Development of a broad-host-range sacB-based vector for unmarked allelic exchange

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• 作者：Christopher J Marx (1)
  
• 刊名：BMC Research Notes
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：1
• 期：1
• 全文大小：209KB
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• 作者单位：Christopher J Marx (1)
  
  1. Department of Organismic and Evolutionary Biology, Harvard University, 3083 Biological Laboratories, 16 Divinity Avenue, Cambridge, MA, 02138, USA
  

文摘

Background Although genome sequences are available for an ever-increasing number of bacterial species, the availability of facile genetic tools for physiological analysis have generally lagged substantially behind traditional genetic models. Results Here I describe the development of an improved, broad-host-range "in-out" allelic exchange vector, pCM433, which permits the generation of clean, marker-free genetic manipulations. Wild-type and mutant alleles were reciprocally exchanged at three loci in Methylobacterium extorquens AM1 in order to demonstrate the utility of pCM433. Conclusion The broad-host-range vector for marker-free allelic exchange described here, pCM433, has the advantages of a high copy, general Escherichia coli replicon for easy cloning, an IncP oriT enabling conjugal transfer, an extensive set of restriction sites in its polylinker, three antibiotic markers, and sacB (encoding levansucrase) for negative selection upon sucrose plates. These traits should permit pCM433 to be broadly applied across many bacterial taxa for marker-free allelic exchange, which is particularly important if multiple manipulations or more subtle genetic manipulations such as point mutations are desired.