The liver fluke, Fasciola hepatica, is one of the most important parasites of livestock, and it also infects humans. The proteolytic system of trematodes is critical for their interaction with the host and is a potential target for the development of novel vaccines. This work is focused on proteases secreted by F. hepatica adults and on FheCy2, a new protease inhibitor from the cystatin family. The proteolytic activity of the secreted proteases was analyzed using: (a) chromogenic protein substrates and fluorogenic peptide substrates, (b) selective protease inhibitors, and (c) a fluorescent activity-based probe for visualization of proteases. The results showed that the secreted proteases are cysteine proteases of papain family belonging to cathepsins L and B. These proteases were effectivelly inhibited by FheCy2 as demonstrated by enzymological analysis. It can be assumed that FheCy2 participates in the physiological regulation of endogenous proteases secreted by F. hepatica adults, which makes it attractive candidate protein for vaccination studies. Key words: Fasciola hepatica, cathepsins, proteolytic activity, substrate specificity, protease inhibitors (In Czech)
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:324168 |
| Date | January 2013 |
| Creators | Buša, Michal |
| Contributors | Konvalinka, Jan, Ryšlavá, Helena |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
Page generated in 0.0418 seconds