7Z7Q image
Deposition Date 2022-03-16
Release Date 2022-05-04
Last Version Date 2024-10-16
Entry Detail
PDB ID:
7Z7Q
Title:
Structure of the T207D single-point mutant of the fluorescent protein NeonCyan1 at pH 6.5
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:NeonCyan1
Chain IDs:A, B, C, D
Chain Length:236
Number of Molecules:4
Biological Source:Branchiostoma lanceolatum
Primary Citation
Cyan fluorescent proteins derived from mNeonGreen.
Protein Eng.Des.Sel. 35 ? ? (2022)
PMID: 35417013 DOI: 10.1093/protein/gzac004

Abstact

mNeonGreen, an engineered green fluorescent protein (GFP) derived from lancelet, is one of the most brightly fluorescent homologs of Aequorea victoria jellyfish GFP (avGFP) yet reported. In this work, we investigated whether this bright fluorescence might be retained in homologs of mNeonGreen with modified chromophore structures and altered fluorescent hues. We found mNeonGreen to be generally less tolerant than avGFP to chromophore modification by substitution of the key chromophore-forming tyrosine residue with other aromatic amino acids. However, we were ultimately successful in creating a variant, designated as NeonCyan1, with a tryptophan-derived cyan fluorescent protein (CFP)-type chromophore, and two additional mutants with distinct spectral hues. Structural, computational, and photophysical characterization of NeonCyan1 and its variants provided insight into the factors that control the fluorescence emission color. Though not recommended as replacements for contemporary CFP variants, we demonstrate that NeonCyan1 variants are potentially suitable for live cell imaging applications.

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