3ZD5
THE 2.2 A STRUCTURE OF A FULL-LENGTH CATALYTICALLY ACTIVE HAMMERHEAD RIBOZYME
X-RAY DIFFRACTION
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | VAPOR DIFFUSION, HANGING DROP | 301 | THE ENZYME AND SUBSTRATE WERE MIXED IN EQUIMOLAR AMOUNTS IN A SOLUTION CONTAINING 50 MM MES PH 5.5, 1.5 MM EDTA. THE COMPLEX WAS FORMED BY INCUBATING THE MIXTURE AT 95C FOR 2 MIN., THEN AT 65C FOR 2 MIN., AND FINALLY AT 27C FOR 5 MIN. 1 MM MGCL2 WAS INCLUDED IN THE MIXTURE BEFORE THE FINAL INCUBATION STEP. A 10 MG/ML CONCENTRATION OF RNA WAS USED FOR THE CRYSTALLIZATION EXPERIMENTS. THE RESERVOIR SOLUTION CONTAINED 0.5M (NH4)2SO4, 100 MM MES PH 6.5, AND 35% PEG 3350. AFTER MIXING THE RESERVOIR SOLUTION, THE SALT AND PEG PHASES WERE ALLOWED TO SEPARATE, AND ONLY THE SALT PHASE WAS USED FOR THE DROPS. THE CRYSTALS GREW IN HANGING DROPS OF 2 MICROLITERS AFTER 12 MONTHS OF INCUBATION AT 28C. THE CRYSTALS WERE WASHED IN THE SALT PHASE OF THE RESERVOIR SOLUTION PRIOR TO CRYO-FREEZING. |
Crystal Properties | |
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Matthews coefficient | Solvent content |
2.36 | 47.78 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 49.886 | α = 90 |
b = 69.21 | β = 111.83 |
c = 60.076 | γ = 90 |
Symmetry | |
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Space Group | C 1 2 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 | CCD | ADSC QUANTUM 315 | 2006-02-27 | M | SINGLE WAVELENGTH |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | SYNCHROTRON | SSRL BEAMLINE BL9-1 | 0.919, 0.920, 0.9266 | SSRL | BL9-1 |
Data Collection
Overall | |||||||||||||||||||
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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 | 2.2 | 55.73 | 99.2 | 0.04 | 16.9 | 4 | 9712 | 43.18 |
Highest Resolution Shell | |||||||||||||||||||
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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 | 2.2 | 2.32 | 100 | 0.22 | 4.9 | 4.1 |
Refinement
Statistics | |||||||||||||||||||
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Diffraction ID | Structure Solution 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 | Mean Isotropic B | ||||||||
X-RAY DIFFRACTION | MAD | 2.2 | 20.22 | 1.5 | 9615 | 935 | 99.13 | 0.1805 | 0.1768 | 0.2117 |
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] | |
RMS Deviations | |
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Key | Refinement Restraint Deviation |
f_dihedral_angle_d | 15.306 |
f_angle_d | 0.937 |
f_chiral_restr | 0.039 |
f_plane_restr | 0.006 |
f_bond_d | 0.005 |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | |
Nucleic Acid Atoms | 1346 |
Solvent Atoms | 34 |
Heterogen Atoms |
Software
Software | |
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Software Name | Purpose |
PHENIX | refinement |
ADSC | data reduction |
MOSFLM | data scaling |
CNS | phasing |