Improved solubilization of recombinant human growth hormone inclusion body produced in Escherichia coli.
Recombinant human growth hormone (r-hGH) overexpressed in Escherichia coli forms inactive and insoluble aggregates as inclusion bodies in the cytoplasm. The efficient solubilization of inclusion bodies is critical for cost-effective production. Contrary to a previous report, in our production system, the solubilization method by alkaline treatment including 2 M urea was ineffective. Hence various buffers containing different concentrations of urea or guanidine hydrochloride (GnHCl) at neutral and alkaline pH were attempted. Efficient solubilization (about 90%) was observed in 100 mM Tris buffer, pH 8.0, with more than 4 M GnHCl, and at pH 12.5 with more than 2 M GnHCl, but not with about 8 M of urea. The r-hGH solubilized at pH 12.5 containing 2 M GnHCl was refolded by simple dilution and purified by DEAE Sepharose anion-exchange chromatography. The biological activity of the resulting r-hGH was comparable with commercially available r-hGH in in vitro cell proliferation assay using the hGH-dependent cell line.
Medical Technology Research Center, Research Division, JCR Pharmaceuticals Co., Ltd., Kobe, Japan. sonoda-h@jcrpharm.co.jp
Hiroyuki
H
Sonoda
Atsushi
A
Sugimura
D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D006358:Hot Temperature; D019382:Human Growth Hormone / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D002479:Inclusion Bodies / Q000378:metabolism*; D050296:Microbial Viability; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D012995:Solubility
D011994:Recombinant Proteins; D019382:Human Growth Hormone