1IEE image
Entry Detail
PDB ID:
1IEE
Keywords:
Title:
STRUCTURE OF TETRAGONAL HEN EGG WHITE LYSOZYME AT 0.94 A FROM CRYSTALS GROWN BY THE COUNTER-DIFFUSION METHOD
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2001-04-09
Release Date:
2001-08-08
Method Details:
Experimental Method:
Resolution:
0.94 Å
R-Value Free:
0.15
R-Value Work:
0.12
R-Value Observed:
0.12
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:LYSOZYME C
Chain IDs:A
Chain Length:129
Number of Molecules:1
Biological Source:Gallus gallus
Primary Citation
Structure of tetragonal hen egg-white lysozyme at 0.94 A from crystals grown by the counter-diffusion method.
Acta Crystallogr.,Sect.D 57 1119 1126 (2001)
PMID: 11468395 DOI: 10.1107/S0907444901008873

Abstact

Very high quality crystals of tetragonal hen egg-white lysozyme were grown in the Advanced Protein Crystallization Facility (APCF) on board the Space Shuttle using a modified free-interface diffusion (FID) reactor designed ad hoc to have a longer diffusion path. This design allows the performance of true counter-diffusion experiments. Crystals were obtained under the classical chemical conditions defined 50 y ago with NaCl as a crystallizing agent and acetate pH 4.5 as a buffer. Counter-diffusion crystallization allows a "physical" instead of chemical optimization of growth conditions: indeed, this method screens for the best supersaturation conditions in a single trial and yields crystals of very high quality. A complete diffraction data set was collected at atomic resolution from one of these crystals using synchrotron radiation at the DESY-EMBL beamlines. The overall R(merge) on intensities in the resolution range 31-0.94 A was 5.2% and the data were 98.9% complete. Refinement was carried out with the programs CNS and SHELX97 to a final crystallographic R factor of 12.26% for 72 390 reflections. A mean standard uncertainty in the atomic positions of 0.024 A was estimated from inversion of blocked least-squares matrices. 22 side chains show alternate conformations and the loop 59-75 adopts in the same crystal packing two conformations that were observed for either triclinic or tetragonal lysozyme in previous high-resolution studies. In addition to 255 water molecules, the crystallizing agent (one hexacoordinated sodium ion and five chloride anions) participates in the ordered lysozyme hydration shell.

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