Genetically encoded red fluorescent copper(I) sensors for cellular copper(I) imaging.

Area of Science:

• Biochemistry
• Molecular Biology
• Biophysics

Background:

• Copper(I) is vital for biological processes, but its dysregulation causes severe diseases like Wilson's and Menkes.
• Monitoring copper(I) dynamics in vivo is crucial for understanding and diagnosing these diseases.
• Existing fluorescent sensors for copper(I) primarily use green or yellow fluorescent proteins (FPs), limiting applications.

Purpose of the Study:

• To develop novel red fluorescent protein-based sensors for copper(I).
• To explore the potential of red fluorescent sensors for improved cellular imaging due to reduced phototoxicity and autofluorescence.

Main Methods:

• Grafting a red fluorescent protein (FP) into three distinct positions of a copper(I)-binding protein.
• Generating and characterizing a series of red fluorescent copper(I) sensors.

Main Results:

• Successfully created red fluorescent copper(I) sensors.
• Demonstrated the viability of these sensors for cellular copper(I) imaging, despite limited in vivo sensitivity.
• Identified these sensors as a foundation for future, more sensitive biosensors.

Conclusions:

• Red fluorescent sensors offer a promising alternative for copper(I) imaging.
• Further development is needed to achieve biologically relevant sensitivity for copper(I) monitoring.
• These sensors represent a significant step towards advanced tools for studying copper-related diseases.