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Pull-down of Calmodulin-binding Proteins

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

Conformational changes underlying calcium/calmodulin-dependent protein kinase II activation.

Laurel Hoffman¹, Richard A Stein, Roger J Colbran

¹Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.

The EMBO Journal

|February 24, 2011

Summary

Calcium/calmodulin-dependent protein kinase II (CaMKII) activation involves dynamic structural changes. Spin labeling reveals how calmodulin binding and autophosphorylation regulate CaMKII activity and substrate access.

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Calcium/calmodulin-dependent protein kinase II (CaMKII) is crucial for interpreting calcium signals.
CaMKII transitions between autoinhibited and active states to process signal information.

Purpose of the Study:

To elucidate the structural and dynamic mechanisms of CaMKII autoinhibition and activation.
To investigate the role of the regulatory domain in CaMKII function.

Main Methods:

Spin labeling and electron paramagnetic resonance (EPR) spectroscopy were employed.
These techniques allowed for the study of structural and dynamic changes in the CaMKII kinase domain.

Main Results:

Autoinhibition involves a conformational equilibrium of the regulatory domain, controlling access to substrates and nucleotides.
Calmodulin binding induces conformational changes, activating the kinase and exposing the Thr286 phosphorylation site.
Autophosphorylation at Thr286 sustains activation by disrupting regulatory domain interactions and enhancing calmodulin binding.

Conclusions:

A dynamic model for CaMKII autoregulation is proposed, explaining its mechanism of action.
The findings reconcile structural dynamics with existing biochemical and functional data on CaMKII holoenzyme.