The fluorescent protein Kaede gene was isolated from the stony coral Trachyphylia geoffroyi (Hiyu-sango in Japanese).
Kaede means maple leaf in Japanese. CoralHue™ Kaede protein emits bright green fluorescence that can irreversibly convert to red. The red fluorescence is comparable in intensity to the green and is stable under usual aerobic conditions. The green-to-red conversion is highly sensitive to irradiation with UV or violet light (350-410 nm). Maximal illumination results in a 2,000-fold increase in the ratio of red-to-green signaling. The excitation lights used to elicit red or green fluorescence do not induce the photoconversion.
This property provides a simple and powerful technique for regional optical marking.
Cell (Ref.2,3), organelle (Ref.4) or protein dynamics (Ref.5,6) have been reported.
Irradiation with UV to Kaede expressing cells converts the green fluorescence to red, which leads to the diffusion of red colored Kaede throughout the Kaede expressing cell. The photoconversion can be induced gradually by intermittent irradiation.
Expression of CoralHue™ Kaede in neurons.
Without irradation with UV, Kaede protein emits green fluorescence which visualize the morphology of neurons (Left). Irradation with UV to the cell body of one neuron elicits the green-to-red fluorescence conversion specifically in the irradiated cell, by which neighboring neurons can be distingueshed by color (Right).
(Images are provided by Dr. Miyawaki Atsushi, Laboratory for Cell Function and Dynamics, BSI, RIKEN)
|Kaede spectrum data files (text files)|
|Kaede-green excitation (8K)||Kaede-green emission (8K)|
|Kaede-red excitation (16K)||Kaede-red emission (8K)|
Note: The file is in a tab-delimited text format. It contains values of the wavelength (0.5nm spacing) and brightness (fluorescence intensity peak value normalized to 1). Use a spreadsheet program to create a spectrum that will help you in choosing the appropriate excitation filter, dichroic mirror and fluorescence filter.
Filter set for Kaede is available from Opto Science, Inc.
|Set No.||Filter set for Kaede recommended by OMEGA OPTICAL||Components||Part #||Filer models|
||Green to Red Conversion
Exciter - Red
Exciter - Green
Emitter - Red
Emitter - Green
Conversion Exciter - UV R to G
Conversion Dichroic - UV R to G
※For further information, please see Opto Science, Inc. webpage
|CHARACTERISTIC||CoralHue™ Kaede||CoralHue™ Kaede
|Number of amino acid||225||225|
|Excit./Emiss. maxima (nm)||508 / 518||572 / 580|
|Molar extinction coefficient (M-1cm-1)||98,800 (508 nm)||60,400 (572 nm)|
|Fluorescence quantum yield||0.88||0.33|
*1Brightness: Molar Extinction Coefficient ×Fluorescence Quantum Yield / 1000
*2Toxicity when expressed in HeLa cells
The Kaede transgenic mouse was developed by Dr. Miwa (Ref.2). Kaede is a photoconvertible fluorescence protein that changes from green to red upon exposure to violet light. The photoconversion of intracellular Kaede has no effect on cellular function. Thus, Cell dynamics can be monitored with the photoconverted Kaede protein.
Provided by Dr.Y. Miwa
Department of Molecular Pharmacology, Graduate School of Comprehensive Human Sciences, University of Tsukuba
Visualization of cell movements and the tracing of neuronal shapes using Kaede transgenic zebrafish (Ref.3)
CoralHue™ Kaede can be recognized using antibodies as shown below.
WB: Western blotting, IP: Immunoprecipitation
※CoralHue™ fluorescent proteins were co-developed with the Laboratory for Cell Function and Dynamics, the Advanced Technology Development Center, the Brain Science Institute, RIKEN. MBL possesses the license and deals in the products.
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