8OSI image
Entry Detail
PDB ID:
8OSI
Title:
Genetically encoded green ratiometric calcium indicator FNCaMP in calcium-bound state
Biological Source:
PDB Version:
Deposition Date:
2023-04-19
Release Date:
2023-05-24
Method Details:
Experimental Method:
Resolution:
2.42 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:mNeonGreen,Calmodulin,Contig An16c0100, genomic contig
Chain IDs:A
Chain Length:463
Number of Molecules:1
Biological Source:Branchiostoma lanceolatum, Aspergillus niger
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CR2 A GLY chromophore
Ligand Molecules
Primary Citation
FNCaMP, ratiometric green calcium indicator based on mNeonGreen protein.
Biochem.Biophys.Res.Commun. 665 169 177 (2023)
PMID: 37163937 DOI: 10.1016/j.bbrc.2023.04.108

Abstact

Neurobiologists widely use green genetically encoded calcium indicators (GECIs) for visualization of neuronal activity. Among them, ratiometric GECIs allow imaging of both active and non-active neuronal populations. However, they are not popular, since their properties are inferior to intensiometric GCaMP series of GECIs. The most characterized and developed ratiometric green GECI is FGCaMP7. However, the dynamic range and sensitivity of its large Stock's shift green (LSS-Green) form is significantly lower than its Green form and its molecular design is not optimal. To address these drawbacks, we engineered a ratiometric green calcium indicator, called FNCaMP, which is based on bright mNeonGreen protein and calmodulin from A. niger and has optimal NTnC-like design. We compared the properties of the FNCaMP and FGCaMP7 indicators in vitro, in mammalian cells, and in neuronal cultures. Finally, we obtained and analyzed X-ray structure of the FNCaMP indicator.

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Primary Citation of related structures