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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.
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Genetically encoded Ca(2+) indicators: properties and evaluation.

Vadim Pérez Koldenkova¹, Takeharu Nagai

¹Department of Biomolecular Science and Engineering, Osaka University, Ibaraki, Osaka, Japan.

Biochimica Et Biophysica Acta

|January 29, 2013

Summary

Genetically encoded calcium ion indicators are vital for biological research. This review details in vitro methods to assess indicator properties like dynamic range and affinity, crucial for experimental success.

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Area of Science:

Biochemistry
Molecular Biology
Physiology

Background:

Genetically encoded calcium ion (Ca(2+)) indicators are essential for Ca(2+) imaging in cellular and organismal studies.
In vivo and in situ characterization of these indicators is challenging and time-consuming.
In vitro evaluation is critical for determining indicator suitability for specific experimental conditions.

Purpose of the Study:

To review the properties of genetically encoded Ca(2+) indicators.
To present common strategies for in vitro evaluation of these properties.
To guide the selection of appropriate Ca(2+) indicators for diverse research applications.

Main Methods:

Examination of indicator properties including dynamic range, affinity, selectivity, and kinetics.
Review of established in vitro evaluation strategies.
Synthesis of information relevant to Ca(2+) indicator characterization.

Main Results:

Key properties influencing indicator performance were analyzed.
Standardized in vitro assessment methods were presented.
The importance of in vitro characterization for optimizing Ca(2+) imaging was highlighted.

Conclusions:

In vitro evaluation of genetically encoded Ca(2+) indicators is a necessary step for successful experimental design.
Understanding indicator properties such as dynamic range, affinity, selectivity, and kinetics is crucial.
This review provides a framework for selecting and evaluating Ca(2+) indicators for various biological applications.