1SIG
CRYSTAL STRUCTURE OF A SIGMA70 SUBUNIT FRAGMENT FROM ESCHERICHIA COLI RNA POLYMERASE
X-RAY DIFFRACTION
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | 5.1 | PROTEIN CRYSTALLIZED FROM 50 MM SODIUM ACETATE, 0.5-0.7 M LI2SO4, 5-7% (W/V) PEG 8000, 5 MM DTT, PH 5.1; TRANSFERRED IN EIGHT STEPS TO 50 MM SODIUM ACETATE, 0.5 M LI2SO4, 15% (W/V) PEG 8000, 17.5% GLYCEROL AND 10MM DTT, PH 5.1 |
Crystal Properties | |
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Matthews coefficient | Solvent content |
2.7 | 53 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 79.229 | α = 90 |
b = 79.229 | β = 90 |
c = 134.06 | γ = 90 |
Symmetry | |
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Space Group | P 41 21 2 |
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 | 103 | IMAGE PLATE | FUJI | COLLIMATOR | 1995-08-25 | M |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | SYNCHROTRON | NSLS BEAMLINE X4A | 0.9663, 0.9879 | NSLS | X4A |
Data Collection
Overall | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | R Sym 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 | 2.6 | 15 | 94.9 | 0.063 | 15.1 | 5.84 | 13160 | 48.8 |
Highest Resolution Shell | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | R-Sym I (Observed) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | |||||||||||
1 | 2.6 | 2.66 | 78.3 | 0.27 | 2.5 | 4.63 |
Refinement
Statistics | |||||||||||||||||||
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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 | R-Free | R-Free Selection Details | Mean Isotropic B | ||||||
X-RAY DIFFRACTION | MULTIWAVELENGTH ANOMALOUS DISPERSION | THROUGHOUT | 2.6 | 6 | 2 | 11376 | 1170 | 90.9 | 0.218 | 0.218 | 0.315 | RANDOM | 49.8 |
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] | |
-5.1484 | -5.1484 | 10.2967 |
RMS Deviations | |
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Key | Refinement Restraint Deviation |
x_dihedral_angle_d | 21.6 |
x_scangle_it | 7.95 |
x_mcangle_it | 5.33 |
x_scbond_it | 5.31 |
x_mcbond_it | 3.41 |
x_angle_deg | 1.7 |
x_improper_angle_d | 1.46 |
x_bond_d | 0.014 |
x_bond_d_na | |
x_bond_d_prot |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | 2482 |
Nucleic Acid Atoms | |
Solvent Atoms | 111 |
Heterogen Atoms |
Software
Software | |
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Software Name | Purpose |
MLPHARE | phasing |
X-PLOR | refinement |
DENZO | data reduction |
SCALEPACK | data scaling |