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KMID : 1377020160130010066
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Tissue Engineering and Regenerative Medicine
2016 Volume.13 No. 1 p.66 ~ p.69
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Construction of a new T-vector: Nickase (Nt.BspQI)-generated T-vector bearing a reddish-orange indicator gene
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Choi Ji-Young
Jo Chul-man
Jo Ahn Sang-Mee
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Abstract
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T-vectors are widely used for cloning the polymerase chain reaction (PCR) products. However, the low conversion efficiency of a plasmid into the linear T-vector usually results in non-recombinants. Here, we designed a new plasmid pNBQ-T to easily select the recombinant colonies harboring PCR products. pNBQ-T plasmid, which contains a DsRed indicator gene between two Nt.BspQI restriction cassettes, each of which contains palindromic sequences susceptible to Nt.BspQI nickase (5’-GCTCTTCT^GAAGAGC-3’) at each end. Thus, this plasmid can be easily converted into T-vectors by a nickase (quadruple nicking), which results in two double strand breaks with 3’-thymidine overhangs. DsRed indicator gene, which is inserted between the restriction sites, helps identifying the PCR recombinants. Using this pNBQ-T plasmid the insertion efficiency of a PCR product was examined. We successfully identified white colony of the recombinants with the inserted myostatin promoter gene: the cloning efficiency was 93%. Therefore, this simple method utilizing pNBQ-T plasmid will serve as a useful and efficient technique for preparation of home-made T-vectors.
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KEYWORD
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T-vector, DsRed gene, Cloning, Nickase, Plasmid
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