1tew
From Proteopedia
STRUCTURE OF HEXAGONAL TURKEY EGG WHITE LYSOZYME AT 1.65 ANGSTROMS RESOLUTION
Overview
The structure of hexagonal turkey egg-white lysozyme (TEWL) has been determined and refined at 1.65 A resolution. The crystals were grown from a 150 mM potassium thiocyanate solution at pH 4.5 and belong to space group P6(1)22 with unit-cell dimensions a = b = 70.96, c = 83.01 A alpha = beta = 90, gamma = 120 degrees. The crystals were isomorphous with those of hexagonal pH 8.0 TEWL. The coordinates of PDB entry code 3LZ2 were therefore used as the initial model and subjected to rigid-body refinement, simulated annealing and least-squares refinement to a final residual of 0.20. The root-mean-square deviations from the ideal bond distances and angles were 0.016 A and 2.2 degrees, respectively. During the refinement, 86 water molecules and one thiocyanate ion were located in the structure. The thiocyanate ion lies close to the interface between two symmetry-related molecules. The S atom of the ion forms two direct intermolecular contacts with Argl4 and interacts indirectly via a network of water molecules to Arg5 of a symmetry-related molecule. The structure provides direct evidence for the mode of thiocyanate binding to arginine residues and suggests a possible mechanism for the efficiency of thiocyanate in crystallizing basic proteins.
About this Structure
1TEW is a Single protein structure of sequence from Meleagris gallopavo. Full crystallographic information is available from OCA.
Reference
Structure of hexagonal turkey egg-white lysozyme at 1.65A resolution., Howell PL, Acta Crystallogr D Biol Crystallogr. 1995 Sep 1;51(Pt 5):654-62. PMID:15299795 Page seeded by OCA on Sat May 3 09:52:02 2008
