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Plant Signal Behav. 2013 Nov;8(11):e27141. doi: 10.4161/psb.27141. Epub 2013 Dec 4.

Lipid droplet-associated proteins (LDAPs) are involved in the compartmentalization of lipophilic compounds in plant cells.

Author information

1
Department of Molecular and Cellular Biology; University of Guelph; Guelph, ON Canada.
2
Department of Biochemistry and Molecular Biology; University of Nevada; Reno, NV USA.
3
Department of Biological Sciences; East Tennessee State University; Johnson City, TN USA.
4
CNRS and University of Bordeaux; UMR5200 LBM; BP81; Villenave d'Ornon cedex, France.
5
USDA-ARS; US Arid-Land Agricultural Research Center; Maricopa, AZ USA.
6
Department of Biological Sciences; Center for Plant Lipid Research; University of North Texas; Denton, TX USA.
7
Department of Plant Biology; Michigan State University; East Lansing, MI USA.

Abstract

While lipid droplets have traditionally been considered as inert sites for the storage of triacylglycerols and sterol esters, they are now recognized as dynamic and functionally diverse organelles involved in energy homeostasis, lipid signaling, and stress responses. Unlike most other organelles, lipid droplets are delineated by a half-unit membrane whose protein constituents are poorly understood, except in the specialized case of oleosins, which are associated with seed lipid droplets. Recently, we identified a new class of lipid-droplet associated proteins called LDAPs that localize specifically to the lipid droplet surface within plant cells and share extensive sequence similarity with the small rubber particle proteins (SRPPs) found in rubber-accumulating plants. Here, we provide additional evidence for a role of LDAPs in lipid accumulation in oil-rich fruit tissues, and further explore the functional relationships between LDAPs and SRPPs. In addition, we propose that the larger LDAP/SRPP protein family plays important roles in the compartmentalization of lipophilic compounds, including triacylglycerols and polyisoprenoids, into lipid droplets within plant cells. Potential roles in lipid droplet biogenesis and function of these proteins also are discussed.

KEYWORDS:

Arabidopsis; Hevea brasiliensis; avocado; guayule; lipid droplet; lipophilic; oil palm; polyisoprenoids; small rubber particle proteins; triacylglycerol

PMID:
24305619
PMCID:
PMC4091607
DOI:
10.4161/psb.27141
[Indexed for MEDLINE]
Free PMC Article

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