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Type II secretion system in the mitochondria of Naegleria gruberi.
Krupičková, Alžběta ; Doležal, Pavel (advisor) ; Hampl, Vladimír (referee)
Several types of the transport (secretion) systems can be found in the membranes of gram-negative bacteria. These systems export proteins into the extracellular milieu of bacteria. One of them, type II secretion system (T2SS), exports the folded proteins through the outer bacterial membrane. The core subunits of T2SS were discovered in the genomes of several protists belonging to the Discoba and Malawimonada groups, including Naegleria gruberi and Malawimonas sp. str. 249. Our experiments suggest that these subunits are localized in the mitochondria of these protists. The discovery of these genes in eukaryotes is surprising. If the T2SS was active in these mitochondria, it would represent an evolutionary intermediate stage of the organelle, which can export and import the proteins. In experimental part of the thesis, we studied how the proteins of N. gruberi and M. sp. str. 249 interact. We demonstrated several interactions, which correspond to the function of bacterial T2SS. To this aim, we employed bacterial and yeast two-hybrid systems. Further, we explored the import of the core subunit of T2SS, pseudopilin, of N. gruberi into the inner mitochondrial membrane. And we also investigated the import of M. sp. str. 249 secretin into the outer mitochondrial membrane.
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Type II secretion system in the mitochondria of Naegleria gruberi.
Krupičková, Alžběta ; Doležal, Pavel (advisor) ; Hampl, Vladimír (referee)
Several types of the transport (secretion) systems can be found in the membranes of gram-negative bacteria. These systems export proteins into the extracellular milieu of bacteria. One of them, type II secretion system (T2SS), exports the folded proteins through the outer bacterial membrane. The core subunits of T2SS were discovered in the genomes of several protists belonging to the Discoba and Malawimonada groups, including Naegleria gruberi and Malawimonas sp. str. 249. Our experiments suggest that these subunits are localized in the mitochondria of these protists. The discovery of these genes in eukaryotes is surprising. If the T2SS was active in these mitochondria, it would represent an evolutionary intermediate stage of the organelle, which can export and import the proteins. In experimental part of the thesis, we studied how the proteins of N. gruberi and M. sp. str. 249 interact. We demonstrated several interactions, which correspond to the function of bacterial T2SS. To this aim, we employed bacterial and yeast two-hybrid systems. Further, we explored the import of the core subunit of T2SS, pseudopilin, of N. gruberi into the inner mitochondrial membrane. And we also investigated the import of M. sp. str. 249 secretin into the outer mitochondrial membrane.
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Parasite's life within the host cell.
Krupičková, Alžběta ; Doležal, Pavel (advisor) ; Štáfková, Jitka (referee)
Plasmodium falciparum is one of the most dangerous human intracellular single-celled pathogen. This thesis describes the invasion, the survival and the egress of the pathogen from the host cell (erythrocyte). The main topic of the thesis is the parasite's life within the host cell in a newly created compartment, parasitophorous vacuole. By exploding hundreds of proteins Plasmodium falciparum establishes number of unique modifications inside as well as on the surface of the host cell. The thesis finishes with the chapter on the therapy and possible development of new drugs and the chapter on the parasite evolution. Powered by TCPDF (www.tcpdf.org)
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