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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Prokaryotic symbionts of protists living in the intestine of wood eating cockroaches and termites
 Kubánková, Aneta ; Hampl, Vladimír (advisor) ; Rotterová, Johana (referee)
Termites and wood-eating cockroaches are worldwide successful especially because of their ability to digest lignocellulose efficiently. After a long period of coevolution a complex ecosystem of diverse microorganisms was established in their hindgut. A lot of lineages of flagellates live solely within this unique environment and it is impossible to cultivate them in vitro. As termites are unable to survive without their eukaryotic endosymbionts, also protists are strongly linked to prokaryotes colonizing their cytoplasm and cytoplasmic membrane. Numerous phyla of bacteria participate in nitrogen fixation and efficient nitrogen utilization, synthesis of amino acids, cofactors and vitamines. Some of them take part in the degradation of lignocellulose. Representatives of another domain of prokaryotes, Archea, are important in the final stages of lignocellulose fermentation, because they utilize the produced hydrogen gas in a process of methanogenesis. Large part of our knowledge about the composition and function of the termite gut biota was acquired thanks to metagenomic studies.
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Symbionti Arsenophonus a Sodalis v kloších: analogie k systému Wigglesworthia a Sodalis v mouchách tsetse
 ŠOCHOVÁ, Eva
This study provides a new comparative model of symbiosis in sheep ked to well-characterized tsetse fly symbiotic system. Distribution of symbiotic associates was revealed by transmission electron microscopy and their evolutionary origin was confirmed by reconstruction of their phylogenies. Using genomic data, it explores their metabolic contribution to host and sheds light on B-vitamin metabolism.
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RNA biology of symbiotic bacteria in insects
 MACHOVÁ, Kamila
Non-coding RNAs (ncRNAs) represent an important part of bacterial genomes. However, only few studies RNAs with limited sampling were done concerning ncRNAs of insect endosymbiontic bacteria. This study provides a broad in silico genome sampling of insect endosymbionts (63 lineages of 27 genera) for ncRNAs and their modifications. Most strikingly it was found out that i) genes encoding modification enzymes conserved in particular genomes differ to high extent, ii) most of tRNA and rRNA modifications sites are conserved regardless whether the gene encoding the corresponding modification enzyme is conserved, iii) multiple endosymbiont lineages do not encode a full set of tRNAs. Our data imply that translation of endosymbionts is much less efficient compared to phylogenetically related free-living bacteria and that some of symbionts possibly need to cooperate with their cosymbionts or maybe even with their host to maintain translation.
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