title: High-level expression of human beta-defensin-2 gene with rare codons in E. coli cell-free system.
abstract: Human beta-defensin-2 (hBD2) is A small cationic peptide with A broad range of antimicrobial activity. An E. coli cell-free system was employed to express the hBD2 fusion protein by using the hBD2 gene with 14 rare codons. The results showed that the expression level of trxA-hBD2 fusion protein was 0.35 mg/ml, which is the same as that obtained with A synthetic codon-optimized gene. By using another fusion partner (GFP), similar high-level expression was also achieved in this cell-free system. This meant that human beta-defensin-2 gene could be directly used to express hBD2 fusion protein efficiently in an E. coli cell-free system without the optimization of codons. The expression level of hBD2 fused with thioredoxin could be further improved up to 2.0 mg/ml by adopting A continuous exchange cell-free system. A simple one-stage affinity purification procedure was also developed to recover this fusion protein efficiently.
authors.affiliation: Institute of Bioengineering, Department of Chemical Engineering and Bioengineering, Zhejiang University, Hangzhou 310027, The People's Republic of China.
authors.forename: Haiqin
authors.initials: H
authors.lastname: Chen
authors.forename: Zhinan
authors.initials: Z
authors.lastname: Xu
authors.forename: Peilin
authors.initials: P
authors.lastname: Cen
mesh_terms: D002474:Cell-Free System; D003062:Codon / Q000235:genetics*; D004926:Escherichia coli / Q000166:cytology / Q000235:genetics*; D015870:Gene Expression / Q000235:genetics*; D006801:Humans; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification; D017422:Sequence Analysis, DNA; D023083:beta-Defensins / Q000096:biosynthesis* / Q000235:genetics* / Q000302:isolation & purification
chemical_list: D003062:Codon; C106641:DEFB4A protein, human; D011993:Recombinant Fusion Proteins; D023083:beta-Defensins