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A Visual Assay to Monitor T6SS-mediated Bacterial Competition

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Type III secretion systems shape up as they ship out.

Thomas C Marlovits¹, C Erec Stebbins

¹Research Institute of Molecular Pathology, Vienna, Austria.

Current Opinion in Microbiology

|December 18, 2009

Summary

Type III secretion systems (T3SSs) are bacterial virulence nanosyringes. This review highlights structural microbiology advances in understanding the conserved T3SS apparatus, crucial for Gram-negative pathogen virulence.

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Area of Science:

Microbiology
Structural Biology
Bacteriology

Background:

Type III secretion systems (T3SSs) are essential virulence factors in many Gram-negative bacterial pathogens.
These complex protein machines translocate effector proteins directly into host cells, altering host biology to the pathogen's advantage.
While T3SS substrates are well-studied, the secretion apparatus itself remains less understood.

Purpose of the Study:

To review recent advancements in structural microbiology concerning the T3SS apparatus.
To highlight the application of structural biology techniques to elucidate the conserved T3SS machinery.
To bridge the knowledge gap regarding the structure of this critical bacterial virulence system.

Main Methods:

Structural biology techniques (e.g., cryo-electron microscopy, X-ray crystallography).
Biochemical and biophysical analyses of T3SS components.
Comparative analysis across different bacterial species.

Main Results:

Recent structural studies have provided unprecedented insights into the architecture of the T3SS apparatus.
Key conserved components of the secretion machinery have been characterized at high resolution.
Understanding the structure facilitates mechanistic insights into protein translocation.

Conclusions:

Structural biology is increasingly vital for deciphering the complex T3SS.
Elucidating the T3SS apparatus structure is crucial for understanding bacterial pathogenesis.
This knowledge may pave the way for novel therapeutic strategies against bacterial infections.