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Pull-down of Calmodulin-binding Proteins
07:51

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

Structural analysis of the complex between calmodulin and full-length myelin basic protein, an intrinsically

Viivi Majava1, Chaozhan Wang, Matti Myllykoski

  • 1Department of Biochemistry, University of Oulu, PO Box 3000, 90014, Oulu, Finland.

Amino Acids
|October 27, 2009
PubMed

Insights

Myelin basic protein (MBP) interacts with calmodulin (CaM), undergoing folding upon binding. This study reveals the 3D structure of the MBP-CaM complex and identifies a novel glucosylation modification in MBP.

Area of Science:

  • Neuroscience
  • Structural Biology
  • Biochemistry

Background:

  • Myelin basic protein (MBP) is a key component of the myelin sheath in the central and peripheral nervous systems.
  • MBP is intrinsically disordered in solution and interacts with various proteins, including the calcium sensor calmodulin (CaM).

Purpose of the Study:

  • To structurally and thermodynamically characterize the interaction between MBP and CaM.
  • To investigate the consequences of CaM binding on MBP structure.
  • To identify post-translational modifications of MBP.

Main Methods:

  • Small-angle X-ray scattering (SAXS)
  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Synchrotron radiation circular dichroism (SRCD) spectroscopy
  • Size exclusion chromatography (SEC)
  • Analysis of post-translational modifications

Main Results:

  • Determined 3D structures of the MBP-CaM complex at various stoichiometries, revealing ligand-induced folding of MBP.
  • Obtained thermodynamic data for CaM-binding sites, showing CaM does not collapse upon binding.
  • Confirmed colocalization of CaM and MBP in myelin sheaths.
  • Identified glucosylation as a novel post-translational modification of rat brain MBP.

Conclusions:

  • The study provides a detailed 3D model of the MBP-CaM complex, elucidating their interaction mechanism.
  • Ligand binding induces structural changes in MBP, impacting its function within the myelin sheath.
  • The discovery of MBP glucosylation opens new avenues for understanding myelin regulation.

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