Construction and expression of bivalent membrane-anchored DNA vaccine encoding Sjl4FABP and Sj26GST genes

J Huazhong Univ Sci Technolog Med Sci. 2006;26(5):493-6. doi: 10.1007/s11596-006-0501-z.

Abstract

In order to construct a eukaryotic co-expression plasmid containing membrane-anchored Sjcl4FABP and Sjc26GST genes and identify their expression in vitro, Sj14 and Sj26 genes were obtained by RT-PCR with total RNA of Schistosoma japonicum adult worms as the template and cloned into eukaryotic expression plasmid pVAC to construct recombinant plasmids pVAC-Sj14 and pVAC-Sj26. Then a 23 amino-acid signal peptide of human interleukin-2 (IL-2) upstream Sj14 or Sj26 gene and a membrane-anchored sequence containing 32 amino-acids of carboxyl-terminal of human placental alkaline phosphatase (PLAP) downstream were amplified by PCR as the template of plasmid pVAC-Sj14 or pVAC-Sj26 only to get two gene fragments including Sj14 gene and Sj26 gene. The two modified genes were altogether cloned into a eukaryotic co-expression plasmid pIRES, resulting in another new recombinant plasmid pIRES-Sj26-Sj14. The expression of Sj14 and Sj26 genes was detected by RT-PCR and indirect immunofluorescent assays (IFA) when the plasmid pIRES-Sj26-Sj14 was transfected into eukaryotic Hela cells. Restriction enzyme analysis, PCR and sequencing results revealed that the recombinant plasmids pVAC-Sj14, pVAC-Sj26 and plRES-Sj26-Sj14 were successfully constructed and the expression of modified Sj14 and Sj26 genes could be detected by RT-PCR and IFA. A bivalent membrane-anchored DNA vaccine encoding Sj14 and Sj26 genes was acquired and expressed proteins were proved to be mostly anchored in cellular membranes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antigens, Helminth / biosynthesis
  • Antigens, Helminth / genetics
  • Antigens, Helminth / immunology*
  • Escherichia coli / genetics
  • Escherichia coli / metabolism
  • Genetic Vectors / genetics
  • Glutathione Transferase / biosynthesis
  • Glutathione Transferase / genetics*
  • Glutathione Transferase / immunology
  • HeLa Cells
  • Helminth Proteins / biosynthesis
  • Helminth Proteins / genetics
  • Helminth Proteins / immunology*
  • Humans
  • Recombinant Fusion Proteins / biosynthesis
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / immunology
  • Schistosomiasis japonica / genetics*
  • Schistosomiasis japonica / immunology
  • Schistosomiasis japonica / prevention & control
  • Vaccines, DNA / biosynthesis*
  • Vaccines, DNA / immunology

Substances

  • Antigens, Helminth
  • Helminth Proteins
  • Recombinant Fusion Proteins
  • Vaccines, DNA
  • Glutathione Transferase