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Updated: Jun 4, 2026

Bimolecular Fluorescence Complementation

Bimolecular Fluorescence Complementation

Published on: April 15, 2011

An improved bimolecular fluorescence complementation tool based on superfolder green fluorescent protein.

Jun Zhou¹, Jian Lin, Cuihong Zhou

¹Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Biomedical Engineering, Beihang University, Beijing, China.

Acta Biochimica Et Biophysica Sinica

|January 29, 2011

Summary

This summary is machine-generated.

This study improves Bimolecular Fluorescence Complementation (BiFC) by mutating a superfolder GFP fragment to reduce false positives in protein-protein interaction (PPI) analysis. The modified tool enhances PPI detection accuracy in cellular studies.

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Area of Science:

Molecular Biology
Biochemistry
Cell Biology

Background:

Bimolecular fluorescence complementation (BiFC) is a valuable technique for visualizing protein-protein interactions (PPIs) within living cells.
A significant limitation of BiFC is the potential for false-positive results due to spontaneous self-assembly of the non-fluorescent protein fragments.

Purpose of the Study:

To develop an improved BiFC system with reduced false-positive signals.
To engineer a superfolder GFP (sfGFP)-based BiFC tool with enhanced specificity for PPI analysis.

Main Methods:

Constructed a pair of complementary sfGFP fragments (sfGFPN and sfGFPC).
Introduced site-directed mutations into the sfGFPC fragment (resulting in sfGFPC(m12)) to minimize self-assembly.
Evaluated the performance of the modified BiFC system in detecting PPIs and controlling for false positives.

Main Results:

The mutated sfGFPC(m12) fragment significantly decreased the signal in negative control experiments, indicating reduced spontaneous self-assembly.
The engineered BiFC tool demonstrated improved accuracy in visualizing protein-protein interactions.

Conclusions:

The modified sfGFPC(m12) fragment provides an effective strategy to mitigate false-positive signals in BiFC assays.
This improved BiFC tool offers a more reliable method for studying protein-protein interactions in various biological contexts.