Abstract
A simple purification procedure of bioactive human granulocyte macrophage colony stimulating factor (hGM-CSF) secreted in rice cell suspension culture has previously been described. In this study the protein was purified to apparent homogeneity with an overall yield of 80.1% by ammonium sulfate precipitation and a single chromatographic step involving FPLC-anion exchange chromatography. The purified hGM-CSF revealed at least five glycosylated forms ranging from 21.5∼29 kDa, and its biological activity was independent of the glycosylation pattern. This is the first purification report of recombinant hGM-CSF to apparent homogeneity from rice cell suspension cultures.
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