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CpoS-Inc interactions facilitate host cell modulation during Chlamydia trachomatis infection

Xavier Tijerina1, C A Jabeena1, Robert Faris1

  • 1Department of Microbiology and Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.

Infection and Immunity
|November 18, 2025
PubMed

Insights

Chlamydia trachomatis (C.t.) uses inclusion membrane (Inc) proteins like CpoS to manipulate host cell trafficking. CpoS self-oligomerizes and interacts with other Inc proteins and host GTPases, forming scaffolds essential for bacterial replication.

Area of Science:

  • Microbiology
  • Cell Biology
  • Infectious Diseases

Background:

  • Chlamydia trachomatis (C.t.) is a major bacterial cause of sexually transmitted infections.
  • C.t. replicates within a host-derived vacuole called the inclusion.
  • Inclusion membrane (Inc) proteins secreted by C.t. modify the inclusion and are crucial for infection.

Purpose of the Study:

  • To further characterize the Inc protein CpoS and its role in C.t. infection.
  • To elucidate the molecular mechanisms by which CpoS interacts with other Inc proteins and host factors.
  • To understand how C.t. manipulates vesicular trafficking for replication.

Main Methods:

  • Biochemical assays to study protein-protein interactions.
  • Biophysical analyses to determine protein structure and oligomerization.
  • GTPase binding assays to investigate host factor engagement.

Main Results:

  • CpoS directly binds to other coiled-coil region-containing Inc proteins.
  • CpoS engages Rab GTPases at a distinct site and facilitates Arf GTPase recruitment via InaC interaction.
  • Biophysical studies revealed CpoS forms tetrameric structures, similar to eukaryotic SNARE proteins, suggesting a scaffolding role.

Conclusions:

  • CpoS acts as a scaffold, mediating Inc-Inc and Inc-host factor interactions to orchestrate vesicle trafficking.
  • These interactions are critical for bacterial replication and inclusion development.
  • C.t. effectively hijacks host vesicular trafficking pathways through intricate manipulation of Inc proteins and host factors to sustain infection.

Keywords:
Chlamydia trachomatisCpoSInaCInc-Inc interactionsT3S

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