Molecular Adaptation of a Plant-Bacterium Outer Membrane Protease Towards Plague Virulence Factor Pla
Author Information
Author(s): Haiko Johanna, Laakkonen Liisa, Westerlund-Wikström Benita, Korhonen Timo K
Primary Institution: University of Helsinki
Hypothesis
How many substitutions are needed and at which locations in Epo to gain a proteolytic function (plasminogen activation) and a non-proteolytic function (invasiveness) expressed by Pla?
Conclusion
The study demonstrates how a protease from a plant pathogen can adapt to exhibit virulence functions associated with a human pathogen.
Supporting Evidence
- Pla and Epo are both functional endopeptidases but differ in their ability to activate plasminogen.
- Substitutions in specific loops of Epo can enhance its plasminogen activation capacity.
- Extensive substitutions are required to convert Epo into an effective invasin.
Takeaway
Scientists changed a few parts of a plant protein to see if it could help bacteria infect humans, and it worked a little bit!
Methodology
Site-specific mutagenesis was used to modify the Epo protein to exhibit functions of the Pla protein, followed by functional assays in E. coli.
Limitations
The study primarily focuses on in vitro assays, which may not fully represent in vivo conditions.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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