Abstract
The analyses of protein-protein interactions are crucial for understanding cellular processes including signal transduction, protein trafficking, and movement. Protein fragment complementation assays are based on the reconstitution of protein function when non-active protein fragments are brought together by interacting proteins that were genetically fused to these protein fragments. Bimolecular fluorescence complementation (BiFC) relies on the reconstitution of fluorescent proteins and enables both the analysis of protein-protein interactions and the visualization of protein complex formations in vivo.
Transient expression of proteins is a convenient approach to study protein functions in planta or in other organisms and minimizes the need for time-consuming generation of stably expressing transgenic organisms. Here we describe protocols for BiFC analyses in Nicotiana benthamiana and Arabidopsis thaliana leaves transiently transformed by Agrobacterium infiltration. Further, we discuss different BiFC applications and provide examples for proper BiFC analyses in planta.
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Abbreviations
- BiFC:
-
Bimolecular fluorescence complementation
- BiLC:
-
Bimolecular luminescence complementation
- BRET:
-
Bioluminescence resonance energy transfer
- CBB:
-
Coomassie brilliant blue
- CFP:
-
Cyan FP
- coBiFC:
-
Co-localization of BiFC complexes
- ECL:
-
Enhanced chemiluminescence
- FP:
-
Fluorescent protein
- FPC :
-
FP C-terminal fragment
- FPN :
-
FP N-terminal fragment
- FRET:
-
Fluorescence resonance energy transfer
- GFP:
-
Green FP
- iBiSC:
-
Isolation of BiFC-stabilized complexes
- mcBiFC:
-
Multicolor BiFC
- OD600 :
-
Optical density at 600 nm
- PCA:
-
Protein fragment complementation assay
- PPI:
-
Protein-protein interaction
- PVDF:
-
Polyvinylidene fluoride
- RFP:
-
Red FP
- RLuc:
-
Renilla reniformis luciferase
- SUS:
-
Split-ubiquitin system
- TEV:
-
Tobacco etch virus protease
- UbFC:
-
Ubiquitin-mediated fluorescence complementation
- Y2H:
-
Yeast-two-hybrid
- YFP:
-
Yellow FP
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Acknowledgements
We thank Alex Costa for critical suggestions with the Arabidopsis infiltration protocol, Katrin Held for providing the YC-ABI1 construct, and Jan Niklas Offenborn for providing the OST1 construct. This work was supported by a Feodor Lynen fellowship from the Alexander von Humboldt-Foundation to R.W., a National Institutes of Health grant R01GM060396 and a National Science Foundation grant MCB0918220 to J.I.S., and grants from the DFG (SFB629 and FOR964) to J.K.
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Waadt, R., Schlücking, K., Schroeder, J.I., Kudla, J. (2014). Protein Fragment Bimolecular Fluorescence Complementation Analyses for the In vivo Study of Protein-Protein Interactions and Cellular Protein Complex Localizations. In: Sanchez-Serrano, J., Salinas, J. (eds) Arabidopsis Protocols. Methods in Molecular Biology, vol 1062. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-62703-580-4_33
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