TNT | refinement |
HISTAR | data reduction |
XDS | data scaling |