1lz9
From Proteopedia
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ANOMALOUS SIGNAL OF SOLVENT BROMINES USED FOR PHASING OF LYSOZYME
Overview
The anomalous signal of bromide ions, present in the crystal structure of, tetragonal hen egg-white lysozyme through the substitution of NaCl by NaBr, in the crystallization medium, was used for phasing of X-ray data, collected to 1.7 A resolution with a wavelength near the absorption edge, of bromine. Phasing of a single wavelength data set, based purely on, anomalous deltaf " contribution, led to easily interpretable electron, density, equivalent to the complete multiwavelength anonalous dispersion, phasing based on four-wavelength data. The classic small-structure direct, methods program SHELXS run against all anomalous differences gave a, successful solution of six highest peaks corresponding to six bromide ions, in the structure with data limited up to a resolution of 3.5 A., Interpretable maps were obtained at a resolution up to 3.0 A using, programs MLPHARE and DM. Bromide ions occupy well ordered positions at the, protein surface. Phasing based on the single wavelength signal of, anomalous scatterers introduced into the ordered solvent shell can be, proposed as a tool for solving structures of well diffracting crystals.
About this Structure
1LZ9 is a Single protein structure of sequence from Gallus gallus with BR and NA as ligands. Active as Lysozyme, with EC number 3.2.1.17 Full crystallographic information is available from OCA.
Reference
Anomalous signal of solvent bromides used for phasing of lysozyme., Dauter Z, Dauter M, J Mol Biol. 1999 May 28;289(1):93-101. PMID:10339408
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