CN116699125A - Use of conjugates in the preparation of detection reagents - Google Patents
Use of conjugates in the preparation of detection reagents Download PDFInfo
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- CN116699125A CN116699125A CN202310553479.0A CN202310553479A CN116699125A CN 116699125 A CN116699125 A CN 116699125A CN 202310553479 A CN202310553479 A CN 202310553479A CN 116699125 A CN116699125 A CN 116699125A
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- glucose
- cyclosporin
- phosphate dehydrogenase
- cyclosporine
- detection
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- XPFJYKARVSSRHE-UHFFFAOYSA-K trisodium;2-hydroxypropane-1,2,3-tricarboxylate;2-hydroxypropane-1,2,3-tricarboxylic acid Chemical compound [Na+].[Na+].[Na+].OC(=O)CC(O)(C(O)=O)CC(O)=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O XPFJYKARVSSRHE-UHFFFAOYSA-K 0.000 description 1
- 229960000281 trometamol Drugs 0.000 description 1
- 229960000604 valproic acid Drugs 0.000 description 1
- 230000002227 vasoactive effect Effects 0.000 description 1
- 229960003726 vasopressin Drugs 0.000 description 1
- 235000019166 vitamin D Nutrition 0.000 description 1
- 239000011710 vitamin D Substances 0.000 description 1
- 150000003710 vitamin D derivatives Chemical class 0.000 description 1
- 229940046008 vitamin d Drugs 0.000 description 1
- 208000005494 xerophthalmia Diseases 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
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Abstract
The application relates to the use of conjugates in the preparation of detection reagents. Specifically, the mutant glucose 6-phosphate dehydrogenase of the present application comprises one mutation or a combination thereof selected from the group consisting of: d306C, D375C, G426C. The detection kit prepared by using the glucose 6-phosphate dehydrogenase mutant has the advantages of strong specificity, high sensitivity, convenient operation, short detection time, accurate quantification and suitability for high-throughput detection.
Description
The application relates to a ' 6-phosphoglucose dehydrogenase mutant ' with application number 2020100131747, which is filed on 1 month and 7 days in 2020, and a divisional application of a ' application of the ' 6-phosphoglucose dehydrogenase mutant ' in preparation of cyclosporine A detection reagent.
Technical Field
The application relates to the field of biological detection, in particular to mutant enzyme glucose 6-phosphate dehydrogenase (G6 PDH for short) and application thereof in a cyclosporine A detection kit.
Background
Hapten, some small molecule substances (molecular weight less than 4000 Da) alone are not able to induce an immune response, i.e. are not immunogenic, but are immunogenic when crosslinked or conjugated to a carrier such as a macromolecular protein or non-antigenic polylysine, inducing an immune response. These small molecule substances can bind to the response effect products, are antigenic, are only immunoreactive, are not immunogenic, and are also called incomplete antigens.
Hapten can bind to the corresponding antibody to generate antigen-antibody reaction, and antigen which can not independently excite human or animal body to generate antibody can not be generated. It is only immunoreactive, not immunogenic, also known as incomplete antigen. Most polysaccharides, lipids, hormones and small molecule drugs belong to the hapten group. If hapten is chemically bound to a protein molecule (carrier), new immunogenicity is obtained and the animal is stimulated to produce the corresponding antibody.
Small molecule antigens or haptens, which lack two or more sites available for sandwich methods, cannot be assayed by the double antibody sandwich method, and are often in competition mode. The principle is that the antigen in the specimen and a certain amount of enzyme-labeled antigen compete for binding with the solid phase antibody. The more the antigen content in the specimen, the less the enzyme-labeled antigen is bound on the solid phase, and the lighter the color development. ELISA assay for small molecule hormones, drugs and the like is commonly used.
Cyclosporin a (CsA) has the structural formula shown below:
cyclosporin a is a fat-soluble cyclic peptide composed of a plurality of amino acids secreted by fungi (trichoderma polyspora or trichoderma aschersonia). CsA is used as an immunosuppressant with high selectivity and ultralow bone marrow toxicity, can selectively inhibit proliferation and release of T-helper lymphocytes, has antifungal activity, and can effectively reduce infection of patients. Cyclosporin A has important clinical application value in organ and tissue transplantation, hematopathy, ophthalmic diseases and the like, and can prevent rejection reaction caused by organ or tissue transplantation of allogeneic kidney, liver, heart, bone marrow and the like, and can also prevent and treat graft-versus-host reaction caused by bone marrow transplantation; in the aspect of hematopathy, can be applied to diseases such as aplastic anemia, erythrocyte aplastic anemia, myelodysplastic syndrome, autoimmune hemolytic anemia and the like; in the aspect of ophthalmic diseases, the preparation is mainly used for diseases such as Behcet's syndrome, xerophthalmia, scleritis, allergic conjunctivitis and the like.
Cyclosporin a, a common drug used as calcineurin inhibitor, has become one of the important choices for the treatment of many refractory kidney diseases and organ transplantation, mainly distributed in human tissues other than brain, and mainly distributed in erythrocytes and plasma in blood. Cyclosporin a is mainly metabolized by the liver, 15 metabolites are known, the elimination half-life is about 10-27 hours, the metabolites are mainly excreted by bile through feces, and only 0.1% of the urine is excreted in the form of original drug.
However, because the medicine has a narrow safety range and complex metabolic influence factors, obvious individual differences exist in pharmacokinetics and pharmacodynamics, and the correlation between the blood concentration and the dosage is poor, the difficulty is increased for clinical treatment, and the problems of adverse reactions such as nephrotoxicity, hirsutism, gingival hyperplasia and the like, serious individuation differences of the adverse reactions and the like are easily generated.
For the reasons, the blood concentration of cyclosporine A needs to be monitored in time in the treatment process, so that the method is an effective mode for assisting clinical treatment, improving the treatment effect and reducing the toxicity risk.
The currently known cyclosporine a detection methods mainly comprise: high Performance Liquid Chromatography (HPLC), luminescence immunity, enzyme-linked immunosorbent assay (ELISA), etc. The HPLC method requires complex sample pretreatment, and has the advantages of long operation period and high cost; the luminous immunoassay method has the disadvantages of high reagent cost, inapplicability to detection of conventional therapeutic drugs and inapplicability to large-scale popularization.
The existing homogeneous enzyme immunoassay and latex agglutination turbidimetry are often limited in application due to complex preparation process and large batch-to-batch difference.
The prior art CN107782889a describes a cyclosporin a detection kit, wherein a preparation method of a conjugate of glucose-6-phosphate dehydrogenase and cyclosporin a is disclosed:
accurately weighing 240mg of cyclosporine A,50mg of 4-benzoyl benzoic acid, filling the mixture into a quartz cuvette, adding 10mL of tertiary butanol, and carrying out ultrasonic dissolution;
irradiating with ultraviolet light for 3 hr, reacting completely, and standing at room temperature to obtain lyophilized powder;
accurately weighing 4.5mg of glucose-6-phosphate dehydrogenase, dissolving in 0.5mL of 10mM PBS solution (pH 7.4), dissolving 15mg of the powder (CsA-BBa) in 0.7mL of Dimethylformamide (DMF), and dropwise adding the CsA-BBa into the PBS solution dissolved with GDH under stirring at a constant temperature of 25 ℃;
adjusting the pH of the solution to 6.0-8.0, adding 120 μl of 0.5% carbodiimide (EDC) dropwise, and stirring at 4deg.C overnight;
purifying by G-25 gel chromatography column to obtain glucose-6-phosphate dehydrogenase-cyclosporine A conjugate, and storing at 2-8deg.C.
However, the prior art methods rely on activation of the reactive group carried by the small molecule drug (cyclosporine A) itself, followed by reaction with the enzyme. Such coupling methods can occur when multiple cyclosporins a are linked to the same glucose hexaphosphate dehydrogenase, and it is difficult to ensure consistency of the coupling site, and it is difficult to ensure orientation between the small molecule drug and the enzyme 1:1, resulting in large batch-to-batch variation.
Disclosure of Invention
In view of the needs in the art, the application provides a novel glucose-6-phosphate dehydrogenase mutant and application thereof in preparation of a cyclosporine A detection kit.
According to some embodiments, a glucose 6-phosphate dehydrogenase mutant is provided. Unlike the mutants of glucose 6 phosphate dehydrogenase of the prior published patent US006090567A (Homogeneous immunoassays using mutant glucose-6-phosphate dehydrogenases), the glucose 6-phosphate dehydrogenase mutant of the present application comprises a mutation selected from the group consisting of: d306C, D375C, G426C.
According to some embodiments, there is provided a glucose 6-phosphate dehydrogenase mutant, the glucose 6-phosphate dehydrogenase mutant being represented by a sequence selected from the group consisting of: SEQ ID No.2, SEQ ID No.3, SEQ ID No.4.
According to some embodiments, a polynucleotide encoding a glucose 6-phosphate dehydrogenase mutant of the present application is provided.
According to some embodiments, there is provided an expression vector comprising a polynucleotide of the application.
According to some embodiments, there is provided a host cell comprising an expression vector of the application. The host cell may be prokaryotic (e.g., bacteria) or eukaryotic (e.g., yeast).
According to some embodiments, there is provided a conjugate which is a glucose 6-phosphate dehydrogenase mutant of the present application and a hapten in a molar ratio of 1: and (3) coupling x. In some embodiments, x is 1 to 10, e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. In some specific embodiments, the molar ratio of glucose 6-phosphate dehydrogenase mutants of the present application to hapten is preferably 1:1.
in some specific embodiments, the hapten has a molecular weight of 100Da to 4000Da, for example: 100. 150, 200, 250, 300, 350, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 520, 550, 570, 600, 620, 650, 700, 750, 800, 850, 900, 950, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000.
According to the present application, the skilled person will understand that "hapten" also includes the form of its derivative. In order to facilitate the coupling with glucose-6-phosphate dehydrogenase, haptens (e.g., cyclosporin A) that do not themselves have a coupling group (e.g., a group that reacts with a thiol group) may be engineered to have a linker for covalent binding to the thiol group. Thus, in the present application, hapten derivatives refer to haptens engineered to bear a thiol-reactive group.
The hapten is selected from the group consisting of: small molecule drugs (e.g., antibiotics, psychotropic drugs), hormones, metabolites, sugars, lipids, and amino acids.
Hapten such as, but not limited to: vancomycin, theophylline, phenytoin, vitamin D, 25 hydroxy vitamin D, 1, 25 dihydroxyvitamin D, folic acid, cardiac glycoside (including digoxin, digitoxin), zymophenolic acid, lei Paming, cyclosporin A, amiodarone, methotrexate, tacrolimus, serum amino acids, bile acids, glycocholic acid, phenylalanine, ethanol, the product of the uronictin metabolite, cotinine, uromorphine, uromonohydric phenol derivatives, neuropeptide tyrosine, plasma galanin, polyamines, histamine, thyroid stimulating hormone, prolactin, placental lactogen, growth hormone, follicle stimulating hormone, luteinizing hormone, adrenocorticotropin, antidiuretic hormone, calcitonin, procalcitonin, parathyroid hormone, thyroxine, triiodothyronine, anti-triiodothyronine, free thyroxine, free triiodothyronine, cortisol urine 17-hydroxycortic steroids, urine 17-ketosterols, dehydroepiandrosterone and sulfates, aldosterone, uronolamine mandelic acid, plasma renin, angiotensin, erythropoietin, testosterone, dihydrotestosterone, androstenedione, 17 alpha-hydroxyprogesterone, estrone, estriol, estradiol, progesterone, human chorionic gonadotropin, insulin, proinsulin, C peptide, gastrin, plasma prostaglandin, plasma 6-keto prostaglandin f1α, prostacyclin, epinephrine, catecholamine, norepinephrine, cholecystokinin, natriuretic acid adenosine cyclophosphate, cyclic guanosine monophosphate, vasoactive peptides, somatostatin, secretin, P-substance, neurotensin, thromboxane A2, thromboxane B2, 5 hydroxytryptamine, neuropeptide Y, osteocalcin.
In a specific embodiment, the hapten is cyclosporin a or a derivative thereof.
In a specific embodiment, the hapten is a cyclosporin a derivative with a thiol-reactive group, such as, for example, a maleimide, bromoacetyl, vinyl sulfone, or aziridine.
In a specific embodiment, the hapten is a cyclosporin a derivative, as shown in formula I:
wherein CsA isAs shown.
In some embodiments, m is an integer from 1 to 10, preferably an integer from 1 to 3, such as 1, 2, 3.
In a specific embodiment, the cyclosporine a derivative is represented by formula III:
wherein CsA isShown; .
According to some embodiments, there is provided an agent comprising a conjugate of the application.
According to some embodiments, there is provided the use of a glucose 6-phosphate dehydrogenase mutant of the application in the preparation of a cyclosporin a detection reagent.
According to some embodiments, there is provided the use of a conjugate of the application in the preparation of a cyclosporin a detection reagent.
In specific embodiments, the detection reagent is selected from the group consisting of: ELISA detection reagent, chemiluminescent detection reagent, homogeneous ELISA detection reagent and latex enhanced turbidimetry detection reagent.
In a specific embodiment, the detection reagent is preferably a reagent for competition-based detection.
According to some embodiments, there is provided the use of a conjugate of the application in the preparation of a cyclosporin a detection device.
In particular embodiments, the detection device may be prepared in the form of a well plate (e.g., 96-well plate), such as a plate coated with reagents according to the application.
In a specific embodiment, the detection device may be prepared in the form of particles (e.g. latex, magnetic beads), such as particles coated with the reagent according to the application.
According to some embodiments, there is provided a cyclosporine a detection kit comprising:
-a first reagent comprising a substrate, a buffer and a cyclosporine a antibody; the substrate is a substrate for glucose-6-phosphate dehydrogenase;
-a second agent comprising a conjugate of the application and a buffer;
-optionally, a calibrator comprising 10mM to 500mM buffer, 0ng/ml to 1500ng/ml cyclosporin a; and
-optionally, a quality control comprising 10mM to 500mM buffer, 20ng/ml to 1400ng/ml cyclosporin a.
According to one embodiment, there is provided a cyclosporine a detection kit comprising:
a first reagent comprising:
10mM to 500mM buffer,
5mM to 50mM substrate,
0.1 to 10. Mu.g/ml of cyclosporin A antibody,
0.05 to 0.5% w/v stabilizer,
0.05 to 0.5% w/v surfactant,
0.05% to 0.5% w/v preservative;
a second reagent comprising:
10mM to 500mM buffer,
0.01. Mu.g/ml to 1. Mu.g/ml of the conjugate according to the application,
0.05 to 0.5% w/v stabilizer,
0.05 to 0.5% w/v surfactant,
0.05% to 0.5% w/v preservative;
in some embodiments, the buffer is selected from one or a combination of the following: TAPS, tromethamine buffer, phosphate buffer, tris-HCl buffer, citric acid-sodium citrate buffer, barbital buffer, glycine buffer, borate buffer, and trimethylol methane buffer; preferably, a phosphate buffer; the concentration of the buffer is 10mmol/L to 500mmol/L, preferably 50 to 100mM; the pH of the buffer is 7 to 8.4.
In some embodiments, the stabilizer is selected from one or a combination of the following: bovine serum albumin, trehalose, glycerol, sucrose, mannitol, glycine, arginine, polyethylene glycol 6000, polyethylene glycol 8000; bovine serum albumin is preferred.
In some embodiments, the surfactant is selected from one or a combination of the following: brij23, brij35, triton X-100, triton X-405, tween20, tween30, tween80, coconut fatty acid diethanolamide, AEO7, preferably Tween80.
In some embodiments, the preservative is selected from one or a combination of the following: azide, MIT, biological preservative PC (such as PC 300), merthiolate; the azide is selected from: sodium azide and lithium azide.
In some embodiments, the substrate comprises: glucose-6-phosphate, beta-nicotinamide adenine dinucleotide.
In some specific embodiments, the cyclosporine a antibody is derived from: mice, rats, cats, dogs, primates, cows, horses, sheep, camelids, birds, humans.
In some specific embodiments, the cyclosporine a antibody is selected from the group consisting of: monoclonal antibodies, polyclonal antibodies, recombinant antibodies, chimeric antibodies, and antigen binding fragments.
According to some embodiments, there is provided a method of preparing a conjugate comprising the steps of:
1) Providing a cyclosporine a derivative according to the application, in particular in an aprotic solvent (such as, but not limited to, acetonitrile, dimethylformamide, dimethylsulfoxide);
2) Providing a glucose 6-phosphate dehydrogenase mutant, preferably in a buffer (which provides a reaction environment such as, but not limited to PBS, tris, TAPS, TAPSO, said buffer having a pH of 6.0 to 8.0);
3) Contacting said cyclosporin a derivative and said glucose 6-phosphate dehydrogenase mutant in a molar ratio n:1 at 18 ℃ to 28 ℃ for 1 hour to 4 hours (preferably 2 hours to 3 hours) such that coupling of said cyclosporin a derivative and said glucose 6-phosphate dehydrogenase mutant occurs, resulting in said seed conjugate;
4) The seed conjugate is optionally purified, e.g., desalted, etc., as desired.
In some embodiments, the contacting molar ratio of enzyme to hapten in the reaction system is 1: n, wherein n is 1 to 500, e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 100, 200, 300, 400, 500, and ranges between any of the foregoing values thereof; preferably n is 20 to 60.
In some specific embodiments, steps 1) and 2) may be interchanged or in parallel.
In some specific embodiments, the glucose 6-phosphate dehydrogenase comprises one or more free sulfhydryl groups prior to coupling, thereby allowing for a directed reaction with cyclosporin a.
Wild-type glucose 6-phosphate dehydrogenase does not contain a free thiol group, and thus in some specific embodiments, the glucose 6-phosphate dehydrogenase is genetically engineered to have an amino acid mutation at a particular site (306, 375, or 426) to a cysteine, thereby carrying a free thiol group.
Drawings
FIG. 1G 6PDH (wild type) amino acid sequence (SEQ ID No. 1); is derived from Leuconostoc pseudoenteroides Leuconostoc pseudomesenteroides.
FIG. 2G 6PDH (D306C) amino acid sequence (SEQ ID No. 2).
FIG. 3G 6PDH (D375C) amino acid sequence (SEQ ID No. 3).
FIG. 4G 6PDH (G426C) amino acid sequence (SEQ ID No. 4).
Detailed Description
Examples
EXAMPLE 1 Synthesis of cyclosporin A derivatives
1. Synthesis of Compound 2
Cyclosporin A (100 mg,0.08 mmol) was added to a round bottom flask, dissolved in dry dichloromethane (5 mL), triethylamine (25 mg,0.25 mmol) was added to the reaction system and stirred until all dissolved.
Oxalyl chloride (52.8 mg,0.42 mmol) was added to the reaction system, stirred at room temperature, checked by TLC, reacted at room temperature (18-28 ℃ C., preferably 20-25 ℃ C.) for about 1 hour, the starting material was substantially disappeared, the solvent was removed under reduced pressure, and the excess oxalyl chloride was carried over with DCM (2-3 times) and used in the next step without purification.
2. Synthesis of cyclosporin A derivatives
Compound 2 and compound 3 (10 mg,0.05 mmol) are dissolved in dry dichloromethane (5 mL), triethylamine (12.4 mg,0.12 mmol) is added dropwise thereto, stirred at room temperature (18-28 ℃, preferably 20 to 25 ℃) and detected by TLC. Purification directly with prep plate (MeOH/dcm=1:20) gave the cyclosporine a derivative of formula III (45 mg, 38% yield).
3. The structure of the product was confirmed by a conventional method. This example gives cyclosporin a with a group that can bind to enzymes.
EXAMPLE 2 coupling of cyclosporine A derivative to G6PDH molecule
1. The coupling method of the application
The G6 PDH-cyclosporine A conjugate according to the application is coupled as follows: thiol-reactive groups (such as but not limited to maleimide groups) on cyclosporine a derivative molecules are covalently bound to thiol groups on G6PDH molecules.
1. The cyclosporin a derivative prepared in example 1 was dissolved in N, N-dimethylformamide (10 mg/ml);
g6pdh solution: g6PDH (mutant of the application or mutant of the prior art) was dissolved in 0.2M phosphate buffer, pH 8.0 (2.5 mg/ml enzyme);
3. mu.l of glucose 6 phosphate dehydrogenase mutant solution was added to 50. Mu.l of cyclosporin A derivative solution;
4. the mixed solution is fully shaken for 2-3 hours at room temperature (18-28 ℃, preferably 20-25 ℃) and subjected to molecular sieve chromatography, and the obtained product is G6 PDH-cyclosporine A conjugate (the concentration is 0.1mg/mL-2.5 mg/mL).
2. Control coupling method
G6 PDH-cyclosporin A conjugates were prepared by the methods disclosed in the examples of CN 107782889A.
EXAMPLE 3 preparation of the kit
The following kit for detecting cyclosporine a was prepared, which comprises:
reagent R1 comprising:
tris buffer 100mM, pH7.4
20mM glucose 6-phosphate
20mM beta-nicotinamide adenine dinucleotide
1 μg/ml cyclosporin A antibody (commercially available antibody)
0.5% w/v bovine serum albumin
0.1%w/v Tween80
0.1%w/v PC300;
Reagent R2, comprising:
tris buffer 100mM, pH8.2
0.05 μg/ml G6 PDH-cyclosporin A conjugate
0.5% w/v bovine serum albumin
0.1%w/v Tween 80
0.1%w/v PC300;
Sample extract: zinc sulfate 50mM, tris buffer 50mM, PC300 0.1% w/v, methanol 50% w/v;
calibration material: whole blood matrix, 0ng/ml, 50ng/ml, 300ng/ml, 600ng/ml, 900ng/ml, 1500ng/ml cyclosporin A (or added as needed);
quality control product: whole blood matrix, 100ng/ml, 750ng/ml, 1300ng/ml cyclosporin A (or added as needed).
The above reagents (optionally including quality control substances and calibration materials) are assembled into a detection kit.
The calibrator, the quality control product and the sample to be measured are physiological samples, such as serum, plasma, whole blood and the like. Preferably, the calibrator, the quality control product and the sample to be tested are all whole blood matrixes, and sample extraction liquid is used for pretreatment before testing.
Test case
The kit adopts the enzyme amplification immunoassay EMIT principle, namely free CsA in a sample and enzyme-CsA conjugate competitively binds to CsA antibody. The more free CsA in the sample, the more antibody bound, the more free conjugate. The free conjugate catalyzes the oxidation of beta-Nicotinamide Adenine Dinucleotide (NAD) + ) And converting into beta-nicotinamide adenine dinucleotide reduction (NADH), wherein the concentration of CsA in the sample is in direct proportion to the generation amount of NADH, and the content of CsA can be calculated through the change of the absorbance at 340 nm.
TABLE 1 full automatic Biochemical instrument parameters
Model type | Hitachi 7180 parameter |
Sample size | 2.0μl |
Reagent R1 | 150μl |
Reagent R2 | 50μl |
Reading point | 27-34 points |
Detection wavelength (Main) | 340nm |
Detection wavelength (auxiliary) | 410nm |
Curve fitting mode | Spline |
Calibration material | 0.0、50.0、300.0、600.0、900.0、1500.0ng/ml |
Sample of | Samples to be tested, e.g. plasma, serum, whole blood, urine, etc |
Test example 1. Performance of the kit of the application
1. Scaling absorbance
TABLE 2 calibration absorbance
2. Precision experiments
And (3) measuring high, medium and low quality control products and clinical samples by using the calibration curve established above.
TABLE 3 Total imprecision
3. Repeatability of
And (5) carrying out repeated experiments on the quality control products with low, medium and high values for 20 times. As shown in the table below, the sample test was repeated 20 times with a CV of less than 2.35%.
TABLE 4 reproducibility of the kit
4. Recovery of
TABLE 5 recovery
5. Linearity of detection kit
TABLE 6 linearity
6.37℃reagent accelerated stability
TABLE 7 accelerated stability of reagents at 37℃
7. Drug interference experiment
The interferents were selected to produce a systematic deviation of less than 10% at cyclosporin A concentrations of 200-1000 ng/ml.
TABLE 8 drug interference experiment
Medicament | Test concentration (μg/mL) |
Alprazole bin | 0.57 |
Digoxin | 0.015 |
Carbamazepine (Kamahalanobis) | 100 |
Gentamicin | 150 |
Rapamycin (rapamycin) | 0.25 |
Tacrolimus | 0.25 |
Salicylic acid | 400 |
Theophylline | 200 |
Valproic acid | 600 |
Vancomycin | 500 |
Immunoglobulin protein | 8500 |
Isoprenaline hydrochloride | 0.4 |
Phenobarbital | 200 |
Aminobenzene naphthyridine | 5.0 |
Salbutamol | 0.15 |
Weifuan for curing stomach disease | 4 |
Nitroglycerin | 3.5 |
Detection example 2 antibody inhibition Rate
1. Principle of detection of antibody inhibition
When the antibody is combined with the G6 PDH-cyclosporin A conjugate, the activity of G6PDH enzyme is influenced due to steric hindrance, so that the efficiency of catalyzing NAD to be converted into NADH is reduced, and the difference between an added antibody and an experimental group without the added antibody is compared by detecting the change of the NADH amount, wherein the difference is expressed as the inhibition capability of the antibody on G6 PDH.
2. Reaction system
TABLE 9 preparation of reagents for detection of antibody inhibition
3. Results
And comparing the absorbance measurement value of the G6 PDH-cyclosporine A conjugate when the antibody is added with the antibody is not added with the antibody, and obtaining the inhibition condition of the antibody on the G6 PDH.
Compared with the conjugate prepared by the published mutation site (A45C, K C), the mutant of the application has obviously improved antibody inhibition rate, and can reach more than 44% (G426C: 44%; D375C: 50%), up to 63% (D306C). Whereas the inhibition rate of the previously published mutation site (e.g.A45C, K55C) is 40% to 43%.
While not being limited to a particular theory, it may be explained in part as: in comparison with the G6PDH mutant (A45C, K C) in the prior art, the mutation site (i.e. the site for introducing free sulfhydryl) in the enzyme mutant is the coupling site with hapten (such as hormone, small molecule drug, etc.). When hapten is combined with hapten specific antibody at this position, the steric hindrance formed has the greatest effect on the activity of G6PDH enzyme, and after mutation is introduced, the steric folding of the molecule cannot be substantially influenced. Therefore, the position of this mutation site is very important, and it is necessary to combine the activity of the G6PDH enzyme, the spatial folding of the coupling molecule, and the sufficient exposure of the hapten epitope.
The mutant of the enzyme has obvious improvement on the inhibition rate of the antibody. After the conjugate of the enzyme mutant and cyclosporine A is prepared into a kit, the reagent has obvious performance improvement in the aspects of the inter-batch variation coefficient, linearity, specificity and the like.
Claims (1)
1. Use of a conjugate in the preparation of a homogeneous enzyme immunoassay detection reagent for cyclosporin a, wherein:
the conjugate is prepared from a glucose 6-phosphate dehydrogenase mutant and a cyclosporine A derivative according to a molar ratio of 1:1, covalent coupling;
the cyclosporine A derivative is represented by formula I:
wherein, the liquid crystal display device comprises a liquid crystal display device,
CsA isShown;
m is an integer from 1 to 10, preferably an integer from 1 to 3;
preferably, the cyclosporine a derivative is represented by formula III:
the glucose 6-phosphate dehydrogenase mutant comprises any one of the mutations selected from the group consisting of: d306C, D375C, G426C;
the glucose 6-phosphate dehydrogenase mutant is represented by any one of the following sequences: SEQ ID No.2, SEQ ID No.3, SEQ ID No.4.
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CN202310726493.6A Pending CN116773795A (en) | 2019-01-09 | 2019-12-31 | Preparation method of conjugate |
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CN202010000321.7A Active CN111487206B (en) | 2019-01-09 | 2020-01-02 | Glucose 6-phosphate dehydrogenase mutant and application thereof in preparation of vancomycin detection reagent |
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CN202010009771.2A Active CN111504921B (en) | 2019-01-09 | 2020-01-06 | 6-glucose phosphate dehydrogenase mutant and application thereof in preparation of gentamicin detection reagent |
CN202310320137.4A Pending CN116148198A (en) | 2019-01-09 | 2020-01-06 | Preparation method of gentamicin detection reagent |
CN202310452740.8A Pending CN116430056A (en) | 2019-01-09 | 2020-01-06 | Method for preparing conjugate |
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CN202010009570.2A Active CN111537451B (en) | 2019-01-09 | 2020-01-06 | Glucose 6-phosphate dehydrogenase mutant and application thereof in preparation of tacrolimus detection reagent |
CN202310453290.4A Pending CN116338215A (en) | 2019-01-09 | 2020-01-06 | Tacrolimus detection kit |
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CN202310554774.8A Pending CN116679047A (en) | 2019-01-09 | 2020-01-07 | Method for preparing conjugate |
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CN202010017376.9A Active CN111537452B (en) | 2019-01-09 | 2020-01-08 | Glucose 6-phosphate dehydrogenase mutant and application thereof in preparation of amikacin detection reagent |
CN202310725902.0A Pending CN116577494A (en) | 2019-01-09 | 2020-01-08 | Use of conjugates in the preparation of detection reagents |
CN202010016535.3A Active CN111693473B (en) | 2019-01-09 | 2020-01-08 | Glucose 6-phosphate dehydrogenase mutant and application thereof in preparation of rapamycin detection reagent |
CN202310726230.5A Pending CN116577495A (en) | 2019-01-09 | 2020-01-08 | Method for preparing conjugate |
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