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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation

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The conjugation protein TcpC from Clostridium perfringens is structurally related to the type IV secretion system

Corrine J Porter1, Radhika Bantwal, Trudi L Bannam

  • 1ARC Centre of Excellence in Structural and Functional Microbial Genomics, Clayton, Vic. 3800, Australia.

Molecular Microbiology
|December 14, 2011
PubMed

Insights

TcpC protein is crucial for bacterial conjugation in Gram-positive pathogens, facilitating gene transfer by forming stable complexes. Its structure and membrane localization are key to this process.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Structural Biology

Background:

  • Bacterial conjugation is a key mechanism for spreading antibiotic resistance and virulence genes.
  • Understanding conjugation in Gram-positive pathogens is critical for developing new therapeutic strategies.
  • The model plasmid pCW3 from Clostridium perfringens provides a system to study Gram-positive conjugation.

Purpose of the Study:

  • To elucidate the mechanism of bacterial conjugation mediated by the pCW3 plasmid in Gram-positive pathogens.
  • To characterize the role and structural features of the TcpC protein in conjugative transfer.
  • To investigate the interactions of TcpC with other conjugation proteins and its localization.

Main Methods:

  • Investigated conjugation using the model plasmid pCW3 from Clostridium perfringens.
  • Determined the crystal structure of the C-terminal component of TcpC (TcpC(99-359)).
  • Utilized bacterial two-hybrid studies to analyze protein-protein interactions and membrane localization assays.

Main Results:

  • TcpC protein is essential for efficient conjugative transfer of pCW3.
  • TcpC localizes to the cell membrane, and this localization is vital for its function, oligomerization, and interaction with other conjugation proteins.
  • The crystal structure of TcpC(99-359) revealed two NTF2-like domains with structural homology to VirB8 periplasmic regions.
  • Both N-terminal and C-terminal regions of TcpC are important for its function and interactions.

Conclusions:

  • TcpC forms oligomeric complexes that stabilize the conjugation apparatus, thereby facilitating efficient plasmid transfer.
  • The structural similarity of TcpC domains to VirB8 suggests conserved mechanisms in conjugation and type IV secretion systems.
  • TcpC is a multifunctional protein critical for the structural integrity and function of the conjugation machinery in Gram-positive bacteria.

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