Abstract
A completely automated purification of glutathione-S-transferase (GST) fusion proteins, either in soluble form or after renaturation of insoluble inclusion bodies, is described. Depending on the expression levels and the amount of glutathione affinity matrix employed, the protocol yields approximately 30–100 μg of purified GST-fusion protein from 2 mL microplate cultures. The high yield is facilitated by employing an efficient chemical/enzymatic lysis procedure for preparing bacterial cell lysates. Insoluble GST-fusion proteins are automatically refolded by a high-throughput robotic microdialysis procedure that also assesses the degree of successful refolding by integrated GST enzymatic assays and quantitation of soluble protein successfully recovered after affinity purification. For soluble GST-fusion proteins the purification procedure is normally completed within 60 min, whereas urea-based denaturation–renaturation strategies typically require an additional 18 h. The integration of quantitation of cell growth and affinity-purified GST-fusion protein yield allows direct comparisons of different expression constructs and the yield of soluble GST-fusion proteins to be optimized in a systematic manner.
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Acknowledgments
The work described here was funded in part by grants to R.O.J.W. (BBSRC: BB/E000975/1 and BB/D5230001/1, MRC G0501703 and Wellcome Trust: 072563/Z/03/Z and 078043/Z/05/Z).
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Weinzierl, R.O.J. (2022). Robotic Affinity Purification of Soluble and Insoluble Recombinant Glutathione-S-Transferase Fusion Proteins. In: Ayyar, B.V., Arora, S. (eds) Affinity Chromatography. Methods in Molecular Biology, vol 2466. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2176-9_7
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DOI: https://doi.org/10.1007/978-1-0716-2176-9_7
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