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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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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

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Published on: August 20, 2012

Calmodulin interaction with hEAG1 visualized by FRET microscopy.

J Tiago Gonçalves¹, Walter Stühmer

¹Molecular Biology of Neuronal Signals, Max-Planck Institute for Experimental Medicine, Göttingen, Germany. goncalves@ucla.edu

|June 5, 2010

Summary

This summary is machine-generated.

Calcium ions (Ca2+) regulate ion channels, including the EAG1 potassium channel, via calmodulin (CaM) binding. This study identifies two key CaM binding sites (BD-N and BD-C2) on the native EAG1 channel, crucial for Ca2+ mediated inhibition.

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Area of Science:

Molecular biology
Cellular physiology
Ion channel function

Background:

Calcium ions (Ca2+) are critical intracellular messengers regulating numerous cellular processes.
Ca2+-mediated signaling links intracellular pathways to membrane electrical activity via ion channels.
The voltage-gated potassium channel EAG1 is inhibited by intracellular Ca2+ through calmodulin (CaM) binding.

Purpose of the Study:

To investigate the specific calmodulin (CaM) binding sites involved in the Ca2+-mediated regulation of the human EAG1 (hEAG1) channel.
To determine the contribution of previously identified CaM binding sites (BD-C1, BD-C2, BD-N) to CaM binding on the native hEAG1 channel.

Main Methods:

Utilized Förster resonance energy transfer (FRET) microscopy in mammalian cells to visualize CaM-hEAG1 interactions.
Employed yellow fluorescent protein (YFP)-labeled CaM and Cerulean-labeled hEAG1 for FRET imaging.
Introduced mutations in putative CaM binding sites to assess their role in CaM binding.

Main Results:

Two CaM binding sites, the N-terminal domain (BD-N) and the C-terminal domain 2 (BD-C2), were predominantly involved in CaM binding to hEAG1.
Mutations in either BD-N or BD-C2 completely abolished CaM binding to the hEAG1 channel.
The C-terminal binding domain 1 (BD-C1) was found to be dispensable for CaM binding to the native channel.

Conclusions:

The BD-N and BD-C2 domains are sufficient for mediating CaM binding to the native hEAG1 channel.
The previously proposed BD-C1 site does not independently contribute to CaM binding on the native channel.
This study clarifies the molecular mechanism of Ca2+/CaM-dependent regulation of EAG1 channel activity.