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Expression of Human Growth Hormone in Silkworm Larvae through RecombinantBombyx moriNuclear Polyhedrosis Virus

Sumathy, S and Palhan, Vikas B and Gopinathan, Karumathil P (1996) Expression of Human Growth Hormone in Silkworm Larvae through RecombinantBombyx moriNuclear Polyhedrosis Virus. In: Protein Expression and Purification, 7 (3). pp. 262-268.

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We have generated a recombinantBombyx morinuclear polyhedrosis virus, vBmhGH, harboring the full-length human growth hormone gene (2.4-kb genomic DNA, with four introns and the signal peptide sequences) under the control of the polyhedrin promoter. BmN cells in culture infected with the recombinant virus showed the presence of RNA corresponding to the authentic growth hormone mRNA as well as its incompletly processed precusor. Electrophoretic analysis and immunoprecipitation of proteins of recombinant virus-infected BmN cells revealed the presence of the growth hormone protein. Infection of silkworm larvae with vBmhGH led to the synthesis and efficient secretion of the protein into hemolymph. The recombinant human growth hormone was biologically active in a radioreceptor competition binding assay. The secreted protein was isolated and purified to homogeneity by a single step immunoaffinity chromatography, to a specific activity of 2.4 × 104U/mg. The recombinant hGH retained the immunological and biolological properties of the native peptide. We conclude that BmNPV vectors can be used successfully for expressing chromosomal genes harboring multiple introns.

Item Type: Journal Article
Publication: Protein Expression and Purification
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 19 Jan 2010 07:51
Last Modified: 19 Sep 2010 05:51
URI: http://eprints.iisc.ac.in/id/eprint/24796

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