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Imaging Protein-protein Interactions in vivo
Published on: October 10, 2010
Ma-PbFRET: multiple acceptors FRET measurement based on partial acceptor photobleaching
Huaina Yu1, Jianwei Zhang, Huali Li
1MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
Summary
A new method, multiple acceptors PbFRET (Ma-PbFRET), accurately measures Förster resonance energy transfer (FRET) efficiency in constructs with multiple acceptors. This technique is valuable for studying large biomolecular complex assembly in living cells.
Area of Science:
- Biophysics
- Molecular Biology
- Biochemistry
Background:
- Partial photobleaching FRET (PbFRET) is a simple method for measuring FRET efficiency.
- Existing PbFRET methods cannot analyze constructs with multiple acceptors, limiting their application for larger Förster distances.
Purpose of the Study:
- To develop a novel method for quantifying FRET efficiency in constructs with multiple acceptors.
- To extend the applicability of PbFRET to complex biomolecular systems.
Main Methods:
- Developed a linear theory for acceptor photobleaching probability in multi-acceptor systems.
- Created the multiple acceptors PbFRET (Ma-PbFRET) method to measure FRET efficiency.
- Validated Ma-PbFRET in living cells using constructs with two or three acceptors.
Main Results:
- Ma-PbFRET accurately quantifies FRET efficiency in constructs with multiple acceptors.
- The method is effective across varying degrees of acceptor photobleaching.
- Experimental validation confirmed the method's precision in living cells.
Conclusions:
- Ma-PbFRET provides a simple and powerful tool for analyzing biomolecular complex assembly and disassembly.
- Enables investigation of molecular interactions over larger distances in vivo.
- Overcomes limitations of previous FRET methods for multi-acceptor systems.
