1lkr
From Proteopedia
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MONOCLINIC HEN EGG WHITE LYSOZYME IODIDE
Overview
Hen egg-white lysozyme is one of the most thoroughly studied of enzymes, and has been the subject of study by many methods, including X-ray, crystallography. The present work extends the X-ray crystallography to, higher resolution, includes the positions of the anions, and examines the, contacts of the neighbors in greater detail. Data were collected at room, temperature on a Rigaku R-axis area detector with rotating-anode X-ray, generator to 1.6 A resolution for monoclinic lysozyme iodide at pH 4.0, to, 1.8 A for monoclinic lysozyme iodide at pH 8.0, and to 1.1 A resolution, for triclinic lysozyme nitrate at pH 4.5. The structures have been refined, by SHELX93 with the expected number of anion sites being accounted for., Two regions of the protein have been found to be variable: residues 65-75, and 99-104. Except for 65-75 and 99-104, lysozyme is a very stable, molecule with the crystal forms being held together by the electrostatic, contacts of the anions and by layers of water molecules. The anion, positions can be described as paired half sites, each half being, contributed by a different lysozyme molecule. The many different crystal, forms of lysozyme may be due to different combinations of the many such, half sites on the surface. A hypothesis is presented for lysozyme in the, different crystal forms and which may be extended to behavior in solution., Suggestions for future crystallographic research are proposed, involving, anions of different shape and charge.
About this Structure
1LKR is a Single protein structure of sequence from Gallus gallus with IOD as ligand. Active as Lysozyme, with EC number 3.2.1.17 Full crystallographic information is available from OCA.
Reference
Structures of monoclinic lysozyme iodide at 1.6 A and of triclinic lysozyme nitrate at 1.1 A., Steinrauf LK, Acta Crystallogr D Biol Crystallogr. 1998 Sep 1;54(Pt 5):767-80. PMID:9757091
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