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Horn, T. and Iyanov, I. and Di Venere, A. (2013) Molecular basis for the catalytic inactivity of a naturally occurring near-null variant of human ALOX15. Biochimica Et Biophysica Acta-Molecular And Cell Biology Of Lipids , 1831 (12). pp. 1702-1713.

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Mammalian lipoxygenases belong to a family of lipid-peroxidizing enzymes, which have been implicated in cardiovascular, hyperproliferative and neurodegenerative diseases. Here we report that a naturally occurring mutation in the hALOX15 gene leads to expression of a catalytically near-null enzyme variant (hGly422Glu). The inactivity may be related to severe misfolding of the enzyme protein, which was concluded from CD-spectra as well as from thermal and chemical stability assays. In silico mutagenesis experiments suggest that most mutations at hGly422 have the potential to induce sterical clash, which might be considered a reason for protein misfolding. hGly422 is conserved among ALOX5, ALOX12 and ALOX15 isoforms and corresponding hALOX12 and hALOX5 mutants also exhibited a reduced catalytic activity. Interestingly, in the hALOX5 Gly429Glu mutants the reaction specificity of arachidonic acid oxygenation was shifted from 5S- to 8S- and 12R-H(p)ETE, formation. Taken together, our data indicate that the conserved glycine is of functional importance for these enzyme variants and most mutants at this position lose catalytic activity. (C) 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Animal Genetics and Genomics
Depositing User: Unnamed user with email alok@urdip.res.in
Date Deposited: 18 Mar 2015 07:59
Last Modified: 18 Mar 2015 08:19
URI: http://niab.sciencecentral.in/id/eprint/8

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