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CaMKII binds both substrates and activators at the active site.

Can Özden1, Roman Sloutsky2, Tomohiro Mitsugi3

  • 1Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, MA 01003, USA; Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, MA 01003, USA.

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Calcium/calmodulin-dependent protein kinase II (CaMKII) activation for long-term memory is not explained by the two-site model. High-affinity binding partners kinetically compete with autoinhibition to sustain CaMKII activity.

Keywords:
AMPA-type glutamate receptorCP: Molecular biologyCa(2+)/calmodulin dependent protein kinase IILTPNMDA-type glutamate receptorTiam1X-ray crystallography

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Area of Science:

  • Molecular biology
  • Neuroscience
  • Biochemistry

Background:

  • Calcium/calmodulin-dependent protein kinase II (CaMKII) is crucial for long-term memory.
  • Activated CaMKII sustains signaling after calcium levels decrease.
  • Persistent CaMKII activation can occur via autophosphorylation or binding partners.

Purpose of the Study:

  • To test the long-standing model of CaMKII activation involving distinct S and T sites.
  • To elucidate the mechanism by which binding partners persistently activate CaMKII.

Main Methods:

  • X-ray crystallography
  • Molecular dynamics simulations
  • Biochemical assays

Main Results:

  • Structural data revealed that CaMKII activators and substrates bind to a single continuous site.
  • The data are inconsistent with the proposed two-site (S and T) model of CaMKII activation.
  • A new model is proposed involving high-affinity binding partners that compete with autoinhibition.

Conclusions:

  • The established two-site model for CaMKII activation by binding partners is not supported by structural and biochemical data.
  • Persistent CaMKII activity is facilitated by high-affinity binding partners that kinetically outcompete autoinhibition.
  • This provides a revised mechanistic understanding of CaMKII regulation and its role in memory.