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Determination of Glutamate-Cysteine Ligase (γ-Glutamylcysteine Synthetase) Activity by High-Performance Liquid Chromatography and Electrochemical Detection by Matthew E. Gegg; John B. Clark; Simon J.R. Heales is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The tripeptide glutathione (␥-glutamylcysteinylglycine; GSH) is the predominant low molecular mass thiol in cells. The function of GSH is of considerable interest, with the molecule being implicated in numerous cellular processes in addition to being a major cellular antioxidant. The enzyme glutamate-cysteine ligase (GCL) is the rate-limiting step in GSH synthesis. The GCL assay described here is based on high-performance liquid chromatography and exploits the electrochemically active nature of ␥-glutamylcysteine (␥-GC), the product of GCL activity. This method allows for the direct detection of ␥-GC rather than relying on derivatization of the molecule or linked assays. The sensitivity of the assay is sufficient to allow for the measurement of GCL activity in cultured cells. The specific activity of GCL in rat primary culture astrocytes was 9.7 ؎ 1.7 nmol ␥-GC synthesized/min/mg protein.

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Author

Matthew E. Gegg; John B. Clark; Simon J.R. Heales

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0003-2697)

Published

2002

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)