title: Design, expression and characterization of recombinant hybrid peptide Attacin-Thanatin in Escherichia coli.
abstract: Antimicrobial peptides will be attractive and potential candidates as peptide drugs because of their efficient action against microbes and low toxicity to mammal cells. To improve their antibacterial activity, some modifications needs to be made. In this research, the hybrid peptide gene Attacin-Thanatin with 642 bp in length with preferred codons of E. coli was generated using the technology of Gene splicing by overlap extension. The gene was inserted in-frame into E. coli expression plasmid pET-32a (+) and induced to express in E. coli Rosetta. The recombinant protein was partial purified and its biological activity was determined. Analysis of the E. coli Rosetta induced with IPTG revealed that the molecular weight of fusion protein was approximately 41.8 kDa, which perfectly matched the mass calculated from the amino acid sequence. Biological activity detection showed that this peptide effectively inhibited the growth of the test bacteria including E. coli DH5α, E. coli BL21 (DE3), Salmonella choleraesuis and Staphylococcus aureus. Among these bacteria, the Gram-negative E. coli was the most sensitive. Furthermore, there was minor hemolysis activity for porcine red blood cells. So, the results indicated that the hybrid peptide Attacin-Thanatin could be served as a promising candidate for the chemical antibiotics.
authors.affiliation: Institute of Animal Nutrition, Key Laboratory of Animal Disease-Resistance Nutrition, Ministry of Education, Sichuan Agricultural University, Ya'an, 625014, China.
authors.forename: Li Na
authors.initials: LN
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Yu
authors.forename: Guo Quan
authors.initials: GQ
authors.lastname: Han
authors.forename: Jun
authors.initials: J
authors.lastname: He
authors.forename: Dai Wen
authors.initials: DW
authors.lastname: Chen
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D023181:Antimicrobial Cationic Peptides / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000187:drug effects / Q000378:metabolism*; D008826:Microbial Sensitivity Tests; D010957:Plasmids / Q000235:genetics; D015202:Protein Engineering / Q000379:methods*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D023181:Antimicrobial Cationic Peptides; D011993:Recombinant Fusion Proteins; C554820:attacin-thanatin peptide; C098076:thanatin