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Metabolomic response of a marine bacterium to 3,6-anhydro-L-galactose, the rare sugar from red macroalgae, as the sole carbon source

Authors
Yun, Eun JuYu, SoraKim, SooahKim, Kyoung Heon
Issue Date
20-3월-2018
Publisher
ELSEVIER SCIENCE BV
Keywords
3,6-Anhydro-L-galactose; Red macroalgae; Metabolomics; Vibrio sp strain EJY3
Citation
JOURNAL OF BIOTECHNOLOGY, v.270, pp.12 - 20
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF BIOTECHNOLOGY
Volume
270
Start Page
12
End Page
20
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/76702
DOI
10.1016/j.jbiotec.2018.01.017
ISSN
0168-1656
Abstract
Marine red macroalgae have received much attention as sustainable resources for producing bio-based products. Therefore, understanding the metabolic pathways of carbohydrates from red macroalgae, in fermentative microorganisms, is crucial for efficient bioconversion of the carbohydrates into bio-based products. Recently, the novel catabolic pathway of 3,6-anhydro-L-galactose (AHG), the main component of red macroalgae, was discovered in a marine bacterium, Vibrio sp. strain EJY3. However, the global metabolic network in response to AHG remains unclear. Here, the intracellular metabolites of EJY3 grown on AHG, glucose, or galactose were comparatively profiled using gas chromatography/time-of-flight mass spectrometry. The global metabolite profiling results revealed that the metabolic profile for AHG significantly differed from those for other common sugars. Specifically, the metabolic intermediate of the AHG pathway, 3,6-anhydrogalactonate, was detected during growth only in the presence of AHG; thus, the recently discovered key steps in AHG catabolism was found not to occur in the catabolism of other common sugars. Moreover, the levels of metabolic intermediates related to glycerolipid metabolism and valine biosynthesis were higher with AHG than those with other sugars. These comprehensive metabolomic analytical results for AHG in this marine bacterium can be used as the basis for having fermentative microbial strains to engineered to efficiently utilize AHG from macroalgal biomass.
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