Abstract
BackgroundNumerous bacterial human growth hormone (hGH) expression methods under conventional fermentation and induction conditions have been described. Despite significant progress made in this area over the past several years, production of recombinant hGH by using cellular expression systems still requires further optimization. Fusion of the ubiquitin (Ub) tag to the hGH protein allowed to increase of the overall efficiency of the biosynthesis and improve the protein stability. Ub is a protein composed of 76 amino acid residues with a molecular mass of 8.6 kDa, expressed in all eukaryotes. This protein is an element of the universal protein modification system, which does not occur in bacteria, and is a useful carrier for heterologous proteins obtained through expression in Escherichia coli. Purification of Ub-fusion proteins is easier than that of unconjugated recombinant proteins, and Ub can be removed by deubiquitinating proteases (DUBs or UBPs).Results and ConclusionIn the present study the UBPD2C protease, a stable UBP1 analog, was produced as a recombinant protein in E. coli and used for production of recombinant human growth hormone (rhGH). hGH was expressed as a fusion protein with Ub as a tag. Our findings show that the UBPD2C protease is very effective in removing the Ub moiety from recombinant Ub-fused hGH. The described approach enables obtaining a considerable yield of rhGH in a purity required for pharmaceutical products.
Highlights
Numerous bacterial human growth hormone expression methods under conventional fermentation and induction conditions have been described
Purification of human growth hormone (hGH) was performed on Phenyl Sepharose fast flow (FF) column and the protein was concentrated on Q Sepharose FF column
The purpose of this study was to develop an efficient method for obtaining recombinant hGH from E. coli
Summary
Numerous bacterial human growth hormone (hGH) expression methods under conventional fermentation and induction conditions have been described. Ub is a protein composed of 76 amino acid residues with a molecular mass of 8.6 kDa, expressed in all eukaryotes. Purification of Ub-fusion proteins is easier than that of unconjugated recombinant proteins, and Ub can be removed by deubiquitinating proteases (DUBs or UBPs). [11,12] This approach has many advantages, including improved quality and efficiency of protein expression as well simplified purification process, which are of great importance in the industrial production of recombinant proteins [13,14,15,16,17,18]. In the production of a specific protein for therapeutic application, human growth hormone (hGH), purity and activity of the enzymes used are important factors. There is still a need for a method to obtain highly active DUB enzyme in a gram-scale quantity for the production of bioactive peptides [4,5,21]
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