Abstract
Since its isolation, the human granulocyte–macrophage colony-stimulating factor (hGM-CSF) has been proposed as a new class of therapeutic biological products in the treatment of various diseases. However, the toxicity of this cytokine towards its expression host constitutes a major obstacle to bioprocess development for large-scale production. In this work, the optimized gene encoding hGM-CSF was expressed in the yeast Yarrowia lipolytica in one and two copies under the control of the fatty acid-inducible POX2 promoter. Protein secretion was directed by the targeting sequence of the extracellular lipase (LIP2): preXALip2. After 48 h of induction, Western blot analysis revealed the presence of a nonglycosylated form of 14.5 kDa and a trail of hGM-CSF hyperglycosylated varying from 23 kDa to more than 60 kDa. The two-copy transformants produced hGM-CSF level which was sevenfold higher compared to the single-copy ones. Deglycosylation with PNGase F showed two forms: a mature form of 14.5 kDa and an unprocessed form of 18 kDa. The addition of two alanines to the signal sequence resulted in correct hGM-CSF processing. The production level was estimated at 250 mg/l after preliminary optimization studies of the cultivation and induction phases. The purified hGM-CSF was identified by N-terminal sequencing and LC-MS/MS analysis; its biological activity was confirmed by stimulating the proliferation of TF1 cell line. This study demonstrated that Y. lipolytica is a promising host for the efficient production of active toxic proteins like hGM-CSF.
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Acknowledgments
The authors would like to acknowledge EGIDE for their financial support in the frame of the CMCU project France–Tunisia (grant no. 07 G0913). LC-MS/MS analyses were performed using PAPPSO (Plateforme d’Analyses Protéomiques Paris Sud Ouest, http://pappso.inra.fr) facilities.
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Gasmi, N., Lassoued, R., Ayed, A. et al. Production and characterization of human granulocyte–macrophage colony-stimulating factor (hGM-CSF) expressed in the oleaginous yeast Yarrowia lipolytica . Appl Microbiol Biotechnol 96, 89–101 (2012). https://doi.org/10.1007/s00253-012-4141-x
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DOI: https://doi.org/10.1007/s00253-012-4141-x