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Related Experiment Videos

Localization of basic proteins in human myelin

J McLaurin1, C A Ackerley, M A Moscarello

  • 1Department of Biochemistry, Hospital for Sick Children, Toronto, Canada.

Journal of Neuroscience Research
|August 15, 1993
PubMed
Summary

Researchers localized a specific myelin basic protein (MBP) component, C-8, to the intraperiod line of myelin using immunoelectron microscopy and specific antibodies, clarifying MBP localization within the myelin sheath.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Myelin basic proteins (MBPs) are crucial for myelin sheath structure, comprising 35% of total myelin protein.
  • Previous localization studies were hindered by the heterogeneity of MBP, existing as multiple charge isomers.
  • Antibodies against total MBP recognized all isomers, preventing specific localization.

Purpose of the Study:

  • To resolve the specific localization of individual myelin basic protein (MBP) components within the myelin sheath.
  • To identify the precise location of the citrulline-containing MBP component (C-8) using highly specific antibodies.

Main Methods:

  • Fractionation of MBPs into distinct charge isomers.
  • Development and utilization of specific antibodies, including anti-MBP, anti-MBP peptides, and anti-citrulline peptide antibodies.

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  • Immunoelectron microscopy with gold-conjugated antibodies to visualize MBP localization at the ultrastructural level.

    • Main Results:

    • The citrulline-containing MBP component (C-8) was predominantly localized to the intraperiod line of myelin (66.5% of gold particles).
    • Antibodies against total MBP labeled both the major dense line and the intraperiod line.
    • Antibodies targeting residues 69-74 localized primarily to the major dense line (59.4%), with some at the intraperiod line (23.6%).
    • C-8 demonstrated preferential association with lipids at the intraperiod line, supported by observations during myelin swelling and recompaction.

    Conclusions:

    • Component 8 (C-8) of myelin basic protein is specifically localized to the intraperiod line of the myelin sheath.
    • This precise localization of C-8 is linked to its association with lipids within the myelin structure.
    • The study resolves ambiguities in MBP localization by differentiating between individual charge isomers.