PMID: 8590307Nov 1, 1995Paper

Expression of a human mutant monocyte chemotactic protein 3 in Pichia pastoris and characterization as an MCP-3 receptor antagonist

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
S MasureG Opdenakker

Abstract

The cDNA encoding human monocyte chemotactic protein 3 (hMCP-3) was cloned in pHIL-S1, a vector designed for inducible secreted heterologous expression in the methylotrophic yeast Pichia pastoris. After transformation of P. pastoris by electroporation, several clones with the human MCP-3 gene integrated at the alcohol oxidase (AOX-1) locus were isolated. One of these clones (M30) expressed the mature MCP-3 protein with three additional amino acids at its NH2 terminus as a secretion product in the supernatant. The recombinant protein comigrated on SDS-PAGE and cross-reacted immunologically with synthetic hMCP-3. Intermediate-scale production in shake flasks was obtained at expression levels of approximately 1 mg per liter. The recombinant mutant MCP-3 was purified to homogeneity by adsorption on silicic acid, affinity chromatography on heparin-Sepharose, and reversed-phase HPLC. At the amino terminus of the purified recombinant protein, the presence of the additional sequence Arg-Glu-Phe was confirmed by direct protein sequence analysis. The recombinant hMCP-3 mutein was not glycosylated, as evidenced by deglycosylation experiments and by mass spectrometry. In analogy with MCP-1, the amino terminus of MCP-3 is crucial for its ag...Continue Reading

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