Phospholipid Biosynthesis in Plant Systems
Summary
Phospholipid biosynthesis in plants centres on the coordinated assembly of glycerol backbones, fatty acyl chains and polar head groups to form the major membrane lipids phosphatidylcholine (PC) and phosphatidylethanolamine (PE). Two principal routes supply these head groups: the Kennedy pathway, in which choline or ethanolamine is sequentially phosphorylated and coupled to diacylglycerol via cytidylyltransferase and phosphotransferase steps; and the alternative CDP-diacylglycerol (CDP-DAG) pathway, which channels phosphatidic acid into phosphatidylglycerol and phosphatidylinositol. In plants, an additional branch converts serine directly to ethanolamine through a pyridoxal phosphate-dependent decarboxylase, feeding into PE synthesis without requiring membrane-bound phosphatidylserine decarboxylases. Fine-tuned regulation of lipid composition is achieved by enzymes such as phosphatidic acid phosphohydrolases, which modulate phosphatidic acid levels and thereby influence downstream cytidylyltransferase activity. Biosynthetic fluxes are spatially organised between endoplasmic reticulum, mitochondria and plastids, reflecting the distinct demands of cellular compartments. Phospholipid synthesis is essential not only for membrane biogenesis and vesicle trafficking but also for stress signalling and environmental adaptation. Advances in metabolic engineering aim to manipulate key enzymes in oilseed crops to enhance nutritional quality, abiotic stress tolerance and biomass yield by tailoring phospholipid profiles.
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Phospholipid Biosynthesis in Plant Systems publication trend
The graph below shows the total number of articles in phospholipid biosynthesis in plant systems across all publications each year (not limited to Nature Index journals).
Technical terms
Kennedy pathway: Series of enzymatic steps converting free choline or ethanolamine into CDP-activated head groups and then into phospholipids by transfer to diacylglycerol.
Serine decarboxylase (SDC): Pyridoxal phosphate-dependent enzyme catalysing direct conversion of serine to ethanolamine in the cytosol or mitochondria.
Phosphoethanolamine N-methyltransferase (PEAMT): Enzyme that methylates phosphoethanolamine to phosphocholine, using S-adenosylmethionine as the methyl donor.
Choline/ethanolamine kinase (CEK): Initiating enzyme of the Kennedy pathway that phosphorylates free choline or ethanolamine to form phosphomonoesters.
Phosphatidic acid (PA): Central lipid intermediate acting as a substrate for CDP-DAG synthesis and a regulator of key cytidylyltransferase activities.
References
- Plants Synthesize Ethanolamine by Direct Decarboxylation of Serine Using a Pyridoxal Phosphate Enzyme*. Journal of Biological Chemistry (2001).
- PHOSPHATIDIC ACID PHOSPHOHYDROLASE Regulates Phosphatidylcholine Biosynthesis in Arabidopsis by Phosphatidic Acid-Mediated Activation of CTP:PHOSPHOCHOLINE CYTIDYLYLTRANSFERASE Activity. The Plant Cell (2015).
- Functional Characterization of Phospholipid N-Methyltransferases from Arabidopsis and Soybean*. Journal of Biological Chemistry (2009).
- Arabidopsis Serine Decarboxylase 1 (SDC1) in Phospholipid and Amino Acid Metabolism. Frontiers in Plant Science (2018).
- BUMPY STEM Is an Arabidopsis Choline/Ethanolamine Kinase Required for Normal Development and Chilling Responses. Frontiers in Plant Science (2022).
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