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  • Title: Molecular cloning and characterization of omega class glutathione S-transferase (GST-O) from the polychaete Neanthes succinea: biochemical comparison with theta class glutathione S-transferase (GST-T).
    Author: Rhee JS, Lee YM, Hwang DS, Lee KW, Kim IC, Shin KH, Raisuddin S, Lee JS.
    Journal: Comp Biochem Physiol C Toxicol Pharmacol; 2007 Nov; 146(4):471-7. PubMed ID: 17602891.
    Abstract:
    We cloned and sequenced a full-length cDNA of an omega class glutathione S-transferase (GST-O) from the polychaete Neanthes succinea (ns-GST-O). The full-length cDNA of ns-GST-O was 1562 bp in length, containing an open reading frame (OR) of 732 bp that encoded a 244 amino acid protein. The deduced amino acid sequence of ns-GST-O showed a low similarity with the theta class N. suucinea GST (ns-GST-T). As GSTs play a significant role in antioxidant defense, we checked the expression pattern of ns-GST-O in N. succinea after exposure to copper (CuCl(2) 12 to 72 mug/L), which is an oxidative stress-inducing agent. After exposure to CuCl(2), ns-GST-O gene was dramatically up-regulated and when compared with ns-GST-T the expression pattern was more pronounced at all the concentrations of copper. Even the basal transcription levels of ns-GST-O were higher than those of ns-GST-T. To further characterize the catalytic properties of ns-GST-O, we constructed a recombinant ns-GST-O plasmid with a 6x His-Tag at the N-terminal of the full-length ns-GST-O cDNA. Recombinant ns-GST-O protein was highly expressed in transformed Escherichia coli. The effect of pH, temperature and chemical inhibitors on the enzyme activity of ns-GST-O was also studied and compared with the reported effect of these factors on recombinant ns-GST-T protein. These results suggest that, like other types of GSTs, ns-GST-O protein plays a conserved antioxidant role in the polychaete N. succinea.
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