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Metabolic Engineering of a Thermophilic Geobacillus for the Production of Renewable Chemicals
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Industrial Biotechnology.
2022 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

Det sker ett skift I samhället idag mot ett mer biobaserad produktion av olika industriella produkter. För att detta ska lyckas måste mikroorganismer användas vid denna produktion. En viktigt produkt som har gått igenom denna förändring är laktat, som idag produceras mest av mjölksyrabakterier. Dock finns det en annan grupp av bakterier som har en hög potential att användas inom detta område: termofila bakterier. Deras höga tillväxttemperatur minskar risken för kontamineringar i batcher och minskar kylningskostnader. En art i den gruppen som har visat sig vara lovande för framtida tillämpningar är Parageobacillus thermogluosidasius. Här presenteras uppbyggandet av en plasmid som innehåller en lämplig promoter för P. thermoglucosidasius tillsammans med genen för uttryck av laktatdehydrogenas (LDH) och en karakterisering av både vildtypens och den transformerad bakteriens konsumtion och produktion av olika metaboliter. Resultaten visar att även om den transformerade bakterien inte producerar mer laktat än vildtypen under tillväxttiden, verkar det som om produktionen blir högre ju mer cellkoncentrationen ökar och odlingen blir mer anaerob.

Abstract [en]

There is a shift happening in society today towards a more biobased production of different industrial products. To succeed in this shift, microorganisms must be employed. One important product that has gone through this shift is lactate, which is today produced mostly by lactic acid bacteria (LAB). However thermophilic bacteria also have a high potential to be used for the production of different products once they can be engineered, due to their high temperature diminishing risks of batch contaminations and reducing cooling costs. One species of bacteria in this group that has shown promise is Parageobacillus thermoglucosidasius. Here is presented the construction of a plasmid containing a suitable promoter for P. thermoglucosidasius along with the gene for expression of lactate dehydrogenase and a characterization of both the wild type’s and the transformed bacteria’s consumption and production of different metabolites. The results show that although the transformed bacteria did not produce more lactate than the wild type during the growth phase of the bacteria, there seems to be a higher production as the concentration of cells rise and the cultivation becomes less aerobic.

Place, publisher, year, edition, pages
2022.
Series
TRITA-CBH-GRU ; 2022:178
Keywords [en]
Parageobacillus, lactate dehydrogenase, thermophile, HPLC
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-314451OAI: oai:DiVA.org:kth-314451DiVA, id: diva2:1672890
Subject / course
Biotechnology
Educational program
Master of Science - Industrial and Environmental Biotechnology
Examiners
Available from: 2022-06-20 Created: 2022-06-20 Last updated: 2022-06-25

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