1KU3
Crystal Structure of Thermus aquaticus RNA Polymerase Sigma Subunit Fragment, Region 4
Experimental procedure
| Experimental method | SINGLE WAVELENGTH |
| Source type | SYNCHROTRON |
| Source details | NSLS BEAMLINE X25 |
| Synchrotron site | NSLS |
| Beamline | X25 |
| Temperature [K] | 93 |
| Detector technology | CCD |
| Collection date | 2001-09-14 |
| Detector | BRANDEIS - B4 |
| Wavelength(s) | 1.1 |
| Spacegroup name | P 31 2 1 |
| Unit cell lengths | 39.804, 39.804, 66.807 |
| Unit cell angles | 90.00, 90.00, 120.00 |
Refinement procedure
| Resolution | 30.000 - 1.800 |
| R-factor | 0.218 |
| Rwork | 0.218 |
| R-free | 0.25200 |
| Structure solution method | MAD |
| RMSD bond length | 0.005 |
| RMSD bond angle | 1.066 |
| Data reduction software | DENZO |
| Data scaling software | SCALEPACK |
| Phasing software | MLPHARE |
| Refinement software | CNS (1.0) |
Data quality characteristics
| Overall | Outer shell | |
| Low resolution limit [Å] | 30.000 | 1.850 |
| High resolution limit [Å] | 1.800 | 1.800 |
| Rmerge | 0.047 | 0.237 |
| Total number of observations | 49941 * | |
| Number of reflections | 5999 | |
| <I/σ(I)> | 30 | 6.7 |
| Completeness [%] | 98.0 | 99.3 |
| Redundancy | 8.3 |
Crystallization Conditions
| crystal ID | method | pH | temperature | details |
| 1 | Vapor diffusion * | 6 | 22.5 * | MES, ammonium sulfate, magnesium chloride, pH 6, VAPOR DIFFUSION, HANGING DROP, temperature 298K |
Crystallization Reagents in Literatures
| ID | crystal ID | solution | reagent name | concentration (unit) | details |
| 1 | 1 | drop | protein | 6 (mg/ml) | |
| 2 | 1 | reservoir | MES | 0.1 (M) | pH6.0 |
| 3 | 1 | reservoir | ammonium sulfate | 2.4 (M) | |
| 4 | 1 | reservoir | 20 (mM) |
