2sbl
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(New page: 200px<br /><applet load="2sbl" size="450" color="white" frame="true" align="right" spinBox="true" caption="2sbl, resolution 2.6Å" /> '''THE THREE-DIMENSIONAL...)
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Revision as of 11:53, 21 November 2007
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THE THREE-DIMENSIONAL STRUCTURE OF AN ARACHIDONIC ACID 15-LIPOXYGENASE
Overview
In mammals, the hydroperoxidation of arachidonic acid by lipoxygenases, leads to the formation of leukotrienes and lipoxins, compounds that, mediate inflammatory responses. Lipoxygenases are dioxygenases that, contain a nonheme iron and are present in many animal cells. Soybean, lipoxygenase-1 is a single-chain, 839-residue protein closely related to, mammalian lipoxygenases. The structure of soybean lipoxygenase-1 solved to, 2.6 angstrom resolution shows that the enzyme has two domains: a, 146-residue beta barrel and a 693-residue helical bundle. The iron atom is, in the center of the larger domain and is coordinated by three histidines, and the COO- of the carboxyl terminus. The coordination geometry is, nonregular and appears to be a distorted octahedron in which two adjacent, positions are not occupied by ligands. Two cavities, in the shapes of a, bent cylinder and a frustum, connect the unoccupied positions to the, surface of the enzyme. The iron, with two adjacent and unoccupied, positions, is poised to interact with the 1,4-diene system of the, substrate and with molecular oxygen during catalysis.
About this Structure
2SBL is a Single protein structure of sequence from Glycine max with FE as ligand. Active as Lipoxygenase, with EC number 1.13.11.12 Full crystallographic information is available from OCA.
Reference
The three-dimensional structure of an arachidonic acid 15-lipoxygenase., Boyington JC, Gaffney BJ, Amzel LM, Science. 1993 Jun 4;260(5113):1482-6. PMID:8502991
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