title: Expression, purification, and refolding of a recombinant human bone morphogenetic protein 2 in vitro.
abstract: In this work, the recombinant human bone morphogenetic protein 2 (rhBMP-2) gene was cloned from MG-63 cells by RT-PCR, and the protein was expressed in Escherichia coli expression system, purified by Ni-NTA column under denaturing conditions and refolded at 4°C by urea gradient dialysis. We found that the protein refolding yield was increased with the increase of pH value from pH 6.0 to pH 9.0. The yield was 42% and 96% at pH 7.4 and pH 9.0, respectively, while that at pH 6.0 was only 3.4%. The cell culture results showed that the rhBMP-2 refolded at pH 7.4 urea gradient dialysis had higher biological activity for MG-63 cell proliferation and differentiation than that refolded at pH 9.0 since pH 7.4 is closer to the conditions in vivo leading to the formation of dimers through the interchain disulfide bond. Moreover, the biological activity for MG-63 was promoted with the increase of rhBMP-2 concentration in the cell culture medium. This work may be important for the in vitro production and biomedical application of rhBMP-2 protein.
authors.affiliation: College of Animal Sciences, Zhejiang University, Hangzhou 310027, China.
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yinsun
authors.initials: Y
authors.lastname: Ma
authors.forename: Mingying
authors.initials: M
authors.lastname: Yang
authors.forename: Sijia
authors.initials: S
authors.lastname: Min
authors.forename: Juming
authors.initials: J
authors.lastname: Yao
authors.forename: Liangjun
authors.initials: L
authors.lastname: Zhu
mesh_terms: D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D001861:Bone Regeneration / Q000235:genetics; D001842:Bone and Bones / Q000502:physiology; D045744:Cell Line, Tumor; D002846:Chromatography, Affinity; D003001:Cloning, Molecular; D004926:Escherichia coli; D006801:Humans; D006863:Hydrogen-Ion Concentration; D002479:Inclusion Bodies / Q000235:genetics / Q000378:metabolism*; D058849:Protein Refolding; D020673:Protein Renaturation; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D016212:Transforming Growth Factor beta / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification
chemical_list: D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; C499469:recombinant human bone morphogenetic protein-2