Abstract
Here we report the first structure of a mammalian 15-lipoxygenase. The protein is composed of two domains; a catalytic domain and a previously unrecognized β-barrel domain. The N-terminal β-barrel domain has topological and sequence identity to a domain in the mammalian lipases, suggesting that these domains may have similar functions in vivo. Within the C-terminal domain, the lipoxygenase substrate binding site is a hydrophobic pocket defined by a bound inhibitor. Arachidonic acid can be docked into this deep hydrophobic pocket with the methyl end extending down into the bottom of the pocket and the acid end tethered by a conserved basic residue on the surface of the enzyme. This structure provides a unifying hypothesis for the positional specificity of mammalian lipoxygenases.
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Gillmor, S., Villaseñor, A., Fletterick, R. et al. The structure of mammalian 15-lipoxygenase reveals similarity to the lipases and the determinants of substrate specificity. Nat Struct Mol Biol 4, 1003–1009 (1997). https://doi.org/10.1038/nsb1297-1003
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DOI: https://doi.org/10.1038/nsb1297-1003
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