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J Infect Dis. 2015 May 1;211(9):1376-87. doi: 10.1093/infdis/jiu520. Epub 2014 Sep 17.

Fisetin inhibits Listeria monocytogenes virulence by interfering with the oligomerization of listeriolysin O.

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Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine.
Department of Food Quality and Safety, Jilin University, Changchun, China.


Listeriolysin O (LLO), an essential virulence determinant of Listeria monocytogenes, is a pore-forming toxin whose primary function is to facilitate cytosolic bacterial replication by breaching the phagosomal membranes, which is critical for the pathogen to evade host immune recognition. The critical role of LLO in the virulence of L. monocytogenes renders it an ideal target for designing novel antivirulence therapeutics. We found that fisetin, a natural flavonoid without antimicrobial activity, is a potent antagonist of LLO-mediated hemolysis. Fisetin effectively inhibits L. monocytogenes infection in both tissue culture and animal infection models. Molecular modeling and mutational analysis revealed that fisetin directly engages loop 2 and loop 3 of LLO, leading to the blockage of cholesterol binding and the reduction of its oligomerization, thus inhibiting its hemolytic activity. Our results establish fisetin as an effective antitoxin agent for LLO, which can be further developed into novel therapeutics against infections caused by L. monocytogenes.


anti-virulence; infection; molecular modeling; toxin

[Indexed for MEDLINE]

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