Article
Details
Citation
Martinez-Lara E, Leaver M & George S (2002) Evidence from heterologous expression of glutathione S-transferases A and A1 of the plaice (Pleuronectes platessa) that their endogenous role is in detoxification of lipid peroxidation products. Marine Environmental Research, 54 (3-5), pp. 263-266. http://www.sciencedirect.com/science/article/pii/S0141113602001885; https://doi.org/10.1016/S0141-1136%2802%2900188-5
Abstract
cDNA clones for glutathione S-transferases A (GST-A) and A1 (GST-A1) from plaice (Pleuronectes platessa) were expressed as N-terminally 6XHis tagged proteins in Escherichia coli and purified to homogeneity from Ni-NTA silica. GST-A was an efficient catalyst for conjugation of unsaturated alkenals derived from peroxidation of polyunsaturated fatty acids with the highest activity observed with trans-non-2-enal (8 μmol min-1 mg-1). GST-A1 was a very efficient Se-independent glutathione peroxidase with an activity towards cumene hydroperoxide of 25 μmol min-1 mg-1 . Although the enzymes exhibited moderately high activities towards the model substrate 1-chloro-2,4-dinitrobenzene (CDNB) they exhibited little or no activity towards other common prototypical xenobiotic substrates. Together with data for ontogeny, tissue distribution and inducibility of these enzymes, we contend that a primary function of these enzymes is protection from the harmful effects of lipid peroxidation products generated naturally or exacerbated by xenobiotic exposure.
Keywords
plaice; glutathione-S-transferase; lipid oxidation
Journal
Marine Environmental Research: Volume 54, Issue 3-5
Status | Published |
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Publication date | 30/09/2002 |
Publication date online | 28/05/2002 |
URL | http://hdl.handle.net/1893/7615 |
Publisher | Elsevier |
Publisher URL | http://www.sciencedirect.com/…0141113602001885 |
ISSN | 0141-1136 |