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Related Concept Videos

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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Membrane Asymmetry Regulating Transporters01:19

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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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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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Synthesis of Phosphatidylcholine in the ER Membrane01:27

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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.
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Lipids as Anchors01:32

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Related Experiment Video

Updated: Feb 28, 2026

Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
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Phospholipid transfer proteins revisited

K W Wirtz1

  • 1Institute of Biomembranes, Centre for Biomembranes and Lipid Enzymology, Utrecht University, P.O. Box 80054, 3508 TB Utrecht, The Netherlands.

The Biochemical Journal
|June 1, 1997
PubMed
Summary
This summary is machine-generated.

Phosphatidylinositol transfer protein (PI-TP) regulates vesicle flow by influencing lipid synthesis in yeast and mammalian cells. Non-specific lipid transfer protein (nsL-TP) is involved in fatty acid beta-oxidation in peroxisomes.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Intracellular lipid-binding proteins include Phosphatidylinositol transfer protein (PI-TP) and non-specific lipid transfer protein (nsL-TP).
  • While exhibiting similar in vitro phospholipid transfer activity, PI-TP and nsL-TP have distinct cellular functions.
  • These proteins are crucial mediators linking lipid metabolism to cellular processes.

Purpose of the Study:

  • To elucidate the differential functions of PI-TP and nsL-TP in cellular processes.
  • To investigate the role of PI-TP in vesicle trafficking and lipid biosynthesis.
  • To determine the function of nsL-TP in peroxisomal lipid metabolism.

Main Methods:

  • Comparative analysis of PI-TP and nsL-TP activities in yeast and mammalian cell models.
  • Investigation of PI-TP's role in Golgi phosphatidylcholine (PC) and phosphatidylinositol 4,5-bisphosphate (PIP2) synthesis.
  • Characterization of nsL-TP's interaction with fatty acyl-CoAs and its role in beta-oxidation.

Main Results:

  • PI-TP is essential for vesicle budding and fusion, regulating Golgi PI/PC ratio in yeast and stimulating PIP2 synthesis in mammalian cells.
  • PI-TP's activity may be linked to receptor-controlled phospholipase C activity.
  • nsL-TP, a peroxisomal protein, likely participates in fatty acid beta-oxidation via fatty acyl-CoA binding.

Conclusions:

  • PI-TP and nsL-TP, despite structural similarities, perform divergent critical functions in cellular transport and metabolism.
  • PI-TP's role in regulating specific phosphoinositide synthesis is vital for vesicle dynamics.
  • nsL-TP is implicated in peroxisomal fatty acid catabolism, highlighting the diverse roles of lipid transfer proteins.