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Related Concept Videos

Membrane Lipids01:32

Membrane Lipids

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
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Membrane Domains01:18

Membrane Domains

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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Asymmetric Lipid Bilayer01:35

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Phosphoinositides and PIPs01:42

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
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Lysosomes01:31

Lysosomes

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Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
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Synthesis of Phosphatidylcholine in the ER Membrane01:27

Synthesis of Phosphatidylcholine in the ER Membrane

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The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
The major components of all eukaryotic cell...
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Updated: May 20, 2025

A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
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Plant sphingolipids: Subcellular distributions and functions.

Chang Yang1, Yin-Ming Lai1, Nan Yao1

  • 1Guangdong Provincial Key Laboratory of Plant Stress Biology and State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, PR China.

Current Opinion in Plant Biology
|March 23, 2025
PubMed
Summary
This summary is machine-generated.

Plant sphingolipids are key membrane components with diverse roles. This review details their specific functions across subcellular locations in Arabidopsis, highlighting roles in membrane integrity and signaling pathways.

Keywords:
Membrane componentPlant lipidsSignalingSphingolipidsSubcellular distribution

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Area of Science:

  • Plant Cell Biology
  • Lipid Biochemistry

Background:

  • Sphingolipids are essential membrane components vital for structural integrity and cellular signaling.
  • Their distribution and functions vary significantly across different organelles and subcellular compartments.
  • Understanding these localized roles is crucial for comprehending plant cell physiology.

Purpose of the Study:

  • To review the sphingolipidomes of various subcellular structures in Arabidopsis thaliana cells.
  • To provide a detailed account of the functions of specific sphingolipids at each cellular location.
  • To offer a broad perspective on the multifaceted roles of plant sphingolipids.

Main Methods:

  • Literature review and synthesis of existing research on plant sphingolipid localization and function.
  • Comparative analysis of sphingolipid profiles across different subcellular compartments.
  • Functional annotation of sphingolipids based on experimental evidence.

Main Results:

  • Glycosphingolipids (e.g., glucosylceramide, glycosyl inositol phosphoceramide) are primarily involved in membrane functions.
  • Simple sphingolipids (e.g., free long-chain bases, ceramide) exhibit signaling roles in the plasma membrane, mitochondria, and nucleus.
  • Specific sphingolipids play distinct roles during plant stress responses and programmed cell death.

Conclusions:

  • Sphingolipid distribution is non-uniform across subcellular compartments, reflecting specialized functions.
  • Plant sphingolipids are critical for maintaining membrane integrity and mediating signaling pathways in response to environmental cues.
  • This review consolidates current knowledge, providing insights into the compartmentalized functions of sphingolipids in plants.