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Detection method of proteins in amyloid state, and set for detection of proteins in amyloid state

Detection method of proteins in amyloid state, and set for detection of proteins in amyloid state
IPC classes for russian patent Detection method of proteins in amyloid state, and set for detection of proteins in amyloid state (RU 2509155):
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FIELD: biotechnologies.

SUBSTANCE: invention proposes a detection method of proteins in amyloid state, in which a specimen of lysate of yeast culture or tissue of a mammal is obtained, ionic detergent is added to the specimen, proteins are concentrated in an amyloid shape on a cellulose acetate membrane, and they are detected by means of aptomeres, their conjugates or antibodies specific to amyloid shape of proteins. Besides, a set for detection of proteins in amyloid state is proposed.

EFFECT: invention can be used in medicine for diagnostics of amyloid diseases.

9 cl, 6 dwg, 7 ex

 

The technical field

The present invention relates to molecular biology and medical diagnostics, in particular to a method of diagnosing amyloidosis, based on the detection of amyloids, including infectious variants of prions in biological fluids of animals and humans.

Prior art

Amyloids is insoluble protein aggregates with a fibrillar structure, and resistant to proteases. Amyloid fibrils are linear polymers consisting of ecovalence of connected protein molecules. These polymers are formed by the addition of protein monomers to their ends; however, the growth process is accompanied by enrichment of the joining of monomers of β-layers that are perpendicular to the axis of the polymers associated with conformational rearrangement with the formation of specific "cross-β structure. For amyloid is characterized by the interaction with some dyes, especially with Congo red and thioflavin T (Chiti f, Dobson C.M. 2006. Protein misfolding, functional amyloid, and human disease. Annu. Rev. Biochem. 75, 333-366).

Classification of amyloidosis complex and ambiguous: allocate system amyloidosis (affecting many organs and organ-specific amyloidosis, primary amyloidosis (accumulation of amyloid causes disease) and secondary (accumulation of amyloid due to the network by some other disease). Finally, amyloidosis divided into non-infectious and infectious diseases (prion) (Sipe J.D., Cohen A.S. 2000. History of the amyloid fibril. J. Struct. Biol. 130, 88-98).

Interest in the chemical and physical nature of amyloid caused, primarily, by their relation to a wider group of human and animal diseases. These diseases unite under a common name amyloidosis. Some of these diseases, due to the special form of amyloid, called prions, transmissive. Prion amyloids are described not only in mammals but also in lower eukaryotes, in which they act as achromosome inherited determinants.

Infectious prion protein animal, called PrPScis a special conformationally altered the cellular isoform of the protein PrPCdifferent from it in its spatial structure. The infectious form of the protein PrPScgetting into the body from outside, or it spontaneously appearing, is able to stimulate the transformation of normal form of PrPCin pathogenic abnormal form of PrPScthrough protein-protein interactions. This ensures autocatalytic maintenance of prion protein isoforms (Prusmer, S.B., Scott, M.R., DeArmond,S.J., Cohen,F.E. (1998) Prion protein biology. Cell, 93, 337-348). Among the most famous animal diseases of this type include the so-called "mad cow disease".

To : the most well-known human diseases, associated with the formation of amyloids, are amyloidosis Central nervous system (diseases of Creutzfeldt-Jakob, Alzheimer's disease, Parkinson's disease, Huntington's disease), and diabetes type 2 diabetes and some forms spinocerebellar ataxia, and cataract (Galkin A.P., Mironov, L.N., Zhuravleva GA, Inge-Vechtomov SG Genetics (2006) 42, No. 11, 1558-1570).

Currently available methods for diagnosis of prion diseases is based on the study of the infectivity of tissue samples from diseased individuals or immunodetection pathogenic form of the protein PrP. The first method is potentially very sensitive, but its disadvantage is the long time between inoculation of infectious material in the experimental animal and the development of his disease. The possibility of detection of pathogenic form of the protein can be limited by its low content in the tissues and fluids (blood, urine, lymph, saliva).

Received monoclinal antibodies that distinguish between pathogenic and normal form of the protein PrP (Korth, S., Stierii, C., Streit, P., Moser, M., Schaller, O., Fisher, R., Schultz-Schaeffer, W., Kretzschmar, H., Raeber, A., Braun, U., Ehrensperger, F., Homemann, S., Glockshuber, R., Riek, R., Billeter, M., Wuthrich, K. and Oesch, B. (1997) Prion PrPSc-specific an epitope defined by a monoclonal antibody. Nature, 390, 74-77; O Nuallain, B., Wetzel, R. (2002) Conformational Abs recognizing a generic amyloid fibril an epitope. Proc. Natl. Acad. Sci. USA, 99, 1485-1490). However, diagnostic methods practiced today is based on the research and topsony tissue samples of the brain.

In recent time there have been attempts to develop new methods for diagnosis of prion diseases, based on different principles. One such approach is based on the ability of the prion protein to pass into the pathogenic form in vitro. In these experiments are mixed in vitro protein in the prion state, with its narional option and see the transformation of normal prion protein in the form. As we have noted above, this transformation is effective for protein Sup35 yeast, but not for protein PrP mammals. Developed a method of increasing the rate of conversion of PrP protein into the prion form. This method is based on periodic ultrasonic crushing prion aggregates (Saborio, G.P., Permanne, B. and Soto, C. (2001) Sensitive detection of pathological prion protein by cyclic amplification of protein misfolding. Nature, 411, 810-813).

A promising alternative to existing approaches for the diagnosis of prion diseases, as well as to create new drugs with potential therapeutic action is the procedure of designing and selective selection of short oligonucleotides (aptamers) DNA-type or RNA-type origin of a vast array of original mixture of chemically synthesized fragments with random sequence ("SELEX" - Systematic Evolution of Ligands by Exponential enrichment), Klug S.J., Famulok, M. (1994) All you wanted to know about SELEX. Molecular Biology Reports, 20, 97-107).

So in the patent application PCT W02006138676 described group polynucleotides (aptamers)with the ability to bind with protein PrP, and PrP protein detection using these aptamers.

However, so far there is no method of determining the concentration of pathogenic prion protein in biological fluids and tissues (except brain) sick animals due to its very small quantities. One of the main problems of creating a method of identifying the pathogenic prion protein is the concentration of the prion protein to detectable amounts.

Description of the invention

The aim of the present invention is to provide a fast, efficient and reliable method of detecting proteins in the amyloid state.

As the result of careful study, the authors present invention has been developed a method of detecting proteins in the amyloid state, in which receive the sample lysate of yeast culture, tissue, or biological fluid of a mammal, concentrate the proteins in the amyloid form on cellulose acetate membrane and detects them using aptamers or antibodies. The pore size of the membrane is selected such that the delay of prion polymers, but ignore all other substances with lower molecular weight.

Advantages and benefits of the present invention are the two who are simplicity, accessibility, efficiency, possibility of rapid and simultaneous analysis of a large number of samples and the high sensitivity of the method due to the unlimited possibilities of the concentration of proteins in the amyloid state by passing an unlimited number of test sample through the membrane.

Thus, the present invention provides a method for non-invasive diagnosis of proteins in the amyloid state in biological fluids of a mammal, in particular humans, which currently is not.

For detection of proteins in the amyloid state can be used aptamers and antibodies specific to proteins in the amyloid state.

For example, earlier authors present invention through careful screening of selected aptamers with the ability to effectively and specifically bind to a protein Sup35 yeast S. cerevisiae in fibrillar amyloid condition and not to communicate with its Monomeric form, the possibility of using these aptamers for the detection of prion forms of proteins mammals, in particular PrP protein in infectious animal material, as well as polyglutamine proteins, for example Q70, which is the analog of the protein of huntingtin, and developed a way of detecting these prion forms of proteins using specified the aptamer (Russian patent application 2010125875).

Thus, the aim of the present invention is the provision of a method of detecting proteins in the amyloid state, in which receive the sample lysate of yeast culture or tissue of a mammal or a sample of biological fluid of a mammal, add to the sample ionic detergent, concentrate the proteins in the amyloid form on cellulose acetate membrane and detects them using aptamers or antibodies.

Also the aim of the present invention is the provision of the above-described method, in which the biological fluid is blood, lymph, saliva or urine of a mammal.

Also the aim of the present invention is the provision of the above-described method in which the specified detergent is sodium lauroylsarcosine (sarkosyl).

Also the aim of the present invention is the provision of the above-described method in which the concentration of proteins in the amyloid form on cellulose acetate membrane is performed by passing a sample of the lysate through a cellulose acetate membrane.

Also the aim of the present invention is the provision of the above-described method, in which use cellulose acetate membrane with a pore size of 0.1-0.4 microns.

Also the aim of the present invention is the provision of the above-described method in which the detection of proteins in AMI is odnom condition, adsorbed on cellulose acetate membrane, is performed with the use of aptamers, their conjugates or antibodies specific to proteins in the amyloid state.

Also the aim of the present invention is the provision of the above-described method, wherein said conjugate contains a label, recognizable by an antibody.

Another objective of the present invention is the provision of a kit for detection of proteins in the amyloid state, containing cellulose acetate membrane; ionic detergent; aptamers, its conjugate and/or antibody specific to the amyloid form of the protein; and instructions for use of the kit in accordance with the above-described method.

Also the aim of the present invention is the provision described above, in which the cellulose acetate membrane has a pore size of 0.1-0.4 microns.

Another objective of the present invention is the provision of the above set in which the specified detergent is sodium lauroylsarcosine (sarkosyl).

More in detail, the present invention is described below.

Detailed description of the present invention

The concentration of proteins in the amyloid state in the method according to the present invention is carried out by transmission of the test sample through the membrane. The pore size of the membrane is selected such that the delay of the prion is aimery, but ignore all other substances with lower molecular weight. The authors of the present invention has been shown that it is preferable to use cellulose acetate membrane with a pore size of 0.1-0.4 μm, most preferably 0.2 μm.

A sample of tissue culture mammal can be as raw cell lysate and the lysate, the pre-processed in order to clean it from proteins that do not form amyloids, to reduce nonspecific background binding of the aptamer with such proteins from the sample. However, the method according to the present invention is quite effective and has a high sensitivity due to the possibility of unlimited concentration in the absence of the necessary purification of protein, not forming amyloids, so that pre-treatment of the lysate before passing through the membrane is not required.

The investigated samples can also be solutions of substances isolated from biological fluids or tissues of an animal or person, including those intended for the production of pharmaceuticals, biological additives or cosmetics.

The investigated samples can also be a biological fluid of a mammal, in particular humans. Biological fluids that can be used in the method is according to the present invention, include blood, lymph, saliva, urine, but are not limited to.

The possibility of transmission of an unlimited number of test samples through the membrane provides unlimited possibilities concentration of proteins in the amyloid state on the diaphragm that delivers high sensitivity of the method of detection according to the present invention and provides analysis of biological fluids with very small amounts of PrPSc. Thus, the present invention provides a method for non-invasive diagnosis of proteins in the amyloid state in biological fluids of a mammal, in particular humans, which currently is not.

Testing the presence in the samples of the proteins in the amyloid state, adsorbed on the membrane, carried out with the use of aptamers or antibodies specific to proteins in the amyloid state.

The term "aptamer"as used in the present invention, means a single-stranded oligonucleotide capable of binding with another molecule (molecule-target) and education with her relatively stable complex. When this binding occurs not at the expense of standard binding between base pairs according to the Watson-Crick due to hydrogen bonds, and at the expense of other types of non-covalent bonds. These types with the ides include non-covalent hydrogen bonds, electrostatic interaction, linking by van der Wals, hydrophobic interactions, or combinations thereof. This aptamer binds to the target molecule with a much higher affinato than with other molecules present in the sample.

Methods design and characterization of the binding of the aptamer to the target molecule are well known in the prior art (see, for example, Lorsch and Szostak (1996) or U.S. patent No. 5,582,981, 5,595,877, 5,637,459). Themselves aptamers can be obtained by any known method, including chemical synthesis, methods of recombinant DNA, using standard cleaning methods. Also, the term "aptamer" refers to the secondary aptamers containing the so-called "consensus" sequence, obtained by analyzing two or more aptamers that bind the same target molecule. Typically, the length of the aptamer can vary from 10 to 40 or more nucleotides that are required for binding to the target molecule.

Aptamers contain a nucleotide sequence that determines the binding specificity to the target molecule, but may also contain sites flanking this sequence, which is required for amplification of the entire aptamer PCR, or contain sites of restriction endonucleases for Legerova the Oia) in the plasmid cloning, etc. Such flanking sequences usually contain from 10 to 30 nucleotides, with some of these nucleotides may have a random structure.

The aptamers according to the present invention can contain a variety of covalently linked, functional modifications and additional ligands required for detecting binding of the aptamer to the target molecule, for example fluorescent dyes, Biotin or various enzymes, the activity of which is easy to detect (peroxidase, luciferase, alkaline phosphatase, and the like). Such modified aptamers can be obtained by standard methods, well known to experts in the art, for example, during solid-phase synthesis of oligonucleotides or in solution using phosphotriesterase method.

An example of aptamers that specifically bind to the proteins in the amyloid state, are aptamers S1-S4, containing a nucleotide sequence selected from the group consisting of sequences provided in the sequence Listing under the numbers SEQ ID NO:1-4, obtained by the authors of the present invention previously using procedures SELEX (Systematic Evolution ofLigands by Exponential enrichment) and is described in Russian patent application 2010125875. Aptamers S4 (SEQ ID NO:4) is preferred. These oligo is ucleotide have the ability to bind with proteins, forming amyloids, with high specificity and efficiency. Also, these oligonucleotides can be used to detect proteins form amyloids, in particular, the prion protein.

For detection of binding oligonucleotides (aptamers) according to the present invention with proteins, forming amyloids can be used any methods known to experts in this field of technology. Can be applied to methods using radioactive isotopes, when binding with the target molecule used radioactively labeled oligonucleotides, such as32P-labeled oligonucleotides, and the degree of binding was determined after washing the sample for residual radioactivity. Can be used in quantitative PCR, such as real-time PCR, when determining the number of oligonucleotides, contacting the target molecule and the remaining part of the complex of the aptamer - target molecule, after denaturation of such a complex.

Can also be used functional modification of oligonucleotides (aptamers) or more ligands required for detecting binding of the aptamer to the target molecule, for example fluorescent dyes, such as carboxyfluorescein (FAM), Biotin or various enzymes, the activity of which is easy to detect the AMB (peroxidase, luciferase, alkaline phosphatase, and the like). In case of using a biotinylated derivative of the oligonucleotide using a peroxidase, luciferase, and alkaline phosphatase fused with streptavidin or Avidya, with streptavidin and avidin binds to Biotin and peroxidase, alkaline phosphatase and luciferase are used to detect the binding.

Can also be used in the conjugates of the aptamer is labeled, for example, FAM, and as a molecule that allows detection of binding of the specified aptamer with amyloid, using antibodies to the tag.

One embodiment of the present invention provides a kit for detection of proteins in the amyloid state, containing cellulose acetate membrane; ionic detergent; aptamers, its conjugate and/or antibody specific to the amyloid form of the protein; and instructions for use of the kit in accordance with the method according to the present invention. Cellulose acetate membrane in the specified collection has a pore size of 0.1-0.4 μm, preferably 0.2 μm. The most preferred ionic detergent is sodium lauroylsarcosine (sarkosyl).

Brief description of drawings

Figure 1 shows a map of plasmid pL-prnP.

Figure 2 shows a map of plasmid pL-moPnP.

Figure 3 shows the results of the comparative analysis of the adsorption of protein lysates is of Rogga by passing the solution through a cellulose acetate or nitrocellulose membrane. Proteins were stained with nonspecific dye Ponco.

Figure 4 shows the effect of detergents SDS and sarkosyl on the efficiency of adsorption of amyloid PrP on cellulose acetate membrane. The first point of the original lysate diluted 10 times in each of the next serial dilutions 4 more times.

Figure 5 shows the results of the analysis of the binding specificity of the aptamer S4 with amyloid prion protein (PrP), educated his shortened (90-231) or full size (23-231) forms. The first point of the original lysate diluted 10 times in each of the next serial dilutions 4 more times.

Figure 6 shows the effect of the presence of DNA and RNA to the binding specificity of aptamers with amyloid prion protein. "+" samples treated with enzymes Dnazol and RNase; "-" - samples not treated with these enzymes. The first point of the original lysate diluted 10 times in each of the next serial dilutions 4 more times.

Examples

The present invention will be described in more detail below with reference to the following not limiting the present invention to the Examples.

Example 1. Construction of expression plasmids to obtain a full-sized protein of mouse PrP (23-231) and its shortened variant PrP (90-231).

Mnogokupolnaya plasmid pL-PrnP containing the full sequence of the gene PrnP(23-231) mouse coding linakis is the notes from 23 to 231, under control of the CUP1 promoter was created on the basis of the vector pRS425 (Christianson T.W., Sikorski RS, Dante M., Shero J.H., Hieter P. Multifunctional yeast high-copy-number shuttle vectors // Gene. 1992. 110, 119-122). A plasmid was obtained in two stages: the sequence of the CUP1 promoter from plasmid pRS316CG [Liu J.J., Lindquist S. Oligopeptide-repeat expansions modulate "protein-only inheritance in yeast // Nature. 1999. Vol.400. P.573-576] was embedded in the vector pRS425 sites XhoI-BamHI. Then, in the resulting structure on the sites BamHI and SacI was embedded sequence of a gene PrnP (23-231) mouse. The sequence encoding the protein fragment PrP mouse 23 to 231 amino acid amplified by PCR using as template the plasmid pcDNA3-l-3F4 (Narwa R & Harris DA. Prion proteins carrying pathogenic mutations are resistant to phospholipase cleavage of their glycolipid anchors // Biochemistry. 1999. 38(27) P: 8770-7), containing the gene LPR mouse, modified for detection of monoclonal antibodies 3F4 and primers PrnP (23-231) BamHI-F (SEQ ID NO:5) and PrnP SacI-R (SEQ ID NO:6). Used thermostable polymerase Pfu "Silex M" (Russia).

Was used the following program for the amplification of fragments of the murine PrnP gene: 94°C for 2 min; 2 cycles of 94°C for 40 seconds, 49°C for 40 seconds; 72°C for 40 seconds; 24 cycle of 94°C for 40 seconds, 60°C for 40 seconds; 72°C for 40 seconds; and at the end of 72°C for 5 minutes.

The correct sequence of nucleotides in the resulting plasmids were checked by sequencing with what ispolzovaniem standard primers 21M13F (SEQ ID NO: 7) and 29M13R (SEQ ID NO:8). Map of the resulting plasmid pL-PrnP shown in figure 1.

Mnogokupolnaya plasmid pL-moPrP (90-231), containing the sequence of the PrnP gene (90-231) mouse, encoding amino acids 90 to 231, under control of the GPD promoter was created on the basis of the vector pRS425 (Christianson T.W., Sikorski RS, Dante M., Shero J.H., Hieter P. Multifunctional yeast high-copy-number shuttle vectors // Gene. 1992. 110, 119-122). The plasmid was constructed by replacing the BamHI fragment-Sad containing PrP(90-231)-GFP (1,2 TPN), from the plasmid PGPD-PrP-GFP(LEU2) [rubel A.A., Saifutdinova A.F., Lada A.G., A. Nizhnikov, Inge-Vechtomov SG, Galkin A.P. Yeast chaperone Hsp104 regulates gene expression at the post transcriptional level // Mol. Biol. 2008. V.42. No. 1. P.123-130], a fragment of the SacII-SacI containing the sequence of PrP (90-231). The sequence encoding the protein fragment PrP mouse 90 to 231 amino acid amplified by PCR using as template the plasmid pcDNA3-1-3F4 (rubel A.A., Saifutdinova A.F., Lada A.G., A. Nizhnikov, Inge-Vechtomov SG, Galkin A.P. Yeast chaperone Hsp104 regulates gene expression at the post transcriptional level // Mol. Biol. - 2008. - V.42. No. 1. - P.123-130) and primers PmP (90-231)BamHI-F (SEQ ID NO:9) and PmP SacI-R (SEQ ID NO:6). Used the program for amplification described above. The correct sequence of nucleotides in the resulting plasmids were also determined as described above. Map of the resulting plasmid pL-moPrP shown in figure 2.

Note the R 2. Transformation of Saccharomyces cerevisiae and getting lysates containing protein PrP.

As the model used strain 74-D694ΔRNQ1 [psi-] MATa ade1-14 his3Δ200 leu3-112 trp1-289 ura3-52 rnq1::HIS3 yeast Saccharomyces cerevisiae (Salnikova, A.B., Kryndushkin D.S., Smimov V.N., Kushnirov V.V., Ter-Avanesyan MD Nonsense suppression in yeast cells overproducing Sup35 (eRF3) is caused by its non-heritable amyloids // J Biol Chem. 2005, 280, P.8808-8812).

This strain of yeast expressed plasmid containing the sequence encoding PrP 23-231 or PrP 90-231, or as a negative control plasmid PRS425, on the basis of which were created by these plasmids.

For transformation of yeast used a standard Protocol (Gietz, R.D., Schiesti, R.., Willems, .R., and Woods, R.A. (1995) Yeast 11, 355 to 360 above).

Example 3. Getting lysates containing protein PrP

Yeast were grown in 10 ml of minimal medium with appropriate supplements (adenine, uracil, essential amino acids and, if necessary, the copper sulfate as an inductor) to stationary phase. The cells were collected by centrifugation, resuspendable in 5 ml of distilled water was poured into 1 ml in a test tube "Eppendorf" and precipitated by centrifugation, resulting in each tube was 50-100 ál of cells. Next, the cells were frozen and kept at -70°C. To obtain the lysate was thawed one tube was added 3-fold volume of glass beads, 100 μl of Tris-saline buffer TBS (30 mm Tris-HCl pH 7,4,150 mm NaCl), soda is containing 10 mm EDTA, 10 mm phenylmethylsulfonyl of fluoride (PMSF), 1 mm dithiothreitol (DTT) and a cocktail of protease inhibitors (Complete®, Roche Applied Science), in the amount recommended by the manufacturer's Protocol. Cell debris was separated by centrifugation at 1500 g for 4 minutes and the clarified lysate containing polymers PrP protein, Packed up the tubes.

Example 4. The concentration of proteins on membranes

Cellulose acetate membrane (0.2 μm, Whatman GmbH OE66) moistened with distilled water and placed in a cell of the vacuum dot-blotter BioRad. Lysates of yeast cells containing protein PrP was diluted to the desired concentration in TBS buffer with an ionic detergent, making serial dilutions of these solutions in the same buffer and added into cell blotter 50 ál of the obtained solutions lysates. Using a vacuum (water) pump the solutions were pumped through the membrane. Then these cells were added in 100 μl of TBS buffer with an ionic detergent (SDS - sodium dodecyl sulphate or sarkosyl - laurylsarcosine sodium), incubated for 10 minutes, after which the buffer was removed and washed cells is 2 times 100 ál of the same buffer, then 2 times with 100 μl TBS buffer without detergent. After that, the membrane was stained with a dye solution Ponco-to estimate the amount of protein deposited on the membrane. For comparison lysates of yeast similarly passed through nitrate rulesnew membrane (0.45 μm, Macherey-Nagel, Germany), adsorbing proteins. Figure 3 shows that the majority of protein lysates of yeast well adsorbed on a nitrocellulose membrane and easily passes through acetylcellulose even at low dilutions of the lysates.

Example 5. Study of the binding of aptamers and antibodies with protein PrP.

The membrane was incubated for one hour in a solution of casein (4 mg/ml) in TBS buffer, pH 7.4 with 0.05% Tween-20. After that, the membrane was immersed in a solution of labeled aptamers or antibodies to the prion protein. Aptamers labeled with a fluorescent label FAM, 8 picograms were diluted in 0.5 ml of 5 mm phosphate buffer (PBS), pH 6.0, containing 0.05% Tween-20 and 200 mm urea. Aptamers were subjected to denaturation by boiling the resulting solution on a water bath for 5 minutes. Then the solution was cooled at room temperature for 5 minutes, kept for another 30 minutes at room temperature and then dissolved in 8 ml of the same phosphate buffer containing 0.4% casein. Antibodies were diluted in TBS buffer pH 7.4 with 0.05% Tween-20 and 4 mg/ml casein. After an hour incubation at room temperature the membrane was rinsed twice with distilled water and treated with the following solution. In the case of antibody - solution secondary antibodies conjugated with horseradish peroxidase in the same buffer. In the case of aptamers second solution served as antibodies to the FAM in the buffer is TBS. Then after an hour incubation with antibodies to FAM and a single washing of the membrane to the membrane was added a solution of secondary antibodies in TBS. After incubation with secondary antibodies conjugated with peroxidase, the membrane was washed 3 times for 15 minutes with TBS buffer with 0.05% solution of Tween-20 and then 2 times for 15 minutes with TBS buffer. The binding of aptamers or antibodies to the prion protein recorded on the device for the detection of chemiluminescence company Vilber Lourmat, using a mixture exhibiting solutions ECL West Dura system (Thermo Scientific).

Example 6. Effect of detergents SDS and sarkosyl on the efficiency of adsorption of amyloid PrP on cellulose acetate membrane.

Figure 4 presents the results of experiments on the concentration of amyloid PrP on cellulose acetate membrane in the presence of detergents SDS or sarkosyl (sodium lauroylsarcosine). From Figure 2 it is seen that the PrP amyloid dissolved in SDS and not adsorbed on cellulose acetate membrane. For concentration of PrP amyloid as a detergent should be used sarkosyl.

Example 7. The proof of the binding specificity of the aptamers with the prion protein.

To prove the specificity of binding of the aptamers with the prion protein, concentrated on cellulose acetate membrane, a similar experiment was performed with a solution of aptamers obtained for urokinase and have the same the size (70 nucleotides), as the aptamer to the prion protein (Skrypina NA, Savochkina LP, Beabealashvilli RSh. In vitro selection of single-stranded DNA aptamers that bind human pro-urokinase. Nucleosides Nucleotides Nucleic Acids 2004; 23:891-3). As can be seen from Figure 5, the aptamer to the urokinase is not associated with the full-size and truncated prion protein. It also shows that the sensitivity of the aptamer to the prion protein may be higher than monoclonal antibodies to the same protein. Despite the fact that used the aptamer shows a nonspecific binding control lysate, its interaction with prion protein not less than 10 times greater than background binding.

To determine whether the membrane of the nonspecific binding of the aptamer with DNA and RNA present in the lysate of yeast, which can partially be delayed on the membrane, an experiment was conducted to remove DNA and RNA from the lysate by processing their Dnazol and RNase (at a concentration of 0.1 mg/ml each) for 30 minutes at room temperature. As can be seen from Fig.6, the presence or absence of DNA and RNA in the lysate did not affect the efficiency of binding of the aptamer with the prion protein.

While this invention is described in detail with reference to the best mode for carrying out the invention, for a specialist in a specified field of technology it is obvious that can be done various changes and produced equiv the Lenten replacement and such modifications and substitutions are within the scope of the present invention.

All cited documents are part of the description of the present invention and are incorporated in the present description in its entirety by reference.

1. Method of detecting proteins in the amyloid state, which includes the following stages:
- get sample lysate of yeast culture, or tissue of a mammal or a biological fluid of a mammal;
- adding to the sample ionic detergent;
the concentration of proteins in the amyloid form on cellulose acetate membrane; and
- detection of proteins in the amyloid state adsorbed on cellulose acetate membrane using aptamers, their conjugates or antibodies specific for amyloid form proteins.

2. The method according to claim 1, wherein the biological fluid is blood, lymph, saliva or urine of a mammal.

3. The method according to claim 1, characterized in that said detergent is sodium lauroylsarcosine (sarkosyl).

4. The method according to claim 1, characterized in that the concentration of proteins in the amyloid form on cellulose acetate membrane is performed by passing the sample through a cellulose acetate membrane.

5. The method according to claim 1, characterized in that use cellulose acetate membrane with a pore size of 0.1-0.4 microns.

6. The method according to claim 1, characterized in that pointed to by the second conjugate contains a label, recognizable by an antibody.

7. Kit for detection of proteins in the amyloid state, containing:
cellulose acetate membrane; ionic detergent; aptamers, its conjugate and/or antibody specific to the amyloid form of the protein; and instructions for use of the kit in accordance with the method according to claim 1.

8. The kit according to claim 7, characterized in that the cellulose acetate membrane has a pore size of 0.1-0.4 microns.

10. The set of claim 8, characterized in that said detergent is sodium lauroylsarcosine (sarkosyl).

 

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