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Calmodulin-dependent Signaling

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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Feedback Regulation of Calcium Concentration

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Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
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GPCR Desensitization

GPCR Desensitization

G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...

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Related Experiment Video

Updated: May 25, 2026

Pull-down of Calmodulin-binding Proteins

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

Pull-down of calmodulin-binding proteins.

Kanwardeep S Kaleka¹, Amber N Petersen, Matthew A Florence

¹Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, USA.

Journal of Visualized Experiments : Jove

|February 3, 2012

Summary

This study introduces a CaM pull-down assay to efficiently test protein binding to calmodulin (CaM) in the presence or absence of calcium ions (Ca2+). This method aids in understanding Ca2+/CaM signaling and protein interactions.

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Published on: July 7, 2011

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Pull-down of Calmodulin-binding Proteins

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Published on: January 23, 2012

Live Cell Calcium Imaging Combined with siRNA Mediated Gene Silencing Identifies Ca2+ Leak Channels in the ER Membrane and their Regulatory Mechanisms

Live Cell Calcium Imaging Combined with siRNA Mediated Gene Silencing Identifies Ca²⁺ Leak Channels in the ER Membrane and their Regulatory Mechanisms

Published on: July 7, 2011

Area of Science:

Cellular Biology
Biochemistry
Molecular Signaling

Background:

Calcium ions (Ca2+) are crucial for cellular regulation, with calmodulin (CaM) mediating many Ca2+ signaling pathways.
CaM's conformation changes upon Ca2+ binding, influencing its interactions with various target proteins involved in processes like apoptosis, metabolism, and synaptic plasticity.
Some proteins bind Ca2+-bound CaM for activation, while others, like neurogranin (Ng), bind Ca2+-free CaM, impacting synaptic function.

Purpose of the Study:

To present a novel, efficient method for assessing protein-CaM binding affinity under varying Ca2+ conditions.
To validate the utility of this method using Ca2+/CaM-dependent kinase II (CaMKII) and neurogranin (Ng) as model proteins.
To facilitate research into Ca2+/CaM signaling pathways and the functional consequences of altered CaM-protein interactions.

Main Methods:

Development and application of a CaM pull-down assay utilizing CaM-Sepharose beads.
Testing the binding of CaMKII and Ng to CaM in both Ca2+-dependent and Ca2+-independent states.
Comparative analysis of the assay's efficiency in terms of time and protein requirement versus traditional chromatography methods.

Main Results:

The CaM pull-down assay effectively demonstrates Ca2+-dependent and Ca2+-independent binding of proteins to CaM.
The assay proved to be significantly more time-efficient and required less protein compared to conventional column chromatography.
Successful application of the assay to study mutated neurogranin's altered CaM binding, relevant to synaptic function.

Conclusions:

The CaM pull-down assay is a valuable and efficient tool for characterizing CaM-protein interactions.
This method provides critical insights into the role of Ca2+ in modulating CaM-mediated cellular processes.
The assay supports the investigation of disease mechanisms linked to dysregulated Ca2+/CaM signaling.