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Blocking factors and the isolation of glutathione transferases from Hymenolepis diminuta (Cestoda: Cyclophyllidea)
Published online by Cambridge University Press: 06 April 2009
Summary
Four acidic glutathione (GSH) transferase forms were isolated from the cytosol of the adult cestode Hymenolepis diminuta by hydroxylapatite chromatography, glutathione-affinity chromatography and chromatofocusing, pH 7–5. The enzymes were dimers of subunit size approximately 24 kDa and accounted for at least 3% of the total soluble protein. The major GSH transferase had limited catalytic activity but may interact with a range of ligands and function as a binding/passive detoxification protein. An endogenous factor interfered with the binding of the crude cytosolic GSH transferase activity to glutathione-dependent affinity matrices but, following partial purification, the GSH transferase activity successfully interacted with the glutathione affinity matrix.
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