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Calmodulin-dependent Signaling

Calmodulin-dependent Signaling

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,...

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Pull-down of Calmodulin-binding Proteins

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

A note of caution for using calmodulin antibodies.

Mads Munk¹, Martin W Berchtold²

¹Martin W. Berchtold and Mads Munk Department of Biology, Copenhagen University Copenhagen, Denmark.

Journal of Immunological Methods

|November 4, 2024

Summary

Calmodulin (CaM) antibodies may yield misleading results because they target identical proteins from three genes. Researchers should exercise caution with CaM antibody studies and potentially inaccurate databases.

Keywords:

Anti-Calmodulin antibodies CALM1 CALM2 CALM3 Ca2+ signaling CaM CaM1 CaM2 CaM3 Calmodulin genes

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Pull-down of Calmodulin-binding Proteins

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Published on: January 23, 2012

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Published on: March 8, 2013

Using Reference Reagents to Confirm Robustness of Cytokine Release Assays for the Prediction of Monoclonal Antibody Safety

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Published on: September 15, 2023

Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

Calmodulin (CaM) is a vital intracellular calcium receptor regulating numerous cellular functions.
Mammalian cells express three distinct genes (CALM1, CALM2, CALM3) encoding identical CaM protein isoforms.
Antibodies targeting CaM often cannot differentiate between these isoforms, potentially leading to ambiguous experimental outcomes.

Purpose of the Study:

To highlight the potential for misleading conclusions in studies using Calmodulin antibodies.
To caution researchers about the cross-reactivity issues with CaM antibodies and database annotations.

Main Methods:

Review of 44 articles employing Calmodulin antibodies in techniques such as Western blot, ELISA, and immunohistochemistry.
Analysis of studies relying on proteomics and databases with potentially incorrect annotations.

Main Results:

Identified 44 studies that may have reached misleading conclusions due to the use of non-specific Calmodulin antibodies.
Highlighted the unreliability of antibodies that do not distinguish between CaM1, CaM2, and CaM3 isoforms.
Pointed out issues with database annotations contributing to inaccurate interpretations.

Conclusions:

Researchers must be aware that antibodies against Calmodulin may not be specific to individual isoforms (CaM1, CaM2, CaM3).
Conclusions drawn from studies using such antibodies, particularly in Western blot, ELISA, and immunohistochemistry, require careful re-evaluation.
The use of potentially misannotated databases further complicates the interpretation of Calmodulin-related research, necessitating critical assessment.