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. 2001 Aug 15;358(Pt 1):257–262. doi: 10.1042/0264-6021:3580257

Purification and characterization of a glutathione S-transferase Omega in pig: evidence for two distinct organ-specific transcripts.

P Rouimi 1, P Anglade 1, A Benzekri 1, P Costet 1, L Debrauwer 1, T Pineau 1, J Tulliez 1
PMCID: PMC1222055  PMID: 11485575

Abstract

A cytosolic glutathione S-transferase (GST, EC 2.5.1.18) from the recently characterized Omega class [GSTO; Board et al. 2000, J. Biol. Chem. 275, 24798-24806] has been identified in pig organs. It was found widely distributed in the different tissues investigated and especially abundant in liver and muscle. The hepatic enzyme has been purified to homogeneity by using its selective affinity for S-hexylglutathione over GSH, thus providing a simple method to isolate mammalian GSTO. The dimeric protein has a subunit molecular mass of 27328 Da as measured by electrospray ionization MS. Internal peptide sequencing and complete cDNA sequencing revealed strong similarities with its human recombinant orthologue and two rodent GST-like proteins with the ability to catalyse the GSH-dependent reduction of dehydroascorbate. Additional similarities, including the presence of a specific N-terminal extension and of immunological cross-reactivity, support the results. Moreover, this gene encoding GSTO generates two organ-specific transcripts, suggesting transcriptional mechanisms with a significance that is as yet uncharacterized.

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Selected References

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