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http://dx.doi.org/10.7841/ksbbj.2015.30.3.103

In situ Recovery of hGM-CSF in Transgenic Rice Cell Suspension Cultures  

Myoung, Hyun-Jong (Department of Biological Engineering, Inha University)
Choi, Hong-Yeol (Department of Biological Engineering, Inha University)
Nam, Hyung-Jin (Department of Biological Engineering, Inha University)
Kim, Dong-Il (Department of Biological Engineering, Inha University)
Publication Information
KSBB Journal / v.30, no.3, 2015 , pp. 103-108 More about this Journal
Abstract
Production of foreign proteins by transgenic plant cell cultures has several advantages such as post-translational modification, low risk of product contamination and low-cost production and purification. However, target proteins are degraded by extracellular proteases existing in the media. A solution to this problem is the use of perfusion culture and ion exchange chromatography for the application of integrated bioprocess using in situ recovery. With this method, production of human granulocyte-macrophage colony-stimulating factor (hGM-CSF) was investigated in this study. First, optimization of cell concentration during the induction phase for the production of hGM-CSF was examined. As cell concentration increased, the level of hGM-CSF was decreased due to the presence of extracellular proteases. Induction using sugarfree media produced 33% more hGM-CSF. The effects of pH on the binding of hGM-CSF to cationic and anionic exchange resins were also investigated. In terms of stability, optimal pH was found to be 5~7. In the case of using buffer exchange when CM-Sepharose was used as a cationic exchange resin, optimal pH for binding was 4.8 and adsorption yield was 77%. When DEAE-Sepharose was used as an anionic exchange resin, it was 5.5 (74%). Without buffer exchange, optimal pH was 4.6 (84%). From these results, an integrated bioprocess using in situ recovery with simultaneous production and separation of foreign protein in transgenic plant cell suspension cultures was found to be feasible.
Keywords
Plant cell culture; In situ recovery; Perfusion culture; Purification;
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