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Advances in animal cell recombinant protein production: GS-NS0 expression system

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Abstract

The production of recombinant proteins using mammalian cell expression systems is of growing importance within biotechnology, largely due to the ability of specific mammalian cells to carry out post-translational modifications of the correct fidelity. The Glutamine Synthetase-NS0 system is now one such industrially important expression system.Glutamine synthetase catalyses the formation ofglutamine from glutamate and ammonia. NS0 cellscontain extremely low levels of endogenous glutaminesynthetase activity, therefore exogenous glutaminesynthetase can be used efficiently as a selectablemarker to identify successful transfectants in theabsence of glutamine in the media. In addition, theinclusion of methionine sulphoximine, an inhibitor ofglutamine synthetase activity, enables furtherselection of those clones producing relatively highlevels of transfected glutamine synthetase and henceany heterologous gene which is coupled to it. Theglutamine synthetase system technology has been usedfor research and development purposes during thisdecade and its importance is clearly demonstrated nowthat two therapeutic products produced using thissystem have reached the market place.

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  1. 2.205 School of Biological Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester, M13 9PT (Author for correspondence)

    Louise M. Barnes

  2. GlaxoWellcome Research and Development, South Eden Park Road, Beckenham, Kent, BR3 3BS, UK

    Catherine M. Bentley

  3. 2.205 School of Biological Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester, M13 9PT

    Alan J. Dickson

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Barnes, L.M., Bentley, C.M. & Dickson, A.J. Advances in animal cell recombinant protein production: GS-NS0 expression system. Cytotechnology 32, 109–123 (2000). https://doi.org/10.1023/A:1008170710003

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