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Related Experiment Videos

Phosphorylation-dependent conformational changes induce a switch in the actin-binding function of MARCKS.

M R Bubb1, R H Lenox, A S Edison

  • 1Department of Medicine, University of Florida, Gainesville, Florida 32610, USA.

The Journal of Biological Chemistry
|December 14, 1999
PubMed
Summary

Phosphorylation of myristoylated alanine-rich protein kinase C substrate (MARCKS) changes its structure, reducing its ability to cross-link actin filaments. This structural shift, not dimerization, explains MARCKS

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Myristoylated alanine-rich protein kinase C substrate (MARCKS) plays a role in actin filament regulation.
  • Phosphorylation by protein kinase C alters MARCKS' function, yet the precise mechanism remains unclear.
  • Previous models suggested MARCKS dimerization for actin cross-linking, but this is unproven.

Purpose of the Study:

  • To investigate the structural changes in MARCKS upon phosphorylation.
  • To elucidate the mechanism by which phosphorylation affects MARCKS' actin-binding and cross-linking activities.
  • To determine if MARCKS functions as a monomer or dimer in actin cross-linking.

Main Methods:

  • Circular dichroism spectroscopy to analyze peptide structure in solution.

Related Experiment Videos

  • Biophysical characterization of MARCKS peptide structure and oligomeric state.
  • Investigating the impact of phosphorylation on MARCKS structure and actin binding.

    • Main Results:

    • MARCKS peptide with actin-cross-linking activity exhibits an extended structure in aqueous solution.
    • Phosphorylation induces a more compact structure in the MARCKS peptide.
    • MARCKS peptide is monomeric, irrespective of phosphorylation state, and phosphorylation reduces the average number of actin-binding sites.

    Conclusions:

    • Phosphorylation-induced structural changes in MARCKS, not dimerization, underlie the loss of actin filament cross-linking activity.
    • MARCKS functions as a monomer, with two distinct actin-binding sites responsible for cross-linking activity in its unphosphorylated state.
    • Structural dynamics of MARCKS are critical for regulating its biological function in response to phosphorylation.