WO2006057396A1 - プロテアソームの再構成方法 - Google Patents
プロテアソームの再構成方法 Download PDFInfo
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- WO2006057396A1 WO2006057396A1 PCT/JP2005/021842 JP2005021842W WO2006057396A1 WO 2006057396 A1 WO2006057396 A1 WO 2006057396A1 JP 2005021842 W JP2005021842 W JP 2005021842W WO 2006057396 A1 WO2006057396 A1 WO 2006057396A1
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- proteasome
- hsp70
- hsp90
- proteanome
- hsp40
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
- C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
- C12N9/64—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
- C12N9/6421—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
Definitions
- the present invention relates to a novel method for reconstituting a 26S proteasome and a 26S proteasome reconstituted by the method. More specifically, the present invention relates to a method for reconstituting a 26S proteasome using a molecular chaperone such as hsp70, hsp70 / hsp40, hsp90, or PA28, and the 26S proteasome reconstituted by the method. .
- a molecular chaperone such as hsp70, hsp70 / hsp40, hsp90, or PA28
- Ubiquitin-dependent degradation pathway is known as a mechanism for degrading unnecessary proteins in cells.
- Ubiquitin is a small protein with a strength of 76 amino acids, and its yeast strength is widely preserved in the living world, including humans.
- Ubiquitin is a C-terminal glycine residue that binds to the cysteine residue of E1 (ubiquitin-active enzyme) in an ATP-dependent manner, and then the E1 force is also transferred to E2 (ubiquitin-binding enzyme), which is recognized by E3 (ubiquitin ligase). Isopeptide bonds to the lysine side chain of the target protein.
- a polyubiquitin chain is formed.
- the polyubiquitin chain added to the target protein by the ubiquitin system as described above is recognized by the 26S proteasome, and the ubiquitin-cleaved protein is degraded by the 26S proteasome.
- the 26S proteasome is the most important degrading enzyme of intracellular proteins.
- This 26S proteasome also has an enzyme catalytic site 20S proteasome that also has ⁇ ⁇ ⁇ ⁇ ring force and 19Scap molecular force that binds to both sides.
- the conventional 26S proteasome purification method was a method in which a 20S proteanome and a 19Scap molecule were separately purified and finally both molecules were mixed.
- a method of purification at once using gel filtration and ion exchange chromatography Alexei F. Kissel ev, et al., The size of peptides generated from protein by mammalian 26 and 20S protea somes. Biol. Chem. 274, 3363-3371, 1999). These methods are well-recognized biochemically, but they can be purified only from a considerable number of cells ( ⁇ 10 ⁇ ) and tissues (rat liver, scorpion spleen, etc.). Is difficult.
- An object of the present invention is to solve the above-described problems of the prior art. That is, an object of the present invention is to provide a method for reconstituting the 26S proteasome from a relatively small amount of cells or tissues. Furthermore, an object of the present invention is to provide a method for reconstituting 26S proteasome from an arbitrary sample (for example, a sputum sample which can be obtained only in a small amount) by a simple operation.
- the present inventors have used any small amount of cell / tissue lysate ( ⁇ 10 6 cells) as a starting material, and a molecular chaperone (hsp70, hsp40 or hsp90). It was surprisingly found that the 26S proteasome can be reconstituted in a short time by incubating these cells' yarn and tissue lysates in the presence of). The present invention has been completed based on this finding.
- the 26S proteasome is reconstituted in vitro, including incubating a cell or tissue lysate in the presence of hsp70, hsp70 / hsp40, hsp90 or PA28.
- a method is provided.
- an in vitro reconstituted 26S proteanome obtained by incubating a cell or tissue lysate in the presence of hsp70, hsp70 / hsp40, hsp90 or PA28. Is provided.
- the cell or tissue lysate is a supernatant obtained by centrifuging a homogenized liquid containing a buffer solution in the cell or tissue.
- the incubation is performed in the presence or absence of ATP.
- hsp70, hsp70 / hsp40, hsp90 or PA28 is a recombinant protein.
- hsp70, hsp70 / hsp40, hsp90 or PA28 is a recombinant protein labeled with a tag for purification.
- the method of the present invention further comprises a step of purifying the 26S proteasome using the tag after incubation.
- the present invention provides a method of reconstituting a 26S proteasome in vitro, comprising incubating a lysate of a cell or tissue in the presence of hsp70, hsp70 / hsp40, hsp90 or PA28, as well as reconstituted in vitro obtained by the above method.
- hsp70 hsp70 / hsp40, hsp90 or PA28
- the cells or tissues used in the present invention include tissues and organs of any organism including humans (including any organ such as kidney, liver, stomach, small intestine, large intestine, heart, brain, lung, thymus, etc.) Any microorganism, or any cell (including cultured cells) can be used as a starting material. More specifically, in the method of the present invention, the 26S proteasome can be reconstituted from the cytoplasmic fraction of the material.
- the cytoplasmic fraction can be prepared by a normal cytoplasmic fractionation method. For example, by homogenizing and centrifuging the cells described above, the cell membrane, nucleus, mitochondrion, lysosome and micronome fractions can be removed and the supernatant can be used as the cytoplasmic fraction.
- the cell or tissue lysate obtained as described above is incubated in the presence of hsp70, hsp70 / hsp40, hsp90 or PA28.
- This incubation may be performed in the presence of ATP or in the absence of ATP, but in order to obtain a more active 26S proteasome, it is preferably performed in the presence of ATP. .
- hsp70, hsp70 / hsp40, hsp90 or PA28 used in the present invention is known, and is described in, for example, the following documents.
- Hsp70 Soulier 3 ⁇ 4, et al., Developmental regulation of murine integrin ⁇ 1 subunit- and Hsc73— encoding genes in the mammary gland: sequence of a new mouse Hsc73 cDN A. Gene 172 (2), 285-289 (1996), registration number NCBI Accession U27129
- Hsp40 Homo sapiens DnaJ: Strausberg RL et al., Generation and initial analysis of mo re than 15,000 full-length human and mouse cDNA sequences.Proc.Natl.Acad.Sci.U SA 99 (26), 16899-16903 (2002) Registration number NCBI Accession BC002352
- Hsp90 Yamazaki M et al. Nucleotide sequence of a-length cDNA for 90 kDa he at-shock protein from human peripheral blood lymphocytes.Nucleic Acids Res. 17 (1 7), 7108 (1989), accession number NCBI Accession X15183
- the hsp70, hsp70 / hsp40, hsp90 or PA28 used in the present invention may be any of a naturally-derived protein, a recombinant protein, or a chemically synthesized protein, but from the viewpoint of convenience of preparation. Recombinant proteins are preferred. Further, from the viewpoint of facilitating isolation and purification of the 26S proteanome reconstituted by the method of the present invention, hsp70, hsp70 / hsp40, hsp90 or PA28 used in the present invention is labeled with a tag for purification. It is preferable.
- Examples of the tag for purification include a histidine tag [for example, 6 X His tag] or a Flag tag.
- a protein labeled with a histidine tag can be purified with a Ni column, and a protein labeled with a Flag tag can be purified with an anti-Flag antibody.
- hsp70, hsp70 / hsp40, hsp90 or PA28 used in the reconstitution of the 26S proteome will be contained in the reconstituted 26S proteasome, so hsp70, hsp70 / hsp40 , hsp 90 or PA28 may be labeled with a purification tag to facilitate purification of the reconstituted 26S proteasome.
- One of the advantages of the present invention is the ease of purification of the reconstituted 26S proteanome.
- the amount of hsp70, hsp70 / hsp40, hsp90 or PA28 used is not particularly limited as long as the 26S proteanome can be reconstituted.
- the amount of hsp70, hsp70 / hsp40, hsp90 or PA28 used is not particularly limited as long as the 26S proteanome can be reconstituted.
- 10 7 cell pellets are used as the starting material, It is sufficient to use about 5 ⁇ g.
- Incubation for reconstitution of 26S proteanome is carried out at a suitable temperature (eg, 4 ° C to room temperature, preferably 4 ° C) for several minutes to 10 hours, preferably about 1 hour to 5 hours. Good. During the incubation, the mixture is preferably shaken.
- a suitable temperature eg, 4 ° C to room temperature, preferably 4 ° C
- the mixture is preferably shaken.
- the enzyme activity of the 26S proteanome reconstituted by the method of the present invention is determined by an appropriate fluorescent substrate (for example, Sue-LLVY-AMC (N-succil-Leu-Leu-Vaktyr-7-amino-4). -Methyl-coumarin) etc.). Since this Suc-LLVY-AMC emits fluorescence when cleaved by the proteasome, the enzyme activity of the oral theanome can be evaluated by measuring the intensity of the fluorescence.
- an appropriate fluorescent substrate for example, Sue-LLVY-AMC (N-succil-Leu-Leu-Vaktyr-7-amino-4). -Methyl-coumarin) etc.
- the 26S proteasome reconstituted by the method of the present invention is composed of the 20S proteasome as a protease and other regulatory factors, and can recognize and degrade ubiquitinated proteins.
- the 26S proteasome reconstituted by the method of the present invention can be used to elucidate the function of the enzyme and to elucidate the degradation mechanism of ubiquitin-like proteins. It can also be used for diagnosis and treatment of various diseases. Certain oncogenes have been reported to be degraded by ubiquitin-dependent degradation pathways Yes. Therefore, the 26S proteasome reconstituted by the method of the present invention is useful for elucidation of the mechanism of canceration, treatment and diagnosis of cancer, and the like.
- the 26S proteasome reconstituted by the method of the present invention is useful for elucidating the mechanism of Alzheimer's disease and treating and diagnosing Alzheimer's disease.
- proteasome inhibitor may be a therapeutic agent for such diseases.
- the 26S proteasome reconstituted by the method of the present invention can also be used in a screening system for proteasome inhibitors.
- Example I Reconstitution of 26S proteanom with hsp70, hsp70 / hsp40, hsp90, PA28 Purification from mouse normal liver tissue 101 was carried out using hsp70, hsp70 / hsp40, hsp90, PA28, and ATP
- the 26S proteasome was reconstituted in vitro with buffer conditions in the presence or absence. A total of eight types of proteasomes were reconstituted from the combinations.
- 26S buffer A 25 mM Tris-HCl (pH 7.5), 2 mM ATP, ImM DTT, 0.25) corresponding to 4 to 10 times the volume of cell pellet or liver tissue, etc. M sucrose, 1% NP40, 0.5 mM PMSF) and homogenize well with a homogenizer.
- the proteasome is eluted with 100 ⁇ l of 26S buffer D (25 mM Tris—HCl (pH 7.5), 2 mM ATP, ImM DTT. 0.25 M sucrose, 0.2 M Imidazole).
- the reconstituted 26S proteasome sample is a proteasome reconstituted from about 1 ⁇ g of yarn and weave weight.
- Fig. 1 shows the results of enzyme activity of eight kinds of crude 26S obtained.
- the 26S proteanome which is active to some extent is recovered by hsp70 / hsp40, hsp90, and PA28 even in the absence of ATP.
- the activity of reconstitution with hsp70 alone was low. That is, the presence of hsp40 reduces ATP requirements.
- the most active 26S proteanome is reconstituted in the presence of 0.2 mM ATP.
- Example 2 Cleavage of precursor peptide of MHC class I antigen peptide by 26S proteasome MHC class I antigen peptide precursor peptide (added with C-terminal flanking) by 26S proteasome reconstituted in Example 1 ), And an experiment was conducted to see if the MHC class I antigen peptide was actually excised.
- the model peptide used was OVA (SI
- the proteanome obtained as shown in FIG. 1 was cleaved for 0,1,3,12 hours (final volume 100 1), and the low molecular weight one was recovered with Centricon 10.
- the composition of the reaction solution is as in Example 1. The measurement was performed in the same manner as in the case of measuring the hydrolytic activity of Suc-LLVY-amc in the presence of ATP.
- cytotoxic T cells The cytotoxic activity of target cells by different cytotoxic T cells (CTL) was observed in the chromium 51 release test. If the injury activity is high, this means that many MHC class voyage peptides have been cut out. The result is shown in Fig.2.
- OVA is an MHC class I ligand in both hsp90-based and PA28-based proteasomes
- Example 3 Fractionation of 26S proteanome reconstituted in vitro
- the 26S proteasome reconstituted in vitro was further fractionated according to molecular weight using a gel filtration column (Amersham Superose 6).
- the reconstituted proteasome was concentrated to 1001 and injected into the AKTAFPLC system.
- the solution was flowed at a flow rate of 0.5 ml / min and fractionated at 1 ml / fraction.
- 26S buffer C was used as the mobile phase.
- the Suc-LLV Y-amc degradation activity of each fraction was measured according to the method shown in Example 1.
- Each fraction NO. Is plotted on the horizontal axis and the enzyme activity is plotted on the vertical axis.
- Example 4 Inhibitory effect of gelsanamycin on Suc-LLVY-AMC degradation activity of 26S proteanome
- PA28a promotes the appearance of a football-type proteanome and the formation of a hybrid-type proteanome.
- hsp90 promotes the formation of single-cap 26S proteasome, but it disappears in the presence of geldanamycin 5 ⁇ or EDTA O.lmM.
- Example 6 Promoting assembly of single-cap type 26S proteanome by hsp90
- Example 7 Reconstruction of proteanome with PA28a and hsp90
- ⁇ 28 ⁇ was added to mouse EL4 cells or ⁇ 28 ⁇ — 'j8 — / _ cell lysate in the absence or presence of ATP and hsp90 in the presence of TP, and pulled down after 30 minutes incubation. .
- Identification of bound molecules was performed by SDS-PAGE followed by Western blot, and Western blot was performed with antibodies against 20S proteasome and 19Scap Rptl after Native-PAGE to identify the type of proteanome formed. .
- PA28a settles the football-type proteasome, and in the presence of ATP, the force that has precipitated the hybrid proteasome. It is noteworthy that endogenous hsp90 enters this. ( Figure 8).
- hsp90 precipitates the hybrid proteasome in the presence of ATP, but of course, endogenous PA28 is also precipitated together (Fig. 8).
- single-cap 26S proteanome is precipitated from lysates of ⁇ 28 ⁇ -j8- cells by hsp90 (Fig. 8). Therefore, PA28 has nothing to do with the binding of hsp90 to the single cap type 26S proteanome! /.
- PA28a reconstitutes the football proteasome in the absence of ATP and the hybrid proteasome in the presence of ATP.
- hsp90 reconstitutes the hybrid proteasome in the presence of ATP.
- PA 28a-10 ⁇ -cell lysate reconstitutes single-cap 26S proteasome.
- Fig. 8 shows how the proteasome complex precipitated in suc-LLVY-amc (chymotrypsin-like activity) and Boc-LRR-amc (trypsin-like activity) is affected in the presence of geldanamycin.
- a proteasome complex as shown in Fig. 9 was purified from EL4 or ⁇ 28 ⁇ - ⁇ j8 cell extract using recombinant PA28 ⁇ , hsp90.
- Each proteasome complex was treated with gelmanamycin (GA) 25 mM for 30 minutes to prepare a non-progenitor product.
- the enzyme activity was measured for chymotrypsin-like activity and trypsin-like activity using Suc-LL VY-amc and Boc-LRR-amc, respectively.
- FIG. 10 shows a summary of the proteanome reconstitution process using PA28a and hsp90. Covering any cell lysate with 28 ⁇ or hsp90 allows reconfiguration of football, single cap 26S, and hybrid proteanomes.
- the present invention makes it possible to reconstitute the 26S proteasome in vitro using a molecular chaperone (hsp70, hsp40 or hsp90) as a recombinant protein from a partial lysate of an extremely small amount of cells' tissue.
- a molecular chaperone hsp70, hsp40 or hsp90
- This makes it possible to extract proteasomes from cells / tissues more easily than conventional methods.
- This also makes it possible to arbitrarily extract different types of proteasomes that are characteristically expressed in individual cells' tissues.
- FIG. 1 shows the results of measuring the enzyme activity of a 26S protease that was reconstituted in the presence of hsp70, hsp70 / hsp40, hsp90, or PA28.
- FIG. 2 shows the results of examining the cleavage of the precursor peptide of MHC class I antigen peptide by 26S proteasome.
- PA28 a -assembled proteasome Black bar PA28 ⁇ ⁇ C5-assembled proteasome (dominant negative of PA28 a) Gray bar; hsp90- assemled proteasome Oblique bar; Pulse with synthetic peptide (with or without) Target cells
- FIG. 3 shows the results of fractionating the 26S proteasome reconstituted in vitro according to molecular weight using a gel filtration column (Amersham Superose 6).
- FIG. 4 shows the results of Western blotting for examining protein molecules in each fraction obtained by fractionating 26S proteasome using a gel filtration column.
- FIG. 5 shows the results of examining the inhibitory effect of 26D proteanome on the Suc-LLVY-AMC degradation activity by geldanamicin.
- FIG. 6 shows the results of investigating the promotion of proteanome assembly by Hsp90 and PA28 ⁇ .
- FIG. 7 shows the results of examining the assembly promotion of a single-cap type 26S proteanome by hsp90.
- FIG. 8 shows the results of examining the proteanome reconstitution with PA28 ⁇ and hsp90.
- Figure 9 shows the effect of hydrolytic activity of proteasome complexes on suc-LLVY-amc (chymotrypsin-like activity) and Boc- LRR-amc (trypsin-like activity) in the presence of geldanamycin. The result of examining whether to receive is shown.
- FIG. 10 shows the process of reconstructing the proteanome by PA28 ⁇ and hsp90.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006547926A JPWO2006057396A1 (ja) | 2004-11-29 | 2005-11-29 | プロテアソームの再構成方法 |
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| JP2004343923 | 2004-11-29 | ||
| JP2004-343923 | 2004-11-29 | ||
| JP2005-263898 | 2005-09-12 | ||
| JP2005263898 | 2005-09-12 |
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| WO2006057396A1 true WO2006057396A1 (ja) | 2006-06-01 |
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| PCT/JP2005/021842 Ceased WO2006057396A1 (ja) | 2004-11-29 | 2005-11-29 | プロテアソームの再構成方法 |
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| WO (1) | WO2006057396A1 (ja) |
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- 2005-11-29 JP JP2006547926A patent/JPWO2006057396A1/ja active Pending
- 2005-11-29 WO PCT/JP2005/021842 patent/WO2006057396A1/ja not_active Ceased
Non-Patent Citations (9)
| Title |
|---|
| CASCIO P. ET AL.: "Properties of the hybrid form of the 26S proteasome containing both 19S and PA28 complexes", EMBO J., vol. 21, no. 11, June 2002 (2002-06-01), pages 2636 - 2645, XP002996564 * |
| KISSELEV A.F. ET AL.: "The sizes of peptides generated from protein by mammalian 26 and 20S proteasomes. Implications for understanding the degradative mechanism and antigen presentation", J. BIOL. CHEM., vol. 274, no. 6, February 1999 (1999-02-01), pages 3363 - 3371, XP002996565 * |
| KOPP F. ET AL.: "Reconstitution of Hybrid Proteasomes from Purified PA700-20S Complexes and PA28 alpha beta Activator: Ultrastructure and Peptidase Activities", J. MOL. BIOL., vol. 313, no. 3, October 2001 (2001-10-01), pages 465 - 471, XP004472443 * |
| SOULIER S. ET AL.: "Developmental regulation of murine integrin beta 1 subunit- and Hsc73-encoding genes in mammary gland: sequence of a new mouse Hsc73 cDNA", GENE, vol. 172, no. 2, June 1996 (1996-06-01), pages 285 - 289, XP004042752 * |
| STRAUSBERG R.L. ET AL.: "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences", PROC. NATL. ACAD. SCI. USA, vol. 99, no. 26, December 2002 (2002-12-01), pages 16899 - 16903, XP002294427 * |
| TANAHASHI N. ET AL.: "Hybrid Proteasomes", J. BIOL. CHEM., vol. 275, no. 19, May 2000 (2000-05-01), pages 14336 - 14345, XP002996562 * |
| VERMA R. ET AL.: "Proteasomal proteomics: identification of nucleotide-sensitive proteasome-interacting proteins by mass spectrometric analysis of affinity-purified proteasomes", MOL. BIOL. CELL., vol. 11, no. 10, October 2000 (2000-10-01), pages 3425 - 3439, XP001014761 * |
| WU B.J. ET AL.: "Transcription of the human hsp70 gene is induced by serum stimulation", PROC. NATL. ACAD. SCI. USA, vol. 82, no. 18, September 1985 (1985-09-01), pages 6070 - 6074, XP002996563 * |
| YAMAZAKI M. ET AL.: "Nucleotide sequence of a full-length cDNA for 90 kDa heat-shock protein from human peripheral blood lymphocytes", NUCLEIC ACID RES., vol. 17, no. 17, September 1989 (1989-09-01), pages 7108, XP002996566 * |
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