Related Experiment Videos
Specific binding of recombinant Listeria monocytogenes p60 protein to Caco-2 cells
1Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology, Yusong, P.O. Box 115, Taejon, South Korea.
Abstract:
The Listeria monocytogenes p60 is a major extracellular protein, which is believed to be involved in the invasion of these bacteria into their host cells. So far the mechanism by which p60 participates in the internalization or penetration of L. monocytogenes is still veiled. To determine the possibility of a direct interaction of p60 with the host cell surface, the iap gene was recombinantly expressed in Escherichia coli and used for binding studies with the enterocyte-like Caco-2 cells. Fluorescence activated flow cytometry and confocal laser scanning microscopy revealed a cell membrane specific staining with p60, which implications in Listeria virulence are discussed.
Insights
Listeria monocytogenes p60 protein directly binds to host cell membranes. This finding offers new insights into Listeria
Area of Science:
- Microbiology
- Cell Biology
- Bacterial Pathogenesis
Background:
- Listeria monocytogenes is an intracellular pathogen.
- The p60 protein is a key extracellular virulence factor.
- The mechanism of L. monocytogenes host cell invasion is not fully understood.
Purpose of the Study:
- To investigate the direct interaction between L. monocytogenes p60 protein and host cells.
- To elucidate the role of p60 in bacterial internalization.
Main Methods:
- Recombinant expression of the iap gene (encoding p60) in Escherichia coli.
- Binding assays using Caco-2 cells (enterocyte-like).
- Fluorescence-activated flow cytometry and confocal laser scanning microscopy.
Main Results:
- p60 protein specifically stained the cell membrane of Caco-2 cells.
- Demonstrated direct binding of p60 to the host cell surface.
Conclusions:
- The p60 protein directly interacts with host cell membranes.
- This interaction is a potential mechanism contributing to Listeria virulence and invasion.
- Further research is warranted to explore the implications for L. monocytogenes pathogenesis.