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Journal of Biomedical Science

, Volume 6, Issue 1, pp 64–70 | Cite as

Expression of foreign antigens on the surface ofEscherichia coli by fusion to the outer membrane protein TraT

  • Hsin-Hou Chang
  • Shih Yi Sheu
  • Szecheng J. Lo
Original Paper

Abstract

ThetraT gene is one of the F factor transfer genes and encodes an outer membrane protein which is involved in interactions between anEscherichia coli and its surroundings. This protein was altered so as to permit the expression of foreign proteins on the outer membrane ofE. coli in this study. A 729-bp DNA fragment, including the leader and entire structural gene sequence oftraT, was amplified and obtained by PCR. This sequence was then subcloned downstream of thetac promoter of pDR540, resulting in a TraT expression vector, pT2. Here, we report that the expression of TraT protein, fused either with a partial pre-S antigen of hepatitis B virus (60 and 98 amino acids, respectively) or with the snake venom rhodostomin (72 amino acids), was successfully achieved on the outer membrane ofE. coli, using the pT2 plasmid. This result was demonstrated using dot blot and immunofluorescence analysis. This finding supports the notion that the pT2 plasmid can be used as anE. coli display system. This system can detect a foreign peptide of about 100 amino acid residues in length on the bacterial surface.

Key Words

Bacterial display TraT lipoprotein Outer membrane protein Rhodostomin Hepatitis B virus pre-S1 antigen 

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Copyright information

© National Science Council 1999

Authors and Affiliations

  • Hsin-Hou Chang
    • 1
  • Shih Yi Sheu
    • 1
  • Szecheng J. Lo
    • 1
  1. 1.Institute of Microbiology and Immunology School of Life ScienceNational Yang-Ming UniversityTaipeiTaiwan 11221 (ROC)

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