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Functional interactions between type IV secretion systems involved in DNA transfer and virulence
Héctor D de Paz1, Félix J Sangari1, Silvia Bolland1
1Departamento de Biología Molecular (Unidad Asociada al CIB-CSIC), Universidad de Cantabria, C. Herrera Oria s/n, 39011 Santander, Spain.
Microbiology (Reading, England)
|November 8, 2005
Summary
This study reveals that conjugative coupling proteins (T4CPs) interact with the VirB10 component of both conjugative (cT4SS) and pathogenic (pT4SS) type IV secretion systems. This interaction allows for the creation of hybrid systems capable of DNA transfer into animal cells.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Type IV secretion systems (T4SS) are crucial for horizontal DNA transfer (cT4SS) and bacterial pathogenicity (pT4SS).
- Previous research established that conjugative coupling proteins (T4CPs) interact with the VirB10 component of cT4SS to facilitate DNA transfer.
Purpose of the Study:
- To investigate the functional interactions between cT4SS and pT4SS.
- To explore the potential for creating hybrid T4SS by exchanging components between different systems.
Main Methods:
- Two-hybrid analysis was employed to study protein interactions.
- Complementation assays were performed using components from different T4SS.
Main Results:
- Conjugative T4CPs were found to interact with the VirB10 element of pT4SS from Agrobacterium tumefaciens, Bartonella tribocorum, and Brucella suis.
- Partial substitution of a cT4SS VirB10 component with a pT4SS counterpart enabled conjugation, suggesting the possibility of hybrid T4SS construction.
- Exchange of components was limited to the 'core complex,' indicating its conserved role as a transport scaffold.
Conclusions:
- The findings demonstrate conserved interactions between T4SS components across different functional classes.
- Hybrid T4SS can be engineered, opening avenues for delivering DNA into animal cells.
- The 'core complex' of T4SS represents a conserved structural scaffold, while 'peripheral components' are system-specific.