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Updated: Feb 5, 2026

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Published on: October 4, 2024

Allosteric regulators selectively prevent Ca

Jacqueline Niu¹, Ivy E Dick², Wanjun Yang³

¹Department of Biomedical Engineering, Johns Hopkins University, Baltimore, United States.

|September 11, 2018

Summary

This summary is machine-generated.

Auxiliary proteins like STAC and FHF selectively modulate calmodulin (CaM) regulation of ion channels. This discovery allows for precise control of cellular excitability and calcium signaling in neurons and cardiomyocytes.

Keywords:

Ca channels Na channels SH3 and cysteine rich domain proteins calcium regulation calmodulin fibroblast growth factor homologous factors molecular biophysics structural biology

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Area of Science:

Neuroscience
Molecular Biology
Biochemistry

Background:

Calmodulin (CaM) is a key regulator of CaV1, CaV2, and NaV1 ion channels, controlling cellular excitability.
Global CaM changes affect all targets indiscriminately, limiting functional adaptability.

Purpose of the Study:

To identify proteins that selectively modulate Ca2+/CaM regulation of specific ion channel families.
To understand the mechanism by which these proteins alter CaM binding and function.
To explore strategies for engineering targeted CaM signaling.

Main Methods:

Investigated the interaction of STAC and FHF proteins with CaV1 and NaV1 channels.
Utilized mutagenesis to map allosteric binding sites on channel carboxy-tails.
Engineered a synthetic CaM-binding motif to demonstrate targeted regulation.

Main Results:

STAC and FHF proteins selectively reduce Ca2+/CaM regulation of CaV1 and NaV1 channels, respectively.
These proteins bind to allosteric sites distinct from the CaM-binding interface.
Synthetic modification of CaV1.3 channels enabled targeted CaM regulation by Mona SH3 domain.

Conclusions:

A class of auxiliary proteins exists that fine-tunes Ca2+/CaM signaling to individual ion channel targets.
These proteins enable spatial and temporal orchestration of cellular excitability feedback.
Findings provide strategies for engineering specific Ca2+/CaM signaling pathways.