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. 1986 Jun;5(6):1193–1197. doi: 10.1002/j.1460-2075.1986.tb04346.x

Expression of murine and human granulocyte-macrophage colony-stimulating factors in S. cerevisiae: mutagenesis of the potential glycosylation sites.

A Miyajima, K Otsu, J Schreurs, M W Bond, J S Abrams, K Arai
PMCID: PMC1166927  PMID: 3525148

Abstract

Murine (m) and human (h) granulocyte--macrophage colony-stimulating factors (GM-CSF) have been expressed in large quantities in Saccharomyces cerevisiae using a secretion vector containing the promoter and leader sequences of the mating pheromone alpha-factor. Functionally active mGM-CSF was identified by a proliferation assay with a factor-dependent cell line and by a granulocyte--macrophage colony formation assay using bone marrow cells. The activity of hGM-CSF was confirmed by stimulation of granulocyte--macrophage colony formation using human cord blood cells. Murine GM-CSF with various apparent mol. wts (13, 18, 24, 34 and 40 kd, as well as a smear of higher mol. wts) was detected in yeast culture medium by protein blotting using a rat monoclonal antibody specific for the mGM-CSF N-terminal region peptide. Protein blotting using a rat monoclonal antibody specific for the hGM-CSF N-terminal region demonstrated that a 15.6-kd and higher mol. wt heterogeneous species were secreted. Mutations introduced at each of the two potential N-linked glycosylation sites in mGM-CSF showed that the 13-kd protein is not glycosylated and the major 18-kd protein is mainly glycosylated at the more C-terminal site, whereas the heterogeneous higher mol. wt species were not affected by the mutations. The N-terminal amino acid of the 13-kd protein was shown to be Ser which was four amino acids in the C-terminal direction from the fusion point.

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Selected References

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