Related Experiment Video
Updated: Aug 16, 2025

Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling
Published on: June 25, 2015
A bacterial virulence factor interacts with the splicing factor RBM5 and stimulates formation of nuclear RBM5
Renaud Pourpre1, Goran Lakisic1, Emma Desgranges1
1Université Paris-Saclay, INRAE, Micalis Institute, EpiMic Lab, Jouy-en-Josas, AgroParisTech, France.
The internalin protein P (InlP) from Listeria monocytogenes targets the host cell nucleus. It alters nuclear speckle organization and interacts with the splicing factor RBM5, influencing cell death and granule formation.
Area of Science:
- Microbiology
- Cell Biology
- Molecular Biology
Background:
- Listeria monocytogenes is a foodborne pathogen causing listeriosis.
- Internalins are key virulence factors, with InlP implicated in placental infection.
- The role of InlP in host cell nucleus organization was previously unknown.
Purpose of the Study:
- To investigate the function of InlP in mammalian cell nucleus organization.
- To identify nuclear targets of InlP.
- To understand how L. monocytogenes manipulates host cell machinery.
Main Methods:
- Ectopic expression of InlP in human cells.
- Yeast two-hybrid screening.
- Immunoprecipitation and pull-down assays.
- Microscopy to observe nuclear speckles and granules.
Main Results:
- InlP translocates to the nucleus and modifies nuclear speckles.
- RBM5, a tumor suppressor and splicing factor, was identified as a major nuclear target of InlP.
- InlP inhibits RBM5-induced cell death and promotes RBM5-induced nuclear granule formation.
Conclusions:
- InlP functions as a nucleomodulin, controlling RBM5 compartmentalization and activity within the nucleus.
- L. monocytogenes possesses a mechanism to target and manipulate the host cell splicing machinery via InlP.
More Related Videos
11:33Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
Published on: December 17, 2013
09:13Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy
Published on: November 1, 2011
Related Concept Videos
Regulation of Nuclear Protein Sorting
Intracellular Movement of Viruses and Bacteria
Bacterial Translocation and Protein Secretion
Coordination of Gene Expression Processes in Bacteria
Leaky Scanning
RNA Splicing