Corynebacterium glutamicum is a Gram-positive non-sporulating soil bacterium which is used in biotechnology as a producer of amino acids, nucleotides, biofuels and alcohols. The aim of this thesis was to create a hybrid σ factor of RNA polymerase which would be able to recognize a matching hybrid promoter without effect on expression of the host genes. Based on the σD and σH amino acid sequence, two types of hybrid factors, σDH and σHD , were designed by the sequence combination of sigD and sigH. As an alternative approach, based on the in silico homology modeling, mutations of wild-type σH in the region recognizing the -35 promoter element of the σH -dependent promoter were introduced. Hybrid promoters were constructed by combining the -35 and -10 promoter regions that were derived from the σD - and σH - dependent promoters. Promoter activity was determined by using gfpuv reporter gene under the control of hybrid promoter. The expression of gfpuv in strains with hybrid sigma factors σDH / σHD and hybrid promoters was rather low compared to strains that carried wild-type σ factor and the respective promoter. The aim of the thesis was achieved by using one of the mutant σH factor (σmutH_6A ) with alterations in the region recognizing the -35 element of the σH -dependent promoter. This mutant σ...
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:404319 |
| Date | January 2019 |
| Creators | Blumenstein, Jan |
| Contributors | Štěpánek, Václav, Krásný, Libor |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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