8XC6 image
Entry Detail
PDB ID:
8XC6
Title:
Crystal structure of large stokes shift red fluorescent protein tKeima
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-12-08
Release Date:
2024-04-17
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 2 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:fluorescent protein
Chain IDs:A, B
Chain Length:225
Number of Molecules:2
Biological Source:Montipora sp. 20
Ligand Molecules
Primary Citation
Structural Analysis of the Large Stokes Shift Red Fluorescent Protein tKeima.
Molecules 29 ? ? (2024)
PMID: 38893454 DOI: 10.3390/molecules29112579

Abstact

The Keima family comprises large Stokes shift fluorescent proteins that are useful for dual-color fluorescence cross-correlation spectroscopy and multicolor imaging. The tKeima is a tetrameric large Stokes shift fluorescent protein and serves as the ancestor fluorescent protein for both dKeima and mKeima. The spectroscopic properties of tKeima have been previously reported; however, its structural basis and molecular properties have not yet been elucidated. In this study, we present the crystallographic results of the large Stokes shift fluorescent protein tKeima. The purified tKeima protein spontaneously crystallized after purification without further crystallization. The crystal structure of tKeima was determined at 3.0 Å resolution, revealing a β-barrel fold containing the Gln-Tyr-Gly chromophores mainly with cis-conformation. The tetrameric interfaces of tKeima were stabilized by numerous hydrogen bonds and salt-bridge interactions. These key residues distinguish the substituted residues in dKeima and mKeima. The key structure-based residues involved in the tetramer formation of tKeima provide insights into the generation of a new type of monomeric mKeima. This structural analysis expands our knowledge of the Keima family and provides insights into its protein engineering.

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