Using Tripartite Split-sfGFP for the Study of Membrane Protein-Protein Interactions

Area of Science:

• Molecular Biology
• Cell Biology
• Biochemistry

Background:

• Protein-protein interactions (PPI) are fundamental to cellular processes.
• Conventional biomolecular fluorescence complementation (BiFC) visualizes PPI but suffers from high background noise due to irreversible fragment assembly.
• A novel tripartite split-sfGFP method offers improved detection of membrane PPIs in plant cells with reduced spurious signals.

Purpose of the Study:

• To present a protocol for a ß-Estradiol-inducible tripartite split-sfGFP assay.
• To enable simultaneous analysis of in vivo PPI and in situ subcellular localization.
• To validate the method in agroinfiltrated Nicotiana benthamiana leaves.

Main Methods:

• Utilized a tripartite split-sfGFP system for protein interaction studies.
• Employed ß-Estradiol induction for temporal control of protein expression.
• Applied agroinfiltration for transient expression in Nicotiana benthamiana.

Main Results:

• The tripartite split-sfGFP assay effectively detected membrane PPIs in plant cells.
• The method demonstrated minimal background noise, even with high fusion protein expression.
• Simultaneous visualization of PPI and subcellular localization was achieved.

Conclusions:

• The ß-Estradiol-inducible tripartite split-sfGFP assay is a robust tool for studying PPI in plants.
• This method overcomes limitations of traditional BiFC, offering enhanced specificity and sensitivity.
• It facilitates comprehensive analysis of protein interactions and localization dynamics in living plant cells.