NRS 1.2: Fluorescent Sensors for Imaging Interstitial Calcium

Experimental Data Snapshot

  • Resolution: 1.28 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report

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Fluorescent sensors for imaging of interstitial calcium.

Valiente-Gabioud, A.A.Garteizgogeascoa Suner, I.Idziak, A.Fabritius, A.Basquin, J.Angibaud, J.Nagerl, U.V.Singh, S.P.Griesbeck, O.

(2023) Nat Commun 14: 6220-6220

  • DOI: https://doi.org/10.1038/s41467-023-41928-w
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    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.

  • Organizational Affiliation

    Institut Interdisciplinaire de Neurosciences, Synaptic Plasticity and Super-Resolution Microscopy, CNRS - Université de Bordeaux - 146 rue Léo-Saignat, Bordeaux, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
mNeonGreen,Optimized Ratiometric Calcium Sensor301Branchiostoma lanceolatumMutation(s): 0 
Gene Names: blFP-Y3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.28 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.332α = 90
b = 62.854β = 90
c = 95.709γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Max Planck SocietyGermany--

Revision History  (Full details and data files)

  • Version 1.0: 2023-11-15
    Type: Initial release