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11:19
Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System
Published on: August 21, 2016
Molecular dissection of a bifidobacterial replicon
Michelle Cronin1, Moritz Knobel, Mary O'Connell-Motherway
1Department of Microbiology, National University of Ireland, Western Road, Cork, Ireland.
Applied and Environmental Microbiology
|October 30, 2007
Summary
Researchers identified a minimal replication region on the Bifidobacterium asteroides cryptic plasmid pCIBAO89. This discovery enabled the creation of efficient Escherichia coli-Bifidobacterium shuttle vectors for genetic manipulation of bifidobacteria.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Cryptic plasmids in Bifidobacterium species are important for genetic studies.
- Understanding plasmid replication mechanisms is crucial for developing genetic tools.
Purpose of the Study:
- To functionally dissect the minimal replication region of the Bifidobacterium asteroides cryptic plasmid pCIBAO89.
- To develop efficient Escherichia coli-Bifidobacterium shuttle vectors for bifidobacteria transformation.
Main Methods:
- Functional dissection of the replication region using transcriptional analyses.
- DNA-binding studies to identify key replication components.
- Construction and testing of shuttle vectors in various bifidobacteria.
Main Results:
- Identified a 1.4-kb segment sufficient for autonomous replication of pCIBAO89.
- Characterized the replication origin (ori89) and the replication initiation protein (Rep89).
- Developed shuttle vectors achieving transformation efficiencies up to 10(6) transformants/µg DNA.
Conclusions:
- The minimal replication region of pCIBAO89 is well-defined.
- The developed shuttle vectors are highly efficient for transforming diverse bifidobacteria species.
- This work provides valuable tools for the genetic manipulation of bifidobacteria.
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