title: Single cell synchrotron FT-IR microspectroscopy reveals a link between neutral lipid and storage carbohydrate fluxes in S. cerevisiae.
abstract: In most organisms, storage lipids are packaged into specialized structures called lipid droplets. These contain a core of neutral lipids surrounded by a monolayer of phospholipids, and various proteins which vary depending on the species. Hydrophobic structural proteins stabilize the interface between the lipid core and aqueous cellular environment (perilipin family of proteins, apolipoproteins, oleosins). We developed a genetic approach using heterologous expression in Saccharomyces cerevisiae of the Arabidopsis thaliana lipid droplet oleosin and caleosin proteins AtOle1 and AtClo1. These transformed yeasts overaccumulate lipid droplets, leading to a specific increase in storage lipids. The phenotype of these cells was explored using synchrotron FT-IR microspectroscopy to investigate the dynamics of lipid storage and cellular carbon fluxes reflected as changes in spectral fingerprints. Multivariate statistical analysis of the data showed a clear effect on storage carbohydrates and more specifically, a decrease in glycogen in our modified strains. These observations were confirmed by biochemical quantification of the storage carbohydrates glycogen and trehalose. Our results demonstrate that neutral lipid and storage carbohydrate fluxes are tightly connected and co-regulated.
authors.affiliation: INRA, UAR 1008, CEPIA, Nantes, France ; Synchrotron SOLEIL, Gif-sur-yvette, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Jamme
authors.forename: Jean-David
authors.initials: JD
authors.lastname: Vindigni
authors.forename: Valérie
authors.initials: V
authors.lastname: Méchin
authors.forename: Tamazight
authors.initials: T
authors.lastname: Cherifi
authors.forename: Thierry
authors.initials: T
authors.lastname: Chardot
authors.forename: Marine
authors.initials: M
authors.lastname: Froissard
mesh_terms: D017360:Arabidopsis / Q000737:chemistry*; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002135:Calcium-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D006003:Glycogen / Q000378:metabolism; D008055:Lipids / Q000737:chemistry*; D015999:Multivariate Analysis; D015388:Organelles / Q000737:chemistry / Q000378:metabolism* / Q000648:ultrastructure; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000737:chemistry / Q000378:metabolism* / Q000648:ultrastructure; D059010:Single-Cell Analysis; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D017356:Synchrotrons; D014199:Trehalose / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D002135:Calcium-Binding Proteins; D008055:Lipids; D010940:Plant Proteins; C402836:caleosin protein, Sesamum indicum; C079353:oleosin protein, Arabidopsis; D006003:Glycogen; D014199:Trehalose
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