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Reporter Genes

Reporter Genes

Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
Commonly used reporter...

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Effect of Fluorescent Proteins on Fusion Partners Using Polyglutamine Toxicity Assays in Yeast

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Dimerization-dependent green and yellow fluorescent proteins.

Spencer C Alford, Yidan Ding, Thomas Simmen

ACS Synthetic Biology

|May 10, 2013

Summary

This summary is machine-generated.

Engineered green and yellow dimerization-dependent fluorescent proteins (ddFPs) enable live-cell detection of protein interactions and protease activity. These novel ddFPs, including ddGFP, offer improved brightness and function as biosensors for cellular proximity.

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Last Updated: May 11, 2026

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Area of Science:

Biotechnology
Molecular Biology
Cell Biology

Background:

Dimerization-dependent fluorescent proteins (ddFPs) are genetically encoded reporters for detecting protein interactions in live cells.
The initial tool, a red fluorescent ddFP (ddRFP), was derived from a Discosoma red fluorescent protein variant.
This study expands the ddFP toolkit with green (ddGFP) and yellow (ddYFP) variants.

Discussion:

Optimized ddGFP and ddYFP variants exhibit enhanced in vitro contrast and brightness compared to ddRFP.
ddYFP shows increased brightness and a reduced pKa, improving its utility.
Both engineered variants serve as effective biosensors for protease activity in live-cell imaging.

Key Insights:

Engineered ddGFP and ddYFP offer improved performance characteristics for protein interaction studies.
These novel ddFPs are validated as sensitive biosensors for protease activity.
ddGFP was successfully utilized to create a sensitive indicator for endomembrane proximity, specifically imaging the ER-mitochondria interface.

Outlook:

The expanded ddFP palette provides researchers with versatile tools for live-cell imaging and molecular interaction studies.
Further applications of ddFPs in studying cellular dynamics and disease mechanisms are anticipated.
The development of ddGFP as an endomembrane proximity sensor opens new avenues for investigating organelle interactions.