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Related Experiment Videos

Saposin B binds and transfers phospholipids.

Fiorella Ciaffoni1, Massimo Tatti, Alessandra Boe

  • 1Department of Hematology, Oncology, and Molecular Medicine, Istituto Superiore Sanita, Roma, Italy.

Journal of Lipid Research
|February 8, 2006
PubMed
Summary

Saposin B (Sap B) extracts phospholipids and sphingolipids from membranes, with higher affinity for phospholipids. This protein also transfers phospholipids between surfaces, suggesting a physiological role in lysosomal lipid metabolism.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Saposin B (Sap B) is a glycoprotein involved in lysosomal sphingolipid degradation.
  • Its interaction with phospholipids and cholesterol remains poorly understood.
  • Understanding Sap B's lipid interactions is crucial for lysosomal function research.

Purpose of the Study:

  • To investigate the interaction of Saposin B with phospholipids and cholesterol.
  • To determine Sap B's capacity for lipid binding and transfer.
  • To elucidate the physiological relevance of Sap B's lipid interactions in the lysosomal environment.

Main Methods:

  • Utilized large unilamellar vesicles (LUVs) as model membranes.
  • Analyzed Sap B's extraction of various lipids including phospholipids (PC, PI), sphingolipids (GM1, CS), and cholesterol (Chol).

Related Experiment Videos

  • Assessed phospholipid binding and transfer activities at different pH values.

    • Main Results:

    • Sap B extracted phosphatidylcholine (PC) and phosphatidylinositol (PI) phospholipids, but not cholesterol.
    • It solubilized more PI than sphingolipids (GM1, CS) and inhibited PC solubilization at higher PI levels.
    • Sap B demonstrated both phospholipid binding and transfer capabilities, optimal at low pH.

    Conclusions:

    • Sap B interacts with and transfers phospholipids, with preferential binding to anionic phospholipids.
    • These activities occur under conditions mimicking the late endosomal/lysosomal compartment.
    • Sap B's phospholipid binding and transfer functions may be physiologically relevant for lysosomal lipid metabolism.