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Imaging Initial Ca2+ Microdomains in Primary T Cells

Imaging Initial Ca²⁺ Microdomains in Primary T Cells

Published on: October 4, 2024

A common Ca2+-driven interdomain module governs eukaryotic NCX regulation.

Moshe Giladi¹, Yehezkel Sasson, Xianyang Fang

¹Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Ramat-Aviv, Tel-Aviv, Israel.

|July 7, 2012

Summary

This summary is machine-generated.

Calcium binding to regulatory domains in sodium-calcium exchangers (NCX) activates mammalian proteins. This study reveals a Ca(2+)-driven switch mechanism controlling calcium sensing dynamics in NCX variants.

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Area of Science:

Biochemistry
Structural Biology
Cell Physiology

Background:

Sodium-calcium exchangers (NCX) are crucial for cellular calcium homeostasis.
Eukaryotic NCX proteins possess Ca(2+)-binding domains (CBD1, CBD2) that regulate their activity.
Mammalian NCX activation differs from the inhibitory response seen in Drosophila CALX.

Purpose of the Study:

To elucidate the regulatory mechanisms of NCX proteins.
To understand the structural basis for differential Ca(2+) responses in NCX and CALX.

Main Methods:

Determined the crystal structure of mammalian CBD12-E454K at 2.7 Å.
Utilized stopped-flow kinetics and small-angle X-ray scattering (SAXS) analyses.
Investigated CBD12 mutants to understand Ca(2+) binding effects.

Main Results:

Ca(2+) binding to CBD1's Ca3-Ca4 sites induces an interdomain tethering via salt-bridges.
This Ca(2+)-driven switch regulates the dissociation of Ca(2+) from the primary sensor, controlling sensing dynamics.
The interdomain angle in the Ca(2+)-bound state is similar in NCX and CALX, indicating structural conservation.

Conclusions:

The Ca(2+)-driven interdomain switch is a conserved mechanism for initiating regulatory signals in NCX variants.
Interdomain distances do not explain the regulatory diversity between NCX and CALX.
The findings provide insights into the general mechanism of calcium regulation in NCX proteins.