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Sphingolipid-derived signalling modulators: interaction with phosphatidylserine

A C Rigby1, K R Barber, C W Grant

  • 1Department of Biochemistry, University of Western Ontario, London, Canada.

Biochimica Et Biophysica Acta
|October 23, 1996
PubMed
Summary
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Anionic lipids like phosphatidylserine influence the orientation of sphingoid base carbohydrate residues in membranes. This interaction alters physical behavior, potentially impacting signal transduction mechanisms.

Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Lipid Signaling

Background:

  • Deuterium-labeled sphingoid bases enable NMR spectroscopy of signaling modulators in membranes.
  • Sphingoid bases are crucial signaling molecules whose membrane behavior may be modulated by lipid interactions.

Purpose of the Study:

  • To investigate if sphingoid bases exhibit altered physical behavior upon association with anionic lipids.
  • To explore the mechanism of sphingoid base involvement in signal transduction through lipid interactions.

Main Methods:

  • Synthesis of deuterium-labeled lyso-dihydrogalactosylceramide ([2H4]lyso-GalCer) and N,N-dimethylsphingosine ([2H6]dimethylsphingosine).
  • Incorporation of labeled sphingoid bases into 1-palmitoyl-2-oleoylphosphatidylcholine/cholesterol bilayer membranes.

Related Experiment Videos

  • Studying the effects of anionic phosphatidylserine on sphingoid base behavior using NMR spectroscopy.

    • Main Results:

    • Phosphatidylserine rapidly and reversibly interacted with sphingoid bases in the membrane.
    • Anionic phosphatidylserine significantly controlled the orientation of the [2H4]lyso-GalCer carbohydrate residue.
    • Negative charges had minimal spectral influence on the [2H4]lyso-GalCer backbone or the [2H6]dimethylsphingosine amino group.

    Conclusions:

    • Sphingoid base association with anionic lipids like phosphatidylserine alters their physical behavior.
    • These lipid-induced packing alterations can create spatial constraints in the adjacent aqueous domain.
    • The findings suggest a mechanism for sphingoid base involvement in signal transduction via lipid interactions.