Mycosporine-glutamicol-glucoside: a natural UV-absorbing secondary metabolite of rock-inhabiting microcolonial fungi |
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Authors: | Volkmann Marc Whitehead Kenia Rütters Heike Rullkötter Jürgen Gorbushina Anna A |
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Institution: | Institute of Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University Oldenburg, PO Box 2503, 26111 Oldenburg, Germany. marc.volkmann@uni-oldenburg.de |
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Abstract: | Microcolonial ascomycetes are known to inhabit bare rock surfaces in cold and hot deserts and thus are habitually exposed to high levels of solar radiation. Several of these stress-tolerant fungal isolates, cultivated in the laboratory under daylight illumination, were studied for the presence of effective UV-radiation protection substances. Liquid chromatography/mass spectrometry (LC/MS) and liquid chromatography/tandem mass spectrometry (LC/MS/MS) analyses allowed for efficient separation and structure clarification of two mycosporines. It was demonstrated that both mycosporine-glutamicol-glucoside and mycosporine-glutaminol-glucoside are natural and constitutive secondary metabolites of microcolonial fungi. The function and relation of these substances in the fungal cell are discussed. |
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