Isolation and purification of a biologically active human platelet-derived growth factor BB expressed in Escherichia coli

Human platelet-derived growth factor (PDGF) was expressed in Escherichia coli from a high-level cytoplasmic expression vector. A cDNA fragment encoding the mature form of the human PDGF B chain (hPDGFB) was cloned into a plasmid under transcriptional control of the inducible E. coli Tac promoter. Ex...

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Veröffentlicht in:Protein expression and purification 1992-06, Vol.3 (3), p.204-211
Hauptverfasser: Alexander, Denise M., Hesson, Thomas, Mannarino, Anthony, Cable, Michael, Dalie, Barbara L.
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Sprache:eng
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Zusammenfassung:Human platelet-derived growth factor (PDGF) was expressed in Escherichia coli from a high-level cytoplasmic expression vector. A cDNA fragment encoding the mature form of the human PDGF B chain (hPDGFB) was cloned into a plasmid under transcriptional control of the inducible E. coli Tac promoter. Expression of hPDGF-B from the final construct, pTacBI q, is regulated by the lactose repressor (LacI q). Upon induction, a polypeptide of approximately 14 kDa that had the same molecular mass and immunoreactivity as authentic hPDGF-B was produced. The production of recombinant hPDGF-B was significantly increased in an E. coli strain (CAG629) defective in expression of the lon protease. Expression of hPDGF-B in the CAG629 strain accounted for approximately 1% of total cell protein. In this system, hPDGF-B is expressed as an insoluble, intracellular protein and can readily be obtained in a partially purified purm after differential centrifugation. Amino acid sequence determination of the purified protein has verified that the amino-terminal portion of the recombinant PDGF is correct. After renaturation into dimers, the purified recombinant hPDGF is fully functional in assays for receptor binding and mitogenesis.
ISSN:1046-5928
1096-0279
DOI:10.1016/1046-5928(92)90016-P