2NP7
Crystal structure of the adenine-specific DNA methyltransferase M.TaqI complexed with the cofactor analog AETA and a 10 bp DNA containing an abasic site analog at the target position and pyrrolo-dC at the target base partner position
Experimental procedure
| Experimental method | SINGLE WAVELENGTH |
| Source type | SYNCHROTRON |
| Source details | ESRF BEAMLINE ID14-3 |
| Synchrotron site | ESRF |
| Beamline | ID14-3 |
| Temperature [K] | 100 |
| Detector technology | CCD |
| Collection date | 2005-05-13 |
| Detector | ADSC QUANTUM 4 |
| Spacegroup name | P 21 21 21 |
| Unit cell lengths | 60.210, 70.166, 114.947 |
| Unit cell angles | 90.00, 90.00, 90.00 |
Refinement procedure
| Resolution | 19.930 - 1.900 |
| R-factor | 0.17897 |
| Rwork | 0.177 |
| R-free | 0.22043 |
| Structure solution method | MOLECULAR REPLACEMENT |
| Starting model (for MR) | 1g38 |
| RMSD bond length | 0.010 |
| RMSD bond angle | 1.394 |
| Data scaling software | XDS |
| Phasing software | MOLREP |
| Refinement software | REFMAC (5.2.0005) |
Data quality characteristics
| Overall | Outer shell | |
| Low resolution limit [Å] | 19.930 | 2.000 |
| High resolution limit [Å] | 1.900 | 1.900 |
| Rmerge | 0.194 | 0.747 |
| Number of reflections | 39083 | |
| <I/σ(I)> | 7.88 | 2.77 |
| Completeness [%] | 99.9 | 100 |
| Redundancy | 7.29 | 7.33 |
Crystallization Conditions
| crystal ID | method | pH | temperature | details |
| 1 | VAPOR DIFFUSION, HANGING DROP | 7.3 | 298 | 3 microliters crystallization buffer (10 mM Tris/HCl, 300 mM NaCl, pH 7.3) containing the complex plus 1 microliter reservoir solution (100 mM KCl, 100 mM MgCl2, 6% isopropanol, 50 mM sodium cacodylate, pH 6.0), VAPOR DIFFUSION, HANGING DROP, temperature 298K |
Crystallization Reagents
| ID | crystal ID | solution ID | reagent name | concentration | details |
| 1 | 1 | 1 | Tris/HCl | ||
| 2 | 1 | 1 | NaCl | ||
| 3 | 1 | 1 | H2O | ||
| 4 | 1 | 2 | KCl | ||
| 5 | 1 | 2 | MgCl2 | ||
| 6 | 1 | 2 | isopropanol | ||
| 7 | 1 | 2 | sodium cacodylate | ||
| 8 | 1 | 2 | H2O |
