2NIP
NITROGENASE IRON PROTEIN FROM AZOTOBACTER VINELANDII
Experimental procedure
| Source type | SYNCHROTRON |
| Source details | SSRL BEAMLINE BL7-1 |
| Synchrotron site | SSRL |
| Beamline | BL7-1 |
| Temperature [K] | 113 |
| Detector technology | IMAGE PLATE |
| Collection date | 1995-03 |
| Detector | MARRESEARCH |
| Spacegroup name | P 21 21 21 |
| Unit cell lengths | 73.120, 90.530, 91.210 |
| Unit cell angles | 90.00, 90.00, 90.00 |
Refinement procedure
| Resolution | 50.000 - 2.200 |
| R-factor | 0.223 |
| Rwork | 0.223 |
| R-free | 0.29000 |
| Structure solution method | MOLECULAR REPLACEMENT |
| Starting model (for MR) | 1nip |
| RMSD bond length | 0.017 |
| RMSD bond angle | 23.900 * |
| Data reduction software | DENZO |
| Data scaling software | SCALEPACK |
| Phasing software | AMoRE |
| Refinement software | X-PLOR (3.8) |
Data quality characteristics
| Overall | Outer shell | |
| Low resolution limit [Å] | 50.000 | 2.280 |
| High resolution limit [Å] | 2.130 | 2.200 |
| Rmerge | 0.085 | 0.309 |
| Total number of observations | 260578 * | |
| Number of reflections | 29060 | |
| <I/σ(I)> | 6.9 | 2.4 |
| Completeness [%] | 92.9 | 94.6 * |
| Redundancy | 4 | 3.8 |
Crystallization Conditions
| crystal ID | method | pH | temperature | details |
| 1 | Batch method * | 8 | PROTEIN WAS CRYSTALLIZED BY LIQUID-LIQUID DIFFUSION METHOD, USING 25-30% PEG 4000, 140-200 MM NA2MOO4, 100 MM TRIS-CL, PH 8.0; PROTEIN WAS HELD IN A BUFFER OF 20% GLYCEROL, 50 MM TRIS-CL, PH 8.0, 450 MM NACL, AND 2 MM NA2S2O4 PRIOR TO CRYSTALLIZATION., liquid-liquid diffusion |
Crystallization Reagents in Literatures
| ID | crystal ID | solution | reagent name | concentration (unit) | details |
| 1 | 1 | 1 | PEG4000 | 25-30 (%) | |
| 2 | 1 | 1 | 140-200 (mM) | ||
| 3 | 1 | 1 | Tris-Cl | 50 (mM) | |
| 4 | 1 | 2 | glycerol | 20 (%) | |
| 5 | 1 | 2 | 450 (mM) | ||
| 6 | 1 | 2 | 2 (mM) | ||
| 7 | 1 | 2 | Tris-HCl | 50 (mM) |
