Proteogenomics of marine polysaccharide utilisation
Dissertation, Mathematisch-Naturwissenschaftliche Fakultät der Universität Greifswald, 2020
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Greifswald
Juli 2020
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Tag hinzufügen | Zusammenfassung: | Dissertation, Mathematisch-Naturwissenschaftliche Fakultät der Universität Greifswald, 2020 Metagenomik, Mikrobiologie, Polysaccharide, Metagenomics, Microbial ecology, Microbiology Polysaccharide is a major constituent of the total organic carbon that is generated by photosynthetic eukaryotes. In the marine realm, where approximately half of annual global carbon fixation occurs, algae can produce large amounts of polysaccharide during bloom events. Phytoplankton blooms are frequently seasonal phenomena, and spring blooms in particular have been a focus of study as they are predictable in space and time. This makes them much more amenable model systems in which to explore the processes that occur as organic carbon is recycled. It is assumed that the bulk of the polysaccharides algae produce serve one of two primary functions - namely acting as an energy storage molecule, or they serve as structural polymers in the cell walls. Other polysaccharides may also have protective functions as exudates. Regardless of function in algae, the polysaccharides are a valuable energy source for heterotrophic bacteria. The combination of abundance and predictable or semi-predictable structure of the polysaccharides has led to proliferation of variations on a particular sequestration and degradation strategy among the Bacteroidetes and Gammaproteobacteria that is frequently characterised as being ‘selfish’. The strategy is based on uptake of poly- and especially oligosaccharides into the periplasm via the use of TonB-dependent transporters. Once in the periplasmic space, oligomers can be further degraded to monomers that can then be transported into the cytosol. This ... |
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| Beschreibung: | xii, 343 Seiten Illustrationen (farbig), Diagramme (teilweise farbig), Karten (farbig) |