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Gram-negative Bacterial Protein Secretion Systems

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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...

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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: May 9, 2026

A Visual Assay to Monitor T6SS-mediated Bacterial Competition

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Published on: March 20, 2013

Molecular insights into type I secretion systems.

Michael H H Lenders, Sven Reimann, Sander H J Smits

Biological Chemistry

|July 9, 2013

Summary

Type 1 secretion systems in Gram-negative bacteria transport diverse proteins across cell membranes. This review details the translocator components, focusing on structural and functional data for this essential bacterial machinery.

Area of Science:

Microbiology
Molecular Biology
Biochemistry

Background:

Type 1 secretion systems (T1SS) are crucial for Gram-negative bacteria, enabling direct transport of various substrates from cytoplasm to extracellular space.
Substrates secreted via T1SS often feature a C-terminal signal and calcium-binding GG repeats, accommodating proteins up to 900 kDa.

Purpose of the Study:

To provide a comprehensive overview of the Type 1 secretion system translocator.
To summarize current structural and functional data on T1SS components.

Main Methods:

Review of existing literature on Type 1 secretion systems.
Analysis of structural and functional data related to T1SS components.

Main Results:

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Last Updated: May 9, 2026

A Visual Assay to Monitor T6SS-mediated Bacterial Competition

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Super-Resolution Imaging of Bacterial Secreted Proteins Using Genetic Code Expansion

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The T1SS translocator comprises an outer membrane protein pore, a periplasmic membrane fusion protein, and an inner membrane ATP-binding cassette transporter.

The ATP-binding cassette transporter energizes the secretion process through the inner membrane.

Conclusions:

Understanding the T1SS translocator's structure and function is key to deciphering bacterial secretion mechanisms.
This review consolidates knowledge on T1SS components, highlighting their roles in protein transport.