Mechanismus inducibilní genové exprese rezistenčního proteinu Vga(A)LC ze Staphylococcus haemolyticus
| Autor: | Novotná, Michaela |
|---|---|
| Jazyk: | čeština |
| Rok vydání: | 2021 |
| Předmět: |
antibiotic resistance
SRC VgaALC lincosamides pleuromutiliny ARE ABCF proteins Staphylococcus haemolyticus ARE ABCF proteiny regulation of gene expression pleuromutilins antibiotická rezistence streptogramins regulace genové exprese streptograminy ribozomem zprostředkovaná atenuace linkosamidy ribosome mediated attenuation r5'UTR element |
| Druh dokumentu: | masterThesis |
| Popis: | The staphylococcal protein VgaA belongs to ARE ABCF family, which confers resistance to ribosome binding antibiotics by the target protection mechanism. VgaA confers resistance to lincosamides, streptogramins A and pleuromutilins and thus provides the so-called LSAP resistance phenotype. The expression of resistance genes often reduces fitness in the absence of an antibiotic, therefore the expression of resistance genes is often tightly controlled and triggered only in response to the presence of an antibiotic to which the protein confers resistance. The inducible expression has also been observed for the vgaA gene, nevertheless, its mechanism has not been elucidated. In the diploma thesis, it was shown that the vgaALC gene from Staphylococcus haemolyticus is regulated by ribosome-mediated attenuation. The mechanism is based on the detection of translation inhibitors via a ribosome translating a special regulatory open reading frame (uORF), which is part of an attenuator located in the 5' untranslated region of the mRNA. The vgaALC gene is regulated at the transcriptional level in response to LSAP antibiotics. Antibiotic specificity of induction is affected not only by the nature of the peptide encoded by uORF but also by the antibiotic specificity of the resistance protein. Fluorescence microscopy... |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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