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- Hatti-Kaul, Rajni, et al.
(författare)
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Extremophiles : A promising source of novel natural products
- 2020
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Ingår i: Biotechnological Applications of Extremophilic Microorganisms. - : De Gruyter. - 2197-9235 .- 2197-9227. - 9783110427738 - 9783110424331 ; 6, s. 1-42
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Bokkapitel (refereegranskat)abstract
- Extremophiles, the microorganisms inhabiting different extreme environments char-acterized by high or low temperature, high or low pH, high salt concentration, high pressure, high radiation, etc. or combinations thereof, have developed unique strate-gies for adapting and thriving in such environments. Studies on extremophiles have been pursued with great interest to determine the mechanisms of adaptation and also as an important source of useful products including enzymes, polymers, com-patible solutes, etc. During the last 20–30 years, attention has been directed toward search for novel bioactive compounds produced by extremophiles, which most likely are playing a role in controlling microbial population in the respective ecological niches and are also promising candidates for applications in foods and healthcare. Secondary metabolites produced by microbes have long been a major source of natural products for drug development. Toward the end of the last century, however, high rates of rediscovery of bioactive products from nature prompted a shift to high-throughput screening programs based on molecular targets and combinatorial chemistry, which has unfortunately not led to major discoveries of novel products, and the trend is now to build focused libraries around the chemical scaffolds of natural products. An urgent need for new molecules that could potentially replace the present-day antibiotics, which are becoming ineffective due to the resistance devel-oped by the pathogens, has served as an important driver for the increasing efforts on mining the unexplored ecological niches for bioactive compounds.
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- Nordberg Karlsson, Eva, et al.
(författare)
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Metabolic engineering of thermophilic bacteria for production of biotechnologically interesting compounds
- 2020
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Ingår i: Biotechnological applications of extremophilic microorganisms. - : De Gruyter. - 9783110424331 ; , s. 73-96
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Bokkapitel (refereegranskat)abstract
- Many thermophilic bacteria are efficient biomass degraders (producing polysaccharide degrading enzymes and utilizing a great variety of substrates, e.g. lignocellulosic polymers, pentoses, hexoses, as well sugar acids, and sugar alcohols). This makes them interesting organisms as potential cell factories in a circular bioeconomy. Lignocellulosic and marine macroalgal biomasses are regarded as sustainable biorefinery feedstocks for the production of energy carriers and platform and specialty chemicals, thereby meeting impending fossil fuel shortage and counteracting accumulation of greenhouse gasses. However, progress in using thermophilic bacteria that utilize these feedstocks as carbon sources has been hampered by the lack of suitable engineering tools to improve the production profiles of interesting target metabolites as specific synthetic production pathways need to be inserted/modified or existing pathways optimized by metabolic engineering. In this chapter, we review the progress on the use of thermophilic bacteria in metabolic engineering and the available engineering tools and give examples of species for which successful engineering has been accomplished. Today, the majority of thermophilic bacteria targeted for production of compounds of industrial interest by metabolic engineering belong to the phylum Firmicutes (e.g. Thermoanaerobacterium, Caldocellulosiruptor, Geobacillus, and Bacillus), taking advantage of anaerobic catabolic pathways producing organic acids and alcohols. However, there are additional and aerobic species gaining interest concerning biomass degradation and the ability of carbon dioxide fixation as well as production of molecules of interest, and some examples of this are also given.
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- Rehamnia, Baraa, et al.
(författare)
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Biotechnological potential of tardigrades
- 2020
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Ingår i: Biotechnological Applications of Extremophilic Microorganisms. - : Walter de Gruyter. - 9783110427738 - 9783110424331 - 9783110424362 ; , s. 357-390
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Bokkapitel (refereegranskat)
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