8C0T image
Entry Detail
PDB ID:
8C0T
Title:
NRS 1.2: Fluorescent Sensors for Imaging Interstitial Calcium
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-12-19
Release Date:
2023-11-15
Method Details:
Experimental Method:
Resolution:
1.28 Å
R-Value Free:
0.20
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:mNeonGreen,Optimized Ratiometric Calcium Sensor
Chain IDs:A
Chain Length:303
Number of Molecules:1
Biological Source:Branchiostoma lanceolatum
Primary Citation
Fluorescent sensors for imaging of interstitial calcium.
Nat Commun 14 6220 6220 (2023)
PMID: 37798285 DOI: 10.1038/s41467-023-41928-w

Abstact

Calcium in interstitial fluids is central to systemic physiology and a crucial ion pool for entry into cells through numerous plasma membrane channels. Its study has been limited by the scarcity of methods that allow monitoring in tight inter-cell spaces of living tissues. Here we present high performance ultra-low affinity genetically encoded calcium biosensors named GreenT-ECs. GreenT-ECs combine large fluorescence changes upon calcium binding and binding affinities (Kds) ranging from 0.8 mM to 2.9 mM, making them tuned to calcium concentrations in extracellular organismal fluids. We validated GreenT-ECs in rodent hippocampal neurons and transgenic zebrafish in vivo, where the sensors enabled monitoring homeostatic regulation of tissue interstitial calcium. GreenT-ECs may become useful for recording very large calcium transients and for imaging calcium homeostasis in inter-cell structures in live tissues and organisms.

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