N-terminus of seed caleosins is essential for lipid droplet sorting but not for lipid accumulation - Archive ouverte HAL Access content directly
Journal Articles Archives of Biochemistry and Biophysics Year : 2015

N-terminus of seed caleosins is essential for lipid droplet sorting but not for lipid accumulation

Abstract

Caleosin, a calcium-binding protein associated with plant lipid droplets, stimulates lipid accumulation when heterologously expressed in Saccharomyces cerevisiae. Accumulated lipids are stored in cytoplasmic lipid droplets that are stabilised by incorporated caleosin. We designed a set of mutants affecting putative crucial sites for caleosin function and association with lipid droplets, i.e. the N-terminus, the EF-hand motif and the proline-knot motif. We investigated the effect of introduced mutations on caleosin capacity to initiate lipid accumulation and on caleosin sorting within cell as well as on its association with lipid droplets. Our results strongly suggest that the N-terminal domain is essential for proper protein sorting and targeting to lipid droplets but not for enhancing lipid accumulation.
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hal-01536435 , version 1 (11-06-2017)

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Zita Purkrtova, Thierry Chardot, Marine Froissard. N-terminus of seed caleosins is essential for lipid droplet sorting but not for lipid accumulation. Archives of Biochemistry and Biophysics, 2015, 579, pp.47-54. ⟨10.1016/j.abb.2015.05.008⟩. ⟨hal-01536435⟩
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