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Related Concept Videos

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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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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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Related Experiment Videos

Brevican isoforms associate with neural membranes.

Constanze I Seidenbecher1, Karl-Heinz Smalla, Nora Fischer

  • 1AG Molecular Mechanisms of Plasticity, Department of Neurochemistry/Molecular Biology, Leibniz Institute for Neurobiology, 39118 Magdeburg, Germany. seidenc@ifn-magdeburg.de

Journal of Neurochemistry
|October 23, 2002
PubMed
Summary
This summary is machine-generated.

Brevican, a brain proteoglycan, is anchored to neuronal surfaces via glycosylphosphatidylinositol (GPI) anchors and extracellular matrix interactions. This anchoring mechanism is crucial for the structural integrity of perineuronal nets in the central nervous system (CNS).

Related Experiment Videos

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Brevican is a neural-specific proteoglycan found in the brain's extracellular matrix, particularly abundant in the terminally differentiated central nervous system (CNS).
  • It is expressed by both neuronal and glial cells and is a key component of perineuronal nets, decorating neuronal surfaces.

Purpose of the Study:

  • To investigate the anchoring mechanisms of brevican to neuronal surfaces.
  • To determine the specific molecular interactions involved in brevican's association with the cell membrane and extracellular matrix.

Main Methods:

  • Ethanolamine incorporation studies to identify glycosylphosphatidylinositol (GPI) anchoring.
  • Sucrose gradient ultracentrifugation to analyze brevican's association with membrane fractions.
  • Enzymatic treatments (chondroitinase ABC, hyaluronidase, phosphatidylinositol-specific phospholipase C) to assess the nature of brevican-matrix interactions.

Main Results:

  • One brevican isoform possesses a GPI anchor attachment site and is glypiated in transfected cells and oligodendrocyte precursor cells.
  • A significant portion of brevican is tightly associated with the cell membrane, evidenced by its flotation in sucrose gradients, sensitive to detergent treatment.
  • Brevican's association with the particulate fraction is partially sensitive to chondroitinase ABC and phospholipase C.
  • Enzymatic treatment of hippocampal neurons reduced brevican staining on their surface.

Conclusions:

  • Brevican utilizes both GPI anchoring and interactions with the extracellular matrix for its attachment to neuronal surfaces.
  • These findings suggest a dual anchoring mechanism that contributes to the stability and function of perineuronal nets.
  • Understanding brevican's anchoring is vital for comprehending CNS development, plasticity, and potential therapeutic strategies for neurological disorders.