Applied Microbiology and Biotechnology

, Volume 87, Issue 6, pp 2169–2176

Expression of the antimicrobial peptide cecropin fused with human lysozyme in Escherichia coli

Authors

  • Xue-mei Lu
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
  • Xiao-bao Jin
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
  • Han-fang Mei
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
  • Yan Ma
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
  • Fu-jiang Chu
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
  • Yan Wang
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
  • Xiao-bo Li
    • Guangdong Key Laboratory of Pharmaceutical Bioactive SubstancesGuangdong University of Pharmaceutical
Applied Genetics and Molecular Biotechnology

DOI: 10.1007/s00253-010-2606-3

Cite this article as:
Lu, X., Jin, X., Zhu, J. et al. Appl Microbiol Biotechnol (2010) 87: 2169. doi:10.1007/s00253-010-2606-3

Abstract

Lysozyme is an abundant, cationic antimicrobial protein that plays an important role in host defense. It targets the β (1–4) glycosidic bond between N-acetylglucosamine and N-acetylmuramic residues that make up peptidoglycan, making lysozyme highly active against Gram-positive bacteria. However, lysozyme alone is inactive against Gram-negative bacteria because it cannot reach the peptidoglycan layer. Cecropins are cationic molecules with a wide range of antimicrobial activities. The main target for these peptides is the cytoplasmic membrane. We resume that cecopin may disrupt the outer membrane, giving the enzyme access to the peptidoglycan in cell wall. So in the present study, novel hybrid protein combining Musca domestica cecropin (Mdc) with human lysozyme (Hly) was designed. The DNA sequence encoding recombination fusion protein Mdc–hly was cloned into the pET-32a vector for protein expression in Escherichia coli strain BL21 (DE3). The protein was expressed as a His-tagged fusion protein, and the Mdc–hly was released from the fusion by enterokinase cleavage and separated from the carrier thioredoxin. Antimicrobial activity assays showed that the recombinant fusion protein Mdc–hly has improved in vitro antimicrobial activity and action spectrum compared to Mdc and hly. Mdc–hly may have important potential application as a future safely administered human drug and food additive.

Keywords

Human lysozymeCecropinFusion proteinExpression

Copyright information

© Springer-Verlag 2010