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Myelin basic protein as a "PI(4,5)P2-modulin": a new biological function for a major central nervous system protein

Abdiwahab A Musse1, Wen Gao, Lopamudra Homchaudhuri

  • 1Department of Molecular and Cellular Biology and Biophysics Interdepartmental Group, University of Guelph, 50 Stone Road East, Guelph, Ontario, Canada, N1G 2W1.

Biochemistry
|September 5, 2008
PubMed

Insights

Myelin basic protein (MBP) sequesters phosphatidylinositol-(4,5)-bis-phosphate (PI(4,5)P 2) in membranes, similar to other PIPmodulins. This interaction regulates PI(4,5)P 2 availability, potentially influencing oligodendrocyte membrane processes during myelinogenesis.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Myelin basic protein (MBP) shares structural similarities with proteins like MARCKS.
  • MBP is known to be multifunctional, with roles beyond myelination.
  • Phosphatidylinositol-(4,5)-bis-phosphate (PI(4,5)P 2) is a critical membrane lipid involved in cellular signaling and membrane dynamics.

Purpose of the Study:

  • To investigate if 18.5 kDa MBP can sequester PI(4,5)P 2 in membranes, akin to MARCKS and other PIPmodulins.
  • To characterize the nature and regulation of MBP-PI(4,5)P 2 interactions.
  • To explore the in vivo relevance of MBP-PI(4,5)P 2 interactions in oligodendrocytes.

Main Methods:

  • Utilized fluorescence-quenching and electron paramagnetic resonance (EPR) spectroscopy with labeled PI(4,5)P 2 in model membranes.
  • Employed confocal microscopy to observe MBP and PI(4,5)P 2 colocalization in cultured oligodendrocytes.
  • Investigated the influence of cholesterol, phosphorylation, deimination, and Ca(2+)-CaM binding on MBP-PI(4,5)P 2 interactions.

Main Results:

  • Demonstrated that MBP laterally sequesters PI(4,5)P 2 in model membranes.
  • Found that MBP-PI(4,5)P 2 interactions are electrostatic, partially cholesterol-dependent, and modulated by phosphorylation, deimination, and Ca(2+)-CaM.
  • Observed patched colocalization of MBP and PI(4,5)P 2 in oligodendrocytes, indicating spatial clustering.

Conclusions:

  • MBP functions as a PIPmodulin, sequestering PI(4,5)P 2 in membranes.
  • MBP shares mechanistic similarities with other PIPmodulins like MARCKS, GAP-43, and CAP-23.
  • MBP-mediated regulation of PI(4,5)P 2 availability may play a role in oligodendrocyte membrane remodeling during myelinogenesis.

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