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- W4387432918 abstract "SUMMARY The unsaturation of phospholipids influences the function of membranes. In Arabidopsis thaliana , the oleoyl Δ12‐desaturase FAD2 converts oleic (18:1 Δ9 ) to linoleic acid (18:2 Δ9,12 ) and influences phospholipid unsaturation in different cellular membranes. Despite its importance, the precise localization of Arabidopsis FAD2 has not been unambiguously described. As FAD2 is thought to modify phospholipid‐associated fatty acids at the endoplasmic reticulum (ER), from where unsaturates are distributed to other cellular sites, we hypothesized that FAD2 locates to ER subdomains enabling trafficking of lipid intermediates through the secretory pathway. Fluorescent FAD2 fusions used to test this hypothesis were first assessed for functionality by heterologous expression in yeast ( Saccharomyces cerevisiae ), and in planta by Arabidopsis fad2 mutant rescue upon ectopic expression from an intrinsic FAD2 promoter fragment. Light sheet fluorescence, laser scanning confocal or spinning disc microscopy of roots, leaves, or mesophyll protoplasts showed the functional fluorescence‐tagged FAD2 variants in flattened donut‐shaped structures of ~0.5–1 μm diameter, in a pattern not resembling mere ER association. High‐resolution imaging of coexpressed organellar markers showed fluorescence‐tagged FAD2 in a ring‐shaped pattern surrounding ER‐proximal Golgi particles, colocalizing with pre‐ cis ‐Golgi markers. This localization required the unusual C‐terminal retention signal of FAD2, and deletion or substitutions in this protein region resulted in relaxed distribution and diffuse association with the ER. The distinct association of FAD2 with pre‐ cis ‐Golgi stacks in Arabidopsis root and leaf tissue is consistent with a contribution of FAD2 to membrane lipid homeostasis through the secretory pathway, as verified by an increased plasma membrane liquid phase order in the fad2 mutant." @default.
- W4387432918 created "2023-10-09" @default.
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- W4387432918 date "2023-10-08" @default.
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- W4387432918 title "Association of the Arabidopsis oleoyl <scp>Δ12</scp>‐desaturase <scp>FAD2</scp> with <scp>pre‐</scp><i>cis</i><scp>‐Golgi</scp> stacks at <scp>endoplasmic reticulum‐Golgi</scp>‐exit sites" @default.
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- W4387432918 doi "https://doi.org/10.1111/tpj.16492" @default.
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