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Updated: Jun 27, 2026

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
07:26

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes

Published on: October 15, 2016

Myelin basic protein co-distributes with other PI(4,5)P2-sequestering proteins in Triton X-100 detergent-resistant

Abdiwahab A Musse1, Wen Gao, Godha Rangaraj

  • 1Department of Molecular and Cellular Biology, University of Guelph, 50 Stone Road East, Guelph, Ontario, Canada.

Neuroscience Letters
|November 26, 2008
PubMed

Insights

Myelin basic protein (MBP) sequesters phosphatidylinositol-(4,5)-bis-phosphate (PI(4,5)P(2)), similar to other PI(4,5)P(2)-modulins. This study shows MBP, MARCKS, and GAP-43 co-localize in myelin, supporting MBP's role in regulating PI(4,5)P(2) in myelin.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Myelin basic protein (MBP) is a key component of myelin.
  • Certain proteins, known as PI(4,5)P(2)-modulins, bind and sequester phosphatidylinositol-(4,5)-bis-phosphate (PI(4,5)P(2)).
  • MBP's interaction with PI(4,5)P(2) was previously demonstrated in vitro.

Purpose of the Study:

  • To investigate the co-localization and co-distribution of MBP with other known PI(4,5)P(2)-modulins.
  • To explore the role of MBP in modulating PI(4,5)P(2) availability within myelin.

Main Methods:

  • Co-localization studies in primary rat oligodendrocytes.
  • Analysis of lipid raft fractions from isolated myelin and brain homogenates.
  • Triton X-100 detergent extraction.

Main Results:

  • MBP and Myristoylated alanine-rich C kinase substrate (MARCKS) were found to co-localize in primary rat oligodendrocytes.
  • MBP, MARCKS, and Growth-associated protein of 43kDa (GAP-43) co-distributed in lipid raft fractions.
  • Evidence supports MBP's role as a PI(4,5)P(2) modulator in myelin.

Conclusions:

  • MBP functions similarly to other PI(4,5)P(2)-modulins.
  • MBP, MARCKS, and GAP-43 are present together in myelin lipid rafts.
  • These findings highlight MBP's multifunctional nature and its involvement in regulating PI(4,5)P(2) in the myelin sheath.

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