ausblenden:
Schlagwörter:
phosphotriesterase; reversible flash-cooling; nitrogen calcium coordination
Zusammenfassung:
Diisopropylfluorophosphatases (DFP-ases) are capable of detoxifying chemical warfare agents like diisopropyl fluorophosphate (DFP) by hydrolysis. The protein reported here was recombinantly expressed in E. coli. The X-ray crystal structure of this enzyme has been refined to a resolution of 0.85 Angstrom and a crystallographic R value of 9.4%. Reversible flash-cooling improved both, mosaicity and resolution of the crystals considerably. The overall structure of this protein represents a six-bladed beta-propeller with two calcium ions bound in a central water-filled tunnel. 496 water, 2 glycerol, 2 MES-buffer molecules and 18 PEG fragments of different lengths could be refined in the solvent region. The 208 most reliable residues, without disorder or reduced occupancy in their side-chains, were finally refined without restraints. A subsequent full-matrix refinement cycle for the positional parameters yielded estimated standard deviations (esds) by matrix inversion. The herewith calculated bond lengths and bond-esds were used to obtain averaged bond lengths, which have been compared to the restraints used in preceding refinement cycles. [References: 20]
