Game of Trans-Kingdom Effectors

Area of Science:

• Microbiology
• Cell Biology
• Biochemistry

Background:

• Pseudomonas aeruginosa is an opportunistic pathogen.
• Type VI secretion systems (TSS) are crucial for bacterial virulence.
• Trans-kingdom effectors mediate inter-domain interactions.

Purpose of the Study:

• To characterize TplE as a novel trans-kingdom effector of P. aeruginosa.
• To investigate the molecular mechanisms underlying TplE's functions.
• To elucidate TplE's role in bacterial competition and host cell manipulation.

Main Methods:

• Genetic manipulation of P. aeruginosa strains.
• Biochemical assays to determine TplE's enzymatic activity.
• Cell-based assays using epithelial cells and bacterial co-cultures.
• Confocal microscopy to track TplE localization.

Main Results:

• TplE is a (phospho)lipase secreted via T6SS.
• TplE exhibits potent antibacterial activity against competing bacteria.
• TplE localizes to the endoplasmic reticulum in epithelial cells.
• TplE induces autophagy in host epithelial cells.

Conclusions:

• TplE is a multifunctional trans-kingdom effector.
• TplE contributes to P. aeruginosa pathogenesis by inhibiting competitors and modulating host responses.
• TplE represents a potential therapeutic target for P. aeruginosa infections.