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Generating DNA sequences encoding tandem peptide repeats suitable for expression and immunological application.

Hongwei Hou1, Zhiqian Zhang, Wei Zhao

  • 1Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Cell Biology, Peking University Cancer Hospital and Institute, 52 Fucheng Road, Beijing 100142, People's Republic of China.

World Journal of Microbiology & Biotechnology
|July 19, 2012
PubMed
Summary
This summary is machine-generated.

A new ligation-PCR method efficiently constructs DNA encoding multiple peptide repeats. This technique enables stable production of tandem peptide repeats in various cells for applications like vaccine development.

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Area of Science:

  • Molecular Biology
  • Biotechnology

Background:

  • Tandem repeats of short peptide sequences have diverse applications.
  • Stable production of these repeats in both prokaryotic and eukaryotic cells is desirable.

Purpose of the Study:

  • To develop a novel method, ligation-PCR, for constructing DNA sequences encoding numerous tandem peptide repeats.
  • To demonstrate the stable expression and utility of these tandem repeats in biological systems.

Main Methods:

  • Ligation-PCR method using double-strand target monomers with cohesive overhangs.
  • PCR amplification of ligation products and direct cloning into the pZeroT TA-cloning vector.
  • Subcloning constructs into prokaryotic (pET-28 c (+)) and eukaryotic (rGHpcDNA3.0) vectors for expression.

Main Results:

  • Successfully obtained constructs with tandem 10-amino-acid myc-tag peptide repeats (0.45-1.2 kb, 15-40 copies).
  • Demonstrated stable expression of proteins with tandem repeats in E. Coli and COS-7 cells.
  • Purified proteins from E. Coli elicited a peptide-specific immune response.

Conclusions:

  • The ligation-PCR method provides a robust way to manipulate peptides at the nucleic acid level.
  • This technique is a foundation for biological peptide synthesis, antibody production, and epitope-based DNA vaccines.