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.
journal_name
World J Microbiol Biotechnoljournal_title
World journal of microbiology & biotechnologyauthors
Hou H,Zhang Z,Zhao W,Hou Jdoi
10.1007/s11274-012-1023-4subject
Has Abstractpub_date
2012-05-01 00:00:00pages
2175-80issue
5eissn
0959-3993issn
1573-0972journal_volume
28pub_type
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