Zhang K, Su H, Yang M, Ge J, Li G, Yi J, Wang Y. Construction of a thermo-sensitive pRI857 vector for efficient DNA capturing in Escherichia coli.
Biotechnol Lett 2017;
39:905-909. [PMID:
28251389 DOI:
10.1007/s10529-017-2313-6]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 02/24/2017] [Indexed: 11/24/2022]
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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