title: Glycerol-assisted hydrophobic interaction chromatography improving refolding of recombinant human granulocyte colony-stimulating factor.
abstract: Efficient refolding of recombinant proteins in the forms of inclusion bodies at higher concentration remains challenging. Here, we report a strategy of a dual-gradient hydrophobic interaction chromatography (HIC) mode to refold recombinant human granulocyte colony-stimulating factor from its inclusion bodies at high protein concentration. The strategy was taken to meet the demand of dynamic refolding proceeding by gradually decrease the denaturant (guanidine-HCl) concentration and gradually increase the hydrophilicity of media (column of Poros PE 20) with glycerol as additive to provide a mild refolding surroundings. Compared with dilution method, this dual-gradient HIC process gave about 8.5-fold of increase in specific activity and 30% increase in soluble protein recovery. Furthermore, much higher protein concentration could be obtained at the same time.
authors.affiliation: Second Clinical College, Dalian Medical University, Dalian, China.
authors.forename: Fangwei
authors.initials: F
authors.lastname: Wang
authors.forename: Yongdong
authors.initials: Y
authors.lastname: Liu
authors.forename: Guanghui
authors.initials: G
authors.lastname: Ma
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Su
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D005990:Glycerol / Q000737:chemistry*; D016179:Granulocyte Colony-Stimulating Factor / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D017510:Protein Folding; D011994:Recombinant Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*
chemical_list: D011994:Recombinant Proteins; D016179:Granulocyte Colony-Stimulating Factor; D005990:Glycerol