A new cloning system based on the OprI lipoprotein for the production of recombinant bacterial cell wall-derived immunogenic formulations

J Biotechnol. 2012 Jan;157(1):50-63. doi: 10.1016/j.jbiotec.2011.11.006. Epub 2011 Nov 18.


The conjugation of antigens with ligands of pattern recognition receptors (PRR) is emerging as a promising strategy for the modulation of specific immunity. Here, we describe a new Escherichia coli system for the cloning and expression of heterologous antigens in fusion with the OprI lipoprotein, a TLR ligand from the Pseudomonas aeruginosa outer membrane (OM). Analysis of the OprI expressed by this system reveals a triacylated lipid moiety mainly composed by palmitic acid residues. By offering a tight regulation of expression and allowing for antigen purification by metal affinity chromatography, the new system circumvents the major drawbacks of former versions. In addition, the anchoring of OprI to the OM of the host cell is further explored for the production of novel recombinant bacterial cell wall-derived formulations (OM fragments and OM vesicles) with distinct potential for PRR activation. As an example, the African swine fever virus ORF A104R was cloned and the recombinant antigen was obtained in the three formulations. Overall, our results validate a new system suitable for the production of immunogenic formulations that can be used for the development of experimental vaccines and for studies on the modulation of acquired immunity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • African Swine Fever Virus / genetics
  • Animals
  • Antigens, Viral / genetics
  • Bacterial Proteins / biosynthesis*
  • Bacterial Proteins / genetics
  • Bacterial Proteins / immunology
  • Base Sequence
  • Cells, Cultured
  • Cloning, Molecular / methods*
  • Dendritic Cells / immunology
  • Escherichia coli / genetics
  • Escherichia coli / metabolism
  • Genetic Vectors / genetics*
  • Lipoproteins / biosynthesis*
  • Lipoproteins / genetics
  • Lipoproteins / immunology
  • Macrophages / immunology
  • Mice
  • Molecular Sequence Data
  • Pseudomonas aeruginosa / genetics
  • Recombinant Fusion Proteins / biosynthesis*
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / immunology
  • Tumor Necrosis Factor-alpha / metabolism


  • Antigens, Viral
  • Bacterial Proteins
  • Lipoproteins
  • Recombinant Fusion Proteins
  • Tumor Necrosis Factor-alpha
  • outer membrane lipoprotein I, Bacteria