NDLI: Construction and Characterization of a Highly Efficient Francisella Shuttle Plasmid

Content Provider	PubMed Central
Author	Maier, Tamara M. Havig, Andrea Casey, Monika Nano, Francis E. Frank, Dara W. Zahrt, Thomas C.
Copyright Year	2004
Abstract	Francisella tularensis is a facultative intracellular pathogen that infects a wide variety of mammals and causes tularemia in humans. It is recognized as a potential agent of bioterrorism due to its low infectious dose and multiple routes of transmission. To date, genetic manipulation in Francisella spp. has been limited due to the inefficiency of DNA transformation, the relative lack of useful selective markers, and the lack of stably replicating plasmids. Therefore, the goal of this study was to develop an enhanced shuttle plasmid that could be utilized for a variety of genetic procedures in both Francisella and Escherichia coli. A hybrid plasmid, pFNLTP1, was isolated that was transformed by electroporation at frequencies of >1 × 107 CFU μg of DNA−1 in F. tularensis LVS, Francisella novicida U112, and E. coli DH5α. Furthermore, this plasmid was stably maintained in F. tularensis LVS after passage in the absence of antibiotic selection in vitro and after 3 days of growth in J774A.1 macrophages. Importantly, F. tularensis LVS derivatives carrying pFNLTP1 were unaltered in their growth characteristics in laboratory medium and macrophages compared to wild-type LVS. We also constructed derivatives of pFNLTP1 containing expanded multiple cloning sites or temperature-sensitive mutations that failed to allow plasmid replication in F. tularensis LVS at the nonpermissive temperature. In addition, the utility of pFNLTP1 as a vehicle for gene expression, as well as complementation, was demonstrated. In summary, we describe construction of a Francisella shuttle plasmid that is transformed at high efficiency, is stably maintained, and does not alter the growth of Francisella in macrophages. This new tool should significantly enhance genetic manipulation and characterization of F. tularensis and other Francisella biotypes.
Related Links	http://dx.doi.org/10.1128/aem.70.12.7511-7519.2004
Ending Page	7519
Page Count	9
Starting Page	7511
File Format	PDF
ISSN	00992240
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	12
Volume Number	70
Language	English
Publisher	American Society for Microbiology
Publisher Date	2004-12-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Biotechnology Food Science Ecology Applied Microbiology and Biotechnology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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