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07:51
Pull-down of Calmodulin-binding Proteins
Published on: January 23, 2012
AKAP79/150 interacts with the neuronal calcium-binding protein caldendrin
Xenia Gorny1, Marina Mikhaylova, Christian Seeger
1Leibniz Institute for Neurobiology, Magdeburg, Germany.
Journal of Neurochemistry
|June 15, 2012
Summary
A kinase-anchoring protein 79 (AKAP79) interacts with caldendrin, a calcium-binding protein. Caldendrin and calmodulin compete for binding to AKAP79, with calcium levels regulating this interaction.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Signaling
Background:
- A kinase-anchoring protein 79 (AKAP79) is a postsynaptic scaffold protein.
- AKAP79 coordinates receptor phosphorylation and dephosphorylation by anchoring kinases and phosphatases.
- Calmodulin is a known AKAP79 interaction partner regulating protein kinase C (PKC) activity.
Purpose of the Study:
- To investigate the interaction between AKAP79 and caldendrin, a neuronal calcium-binding protein.
- To determine if caldendrin and calmodulin compete for binding to AKAP79.
- To elucidate the role of calcium in regulating these interactions.
Main Methods:
- Pull-down assays to assess protein-protein interactions.
- Surface plasmon resonance (SPR) biosensor analyses to quantify binding kinetics.
- Investigation of calcium-dependent binding.
Main Results:
- AKAP79 interacts with caldendrin.
- Calmodulin and caldendrin compete for a partially overlapping binding site on AKAP79.
- Calcium levels differentially regulate the binding of caldendrin and calmodulin to AKAP79.
Conclusions:
- Caldendrin is a novel AKAP79 binding protein.
- Calcium-dependent competition between caldendrin and calmodulin suggests complementary roles in postsynaptic signaling.
- Caldendrin is a significant addition to the AKAP79 interactome's signaling toolkit.
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