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Sphingolipid transfer proteins defined by the GLTP-fold.

Lucy Malinina1, Dhirendra K Simanshu2, Xiuhong Zhai1

  • 1The Hormel Institute, University of Minnesota,Austin,MN 55912,USA.

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Glycolipid transfer proteins (GLTPs) possess a unique structure enabling glycolipid transfer. Human GLTPs also regulate inflammation by binding ceramide-1-phosphate, impacting phospholipase A2 activity.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Cell Biology

Background:

  • Glycolipid transfer proteins (GLTPs) are small, soluble proteins facilitating intermembrane glycolipid transfer.
  • GLTPs and homologs share a conserved helical 'sandwich' structure known as the GLTP-fold.
  • Recent studies reveal structural details of lipid headgroup selectivity and hydrophobic pocket adaptability.

Purpose of the Study:

  • To elucidate the structural basis of lipid binding and transfer by GLTPs.
  • To explore the functional evolution and versatility of the GLTP motif in humans.
  • To investigate the role of human GLTP-motifs in glycosphingolipid biosynthesis and inflammatory pathways.

Main Methods:

  • Structural analysis of GLTP-fold architecture.
  • Investigation of lipid headgroup and hydrocarbon chain interactions.
  • Functional assays examining GLTP-mediated transfer and protein-protein interactions.

Main Results:

  • Detailed insights into structural features governing lipid selectivity and accommodation.
  • Demonstration of human GLTP-motifs functioning in both glycosphingolipid biosynthesis and ceramide-1-phosphate transfer.
  • Identification of ceramide-1-phosphate transfer protein activity within the GLTP superfamily, regulating phospholipase A2.

Conclusions:

  • The GLTP-fold provides a versatile structural platform for diverse lipid transfer functions.
  • Human GLTP-motifs have evolved dual roles in lipid metabolism and inflammatory regulation.
  • Ceramide-1-phosphate transfer protein activity is a key function of GLTP-fold proteins, impacting inflammatory signaling.