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Related Concept Videos

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Bacterial Translocation and Protein Secretion

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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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Related Experiment Video

Updated: Oct 29, 2025

Analysis of Yersinia enterocolitica Effector Translocation into Host Cells Using Beta-lactamase Effector Fusions
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Tracking bacterial effector protein delivery into host cells.

Timothy L Cover1,2,3

  • 1Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.

Molecular Microbiology
|July 12, 2021
PubMed
Summary

Researchers developed a split luciferase assay to track Helicobacter pylori Cag T4SS-mediated CagA protein delivery into gastric cells. This method enables real-time monitoring of CagA translocation, aiding cancer pathogenesis research.

Keywords:
bacterial secretion systemseffector proteinsmacromolecular protein complexesprotein translocation

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Split Green Fluorescent Protein System to Visualize Effectors Delivered from Bacteria During Infection
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Split Green Fluorescent Protein System to Visualize Effectors Delivered from Bacteria During Infection

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Area of Science:

  • Microbiology
  • Cell Biology
  • Cancer Research

Background:

  • Bacterial Type IV secretion systems (T4SSs) are crucial for delivering effector proteins into host cells.
  • The Helicobacter pylori Cag T4SS plays a significant role in gastric cancer pathogenesis by delivering the CagA effector protein.
  • Understanding CagA delivery mechanisms is vital for cancer research but has been limited by the lack of effective monitoring tools.

Purpose of the Study:

  • To develop and validate a novel split luciferase assay for monitoring T4SS-mediated translocation of CagA into host cells.
  • To facilitate real-time quantification and kinetic analysis of CagA delivery.
  • To investigate the role of protein unfolding in CagA secretion via the Cag T4SS.

Main Methods:

  • Development of a split luciferase reporter system to monitor CagA translocation.
  • Real-time assays to quantify CagA delivery into gastric cells.
  • Tracking of CagA fusion proteins to assess secretion requirements.

Main Results:

  • The split luciferase assay successfully monitored T4SS-mediated CagA translocation in real-time.
  • The assay allowed for the quantification of CagA delivery kinetics.
  • Protein unfolding was confirmed as important for secretion by the Cag T4SS.

Conclusions:

  • A split luciferase system provides a robust method for studying T4SS-mediated protein delivery.
  • This assay facilitates the analysis of bacterial effector protein secretion and translocation mechanisms.
  • The findings enhance our understanding of H. pylori pathogenesis and gastric cancer development.