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Soluble expression and purification of human alpha-defensin-5 in Escherichia coli / 生物工程学报
Chinese Journal of Biotechnology ; (12): 291-296, 2008.
Article in Chinese | WPRIM | ID: wpr-276125
ABSTRACT
DNA fragment containing human alpha-defensin 5 mature peptide (mHD-5) coding sequence with biased codons of E. coli was amplified by PCR, which was subsequently cloned into the plasmid pMAL-p2x in order to create pMAL-p2x-mHD-5 expression vector. The plasmid pMAL-p2x-mHD-5 was transferred into engineered strain BL21(DE3) to express heterogeneous fusion protein (MBP-mHD-5). The soluble MBP-mHD-5 targeted protein inducible expressed by IPTG was accounted for about 30% under optimized conditions. The recombinant mHD-5 (rmHD-5) peptide was successfully purified through a separation process including affinity chromatography, Factor Xa digestion and ion exchange chromatography. The bioactivity of rmHD-5 was examined by bacteria-inhibition tests in liquid culture. The growth of E. coli ATCC25922 was dramatically suppressed with an inhibition rate of 90%, with the presence of 62.5 microg/mL rmHD-5 in the media. These results indicate that the strategy of soluble expression of fusion protein in E. coli can be a useful and practical way to produce bioactive defensins.
Subject(s)
Full text: Available Index: WPRIM (Western Pacific) Main subject: Solubility / Transformation, Bacterial / Recombinant Fusion Proteins / Cloning, Molecular / Alpha-Defensins / Escherichia coli / Genetics / Metabolism Limits: Humans Language: Chinese Journal: Chinese Journal of Biotechnology Year: 2008 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Solubility / Transformation, Bacterial / Recombinant Fusion Proteins / Cloning, Molecular / Alpha-Defensins / Escherichia coli / Genetics / Metabolism Limits: Humans Language: Chinese Journal: Chinese Journal of Biotechnology Year: 2008 Type: Article