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Related Experiment Videos

Three isoforms of human myelin basic protein: purification and structure

G E Deibler1, T V Burlin, A L Stone

  • 1Laboratory of Cerebral Metabolism, National Institute of Mental Health, Bethesda, MD 20892-4030, USA.

Journal of Neuroscience Research
|August 15, 1995
PubMed
Summary

Researchers purified human myelin basic protein (HMBP) isoforms, revealing distinct structural differences. Phosphorylation of HMBP component 3 significantly increased its ordered structure, impacting beta-turns.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Structural Biology

Background:

  • Myelin basic protein (MBP) is crucial for myelin sheath formation and exists in multiple isoforms.
  • Understanding the structural variations and post-translational modifications of human MBP (HMBP) is essential for comprehending its function.

Purpose of the Study:

  • To highly purify and characterize distinct isoforms of human myelin basic protein (HMBP).
  • To investigate the structural impact of phosphorylation and truncation on HMBP isoforms.

Main Methods:

  • Ion-exchange chromatography and fast protein liquid chromatography (FPLC) for HMBP isoform purification.
  • Limited tryptic digestion to isolate phosphorylated HMBP component 3.
  • Phosphate analysis and Nuclear Magnetic Resonance (NMR) spectroscopy to confirm phosphorylation site.

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  • Circular dichroism (CD) spectroscopy and computational analysis to assess protein structure.

    • Main Results:

    • Successfully purified HMBP component 1 (18.5 kDa HMBP-1), 17.2 kDa HMBP, and monophosphorylated HMBP component 3 (HMBP3pT98).
    • HMBP3pT98 was confirmed to be phosphorylated specifically at threonine 98 with approximately 1 mole P/mole protein.
    • CD spectral analysis revealed distinct structural differences between HMBP-1, 17.2 kDa HMBP, and HMBP3pT98.
    • Computational analysis indicated a ~9% increase in ordered structure for 17.2 kDa HMBP and a ~12% increase for HMBP3pT98, attributed to beta-structure and beta-turn formation.

    Conclusions:

    • Human MBP exists in multiple forms with distinct structural properties.
    • Phosphorylation at threonine 98 significantly alters the secondary structure of HMBP component 3, increasing its ordered content.
    • Truncation to 17.2 kDa also induces structural changes, suggesting isoform-specific structural roles in myelin.