WO2006051944A1 - 蛍光蛋白質 - Google Patents
蛍光蛋白質 Download PDFInfo
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- WO2006051944A1 WO2006051944A1 PCT/JP2005/020843 JP2005020843W WO2006051944A1 WO 2006051944 A1 WO2006051944 A1 WO 2006051944A1 JP 2005020843 W JP2005020843 W JP 2005020843W WO 2006051944 A1 WO2006051944 A1 WO 2006051944A1
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- fluorescent protein
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
- G01N33/5008—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics
- G01N33/502—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics for testing non-proliferative effects
- G01N33/5035—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics for testing non-proliferative effects on sub-cellular localization
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/43504—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from invertebrates
- C07K14/43595—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from invertebrates from coelenteratae, e.g. medusae
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/536—Immunoassay; Biospecific binding assay; Materials therefor with immune complex formed in liquid phase
- G01N33/542—Immunoassay; Biospecific binding assay; Materials therefor with immune complex formed in liquid phase with steric inhibition or signal modification, e.g. fluorescent quenching
Definitions
- the present invention relates to a novel fluorescent protein. More specifically, the present invention relates to a wavelength-converted fluorescent protein using light irradiation-dependent fluorescence energy transfer and a background art relating to the use thereof
- Green fluorescent protein (GFP) derived from the jellyfish Aequorea victoria has many uses in biological systems. Recently, based on random mutagenesis and semi-rational mutagenesis, various color changes, improved folding properties, increased brightness, or altered pH sensitivity GFP mutants have been created. Other proteins are fused to fluorescent proteins such as GFP by genetic recombination technology, and their expression and transport are monitored.
- YFP yellow fluorescent protein
- YFP exhibits the longest wavelength fluorescence among Aequorea GFP mutants.
- the ⁇ and ⁇ of most YFPs are 60,000 to 100,000 M—m— 1 and 0.6 to 0.8, respectively (Tsien, RY (1998). Ann. Rev. Biochem. 67, 509-544), and these values Is comparable to that of common fluorophores (such as fluorescein and rhodamine).
- Another example of a GFP mutant is cyan fluorescent protein (CFP), and ECFP (enhanced cyan fluorescent protein) is known.
- CFP cyan fluorescent protein
- ECFP enhanced cyan fluorescent protein
- RFP red fluorescent protein
- DasRed is known. In this way, four types of fluorescent proteins, green, yellow, cyan, and red, have been developed one after another, and the spectrum range has been greatly expanded.
- PA-GFP Purge GH and Lipp incott- Schwartz J, Science 297, 1873-1877 (2002)
- kaede Ando R et al, Proc. Natl .Acad.Sci.USA 99, 12651-12656 (2002).
- PA-GFP has a problem that it is difficult to divide where the specimen is before the stimulation light irradiation because of the characteristic that fluorescence appears even in the non-fluorescent state force.
- kaede is converted from green to red by stimulating light irradiation, but it is complicated because it requires excitation light according to both colors, and kaede is linked to an arbitrary protein to form a tetramer. It was not suitable for dynamic observation.
- the present invention makes it possible to label an arbitrary organelle, cell, or tissue in multiple colors by expressing a fluorescence resonance energy transfer (FRET) acceptor in a stimulus light-dependent manner.
- FRET fluorescence resonance energy transfer
- the present inventors have fused a donor fluorescent protein capable of emitting fluorescence with different wavelengths and an acceptor fluorescent protein, and excited the donor protein before light stimulation.
- the donor protein can fluoresce, and after light stimulation, irradiation with excitation light of the donor protein causes intramolecular FRET between the donor fluorescent protein and the acceptor fluorescent protein, resulting in an acceptor.
- the fluorescence spectrum of a fluorescent protein can be changed in a stimulating light-dependent manner by constructing a fluorescent protein that can emit fluorescence.
- the present invention has been completed based on these findings.
- the fusion protein power of the donor fluorescent protein and the acceptor fluorescent protein is formed, and the donor protein emits fluorescence by irradiating the excitation light of the donor protein before the stimulation light irradiation.
- irradiation of excitation light of the donor protein causes intramolecular FRET to occur between the donor fluorescent protein and the acceptor fluorescent protein, allowing the acceptor protein to fluoresce, and the donor protein
- a fluorescent protein characterized in that the fluorescence and the fluorescence of the acceptor protein are fluorescence having different wavelengths.
- the donor fluorescent protein is a CFP mutant
- the acceptor fluorescent protein is P A— GFP mutant.
- the stimulation light is ultraviolet light or violet light.
- the donor fluorescent protein is a CFP variant lacking the C-terminal 11 amino acids of CFP
- the acceptor fluorescent protein is a PA-GFP variant lacking the N-terminal 3 amino acids of PA-GFP. It is.
- the donor fluorescent protein and the acceptor fluorescent protein are fused via a linker sequence.
- the fluorescent protein of the present invention has any of the following amino acid sequences.
- a transformant having the above-described DNA or recombinant vector of the present invention is provided.
- a fused fluorescent protein comprising the above-described fluorescent protein of the present invention and another protein.
- a method for analyzing the localization or dynamics of a protein in a cell characterized by expressing the above-described fused fluorescent protein of the present invention in the cell.
- a fluorescent reagent kit comprising the fluorescent protein, DNA, recombinant vector, transformant, or fusion fluorescent protein of the present invention described above. Best form
- Fluorescent protein of the present invention has a fusion protein strength between a donor fluorescent protein and an acceptor fluorescent protein, and the donor protein can emit fluorescence by irradiating the excitation light of the donor protein before the stimulation light irradiation. After irradiation, irradiation with excitation light of the donor protein causes intramolecular FRET to occur between the donor fluorescent protein and the acceptor fluorescent protein, allowing the acceptor protein to fluoresce. It is a fluorescent protein characterized in that the fluorescence of the acceptor protein is different in wavelength.
- the combination of the donor fluorescent protein and the acceptor fluorescent protein used in the present invention is not particularly limited as long as the effect of the fluorescent protein of the present invention described above can be achieved.
- the donor fluorescent protein and acceptor fluorescent protein include cyan fluorescent protein (CFP), yellow fluorescent protein (YEP), green protein (GFP), red fluorescent protein (REP), blue fluorescent protein (BFP), or their fluorescent dyes. Mutants can be used.
- cyan fluorescent protein, yellow fluorescent protein, green protein, red fluorescent protein, blue fluorescent protein or variants thereof are not only known fluorescent proteins, but also variants thereof (for example, all of ECFP, EYFP, EGFP, ERFP, EBFP, etc. that have enhanced the fluorescence intensity of the fluorescent protein are included.
- the gene for green fluorescent protein has been isolated and sequenced (Prasher, DC et al. (1992), "Primary struture of the Aequorea victoria green fluorescent protein, uene 111: 229-23"). Numerous amino acid sequences of proteins or their variants have been reported, and are described, for example, in Roger Y. Tsien, Annu. Rev. Biochem. 1998. 67: 509-44, and the references cited therein.
- GFP yellow fluorescent protein
- YFP yellow fluorescent protein
- a mutant thereof for example, those derived from Ewan jellyfish (for example, Aequorea victoria) can be used.
- the nucleotide sequence of the gene encoding the fluorescent protein used in the present invention is known.
- a commercially available gene can be used as the gene encoding the fluorescent protein.
- EGFP vector, EYFP vector, ECFP vector, EBF p vector, etc. commercially available from Clontech can be used.
- the donor fluorescent protein is a CFP variant and the acceptor fluorescent protein is a PA-GFP variant.
- a protein that converts from cyan to green-yellow in a stimulus light-dependent manner is prepared by using CFP and PA-GFP as a FRET donor and acceptor, respectively. succeeded in. Specifically, a CFP mutant lacking 11 C-terminal amino acids of CFP was used as the donor fluorescent protein, and the N-terminal 3 amino acids of PA-GFP were deleted as the acceptor fluorescent protein. Using PA-GFP mutant
- the donor protein emits fluorescence by irradiating the excitation light of the donor protein before the stimulation light irradiation, and the donor fluorescence is emitted by irradiating the excitation light of the donor protein after the stimulation light irradiation.
- the acceptor protein emits fluorescence.
- the stimulating light used here is preferably ultraviolet light or violet light.
- the irradiation time of ultraviolet light or violet light is not particularly limited. For example, force of several milliseconds can be performed for about 10 minutes.
- the donor fluorescent protein and the acceptor fluorescent protein may be fused via a linker sequence.
- a linker sequence for example, about 1 to 5 amino acid sequences are listed as a linker sequence.
- fluorescent protein of the present invention include:
- the amino acid sequence of SEQ ID NO: 2 has an amino acid sequence having a deletion, substitution and Z or addition of one to several amino acids, and a fusion protein power of a donor fluorescent protein and an acceptor fluorescent protein Therefore, the donor protein can emit fluorescence by irradiating the excitation light of the donor protein before the stimulation light irradiation, and after the stimulation light irradiation, the donor fluorescent protein and acceptor fluorescence can be emitted by irradiating the excitation light of the donor protein.
- the acceptor protein can fluoresce, and the fluorescence of the donor protein and the acceptor protein are mutually different in fluorescence.
- the range of "1 to several” in the "amino acid sequence having 1 to several amino acid deletions, substitutions, and Z or addition” as used herein is not particularly limited. It means 1 to 20, preferably 1 to 10, more preferably 1 to 7, more preferably 1 to 5, particularly preferably about 1 to 3.
- the donor protein can emit fluorescence (480 nm) by irradiating the excitation light (458 nm) of the donor protein before irradiation with the stimulating light (400 nm), and after irradiation with the stimulating light (400 nm), By irradiation with excitation light (458 nm), intramolecular FRET is generated between the donor fluorescent protein and the acceptor fluorescent protein, whereby the acceptor protein can emit fluorescence (520 nm).
- the method for obtaining the fluorescent protein of the present invention may be a protein synthesized by chemical synthesis with no particular restriction, or may be a recombinant protein produced by a gene recombination technique.
- a DNA encoding a fluorescent protein In the case of producing a recombinant protein, it is necessary to first obtain a DNA encoding a fluorescent protein.
- the amino acid sequences and base sequences of various fluorescent proteins used as donor fluorescent proteins and acceptor fluorescent proteins are known to those skilled in the art, and the DNA that codes them can be obtained from commercial products, PCR, etc.
- the usual genetic recombination method can be used for crawling.
- the DNA encoding the fluorescent protein of the present invention can be constructed by sequentially linking the DNA encoding the donor fluorescent protein and the acceptor fluorescent protein obtained in this way by a gene recombination technique.
- the fluorescent protein of the present invention can be produced by introducing this DNA into an appropriate expression system. The expression in the expression system will be described later in this specification.
- DNA encoding the fluorescent protein of the present invention is provided.
- Examples of DNA encoding a fluorescent protein having the amino acid sequence set forth in SEQ ID NO: 2 include DNA having the base sequence set forth in SEQ ID NO: 1. Further, in the base sequence described in SEQ ID NO: 1, it is a DNA having a base sequence having deletion, substitution and Z or addition of one to several bases, and having the characteristics described above in the present specification. DNA encoding a fluorescent protein is also included within the scope of the present invention.
- the range of "1 to several” in the "base sequence having deletion, substitution and Z or addition of one to several bases” as used in the present specification is not particularly limited. It means 50, preferably 1 to 30, more preferably 1 to 20, more preferably 1 to 10, particularly preferably about 1 to 5.
- the DNA of the present invention can be synthesized, for example, by the phosphoramidite method or the like, or can be produced by polymerase chain reaction (PCR) using a specific primer.
- PCR polymerase chain reaction
- the method for producing the DNA of the present invention or a fragment thereof is as described above in the present specification.
- DNA having mutations can be constructed by appropriately using known techniques such as site-directed mutagenesis, PCR using degenerate oligonucleotides, mutagenesis of nucleic acid-containing cells, or exposure to radiation. can do.
- known techniques include, for example, Molecular Cloning: A laboratory Mannual, 2 ti, d., Old bpnng Harbor Laboratory, Cold
- the DNA of the present invention can be used by inserting it into an appropriate vector.
- the type of the vector used in the present invention is not particularly limited.
- the vector may be a self-replicating vector (for example, a plasmid), or may be incorporated into the genome of the host cell when introduced into the host cell. It can be replicated along with the chromosomes.
- the vector used in the present invention is an expression vector.
- the DNA of the present invention is functionally linked to elements necessary for transcription (for example, a promoter and the like).
- a promoter is a DNA sequence that exhibits transcriptional activity in a host cell and Depending on the class, it can be appropriately determined.
- Bacillus' steer opening thermophilus' Ma Noreton'enikku- ⁇ off 1 ⁇ IT heritage is the child (Bacillusstearothermophilus maltogenic amylase gen e) ⁇ Roh Tenoresu 'Rikenihonore ⁇ scan ⁇ A ⁇ Fuse Bacillus licheniformis alpha-amylase gene, Bacillus amyloliquefa ciens BAN amylase gene, Bacillus subtilis alkaline protease gene or Bacillus pumilus xylosidase Promoter of gene (Bacillus pumilus xylosldase gene) or phage 'P
- Examples of promoters that can operate in mammalian cells include the SV40 promoter, the MT-1 (meta oral thionein gene) promoter, or the adenovirus 2-main late promoter.
- Examples of promoters that can operate in insect cells include polyhedrin promoter, P10 promoter, autographer 'Califor-force' polyhedrosic basic protein promoter, Baki eurovirus immediate early gene 1 promoter, or Bakiurovirus 39K. There are delayed early gene promoters.
- Examples of a promoter operable in a yeast host cell include a promoter derived from a yeast glycolytic gene, an alcohol dehydrogenase gene promoter, a TPI1 promoter, and an ADH2-4C promoter.
- promoters that can operate in filamentous fungal cells include the ADH3 promoter or the tpiA promoter.
- the DNA of the present invention may be operably linked to an appropriate terminator such as TPI1 terminator or ADH3 terminator for human growth hormone terminator or, for fungal hosts, as necessary.
- the recombinant vector of the present invention further comprises a polyadenylation signal (eg, derived from the SV40 or adenovirus 5Elb region), a transcriptional enhancer sequence (eg, SV40 antigen), and a translational enhancer sequence (eg, adenovirus VA RNA). ) May be included.
- the recombinant vector of the present invention may further comprise a DNA sequence that allows the vector to replicate in the host cell.
- the SV40 origin of replication when the host cell is a mammalian cell.
- the recombinant vector of the present invention may further contain a selection marker.
- Selectable markers include, for example, genes whose complement is lacking in the host cell, such as dihydrofolate reductase (DHFR) or Schizosaccharomyces pompi TPI gene, or for example ampicillin, kanamycin, tetracycline, chloramphenic acid. Mention may be made of drug resistance genes such as cole, neomycin or hygromycin.
- a transformant can be prepared by introducing the DNA or recombinant vector of the present invention into an appropriate host.
- Examples of host cells into which the DNA or recombinant vector of the present invention is introduced include bacteria, yeasts, fungi, and higher eukaryotic cells that can be used in any cell as long as the DNA construct of the present invention can be expressed.
- Examples of bacterial cells include Gram-positive bacteria such as Bacillus or Streptomyces, or Gram-negative bacteria such as Escherichia coli. Transformation of these bacteria may be carried out by using a competent cell by a protoplast method or a known method.
- mammalian cells examples include HEK293 cells, HeLa cells, COS cells, BHK cells, CHL cells, or CHO cells. Methods for transforming mammalian cells and expressing the DNA sequences introduced into the cells are also known, and for example, the electopore method, the calcium phosphate method, the lipofuxion method and the like can be used.
- yeast cells include cells belonging to Saccharomyces or Schizosaccharomyces, such as Saccharomyces cerevislae or Saccharomyces kluyveri.
- Examples of the method for introducing the recombinant vector into the yeast host include the electopore position method, the sphere blast method, and the lithium acetate method.
- Examples of other fungal cells are those belonging to filamentous fungi such as Aspergillus, Neurospora, Fusarium, or Trichoderma.
- Transformation can be performed by integrating the A construct into the host chromosome to obtain a recombinant host cell. Integration of the DNA construct into the host chromosome can be performed according to known methods, for example, by homologous recombination or heterologous recombination.
- a recombinant gene transfer vector and a baculovirus are co-introduced into the insect cell to obtain the recombinant virus in the insect cell culture supernatant, and then the recombinant virus is further used. It can infect insect cells and express proteins (eg, Baculovirus Expression Vectors, A Laboratory Manual; and 7 Lund'Foot Mouth ⁇ Loose 'in' Molecular ⁇ ⁇ Biology, Bio / Technology, 6, 47 (1988)).
- the baculovirus can be, for example, an autographa californica nuclear polyhedrosis virus or the like, which is a virus that infects Drosophila insects, such as Autographa californica nuclear polyhedrosis virus; .
- Insect cells include Spodoptera frugiperda's ovarian cells Sf9, Sf21 [Baculovirus. Expression. Vectors, Laboratories ⁇ ⁇ Mual, W ⁇ H. Freeman & Campa. w. H. F reeman and Company) , New York (New York), (1992) ],! use the ovarian cell of Trichoplusia ni HiFive (manufactured by Invitrogen), and the like /, can Rukoto.
- Examples of the method for co-introducing a recombinant gene introduction vector into insect cells and the baculovirus for preparing a recombinant virus include the calcium phosphate method and the lipofusion method.
- the transformant is cultured in an appropriate nutrient medium under conditions that allow expression of the introduced DNA construct.
- ordinary protein isolation and purification methods may be used.
- the protein of the present invention when expressed in a dissolved state in the cells, the cells are collected by centrifugation after culturing and suspended in an aqueous buffer, and then the cells are removed by an ultrasonic crusher or the like. Crush to obtain a cell-free extract.
- an ordinary protein isolation and purification method that is, a solvent extraction method, a salting-out method using ammonium sulfate, a desalting method, a precipitation method using an organic solvent, Anion exchange chromatography using resin such as Jetylaminoethyl (DEAE) Sepharose, S-Sepharose FF (manufactured by Pharmacia), etc. Cation exchange chromatography using resin, hydrophobic chromatography using resin such as butyl sepharose and phenyl sepharose, gel filtration using molecular sieve, affinity chromatography, chromatofocusing, etc.
- a purified sample can be obtained by using methods such as electrophoretic methods such as electric point electrophoresis alone or in combination.
- a fusion protein can be constructed by fusing the fluorescent protein of the present invention with another protein.
- the method for obtaining the fusion protein of the present invention may be a protein synthesized by chemical synthesis with no particular restriction, or may be a recombinant protein produced by a gene recombination technique.
- DNA encoding the fluorescent protein of the present invention can be obtained.
- DNA fragment that encodes the protein to be fused are sequentially ligated by a gene recombination technique to obtain a DNA encoding a desired fusion protein.
- the fusion protein of the present invention can be produced.
- the fluorescent protein of the present invention is particularly useful as a label. That is, if the fluorescent protein of the present invention is purified as a fusion protein with a test amino acid sequence, introduced into a cell by a technique such as microinjection, and the distribution of the fusion protein is observed over time, the test amino acid It is possible to detect the targeting activity of the sequence in the cell.
- the type of other protein (test amino acid sequence) to which the fluorescent protein of the present invention is fused is not particularly limited. For example, it is specific to a protein localized in a cell or an intracellular organelle. Suitable proteins, targeting signals (eg, nuclear translocation signals, mitochondrial pre-sequences) and the like are suitable.
- the fluorescent protein of the present invention can be expressed in a cell and used in addition to being introduced into the cell by a microinjection method or the like. This In this case, a vector into which the DNA encoding the fluorescent protein of the present invention has been inserted is introduced into the host cell.
- the fluorescent protein of the present invention can also be used as a reporter protein for measuring promoter activity. That is, a vector in which the DNA encoding the fluorescent protein of the present invention is arranged downstream of the test promoter is introduced into a host cell, and the fluorescence of the fluorescent protein of the present invention generated by the cell force is detected. Thus, the activity of the test promoter can be measured.
- the test promoter is not particularly limited as long as it functions in the host cell.
- the vector used for detection of the targeting activity of the test amino acid sequence and measurement of the promoter activity is not particularly limited.
- pNEO P. Southern , and P. Berg (1982) J. MOl. Appl. Genet. 1: 327
- p CAGGS H. Niwa'K. Yamamura'and J. Miyazaki. Gene 108,193—200 (1991)
- pRc / C MV (manufactured by Invitrogen),”
- pCDM8 (manufactured by Invitrogen), etc.
- yeast vectors are the yeast vectors" pRS303 “,” pRS304 “,” pRS305 “,” pRS306 “,” pRS313 “,” pRS314 “ ”,“ PRS315 ”, [pR S316] (RSSikorski and P. Hieter (1989) Genetics 122: 19-27),“ pRS423 ”,“ pRS424 ”,“ pRS425 ”,“ pRS426 ”(TWChristianson, RSSikorski, M. Dante, JHShero, and P. Hieter (1992) Gene 110: 119-122) are preferably used.
- the types of cells that can be used are not particularly limited, and various animal cells such as L cells, BalbC-3T3 cells, NIH3T3 cells, CHO (Chinese hamster ovary) cells, HeLa cells, NRK (normal) rat kidney) cells, yeast cells such as “Saccharomyces cerevisiae”, and E. coli cells can be used.
- Introduction of a vector into a host cell can be performed by a conventional method such as the calcium phosphate method or the electopore position method.
- a fusion fluorescent protein obtained by fusing the fluorescent protein of the present invention and another protein (referred to as protein X) obtained as described above is expressed in cells, and the emitted fluorescence is monitored. It becomes possible to analyze the localization and dynamics of protein X in the cell. That is, by observing cells transformed or transfected with DNA encoding the fusion fluorescent protein of the present invention with a fluorescence microscope, the localization and dynamics of protein X in the cells can be visualized and analyzed. [0056] For example, by using a protein specific to intracellular organelles as protein X, the distribution and movement of nuclei, mitochondria, endoplasmic reticulum, Golgi apparatus, secretory vesicles, peroxosome, etc. can be observed.
- neuronal axons and rod-like processes show remarkably complex movement changes in the developing individuals, so dynamic analysis can be easily performed by fluorescently labeling these sites. Become.
- the fluorescence of the fluorescent protein of the present invention can be detected as it is in living cells. This detection can be performed using, for example, a fluorescence microscope (Axio Photo Filter Set 09, Carl Zeiss) or an image analyzer (ATTO digital image analyzer).
- the type of the microscope can be appropriately selected according to the purpose.
- a normal epi-illumination fluorescence microscope is preferable.
- a confocal laser microscope is preferable when focusing on resolution, such as when pursuing detailed localization in a cell.
- an inverted microscope is preferable from the viewpoint of maintaining the physiological state of the cells and preventing contamination.
- a water immersion lens can be used when using a high magnification lens.
- An appropriate filter set can be selected according to the fluorescence wavelength of the fluorescent protein.
- a high-sensitivity cooled CCD camera should be used because it should be taken in a short time. Cooling The CCD camera can cool the CCD to reduce thermal noise and capture a weak fluorescent image clearly in a short exposure.
- kits are provided for analysis and / or analysis of bioactive substances.
- the kit of the present invention can be prepared by commonly used materials and techniques known per se.
- Reagents such as fluorescent protein or DNA can be prepared in a form suitable for storage by dissolving in a suitable solvent.
- a suitable solvent water, ethanol, various buffers, etc. are used. It is possible to be.
- Example 1 Phamret gene construction
- pEGFP-N1 (Clontech) and pECFP-N1 (Clontech) in a saddle type, 5'-ATTGGATCCCACCATGGTGAGCAAGGGCGAG-3 '(SEQ ID NO: 3) and 5,-GCA GAATTCTTACTTGTACAGCTCGTCCATG-3' (SEQ ID NO: 4) as primers PCR was performed, and the PCR product was cleaved with restriction enzymes BamHI and EcoRI and inserted into the BamHI-EcoRI site of pRSETB to construct EGFP / pRSETB and ECFP / pRSETB, respectively.
- PA-GFP gene was also constructed with reference to literature (Patterson and Lippincott-Schwartz Science 297, 1873-1877, 2002) and EGFP gene strength.
- literature Patent and Lippincott-Schwartz Science 297, 1873-1877, 2002
- EGFP gene strength To replace EGFP protein 64th leucine with ferralanin, 65th threonine with serine, 203rd threonine with histidine, and 206th alanine with lysine, the following 3 Mutation was carried out by the method described in the literature (Sawano and Miyawaki Nucleic Acids Res. 28: E78, 2000) using two primers.
- mSECFP / pRSETB is used as a saddle, 5,-ATTGGATCCCACCATGGTGAGCAAGG GCGAG-3 '(SEQ ID NO: 3), 5,-CGGGGTACCGGCGGCGGTCACGAACTCCAG-3, PCR was performed using (SEQ ID NO: 11) as a primer, and the PCR product was cleaved with restriction enzymes BamHI and Kpnl, and inserted into the BamHI-Kpnl site of PRSETB (mSEGFPdCll / pRSETB).
- PCR was performed using PA-GFP / pRSETB as a saddle, 5, -CGGGGTACCAAGGGCGAGGAGCTGTTCA CC-3, (SEQ ID NO: 12), 5'-GCAGAATTCTTACTTGTACAGCTCGTCCATG-3 '(SEQ ID NO: 4) as a primer,
- the PCR product was cleaved with restriction enzymes Kpnl and EcoRI, and inserted into the Kpnl-EcoRI site of mSEGFPdCll / pRSETB to construct Phamret / pRSETB.
- the nucleotide sequence of the fluorescent protein Phamret of the present invention is shown in SEQ ID NO: 1 in the sequence listing, and the amino acid sequence is shown in SEQ ID NO: 2 in the sequence listing.
- Phamret / pRSETB was cut with BamHI and EcoRI and inserted into the BamHI-EcoRI site of pcDNA3 to construct Phamret / pcDNA3.
- Figure 1 shows the structure of Pha mret.
- HeLaS3 cells were thawed and stored in a 10 cm plastic dish by freezing. Two days later, five 3xl0 pieces were spread on a 35 mm glass bottom dish that had been dispersed and collagen-coated by trypsin treatment. After 24 hours, the medium was replaced with Hank's balanced salt solution, and a color conversion experiment was performed under a microscope. Olympus FV1000 confocal laser microscope was used for the microscope, and PLANApo x60 NA1.2 Water was used for the objective lens.
- Phamret is excited with a multi-Argon laser 458 nm line (maximum output 3 mW) laser light (laser power 2%), and two fluorescences of 470 to 500 nm (donor channel) and 510 to 560 nm (acceptor channel) are simultaneously emitted. I got it. Before 405 nm laser light irradiation, the donor channel has strong fluorescence ( Figures 2A and 2D), while 405 nm laser light (maximum output 25 mW) is 1.2% When irradiating the cytoplasm (circle 1) with one power, Phamret quickly changed color and fluorescence of the receptor channel became stronger (Fig. 2B, C).
- Example 4 FRET efficiency from mSECFP to PA-GFP in Phamret after discoloration
- FIG. 1 shows a structural schematic diagram of Phamret.
- FIG. 2 shows color conversion of Phamret-expressing HeLa cells by light stimulation.
- FIG. 3 shows spectra before and after Phamret color conversion.
- FIG. 4 shows a schematic diagram of the structure and characteristics of Phamret.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/719,166 US8013119B2 (en) | 2004-11-15 | 2005-11-14 | Fluorescent protein |
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JP2004-330267 | 2004-11-15 | ||
JP2004330267A JP4557685B2 (ja) | 2004-11-15 | 2004-11-15 | 蛍光蛋白質 |
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US8647887B2 (en) | 2009-01-29 | 2014-02-11 | Commonwealth Scientific And Industrial Research Organisation | Measuring G protein coupled receptor activation |
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US7897385B2 (en) * | 2004-05-20 | 2011-03-01 | Riken | Fluorescent protein |
US8865124B2 (en) * | 2008-02-29 | 2014-10-21 | Japan Science And Technology Agency | Probe reagent for measuring oxidative stress |
WO2012099279A1 (ja) | 2011-01-21 | 2012-07-26 | 独立行政法人理化学研究所 | 酸化ストレスインジケーター発現用核酸構築物とその使用 |
JP6083731B2 (ja) * | 2012-09-11 | 2017-02-22 | 国立大学法人埼玉大学 | Fret型バイオプローブ及びfret計測方法 |
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Cited By (1)
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US8647887B2 (en) | 2009-01-29 | 2014-02-11 | Commonwealth Scientific And Industrial Research Organisation | Measuring G protein coupled receptor activation |
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US20090176211A1 (en) | 2009-07-09 |
JP4557685B2 (ja) | 2010-10-06 |
US8013119B2 (en) | 2011-09-06 |
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