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Title: Metabolic and functional connections between cytoplasmic and chloroplast triacylglycerol storage

Journal Article · · Progress in Lipid Research
 [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)

Neutral lipids in the form of triacylglycerol (TAG) have emerged as critical regulators of cellular energy balance, lipid homeostasis, growth, development and stress response in organisms ranging from plants to yeast. Although TAGs are mostly recognized as the main storage component in cytoplasmic lipid droplets (LDs), TAG-rich LDs with similar structural and functional characteristics to those found in the cytoplasm also exist in chloroplasts of microalgae and higher plants. Chloroplasts contain up to 70% of total lipids in photosynthetic cells, yet how organisms maintain chloroplast lipid homeostasis remains an under-investigated area of research. In this work, we summarize the current state of knowledge about the metabolism of TAG and its function in chloroplasts, with a focus on the enzymes catalyzing the final steps of TAG assembly and the role of TAG synthesis in protection against lipotoxicity. We also discuss emerging data regarding connections between cytoplasmic and chloroplast TAG metabolism and the role of autophagy in the degradation of chloroplast storage lipids.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0012704; SC0018420
OSTI ID:
1706607
Alternate ID(s):
OSTI ID: 1776418
Report Number(s):
BNL-220580-2020-JAAM
Journal Information:
Progress in Lipid Research, Vol. 80; ISSN 0163-7827
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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