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Insertion sequence ISPst4 activates pUC plasmid replication in Pseudomonas stutzeri.

Nicholas V Coleman¹, Jodie Richardson-Harris, Neil L Wilson

¹School of Molecular Bioscience, University of Sydney, Darlington, NSW, Australia.

FEMS Microbiology Letters

|March 11, 2014

Summary

This summary is machine-generated.

A novel insertion sequence (IS) element, ISPst4, in Pseudomonas stutzeri enables plasmids to replicate in new hosts. This IS element facilitates plasmid host range expansion, driving bacterial evolution.

Keywords:

host range mobile genetic elements replication

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Area of Science:

Microbiology
Bacterial Genetics
Molecular Biology

Background:

Insertion sequences (IS) are mobile genetic elements that significantly influence bacterial genome evolution and plasticity.
Plasmids are extrachromosomal DNA molecules crucial for horizontal gene transfer and bacterial adaptation.
Understanding IS-plasmid interactions is key to deciphering mechanisms of bacterial evolution and adaptation.

Discussion:

The newly identified IS element, ISPst4, from Pseudomonas stutzeri, demonstrates an unusual interaction with introduced plasmids.
Transforming Pseudomonas stutzeri with the pUC19 derivative plasmid pUS23 resulted in ampicillin-resistant transformants with poor growth, containing ISPst4 and ISPst5 insertions in recovered plasmids.
ISPst4 insertions within the pUS23 plasmid, specifically between the bla and oriV regions, conferred robust replication capabilities in P. stutzeri, unlike the original pUS23 plasmid.

Key Insights:

ISPst4 and ISPst5 are prevalent in P. stutzeri strains but absent in other pseudomonads, indicating host specificity.
A promoter region within ISPst4 was identified, potentially driving the expression of the pUC oriV in P. stutzeri.
This study presents the first evidence of IS transposition directly expanding a plasmid's effective host range.

Outlook:

Further investigation into the promoter activity of ISPst4 and its precise mechanism of enhancing plasmid replication is warranted.
Exploring the broader implications of IS-mediated host range expansion for plasmid evolution and bacterial adaptation.
Investigating the prevalence and functional significance of ISPst4 in other bacterial species and environments.