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Parageobacillus thermoglucosidasius TNO-09.020

ABSTRACT: Geobacillus thermoglucosidans TNO-09.020 Genome sequencing

PROVIDER: PRJNA81577 | ENA |

REPOSITORIES: ENA

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Functional characterization of the phosphotransferase system in Parageobacillus thermoglucosidasius.

Project description:Parageobacillus thermoglucosidasius is a thermophilic bacterium characterized by rapid growth, low nutrient requirements, and amenability to genetic manipulation. These characteristics along with its ability to ferment a broad range of carbohydrates make P. thermoglucosidasius a potential workhorse in whole-cell biocatalysis. The phosphoenolpyruvate:carbohydrate phosphotransferase system (PTS) catalyzes the transport and phosphorylation of carbohydrates and sugar derivatives in bacteria, making it important for their physiological characterization. In this study, the role of PTS elements on the catabolism of PTS and non-PTS substrates was investigated for P. thermoglucosidasius DSM 2542. Knockout of the common enzyme I, part of all PTSs, showed that arbutin, cellobiose, fructose, glucose, glycerol, mannitol, mannose, N-acetylglucosamine, N-acetylmuramic acid, sorbitol, salicin, sucrose, and trehalose were PTS-dependent on translocation and coupled to phosphorylation. The role of each putative PTS was investigated and six PTS-deletion variants could not grow on arbutin, mannitol, N-acetylglucosamine, sorbitol, and trehalose as the main carbon source, or showed diminished growth on N-acetylmuramic acid. We concluded that PTS is a pivotal factor in the sugar metabolism of P. thermoglucosidasius and established six PTS variants important for the translocation of specific carbohydrates. This study lays the groundwork for engineering efforts with P. thermoglucosidasius towards efficient utilization of diverse carbon substrates for whole-cell biocatalysis.

| S-EPMC10154347 | biostudies-literature

CO-dependent hydrogen production by the facultative anaerobe Parageobacillus thermoglucosidasius.

Project description:BACKGROUND:The overreliance on dwindling fossil fuel reserves and the negative climatic effects of using such fuels are driving the development of new clean energy sources. One such alternative source is hydrogen (H2), which can be generated from renewable sources. Parageobacillus thermoglucosidasius is a facultative anaerobic thermophilic bacterium which is frequently isolated from high temperature environments including hot springs and compost. RESULTS:Comparative genomics performed in the present study showed that P. thermoglucosidasius encodes two evolutionary distinct H2-uptake [Ni-Fe]-hydrogenases and one H2-evolving hydrogenases. In addition, genes encoding an anaerobic CO dehydrogenase (CODH) are co-localized with genes encoding a putative H2-evolving hydrogenase. The co-localized of CODH and uptake hydrogenase form an enzyme complex that might potentially be involved in catalyzing the water-gas shift reaction (CO + H2O ? CO2 + H2) in P. thermoglucosidasius. Cultivation of P. thermoglucosidasius DSM 2542T with an initial gas atmosphere of 50% CO and 50% air showed it to be capable of growth at elevated CO concentrations (50%). Furthermore, GC analyses showed that it was capable of producing hydrogen at an equimolar conversion with a final yield of 1.08 H2/CO. CONCLUSIONS:This study highlights the potential of the facultative anaerobic P. thermoglucosidasius DSM 2542T for developing new strategies for the biohydrogen production.

| S-EPMC6036681 | biostudies-literature

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