Calmodulin
Calmodulin - Related Videos
07:51
Pull-down of Calmodulin-binding Proteins
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Cited by 19 •
2012
Calmodulin (CaM) pull-down assay is an effective way to investigate the interaction of CaM with various proteins. This method uses CaM-sepharose beads for efficient and specific analysis of CaM-binding proteins. This provides an important tool to explore CaM signaling in cellular function.
01:16
Calmodulin-dependent Signaling
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2023
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. The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
10:36
Purification of Native Complexes for Structural Study Using a Tandem Affinity Tag Method
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Cited by 4 •
2016
The Tandem Affinity Purification (TAP) method has been used extensively to isolate native complexes from cellular extract, primarily eukaryotic, for proteomics. Here, we present a TAP method protocol optimized for purification of native complexes for structural studies.
04:02
Drosophila In Vivo Calcium Imaging: A Method for Functional Imaging of Neuronal Activity
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2023
This video describes in vivo calcium imaging in Drosophila neurons using GCaMP. The featured protocol clip shows how to record changes in GCaMP fluorescence from mushroom body neurons during an olfactory conditioning experiment.
08:08
Co-Immunoprecipitation and Pull-Down Assays
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2023
Co-immunoprecipitation (CoIP) and pull-down assays are closely related methods to identify stable protein-protein interactions. These methods are related to immunoprecipitation, a method for separating a target protein bound to an antibody from unbound proteins. In CoIP, an antibody-bound protein is itself bound to another protein that does not bind with the antibody, this is followed by a separation process that preserves the protein-protein complex. The difference in pull-down assays is that...
FAQs
The four EF-hand sites give calmodulin multiple points at which intracellular calcium changes can be registered. Calcium binding alters the protein’s shape, and that structural change enables interactions with target proteins. This coupling is important because the calcium signal becomes a regulated molecular interaction rather than remaining an isolated change in calcium concentration.
The identity of calmodulin’s target protein helps determine the cellular response associated with calcium signaling. Its partners include kinases and phosphatases, as well as ion channels and cytoskeletal regulators. This range of targets allows calcium-dependent signaling to participate in distinct cellular activities and regulatory systems.
Calcium binding can be translated into cellular responses because calmodulin couples calcium occupancy to a conformational switch. The resulting change in shape controls how it interacts with target proteins. This mechanism explains how fluctuations in a signaling molecule can influence processes as different as secretion, metabolism, gene expression, and muscle contraction.
A calmodulin-focused investigation can examine the protein together with its binding partners and ask how calcium-dependent interactions relate to cellular responses. The relevant targets span kinases, phosphatases, ion channels, and cytoskeletal regulators. Studying these relationships helps researchers connect molecular signaling events with broader physiological regulation.
Calmodulin research extends beyond describing calcium signaling because its interactions can be examined in relation to physiological regulation, disease mechanisms, and therapeutic strategies. By linking calcium-dependent target engagement with cellular outcomes, studies can identify how signaling control may be altered and why calmodulin-associated pathways matter in biomedical investigation.
Within biology, calmodulin provides a common signaling connection across muscle, metabolic, secretory, gene-expression, and neuronal contexts. The same calcium-responsive protein can therefore be considered in processes with very different outputs. This makes its binding partners especially important when interpreting how intracellular calcium changes produce context-specific cellular behavior.