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Mini-Mu transposition of bacterial genes on the transmissible plasmid
M Weiserová1, J Hubácek, V Brenner
1Institute of Microbiology, Czechoslovak Academy of Sciences, Prague.
Abstract:
Using the pRM30 plasmid, an Aps deletion derivative of broad host range plasmid RP4 with integrated new miniMu 5 (11 kb), we followed the transfer of Escherichia coli chromosomal genes to the recipient strain. The miniMu 5-mediated transposition of chromosomal genes occurs onto the plasmid with integrated miniMu 5 rather than onto the "recipient" plasmid pNH602. The plasmid DNA in recipient cells was detected by electrophoresis. One of the acquired hybrid plasmids pTB2 was analyzed genetically and by restriction endodeoxyribonuclease digestion. A structure consisting of miniMu-chromosomal segment-miniMu as a product of Mu-mediated transposition was detected.
Insights
Escherichia coli chromosomal genes were transferred to a recipient strain using a modified plasmid (pRM30) containing miniMu 5. Gene transfer occurred via miniMu 5-mediated transposition onto the plasmid, creating hybrid plasmids with integrated chromosomal DNA segments.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- Broad host range plasmids like RP4 are crucial for genetic transfer in bacteria.
- Transposable elements, such as miniMu, facilitate the movement of genetic material.
- Understanding gene transfer mechanisms is vital for genetic engineering and microbial research.
Purpose of the Study:
- To investigate the transfer of Escherichia coli chromosomal genes to a recipient strain.
- To characterize the mechanism of gene acquisition mediated by miniMu 5.
- To analyze the structure of hybrid plasmids formed during this process.
Main Methods:
- Utilized the pRM30 plasmid, a derivative of RP4 with integrated miniMu 5.
- Performed gene transfer experiments with Escherichia coli.
- Detected plasmid DNA in recipient cells using electrophoresis.
- Analyzed hybrid plasmids (e.g., pTB2) genetically and via restriction endonuclease digestion.
Main Results:
- MiniMu 5-mediated transposition of chromosomal genes occurred onto the pRM30 plasmid, not the recipient plasmid.
- Hybrid plasmids containing integrated chromosomal segments were successfully created.
- Electrophoresis confirmed the presence of plasmid DNA in recipient cells.
- Analysis revealed a miniMu-chromosomal segment-miniMu structure as a product of transposition.
Conclusions:
- MiniMu 5 can mediate the transposition of bacterial chromosomal genes onto a conjugative plasmid.
- This process results in the formation of hybrid plasmids carrying foreign DNA.
- The findings provide insights into novel mechanisms of gene transfer and plasmid engineering.