Abstract
Objectives
To establish a positive cloning system with a zero background for high-throughput DNA cloning purpose.
Results
The cloning vector, pRI857, and the genomic-library construction vector, pRI857-BAC, were constructed based on the mechanism of expression of the thermo-sensitive cI857 repressor gene that can stringently repress the PR promoter and kanamycin resistance gene (PR-kan R) at 30 °C, but have no effect on PR-kan R gene at 37 °C or at higher temperatures. When the pRI857 vectors were transformed into E. coli with or without a target foreign DNA fragment inserted at the BfrBI site of the cI857 gene, only colonies with the foreign DNA fragment survive. We extended this method to construct a pRI857-BAC vector for genomic library cloning which displays an efficiency of ~107 cfu per µg of genomic DNA, with no empty vectors detected.
Conclusions
Cloning by indirect activation of resistance marker gene represents a novel DNA-capturing system, which can be widely applied for high-throughput DNA cloning.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant No. 21271104 and 21671103 for Yi J, and 31300111 for Wang Y). The strain Pseudomonas syrigae HS191 was a gift from Dr. Dennis C Gross (Texas A&M University).
Supporting information
Supplementary Table 1—The bacterial strains and plasmids used.
Supplementary Table 2—Sequence of primers used.
Supplementary Fig. 1—Plasmid map of the pRI857-BAC vector.
Supplementary Fig. 2—Cloning test of the ble R gene using pRI857 vector.
Supplementary Fig. 3—Cloning test of the PluxI-sfGFP gene using pRI857 vector.
Supplementary Fig. 4—Cloning test of the 16S rRNA gene from strain P. syringae HS191 using pRI857 vector.
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This article does not contain any studies with human participants or animals performed by any of the authors.
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Accession Numbers
The sequences reported in this article were deposited in the GenBank database [accession numbers: KX774470 (pRI857), KX774471 (pRI857-BAC)].
An erratum to this article is available at http://dx.doi.org/10.1007/s10529-017-2316-3.
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Zhang, K., Su, H., Yang, M. et al. Construction of a thermo-sensitive pRI857 vector for efficient DNA capturing in Escherichia coli . Biotechnol Lett 39, 905–909 (2017). https://doi.org/10.1007/s10529-017-2313-6
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DOI: https://doi.org/10.1007/s10529-017-2313-6