Biosensors of DsRed as FRET partner with CFP or GFP for quantitatively imaging induced activation of Rac, Cdc42 in living cells
| Autor: | Daoquan Ren, Yizhou Liu, Yuting Deng, Bin Sun, Qingyan Zhang, Xiangrong Guo, Rushi Liu |
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| Rok vydání: | 2010 |
| Předmět: |
Yellow fluorescent protein
Cancer Research Time Factors Cell Survival Green Fluorescent Proteins macromolecular substances Biosensing Techniques Bradykinin Transfection Fluorescence spectroscopy Green fluorescent protein Bimolecular fluorescence complementation Mice Fluorescence Resonance Energy Transfer Animals Guanine Nucleotide Exchange Factors Humans Insulin Radiology Nuclear Medicine and imaging cdc42 GTP-Binding Protein biology Chemistry fungi GTPase-Activating Proteins Molecular Imaging rac GTP-Binding Proteins Enzyme Activation Luminescent Proteins Protein Transport Förster resonance energy transfer Oncology Biochemistry biology.protein Biophysics NIH 3T3 Cells Guanosine Triphosphate Molecular imaging Biosensor |
| Zdroj: | Molecular imaging and biology. 13(3) |
| ISSN: | 1860-2002 |
| Popis: | The suboptimal features of the spectral properties of the leading fluorescence resonance energy transfer (FRET) pair, cyan fluorescent protein (CFP)/yellow fluorescent protein (YFP), limit the full promise of FRET imaging. To overcome the drawbacks, we developed FRET-based, intra-molecular biosensors consisting of CFP/discomona sp red fluorescent protein (DsRed) or green fluorescent protein (GFP)/DsRed as donor/acceptor fluorophores. The biosensors were expressed in NIH3T3 cells. In vitro fluorescence spectroscopy and Rho GTPase activation assays were used to confirm that Rac1 or Cdc42 was activated in serum-starved cells following stimulation with insulin or bradykinin. The transient changes of the amount, location, and translocation of activated Rac1 or Cdc42 in living cells were tracked with confocal imaging. The increase of FRET efficiency was achieved in the cells expressing the biosensors and was proportional to the levels of activated Rac1 or Cdc42. The localized, transitional, and transient FRET signals were directly and quantitatively imaged with high spatial and temporal resolution. The biosensors were used to analyze and judge the GEF or GAP activities of putative regulatory proteins for Rac1 or Cdc42. DsRed is a more suitable acceptor in FRET pair with CFP than with GFP in terms of the spectral overlap between the donor and acceptor. The approach can also be applied to many other types of protein behavior in living cells. |
| Databáze: | OpenAIRE |
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