Structural Analysis of the Large Stokes Shift Red Fluorescent Protein tKeima
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View abstract on PubMed
Summary
This summary is machine-generated.We determined the crystal structure of tetrameric Keima (tKeima), a large Stokes shift fluorescent protein. This reveals the structural basis for its tetrameric formation and provides insights for engineering new fluorescent proteins.
Area Of Science
- Biochemistry
- Structural Biology
- Biophysics
Background
- Large Stokes shift fluorescent proteins, like the Keima family, are valuable tools for multicolor imaging and spectroscopy.
- The tetrameric tKeima protein is the ancestral fluorescent protein for dKeima and mKeima, but its structural and molecular properties remain uncharacterized.
Purpose Of The Study
- To elucidate the structural basis of the tetrameric Keima (tKeima) fluorescent protein.
- To understand the molecular properties governing tKeima's structure and provide insights for protein engineering.
Main Methods
- Purification of tKeima protein.
- X-ray crystallography to determine the crystal structure at 3.0 Å resolution.
Main Results
- tKeima exhibits a β-barrel fold with Gln-Tyr-Gly chromophores in a cis-conformation.
- Tetrameric interfaces are stabilized by extensive hydrogen bonds and salt bridges.
- Identified key residues responsible for tetramer formation, differentiating tKeima from dKeima and mKeima.
Conclusions
- The determined structure provides the first detailed molecular insights into tKeima.
- Understanding tKeima's structural features aids in the rational design of novel fluorescent proteins, including monomeric variants.
- This work expands the knowledge of the Keima family and facilitates protein engineering efforts.
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