Abstract
Tandem repeats of single short peptide sequences are useful for many purposes. Here we describe a method called ligation-PCR to construct DNA sequences encoding numerous tandem peptide repeats that can stably produce such repeats in both prokaryotic and eukaryotic cells. The method employs double-strand target monomers consisting of a short peptide coding sequences. These sequences contain 3-bp cohesive overhangs to ensure correct repeat orientation and reading frame during ligation. The ligation products are PCR amplified and directly cloned into a new TA-cloning vector, pZeroT. Constructs containing tandem 10-amino-acid myc-tag peptide coding sequence repeats that ranged from approximately 0.45–1.2 kb, representing 15–40 copies of the corresponding peptide, were successfully obtained by this method. When one of the constructs was subcloned into prokaryotic vector pET-28 c (+) and eukaryotic vector rGHpcDNA3.0, and introduced into E. Coli and COS-7 cells, respectively, proteins containing tandem myc-tag peptide repeats were expressed with expected molecular weights. Purified proteins from E. Coli could successfully stimulate a peptide specific immune response. This method provides a means to manipulate peptides at the nucleic acid level, and can serve as the basis for biological peptide synthesis, epitope-specific antibody production, and epitope-based DNA vaccine construction.
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Acknowledgments
We would like to thank Dr. Daniel Safer of University of Pennsylvania for critical revision of the manuscript. This research was supported by the National Natural Science Foundation of China (39880016, 30971494), Beijing Municipal Outstanding Talents Training Funds in Health Sciences (Grant No. 2011-2-24), and Beijing Municipal Natural Science Foundation (7972010, 5122012).
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Hou, H., Zhang, Z., Zhao, W. et al. Generating DNA sequences encoding tandem peptide repeats suitable for expression and immunological application. World J Microbiol Biotechnol 28, 2175–2180 (2012). https://doi.org/10.1007/s11274-012-1023-4
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DOI: https://doi.org/10.1007/s11274-012-1023-4