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A new tool for cloning and gene expression in Streptococcus pneumoniae
Susana Domingues1, Andreia Cunha Aires, Mari Luz Mohedano
1Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal. susanadomingues@itqb.unl.pt
Plasmid
|May 28, 2013
Summary
New plasmids were introduced into Streptococcus pneumoniae for gene cloning and expression. These stable, small vectors enable genetic manipulation and expression of pneumococcal genes, enhancing research capabilities.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Streptococcus pneumoniae is a significant human pathogen.
- Efficient genetic tools are crucial for studying S. pneumoniae.
- Existing cloning vectors have limitations for gene expression.
Purpose of the Study:
- To introduce and evaluate novel non-integrative plasmids for cloning and gene expression in S. pneumoniae.
- To establish lactococcal theta-replicating plasmids (pIL253 and pIL252) in pneumococcal hosts.
- To demonstrate the utility of these plasmids as expression vectors.
Main Methods:
- Introduction of lactococcal plasmids pIL253 (high-copy) and pIL252 (low-copy) into S. pneumoniae.
- Cloning and expression of the pneumococcal RNase R gene using pIL253.
- Co-habitation experiments with pLS1 (rolling circle replication).
Main Results:
- pIL253 and pIL252 were successfully established in S. pneumoniae.
- Constitutive expression of the RNase R gene was achieved using pIL253.
- S. pneumoniae strains could simultaneously harbor pIL252/pIL253 and pLS1.
Conclusions:
- The established plasmids are stable, small, and possess multi-cloning sites, making them valuable genetic tools for S. pneumoniae.
- These vectors facilitate gene expression and allow for copy number regulation.
- The ability to co-replicate plasmids expands genetic manipulation possibilities in S. pneumoniae.
