The eINTACT method for studying nuclear changes in host plant cells targeted by bacterial effectors in native...

Area of Science:

• Plant pathology
• Molecular biology
• Cell biology

Background:

• Type-III effector proteins are key virulence factors used by gram-negative bacteria to manipulate host cells.
• Isolating effector-targeted plant cells from infected tissues is challenging due to their underrepresentation and embedded nature.

Purpose of the Study:

• To describe a novel protocol, effector-inducible isolation of nuclei tagged in specific cell types (eINTACT), for isolating nuclei from plant cells targeted by bacterial effectors.
• To enable focused studies of effector-induced cellular and nuclear changes in host plants.

Main Methods:

• The eINTACT method utilizes biotin-labeled nuclei and streptavidin-coated magnetic beads for affinity-based purification.
• The protocol involves generating eINTACT transgenic lines and compatible bacterial mutants.
• Purification of nuclei from effector-recipient cells in infected plant tissues.

Main Results:

• eINTACT successfully isolates high-quality nuclei from bacterial effector-targeted host cells within their native infection context.
• Differential analysis of purified nuclei reveals effector-dependent nuclear changes.
• The entire infection experiment and nuclei isolation process can be completed within 5 days and 4 hours, respectively.

Conclusions:

• eINTACT is a unique and adaptable method for studying type-III effectors from various gram-negative bacteria in host plants.
• This technique overcomes the challenges of isolating specific cell types for studying bacterial-host interactions.
• eINTACT facilitates a deeper understanding of effector functions and host responses in plant infections.