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J Am Chem Soc. 2001 Nov 7;123(44):10814-20.

Three-dimensional structure of a purple lipoxygenase.

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Department of Chemistry, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA.


Polyunsaturated fatty acid metabolism is governed primarily by two enzymes, prostaglandin H synthase and lipoxygenase. The crystal structure of the metastable product-oxidized purple form of soybean lipoxygenase-3 was determined at 2.0 A resolution. The data reveal that the chromophore corresponds to an iron-peroxide complex, a potential intermediate in the catalyzed reaction. A significant alteration of the iron site accompanies the formation of the complex. The structure, the first for a fatty acid-lipoxygenase complex, also reveals an unexpected mode of binding, and identifies amino acid residues that may play significant roles in catalysis, regio- and stereoselectivity.

[Indexed for MEDLINE]

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