WO2021262043A1 - Метод и реактивы для детекции активности люциферазы - Google Patents
Метод и реактивы для детекции активности люциферазы Download PDFInfo
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- WO2021262043A1 WO2021262043A1 PCT/RU2021/050186 RU2021050186W WO2021262043A1 WO 2021262043 A1 WO2021262043 A1 WO 2021262043A1 RU 2021050186 W RU2021050186 W RU 2021050186W WO 2021262043 A1 WO2021262043 A1 WO 2021262043A1
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- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C409/00—Peroxy compounds
- C07C409/02—Peroxy compounds the —O—O— group being bound between a carbon atom, not further substituted by oxygen atoms, and hydrogen, i.e. hydroperoxides
- C07C409/04—Peroxy compounds the —O—O— group being bound between a carbon atom, not further substituted by oxygen atoms, and hydrogen, i.e. hydroperoxides the carbon atom being acyclic
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
- C07C57/02—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms with only carbon-to-carbon double bonds as unsaturation
- C07C57/03—Monocarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
- C07D309/32—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H15/00—Compounds containing hydrocarbon or substituted hydrocarbon radicals directly attached to hetero atoms of saccharide radicals
- C07H15/02—Acyclic radicals, not substituted by cyclic structures
- C07H15/04—Acyclic radicals, not substituted by cyclic structures attached to an oxygen atom of the saccharide radical
- C07H15/10—Acyclic radicals, not substituted by cyclic structures attached to an oxygen atom of the saccharide radical containing unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- 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
- C12N9/0004—Oxidoreductases (1.)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/66—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving luciferase
Definitions
- the present invention relates to biology, chemistry and biotechnology, in particular to the bioluminescent system of the Chaetopterus variopedatus worm.
- Bioluminescence is the process of light emission by living organisms in the course of a biochemical reaction, in which chemical energy is converted into light energy.
- the ability to bioluminescence is determined by the presence of a specific protein luciferase or photoprotein. Luciferases are enzymes that catalyze the oxidation of low molecular weight compounds - luciferins, converting them into oxyluciferins. Oxidation is accompanied by the release of light and the release of oxyluciferin.
- the ability to bioluminescence is possessed by organisms belonging to the most different systematic groups. The mechanisms of known bioluminescent reactions are very diverse.
- Marine polychaetes of the species Chaetopterus variopedatus are widespread in various parts of the ocean, including the coasts of New Zealand, Australia, Japan, and Brazil. It is a filter worm that lives in shallow water in a U-shaped tube, both ends of which protrude from the seabed. Under physical stress, the worm emits a flash of blue color and secretes glowing blue mucus when exposed to more aggressive action, indicating that the worm's nervous system controls its luminescent activity (Jeremy D. Mirza et al, Photochem. & Photobiol. Photochemistry and Photobiology. 2020, 10.1111 / php.13221).
- bioluminescent systems luciferases, photoproteins, luciferins, etc.
- proteins of the aquorin family are widely used to study the release and binding of Ca 2+ in biological systems, for example, during muscle contraction.
- bioluminescent systems is described in detail, for example, in Cormier, ML et al., Photochem. & Photobiol. 49/4, 509-512 (1989), Smith, DF et al. in "Bioluminescence and Chemiluminescence: Current Status (P. Stanley & L. Krick, eds.), John Wiley and Sons, Chichester, UK 1991, 529-532.
- the objective of the present invention is to establish the components of the bioluminescence system of the worm Chaetopterus variopedatus, in particular, to identify the substrate molecules of the bioluminescent reaction (luciferins), as well as to develop a method for detecting luciferase in a biological sample using luciferins of the worm Chaetopterus variopedatus and a method for detecting bioluminescence bioluminescence by means of the bioluminescence reaction Chaetopterus variopedatus.
- luciferins bioluminescent reaction
- the technical result consists in expanding the arsenal of technical means in the field of application of bioluminescent systems and is achieved by identifying the molecules of the bioluminescent reaction substrates (luciferins) of the Chaetopterus variopedatus worm, the oxidation of which is accompanied by the emission of light.
- bioluminescent reaction substrates luciferins
- These components of the boluminescent system of the Chaetopterus variopedatus worm are promising for use as reagents for a variety of analyzes, including diagnostic systems, quality control systems, drug testing systems, etc.
- the present invention provides a worm luciferin molecule, namely (10E, 122) -9-hydroperoxyoctadecadenoic acid, characterized by the following structural formula:
- the present invention also includes the use of compounds of general formula (I) or general formula (II) as a substrate for the enzyme luciferase (luciferin), the oxidation of this molecule leads to the appearance of light.
- luciferase luciferin
- Gly is a carbohydrate moiety of a monosaccharide
- Polyol is independently selected and is a polyhydric alcohol
- Acyl is independently selected and is a polyunsaturated fatty acid hydroperoxide characterized by the following structural formula: where n is independently selected and represents 0-3; x is independently selected and represents 1-5; m is independently selected and represents 1-6; y is independently selected and represents 0-7. s In particular embodiments of the invention, the polyhydric alcohol is independently selected and is a diol or a triol.
- the carbohydrate moiety is aldopentose, aldohexose, ketopentose, or ketohexose.
- the carbohydrate moiety is ribose, xylose, mannose, galactose, glucose, allose, ribulose, xylulose, fructose, or sorbose.
- the present invention provides a worm luciferin molecule, namely a molecule 1 -rHflpoKCH-3 - (((2R, 3R, 4S, 5R, 6R) -3,4,5-TpnrHflpoKCH-6- (hydroxymethyl) tetrahydro- 2 ⁇ -pyran-2-yl) oxy) propan-2-yl (42.8E, 102) -7-hydroperoxyhexadeca-4,8,10-trienoate, also called 7-hydroperoxide 2-glycerol ⁇ -0-galactopyranoside (42 , 8E, 102) -hexadecatrienoate, characterized by the following structural formula: and / or its regioisomer 2-rHflpoKCH-3 - (((2R, 3R, 4S, 5R, 6R) -3,4,5-TpnrHflpoKCH-6- (hydroxymethyl) tetra
- the present invention also includes the use of compounds of general formula (III) as a substrate for the enzyme luciferase (luciferin), the oxidation of this molecule leads to the appearance of light.
- the present invention also includes a compound of general formula (IV): formula (IV), or a tautomer, stereoisomer or enantiomer, pharmaceutically acceptable salt, solvate or hydrate thereof, where: n is independently selected and represents 2-8; x 'is independently selected and represents 1-7; m is independently selected and represents 1-6.
- the present invention also includes the use of compounds of general formula (IV) as a precursor of luciferin (preluciferin).
- the present invention also includes a kit for detecting luciferase in a biological sample comprising the luciferin of the invention.
- the kit further comprises a buffer, glycerol, and iron (II) salts.
- kit components are contained in acceptable amounts.
- the present invention also includes a bioluminescent composition comprising luciferase and at least one compound of the present invention.
- the luciferase is recombinant.
- the luciferase is a Chaetopterus variopedatus worm luciferase.
- the present invention also provides a method for detecting (detecting) luciferase in a biological sample, comprising luciferase and / or lipoxygenase, and at least one compound of the invention.
- the luciferase is a Chaetopterus variopedatus worm luciferase.
- the luciferase is a recombinant luciferase.
- the biological sample is a tissue and / or a cell.
- the biological sample has a pH in the range of 7 to 8.
- the lipoxygenase is a recombinant lipoxygenase.
- the method for detecting luciferase includes the following steps: a) adding a compound of the invention to a biological sample to obtain a reaction mixture; b) incubating the reaction mixture under conditions suitable for the onset of bioluminescence; c) detection of bioluminescence in the reaction mixture.
- the concentration of the compound of the invention is 0.03-300 ⁇ M.
- the luciferase is a recombinant luciferase.
- the luciferase is a Chaetopterus variopedatus worm luciferase.
- the biological sample is a tissue and / or a cell.
- the biological sample has a pH in the range of 7 to 8.
- the lipoxygenase is a recombinant lipoxygenase.
- a method for detecting bioluminescence includes the following steps: a) expression of a luciferase gene in a biological sample; b) adding a compound of the invention to a biological sample; c) detection of bioluminescence.
- the concentration of the compound of the invention is 0.03-300 ⁇ M.
- the present invention provides reagents and reagent kits for implementing the methods of the present invention.
- the present invention also includes the preparation of compounds of the invention.
- Figure 1 The result of measuring the bioluminescence of Chaetopterus variopedatus luciferin, initiated by the injection of ferrous iron in time. Data are in logarithmic units.
- Figure 4 Structures of luminescent-active compounds isolated from the biomass of the alga Chaetomorpha Nnit, established using NMR spectroscopy and HPLC-MS.
- Figure 5 The dependence of the intensity of bioluminescence on the amount of the drug luciferin.
- Figure 7 Kinetics of bioluminescent reaction of synthetic 9-, 10-, 12- and 13-hydroperoxides of octadecadienic (linoleic) acid ( 1 Og) and 9-, 10-, 12- and 13-hydroperoxides 1-oxopropylf-0-galactopyranoside (92,122 ) -octadecadienoate obtained by oxidation with singlet oxygen generated in the presence of methylene blue.
- 1 ⁇ l luciferase fraction 1 mg / ml +1 ⁇ l 100 ⁇ M FeSCU + 1 ⁇ l 0.06 mM substrate solution in methanol.
- Figure 8 Kinetics of bioluminescence reaction (logarithmic scale) of synthetic 9-, 10-, 12- and 13-hydroperoxides of octadecadienic (linoleic) acid ( 1 Og) and hydroperoxides of 2- and 3-glycerolph-0-galactopyranoside (97,127) -octadecadienoate obtained by oxidation with singlet oxygen generated in the presence of methylene blue.
- 1 ⁇ l luciferase fraction 1 mg / ml +1 ⁇ l 100 ⁇ M FeSCU + 1 ⁇ l 0.3 ⁇ M substrate solution in methanol.
- Figure 9 Kinetics of bioluminescence reaction (logarithmic scale) of synthetic 9-, 10-, 12- and 13-hydroperoxides of octadecadienic (linoleic) acid ( 1 Og) and analogs conjugated with fluorescent dyes obtained by oxidation with singlet oxygen generated in the presence of methylene blue ( MG).
- 1 ⁇ l luciferase fraction 1 mg / ml +1 ⁇ l 100 ⁇ M FeSCU + 1 ⁇ l 0.3 ⁇ M substrate solution in methanol.
- bioluminescence or “luminescence” as used herein means the process of emitting light resulting from a reaction between an enzyme and a substrate that generates light.
- luciferin in this document means a compound that is a substrate for luciferase enzymes.
- luciferase means a protein that has the ability to oxidize luciferin, where the oxidation reaction is accompanied by the release of light (luminescence) and the release of oxidized luciferin.
- a "luciferase reaction mixture” contains the enzyme luciferase and materials that will enable the enzyme luciferase to generate a light signal.
- the materials required and the specific concentrations and / or amounts of materials required to generate the luminescent signal will vary depending on the luciferase enzyme used as well as the type of luciferase assay being performed.
- these materials may include: buffer to maintain the reaction at the correct pH, the Chaetopterus variopedatus luciferase enzyme, luciferin, and iron (II) salts.
- a typical luciferase reaction mixture may contain Chaetopterus variopedatus luciferase, 50 mM sodium phosphate buffer pH 7.4 , 5% glycerol, 100 ⁇ M FeSCU.
- a "luciferase detection mixture” contains materials that will allow the enzyme luciferase to be detected.
- the materials required and the specific concentrations and / or amounts of materials required to generate the luminescent signal will vary depending on the luciferase enzyme used as well as the type of luciferase assay being performed.
- these materials may include: reducing agents, detergents, salts, glycerol, amino acids, luciferase substrate - luciferin. Often other materials may be added to the solution, including: salts, glycerol, amino acids, etc.
- a typical mixture for detecting luciferase may contain a luciferase substrate, luciferin.
- the Chaetopterus variopedatus worm according to the present invention and / or its functional analog 50 mM sodium phosphate buffer pH 7.4, 100 ⁇ M FeSCU.
- isolated means a molecule or cell that is in an environment other than the environment in which the molecule or cell naturally occurs.
- these components can be in substantially purified form.
- a substantially purified form means that the proteins are at least about 20% pure, often at least 30% pure, usually 50% pure, or at least 90% pure.
- any of the conventional protein purification techniques described, for example, in Guide to Protein Purification, (Deuthser ed.) (Academic Press, 1990) can be used.
- a lysate or protein preparation can be prepared from the original source and purified using HPLC, size exclusion chromatography, gel electrophoresis, affinity chromatography, and the like. Protein preparations can be tested for the presence of active luciferase or a luciferase-luciferin complex using the methods of the present invention.
- mutant refers to a protein (particularly luciferase) disclosed in the present invention in which one or more amino acids have been added and / or substituted and / or removed (deleted) and / or inserted (inserted) at the N-terminus and / or C-terminus, and / or within the native amino acid sequences of the proteins of the present invention.
- mutant refers to a nucleic acid molecule that encodes a mutant protein.
- mutant herein refers to any variant that is shorter or longer than a protein or nucleic acid.
- modifications, additions or deletions can also be introduced by a method including recombination, recursive sequence recombination, DNA mutagenesis by phosphothioate modification, mutagenesis based on the inclusion of a template containing uracil, mutagenesis based on a duplex containing gaps, repair mutagenesis with point mismatching mismatches using a repair-deficient host strain, chemical mutagenesis, radiogenic mutagenesis, deletion mutagenesis, mutagenesis using restriction of selection, mutagenesis using restriction of purification, artificial gene synthesis, matched mutagenesis, creation of a chimeric nucleic acid multimer, or a combination thereof.
- the term “functional” means that a nucleotide or amino acid sequence can function for a specified test or task.
- the term “functional” as used to describe luciferases means that a protein has the ability to produce a luminescent oxidation reaction of luciferin.
- alkyl in this document means both unbranched and branched. In addition, “alkyl” can be either substituted or unsubstituted.
- alkyl refers to groups typically having one to ten carbon atoms.
- -Cmo-alkyl means methyl, ethyl, isopropyl, n-propyl.
- aryl as used herein means groups containing an aromatic ring having from six to twenty carbon atoms, and the aryl may be mono, di, tri, or tetracyclic.
- halogen in particular, chlorine, bromine, fluorine
- - C 0, phenyl, phenyl -UNON.
- An example of aryl groups would be: , phenyl.
- the implementation of the methods of the present invention provides the appearance of luminescence of the reaction mixture containing the biological sample, if the specified sample contains luciferase using as a substrate luciferin according to the present invention and / or its functional analogs according to the invention.
- luciferase is contained, for example, in the marine polychaetes Chaetopterus variopedatus capable of bioluminescence.
- Bio samples can be obtained using a variety of technologies known in biology and include tissue samples, cells, extracts, homogenates, protein mixtures of various degrees of purification, etc.
- biological samples can be obtained from marine polychaetes Chaetopterus variopedatus.
- Bio samples may also contain isolated components (luciferase or luciferase and luciferin according to the present invention and / or functional analogs) of bioluminescent systems of Chaetopterus variopedatus polychaetes.
- Biological samples can also express recombinant luciferase or functional mutants thereof.
- the nucleic acid sequences for the expression of these proteins can be obtained from natural sources (for example, from polychaetes Chaetopterus variopedatus) or synthesized. Many methods are now known for cloning genes encoding proteins of known activity. Some of these methods are described in Maniatis, T., et al. (Molecular Cloning - A Laboratory Manual Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y. 1982) and Newman and Campagnoni (Neuromethods, v. 16, 1990, pp. 13-48). For example, an expression library can be prepared in suitable host cells and tested for luciferase activity.
- a protein can be isolated from a protein preparation, its partial amino acid sequence is determined, and the corresponding cDNA is cloned from a cDNA sample from polychaetes Chaetopterus variopedatus.
- the nucleic acid sequences must be inserted into the expression cassette.
- the expression cassette may exist as an extrachromosomal element or may be incorporated into the genome of a cell by introducing said expression cassette into the cell.
- a nucleic acid encoding a protein is operably linked to a regulatory sequence that may include promoters, enhancers, terminators, operators, repressors, and inducers.
- Expression systems include, for example, bacterial systems, yeast cells, insects, fish, amphibians, or mammalian cells. Methods for making expression cassettes or systems for expressing a desired product are known to those skilled in the art. Cell lines that stably express luciferase can be selected by methods known in the art (for example, co-transfection with a selectable marker such as dhfr, gpt, neomycin, hygromycin, which makes it possible to identify and isolate transfected cells that contain a gene included into the genome).
- the above expression systems can be used in prokaryotic or eukaryotic hosts. For protein production, host cells such as E. coii, B. subtilis, S. cerevisiae, insect cells in combination with baculovirus vectors, or cells of a higher organism such as vertebrates, for example, COS 7 cells, HEK 293, CHO , Xenopus oocytes, etc.
- the term "functional" in relation to luciferase means that the specified protein is capable of using the luciferins of the invention, in particular (10E, 122) -9-hydroperoxyoctadecadenoic acid, 1-hydroxy-3- (((2P, 3P, 45.5P, 6P) -3.4, 5-trihydroxy-6- (hydroxymethyl) tetrahydro-2H-pyran-2-yl) oxy) propan-2-yl (42.8E, 102) -7-hydroperoxyhexadeca-4,8,10-trienoate, also called 7- hydroperoxide 2-glycerolf-0-galactopyranoside (42.8E, 102) -hexadecatrienoate, or 2-hydroxy-3 - (((2P, ZR, 45.5P, 6P) -3,4,5-trihydroxy-6- ( hydroxymethyl) tetrahydro-2H-pyran-2-yl) oxy) prop
- nucleotide sequence "encoding" a polypeptide means that the polypeptide is produced from the nucleotide sequence during translation and transcription of mRNA. In this case, both the coding strand, identical to the mRNA and usually used in the sequence listing, and the complementary strand, which is used as a template for transcription, can be indicated. As is obvious to any person skilled in the art, the term also includes any degenerate nucleotide sequences encoding the same amino acid sequence. Nucleotide sequences encoding a polypeptide include sequences containing introns.
- the methods of the present invention rely on the use of luciferins and / or functional analogs of the invention to detect luciferase activity in biological samples.
- (10E, 122) -9-hydroperoxyoctadecadienoic acid is a compound having the following structural formula:
- luciferin 1-rnflpoKcn-3 (((2R, 3R, 4S, 5R, 6R) - 3,4,5-trihydroxy-6- (hydroxymethyl) tetrahydro-2H-pyran-2-yl) oxy) propan-2-yl (42.8E, 107) - 7-hydroperoxyhexadeca-4,8,10-trienoate, also called 7-hydroperoxide 2-glycerolf-D-galactopyranoside (42.8E, 102) -hexadecatrienoate, having the following structural formula:
- the regioisomer of the above compound is 2-hydroxy-3 - (((2P, 3P, 45.5P, 6P) -3,4,5-trihydroxy-6- (hydroxymethyl) tetrahydro-2H-pyran-2- yl) oxy) propyl (42.8E, 102) -7-hydroperoxyhexadeca-4,8,10-trienoate, also called 7-hydroperoxide 3-glycerolf-E-galactopyranoside (42.8E, 102) -hexadecatrienoate, having the following structural formula:
- PUFA polyunsaturated fatty acid peroxide
- PUFA polyunsaturated fatty acid peroxide
- the recommended scheme for the synthesis of the specified compound includes 10 steps and uses heptin-1 as a starting material. Its advantages are: mild reaction conditions at the cross-coupling stages due to catalysis with copper salts and high yields when obtaining the corresponding propargyl bromides in the Appel reaction. Subsequent condensation of (42,72,102) -hexadeca-4,7,10-trienoic acid 8 with glyceryl tetraacetylglycoside, removal of acetyl protective groups, and peroxidation singlet oxygen in the presence of methylene blue lead to the target product - luciferin of the worm Chaetopterus variopedatus.
- R 1 H
- bioluminescence depends on the amount and preservation of luciferase in biological samples. It should also be noted the effect of light radiation, especially the UV part of the spectrum, on luciferin, leading to its degradation and loss of functionality.
- the formation of the signal is influenced by the pH of the reaction mixture.
- the formation of a bioluminescent signal occurs in the pH range from 6.0 to 9.8, usually in the pH range from 6.5 to 9.0, mainly in the range from 7.0 to 8.0.
- Any standard buffer solutions for a given pH range can be used to adjust the pH, including phosphate buffer, HEPES, Tris-HCI.
- the molarity of the buffer solution does not exceed 2, for example, does not exceed 1, more often in the range from 0.05 to 0.4, usually from 0.1 to 0.2.
- reaction mixtures for the needs of the present invention may also contain protease inhibitors, for example, phenylacetic acid or oxalic acid in standard concentrations.
- luciferin according to the present invention and / or its functional analogs according to the invention are added to a biological sample to a final concentration of 0.03-300 ⁇ M, more often 1-5 ⁇ M.
- a reagent mixture is added to the sample, including a buffer solution, components that stabilize and protect the enzymes of the bioluminescent system from degradation by proteases, and a FeSCU solution.
- a buffer solution, components that protect enzymes from degradation by proteases, and then a solution of luciferin according to the present invention and / or its functional analogs and a solution of FeSCU are added to the biological sample.
- the reaction mixture may contain small amounts of used solvents.
- bioluminescent signal occurs in a wide temperature range - from 4 to 40 ° C, optimally at 20-25 ° C.
- the maximum luminescence intensity is observed at the moment of initiation of the reaction. Then there is a decline, the rate of which is determined by the activity of enzymes and the initial concentrations of substrates. Under certain conditions (there are many substrates, enzyme activity is low, the reaction temperature is lowered), the reaction can be observed for 30 minutes or more (figure 1).
- the methods of the present invention include detecting bioluminescence that occurs in a biological sample containing luciferase upon the appearance of luciferin therein.
- Bioluminescence can be detected using methods known to those skilled in the art, in particular by visual screening or with using a luminometer, photometer, fluorimeter, digital camera, using photosensitive film.
- the maximum luminescence intensity can be used, which is achieved 1-5 seconds after the initiation of the bioluminescent reaction, or the rate of increase in luminescence in the interval up to 30 minutes after the initiation of the bioluminescent reaction, for example, within 1, 5, 10, 20, 30, 60 sec after initiation of reaction or longer.
- the measured luminescence is flashes of light rather than sustained luminescence.
- the luminescence intensity depends on the activity of the enzymes of the bioluminescent system present in the sample, the initial concentrations of the substrates and the temperature of the reaction mixture and usually ranges from 10 kv / s to 10 million kv / s, more often 100-100,000 kv / s.
- the reaction lasts at least 5 minutes after initiation, usually 10-15 minutes, sometimes (depending on conditions) 30 or more minutes.
- the light emitted during the oxidation of luciferin according to the present invention and / or its functional analogs is in the range from 440 to 510 nm, more often in the range from 450 to 475 nm, with an emission maximum at 455-461 nm.
- the methods and reagents of the present invention can be used in a wide variety of in vivo and in vitro bioluminescence assays.
- the methods and reagents of the present invention can be used to identify the active components of the bioluminescent system of Chaetopterus variopedatus polychaetes during their purification.
- the methods and reagents of the present invention can be used to detect functional analogues of enzymes of the bioluminescent system of polychaetes Chaetopterus variopedatus in biological samples.
- the methods and reagents of the present invention can be used to detect recombinant luciferase activity in host cells.
- a nucleic acid encoding a luciferase is to be obtained for use.
- the resulting nucleic acid must be inserted into an expression cassette that provides for the temporary or permanent expression of this nucleic acid in host cells, for example, under promoters of interest to the researcher.
- the expression cassette may contain elements that provide targeted delivery of the construct to the cells or cell compartments of interest, or be contained in particles that provide targeted delivery. After transfection of cells with an expression cassette (for example, as part of an expression vector) and after the time required for production in cells the expression product, detection of luciferase activity within cells or in a cell lysate can be performed.
- kits for use in the above-described applications are also provided.
- kits typically comprise a luciferin according to the present invention and / or a functional analogue thereof, preferably with a buffer solution to dissolve said substrate and / or add it to biological samples.
- the luciferin of the present invention and / or its functional analog can be present in dissolved form in an appropriate storage medium, such as an aqueous or buffered solution, usually in an appropriate container.
- the luciferin of the present invention and / or a functional analogue thereof may be present in the kit in lyophilized form.
- the claimed kits may further include instructions for performing the claimed methods. These instructions can be present in the claimed kits in various forms (for example, in print or on electronic media in the form of a text and / or graphic file) in the amount of one or more.
- bioluminescent compositions for use in the above-described uses.
- the compositions typically comprise the luciferin of the present invention and / or a functional analogue thereof, preferably with a buffer solution to dissolve said substrate and / or add it to biological samples.
- the luciferin of the present invention and / or a functional analogue thereof may be present in dissolved form in an appropriate storage medium such as an aqueous or buffered solution.
- the luciferin of the present invention and / or a functional analogue thereof may be present in the composition in lyophilized form.
- compositions may further comprise auxiliary substances, in particular adjuvants, solvents and / or excipients, such that are compatible with the compounds constituting the essence of this invention and that do not destroy the biological activity of these compounds.
- Luciferase samples for luminescence activity measurements and in vitro conversion experiments were prepared according to the following procedure.
- the final precipitate was diluted in 35 ml of 10 mM phosphate buffer with pH 6 and dialyzed for 1 h at 4 ° C.
- the resulting sample was centrifuged at 25000 g x 20 min at 4 ° C, the supernatant was passed through a 30 x 100 mm column with Cellulose DEAE-32 (Serva) equilibrated with 10 mM phosphate buffer with pH 6.
- 500 ⁇ l of 2 M phosphate buffer at pH 9 and applied to a 16 x 200 mm column with Sepharose DEAE FF (GE Sweden) equilibrated with 10 mM phosphate buffer pH 7.5.
- the active fractions were pooled, diluted with water to a final buffer concentration of 25 mM, and loaded at a rate of 2 ml / min onto a 10 x 500 mm column with Sepharose DEAE FF equilibrated with 10 mM phosphate buffer pH 7.5. After washing the column, the samples were eluted with a linear gradient of 300 ml of 0.5 M NaCl in phosphate buffer at a rate of 4 ml / min.
- Luciferin was extracted from frozen C. variopedatus biomass with 20 ml of 70% ethanol for 1 hour at 0 ° C, after which it was centrifuged at 25000 g x 20 min at 4 ° C. The resulting supernatant was diluted with an equal volume of distilled water and applied to a C16M concentrating cartridge (Biohimmak, Moscow). After washing with 50% ethanol, the sample was eluted with 2 ml of 96% ethanol and its volume was brought to 100 ⁇ l in a vacuum concentrator "Eppendorf 5301". The resulting luciferin preparation was further used as a substrate in the reactions being carried out.
- the filtrate was applied to a 20x100 mm column containing the Diasorb-60-S16T sorbent (Biohimmak, Moscow). The column was washed with 50% ethanol-water solution. The desired substance was eluted from the sorbent with 96% ethanol under isocratic conditions. Active samples were combined, a total of 10 ml was obtained. The resulting sample was dried on an evaporator and diluted in 400 ⁇ l of 96% ethanol and purified using reverse phase HPLC. A semi-preparative column (9.4 x 250 mm), ZORBAX Eclipse XDB-C18 (Agilent Technologies), connected to an Agilent 1260 Infinity LC chromatograph was used.
- the resulting active peak fractions were dried on an Eppendorf concentrator 5301 rotary evaporator at room temperature and diluted in 100 ⁇ L of 96% ethanol. Then, gel filtration chromatography of these practically homogeneous substances was carried out on a Superdex Peptide 10/300 GL column in a mixture of 0.1% formic acid and 50% acetonitrile. The fractions containing the activity were combined and dried on a rotary evaporator.
- (10E, 122) -9-hydroperoxyoctadecadienoic acid (table 1) is a linear molecule containing a carboxyl group ( 13 ⁇ 174.89 ppm and a broadened proton singlet at 12 ppm), two double bonds and hydroperoxide group (singlet proton at 11.27 ppm and tertiary carbon at 85.08 ppm).
- Structure peak # 3 ( Figure 4) corresponds to (10E, 122) -9-hydroperoxyoctadeca-10,12-dienoic acid.
- the configuration of the double bonds was determined based on the values of the spin-spin coupling constants (SSCCs), which were 15 Hz for the 10-11 bond and 11 Hz for the 12-13 bond.
- SSCCs spin-spin coupling constants
- the structure ideally corresponds to the mass of the molecular ion 311 .222; the additional major peak 293.212 in the mass spectrum is the product of the reduction of a peroxide with a carbonyl group at position 9.
- PUFA and their derivatives were dissolved in 1 ml of methanol and the resulting solution was placed in an ampoule. A solution of 0.1 mg / ml methylene blue (0.13 mmol) in methanol was added. A lamp (Nova II, 150 W) was placed at a distance of 15-20 cm in front of the ampoule and oxygen was bubbled through the reaction mixture for 4-6 h, until TLC showed complete conversion of the starting PUFA and their derivatives into more polar products. Then the reaction mixture was evaporated, dissolved in 3 ml of dichloromethane and washed with water (2 x 1 ml) and saturated NaCl solution (1 x 1 ml).
- (10E, 12Z) -9-hydropepoxyoktadeka-10,12-dienic acid for the detection of luciferase in biological samples.
- Luciferin ((10E, 122) -9-hydroperoxyoctadeca-10,12-dienoic acid) was obtained as described above in the Extraction, Separation and Purification of Chaetopterus Luciferase Substrates.
- the background luminescence of the luciferase fraction was first measured, then aliquots of a solution of (10E, 12Z) -9-hydroperoxyoctadeca-10,12-dienoic acid were added.
- the bioluminescent reaction was initiated by injecting 1 ⁇ L of a 100 ⁇ M solution of ferrous sulfate (Fe 2+ ) into the measuring cuvette. In all cases, the luminescence of biological samples was detected.
- luciferin preparation ((10E, 127) -9-hydroperoxyoctadeca-10, 12-dienoic acid), preliminarily diluting it in methanol to obtain different concentrations.
- the bioluminescent reaction was initiated by injecting 10 ⁇ L of a 25 ⁇ M ferrous sulfate (Fe 2+ ) solution into the measuring cuvette.
- the resulting dependence is close to linear: when the amount of luciferin is varied, the intensity of bioluminescence changes by more than 100 times ( Figure 5).
- Luciferin ((10E, 12Z) -9-rnflponepoKCHOKTafleKa-10,12-flneHOBan acid) was obtained as described above in the Extraction, Separation and Purification of Chaetopterus Luciferase Substrates. Clarified tissue lysates from Chaetopterus variopedatus were used as biological samples. Tissue lysates were obtained as described above in the section "Obtaining partially purified luciferase".
- Polyunsaturated fatty acid hydroperoxides were obtained as described above in the sections "General procedure for the preparation of PUFA peroxides using LOX lipoxygenases” and "General procedure for the preparation of PUFA peroxides by oxidation with singlet oxygen in the presence of methylene blue".
- Linoleic acid peroxides were used as model substrates.
- LOX 9-hydroperoxide (10E, 122) octadecade of nanoic (linoleic) acid.
- LOX 9- and 13-hydroperoxides of octadecatrienoic (linolenic) acid.
- glycolipid hydroperoxides containing a diol linker for the detection of luciferase in biological samples.
- Glycolipid hydroperoxides were obtained as described above in the section "General procedure for the preparation of PUFA peroxides by oxidation with singlet oxygen in the presence of methylene blue".
- a protein preparation from the biomass of the Chaetopterus variopedatus worm chromatographically purified on a Superdex 200 column. This preparation was obtained as described above in the section "Obtaining partially purified luciferase”.
- glycolipid hydroperoxides containing a triol linker for the detection of luciferase in biological samples.
- Glycolipid hydroperoxides were obtained as described above in the section "General procedure for the preparation of PUFA peroxides by oxidation with singlet oxygen in the presence of methylene blue".
- a protein preparation from the biomass of the Chaetopterus variopedatus worm chromatographically purified on a Superdex 200 column. This preparation was obtained as described above in the section "Obtaining partially purified luciferase”. 1 ⁇ l 0.3 ⁇ M glycolipid hydroperoxide substrate solution in methanol, 1 ⁇ l 100 ⁇ M FeSCU
- Polyunsaturated fatty acid hydroperoxides conjugated with fluorescent dyes were obtained as described above in the section "General procedure for the preparation of polyunsaturated fatty acids peroxides by oxidation with singlet oxygen in the presence of methylene blue".
- a mixture of 9-, 10-, 12-, and 13-hydroperoxides of linoleic acid conjugated with fluorescein (9,10,12,13-hydroperoxides 2- (6- (((9, 127) -octadeca-9 , 12-dienoyl) oxy) -3-oxo-3N-xanthen-9-yl) benzoic acid) and a mixture of 9-, 10-, 12- and 13-hydroperoxides of linoleic acid conjugated with eosin (9,10,12, 13-hydroperoxides 2- (2,4,5,7-tetrabromo-6 - (((9, 127) -9-hydroperoxyoctadeca-9,12-dienoyl) oxy) -3-oxo-3N-xanthen-9-yl ) benzoic acid).
- the bioluminescent reaction was initiated by injecting 1 ⁇ L of a 100 ⁇ M solution of iron sulfate (Fe2 +) into the measuring cuvette. In all cases, the luminescence of biological samples was detected.
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DATABASE REGISTRY 15 December 1985 (1985-12-15), ANONYMOUS : " .beta.-D-Galactopyranoside, 2-[(12-hydroperoxy-1-oxo-9,13,15- octadecatrienyl)oxy]-3-[(1-oxo-9,12,15-octadecatrienyl)oxy]propyl (9CI) (CA INDEX NAME)", XP055896648, retrieved from STN Database accession no. 99389-38-5 * |
DATABASE REGISTRY 15 December 1985 (1985-12-15), ANONYMOUS : " .beta.-D-Galactopyranoside, 3-[(12-hydroperoxy-1-oxo-9,13,15- octadecatrienyl)oxy]-2-[(1-oxo-9,12,15-octadecatrienyl)oxy]propyl (9CI) (CA INDEX NAME)", XP055896647, retrieved from STN Database accession no. 99389-41-0 * |
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DATABASE REGISTRY 21 December 2017 (2017-12-21), ANONYMOUS : " INDEX NAME NOT YET ASSIGNED", XP055896623, retrieved from STN Database accession no. 2162946-61-2 * |
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SHUBINA LARISA, MAKARIEVA TATYANA, DENISENKO VLADIMIR, DMITRENOK PAVEL, DYSHLOVOY SERGEY, VON AMSBERG GUNHILD, GLAZUNOV VALERY, SI: "Absolute Configuration and Body Part Distribution of the Alkaloid 6-epi-Monanchorin from the Marine Polychaete Chaetopterus variopedatu", NATURAL PRODUCT COMMUNICATIONS, vol. 11, no. 9, 1 September 2016 (2016-09-01), pages 1253 - 1257, XP009533946, ISSN: 1934-578X, DOI: 10.1177/1934578X1601100915 * |
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