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Identification of type III secretion effectors in Aeromonas spp.
Jirsová, Anežka ; Kamanová, Jana (advisor) ; Lišková, Petra (referee)
Bacteria of the genus Aeromonas are Gram-negative, rod-shaped bacteria that are ubiquitous in the aquatic environment. The mesophilic species of this genus, represented by A. hydrophila, A. dhakensis, A. veronii and A. schubertii, are not only important pathogens in fish but also emerging pathogens in humans. They are associated with various gastrointestinal, systemic and wound infections. Their virulence has been described as multifactorial and associated with the presence of a type 3 secretion system. However, not much is known about the effector proteins that are introduced into the host cell by this system. The aim of this work was to characterize the two different type 3 secretion systems API-1 and API-2 of A. schubertii with respect to their cellular cytotoxicity and to identify the effector proteins that they transport into the host cell. To achieve these goals, a variety of methods were used, including microbiological techniques, molecular cloning, tissue culture techniques, SDS polyacrylamide gel electrophoresis, and mass spectrometry. Successful construction of mutant strains of A. schubertii with inactivated API-1 or API-2 and a strain with deletion of the gene encoding the negative regulator of API-1 enabled me to identify potential type 3 effector proteins of this species. Among the...
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