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Probing the Biogenesis of Polysaccharide Granules in Algal Cells at Sub-Organellar Resolution via Raman Microscopy with Stable Isotope Labeling

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Title: Probing the Biogenesis of Polysaccharide Granules in Algal Cells at Sub-Organellar Resolution via Raman Microscopy with Stable Isotope Labeling
Authors: Yonamine, Yusuke Browse this author →KAKEN DB
Asai, Takuya Browse this author
Suzuki, Yuta Browse this author
Ito, Takuro Browse this author
Ozeki, Yasuyuki Browse this author
Hoshino, Yu Browse this author
Issue Date: 21-Dec-2021
Publisher: American Chemical Society
Journal Title: Analytical chemistry
Volume: 93
Issue: 50
Start Page: 16796
End Page: 16803
Publisher DOI: 10.1021/acs.analchem.1c03216
Abstract: Phototrophs assimilate CO2 into organic compounds that accumulate in storage organelles. Elucidation of the carbon dynamics of storage organelles could enhance the production efficiency of valuable compounds and facilitate the screening of strains with high photosynthetic activity. To comprehensively elucidate the carbon dynamics of these organelles, the intraorganellar distribution of the carbon atoms that accumulate at specific time periods should be probed. In this study, the biosynthesis of polysaccharides in storage organdies was spatiotemporally probed via stimulated Raman scattering (SRS) microscopy using a stable isotope (C-13) as the tracking probe. Paramylon granules (a storage organelle of beta-1,3-glucan) accumulated in a unicellular photosynthetic alga, Euglena gracilis, were investigated as a model organelle. The carbon source of the culture medium was switched from NaH12CO3 to NaH13CO3 during the production of the paramylon granules; this resulted in the distribution of the C-12 and C-13 constituents in the granules, so that the biosynthetic process could be tracked. Taking advantage of high-resolution SRS imaging and label switching, the localization of the C-12 and C-13 constituents inside a single paramylon granule could be visualized in three dimensions, thus revealing the growth process of paramylon granules. We propose that this method can be used for comprehensive elucidation of the dynamic activities of storage organelles.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Analytical Chemistry, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 与那嶺 雄介

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