CN117088983A - Anti-amphetamine antibodies, reagents and kits for detecting amphetamine - Google Patents

Anti-amphetamine antibodies, reagents and kits for detecting amphetamine Download PDF

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CN117088983A
CN117088983A CN202210509728.1A CN202210509728A CN117088983A CN 117088983 A CN117088983 A CN 117088983A CN 202210509728 A CN202210509728 A CN 202210509728A CN 117088983 A CN117088983 A CN 117088983A
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CN117088983B (en
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孟媛
钟冬梅
游辉
曹慧方
覃文新
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Dongguan Pengzhi Biotechnology Co Ltd
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Abstract

The application discloses an anti-amphetamine antibody, a reagent for detecting amphetamine and a kit, and relates to the technical field of antibodies. The anti-amphetamine antibodies disclosed herein comprise a heavy chain complementarity determining region and a light chain complementarity determining region. The antibodies provide an important source of raw materials for the detection of amphetamine and have improved affinity and activity.

Description

Anti-amphetamine antibodies, reagents and kits for detecting amphetamine
Technical Field
The application relates to the technical field of antibodies, in particular to an anti-amphetamine antibody, a reagent for detecting amphetamine and a kit.
Background
Amphetamine (AMPH), also known as Amphetamine, alpha-methylphenylamine, amphetamine, and Amphetamine, has a chemical formula of C9H13N, is a prototype of a series of synthetic drugs with remarkable excitation effect on central nervous system, and is a central excitation and antidepressant drug commonly used in clinic. Amphetamines belong to amphetamine class of stimulant drugs and were listed as illicit drugs by the united nations anti-toxin agency as early as 1971, belonging to the national drug line.
At present, the detection method of amphetamine mainly comprises a colloidal gold immunochromatography method, has the advantages of rapidness, simplicity in operation and the like, is an immunological detection method based on the specific reaction of antibodies and antigens, and simultaneously utilizes colloidal gold to amplify and display detected signals, and the acquisition of anti-amphetamine antibodies is a key for developing colloidal gold immunochromatography test paper. Thus, there is a strong need in the art for antibodies that are effective and bind to amphetamine and detect it.
In view of this, the present application has been made.
Disclosure of Invention
The application provides an anti-amphetamine antibody with improved affinity and/or activity, so as to improve the detection of amphetamine, and provide an important raw material source for the detection of amphetamine.
In order to achieve the above object, according to one aspect of the present application, there is provided an antibody or a functional fragment thereof comprising HCDR1, HCDR2, HCDR3 having amino acid sequences shown in SEQ ID NO. 1 to SEQ ID NO. 3, and LCDR1 having amino acid sequences shown in SEQ ID NO. 4 or 15, LCDR2 having amino acid sequences shown in SEQ ID NO. 5, LCDR3 having amino acid sequences shown in SEQ ID NO. 6.
In order to achieve the above object, according to a second aspect of the present application, there is provided an anti-amphetamine antibody or a functional fragment thereof, which comprises a heavy chain variable region comprising the sequence structure of HFR1-HCDR1-HFR2-HCDR2-HFR3-HCDR3-HFR4 and/or a light chain variable region comprising the sequence structure of LFR1-LCDR1-LFR2-LCDR2-LFR3-LCDR3-LFR4, wherein the amino acid sequences of HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, LCDR3 are the amino acid sequences of HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, LCDR3 described above.
In order to achieve the above object, according to a third aspect of the present application, there is provided an anti-amphetamine antibody comprising a heavy chain comprising the heavy chain variable region described above and/or a light chain comprising the light chain variable region described above.
In order to achieve the above object, according to a fourth aspect of the present application, there is provided an antibody conjugate comprising the above antibody or a functional fragment thereof.
In order to achieve the above object, according to a fifth aspect of the present application, there is provided a reagent or kit for detecting amphetamine, the reagent or kit comprising the above antibody or a functional fragment thereof or the above antibody conjugate.
In order to achieve the above object, the present application also provides a vector, a cell and a method for preparing the above antibody or a functional fragment thereof.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows the results of reducing SDS-PAGE of Anti-AMPH-35B3mut1 to Anti-AMPH-35B3mut 7.
Detailed Description
The application provides an antibody or a functional fragment thereof, which comprises HCDR1, HCDR2 and HCDR3 with amino acid sequences shown in SEQ ID NO. 1-3, and LCDR1 with amino acid sequences shown in SEQ ID NO. 4 or 15, LCDR2 with amino acid sequences shown in SEQ ID NO. 5 and LCDR3 with amino acid sequences shown in SEQ ID NO. 6. The antibodies have improved affinity and/or activity.
In the present application, the term "antibody" is used in the broadest sense and may include full length monoclonal antibodies, bispecific or multispecific antibodies, and chimeric antibodies so long as they exhibit the desired biological activity.
In the present application, the terms "complementarity determining regions", "CDRs" or "CDRs" refer to the highly variable regions of the heavy and light chains of immunoglobulins, and refer to regions comprising one or more or even all of the major amino acid residues responsible for the binding of an antibody or antigen-binding fragment to the antigen or epitope recognized by it. In a specific embodiment of the application, CDRs refer to the highly variable regions of the heavy and light chains of the antibody.
In the present application, the heavy chain complementarity determining region is represented by HCDR, which includes HCDR1, HCDR2 and HCDR3; the light chain complementarity determining regions are denoted by LCDR and include LCDR1, LCDR2 and LCDR3. CDR labeling methods commonly used in the art include: the Kabat numbering scheme, the IMGT numbering scheme, the Chothia and Lesk numbering schemes, and the 1997 Lefranc et al, all protein sequences of the immunoglobulin superfamily. Kabat et al were the first to propose a standardized numbering scheme for immunoglobulin variable regions. Over the past few decades, the accumulation of sequences has led to the creation of Kabat numbering schemes, which are generally considered as widely adopted criteria for numbering antibody residues. The application adopts Kabat annotation standard to mark CDR regions, but other methods to mark CDR regions also belong to the protection scope of the application.
In the present application, a "framework region" or "FR" region includes a heavy chain framework region and a light chain framework region, and refers to regions other than CDRs in an antibody heavy chain variable region and a light chain variable region; wherein the heavy chain framework regions can be further subdivided into contiguous regions separated by CDRs comprising HFR1, HFR2, HFR3 and HFR4 framework regions; the light chain framework regions may be further subdivided into contiguous regions separated by CDRs comprising LFR1, LFR2, LFR3 and LFR4 framework regions.
In the present application, the heavy chain variable region is obtained by connecting the following numbered CDRs with FRs in the following combination arrangement: HFR1-HCDR1-HFR2-HCDR2-HFR3-HCDR3-HFR 4; the light chain variable region is obtained by ligating the following numbered CDRs with the FR in the following combination arrangement: LFR1-LCDR1-LFR2-LCDR2-LFR3-LCDR3-LFR4.
In alternative embodiments, the antibody or functional fragment thereof further comprises HFR1, HFR2, HFR3, HFR4 having amino acid sequences shown in SEQ ID NO. 7 through SEQ ID NO. 10, and LFR1, LFR2, LFR3 and LFR4 having amino acid sequences shown in SEQ ID NO. 11 through SEQ ID NO. 14.
In other embodiments, each of the framework region amino acid sequences of the antibodies or functional fragments thereof provided herein may have at least 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identity to the corresponding framework region (SEQ ID NO:7, 8, 9, 10, 11, 12, 13 or 14) described above.
In an alternative embodiment, the antibody or functional fragment thereof has a KD of 10 or less -7 M、KD≤10 -8 M、KD≤10 - 9 M、 KD≤10 -10 M、KD≤10 -11 The affinity of M binds amphetamine.
In an alternative embodiment, the antibody or functional fragment thereof has a KD of 9.31X10 ∈ -10 The affinity of M binds amphetamine.
In an alternative embodiment, the antibody or functional fragment thereof has a KD of 3.98X10 ∈ -11 The affinity of M binds amphetamine.
In an alternative embodiment, the amino acid sequence of LFR1 of said antibody or functional fragment thereof is shown in SEQ ID NO. 16.
In an alternative embodiment, the amino acid sequence of LFR2 of said antibody or functional fragment thereof is shown in SEQ ID NO. 17.
In another aspect, embodiments of the present application provide an anti-amphetamine antibody or a functional fragment thereof, the antibody or functional fragment thereof comprising a heavy chain variable region comprising the sequence structure of HFR1-HCDR1-HFR2-HCDR2-HFR3-HCDR3-HFR4 and/or a light chain variable region comprising the sequence structure of LFR1-LCDR1-LFR2-LCDR2-LFR3-LCDR3-LFR4, wherein the amino acid sequence of HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, LCDR3 is the amino acid sequence of HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, LCDR3, the amino acid sequence of HFR1, HFR2, HFR3, HFR4, LFR1, HFR2, LFR3, r4 is the amino acid sequence of HFR1, HFR2, HFR3, LFR4, LFR2, LFR4, or the amino acid sequence of HCDR1, HCDR 3.
In an alternative embodiment, the heavy chain variable region amino acid sequence is set forth in SEQ ID NO. 20.
In an alternative embodiment, the light chain variable region amino acid sequence is set forth in any one of SEQ ID NOs 21 to 28.
In alternative embodiments, the antibody further comprises a constant region.
In alternative embodiments, the constant region comprises a heavy chain constant region and/or a light chain constant region.
In alternative embodiments, the heavy chain constant region is selected from the group consisting of an IgG1, igG2, igG3, igG4, igA, igM, igE, or IgD heavy chain constant region, and the light chain constant region is selected from the group consisting of kappa-type or lambda-type light chain constant regions.
In alternative embodiments, the constant region is of a species derived from a cow, horse, cow, pig, sheep, rat, mouse, dog, cat, rabbit, donkey, deer, mink, chicken, duck, goose, turkey, chicken, or human.
In an alternative embodiment, the constant region is of murine species origin.
In an alternative embodiment, the heavy chain constant region sequence (CH) is shown in SEQ ID NO. 18 and the light chain constant region (CL) sequence is shown in SEQ ID NO. 19.
In other embodiments, the constant region sequence may have at least 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identity to the constant region (SEQ ID NO:18 or 19) described above.
In alternative embodiments, the functional fragment is selected from any one of F (ab ') 2, fab', fab, fv, and scFv of the antibody.
The functional fragments of the above antibodies generally have the same binding specificity as the antibody from which they were derived. It will be readily appreciated by those skilled in the art from the disclosure herein that functional fragments of the above antibodies may be obtained by methods such as enzymatic digestion (including pepsin or papain) and/or by methods of chemical reduction cleavage of disulfide bonds. The above functional fragments are readily available to those skilled in the art based on the disclosure of the structure of the intact antibodies.
Functional fragments of the above antibodies may also be synthesized by recombinant genetic techniques also known to those skilled in the art or by, for example, automated peptide synthesizers such as those sold by Applied BioSystems and the like.
In another aspect, the application provides an anti-amphetamine antibody comprising a heavy chain variable region as described above and a heavy chain constant region as described above; the light chain comprises the light chain variable region described above and the light chain constant region described above.
In an alternative embodiment, the amino acid sequence of the heavy chain is shown in SEQ ID NO. 29.
In an alternative embodiment, the amino acid sequence of the light chain is as shown in any one of SEQ ID NOs 30 to 37.
In another aspect, the application provides an antibody conjugate comprising an antibody or functional fragment thereof as described above.
In an alternative embodiment, the antibody or functional fragment thereof in the above antibody conjugate is labeled with a label.
In an alternative embodiment, the above-mentioned marker refers to a substance having a property such as luminescence, color development, radioactivity, etc., which can be directly observed by naked eyes or detected by an instrument, by which qualitative or quantitative detection of the corresponding target can be achieved.
In alternative embodiments, the labels include, but are not limited to, fluorescent dyes, enzymes, radioisotopes, chemiluminescent reagents, and nanoparticle-based labels.
In the actual use process, a person skilled in the art can select a suitable marker according to the detection conditions or actual needs, and no matter what marker is used, the marker belongs to the protection scope of the application.
In alternative embodiments, the fluorescent dyes include, but are not limited to, fluorescein-based dyes and derivatives thereof (including, but not limited to, fluorescein Isothiocyanate (FITC) hydroxy-light (FAM), tetrachlorolight (TET), and the like, or analogs thereof), rhodamine-based dyes and derivatives thereof (including, but not limited to, red Rhodamine (RBITC), tetramethyl rhodamine (TAMRA), rhodamine B (TRITC), and the like, or analogs thereof), cy-based dyes and derivatives thereof (including, but not limited to, cy2, cy3B, cy3.5, cy5, cy5.5, cy3, and the like, or analogs thereof), alexa-based dyes and derivatives thereof (including, but not limited to, alexa fluor350, 405, 430, 488, 532, 546, 555, 568, 594, 610, 33, 647, 680, 700, 750, and the like, or analogs thereof), and protein-based dyes and derivatives thereof (including, but not limited to, for example, phycoerythrin (PE), phycocyanin (PC), allophycocyanin (APC), polyazosin (chlorophyll), and the like).
In alternative embodiments, the enzymes include, but are not limited to, horseradish peroxidase, alkaline phosphatase, beta-galactosidase, glucose oxidase, carbonic anhydrase, acetylcholinesterase, and glucose 6-phosphate deoxygenase.
In alternative embodiments, the radioisotope includes, but is not limited to 212 Bi、 131 I、 111 In、 90 Y、 186 Re、 211 At、 125 I、 188 Re、 153 Sm、 213 Bi、 32 P、 94 mTc、 99 mTc、 203 Pb、 67 Ga、 68 Ga、 43 Sc、 47 Sc、 110 mIn、 97 Ru、 62 Cu、 64 Cu、 67 Cu、 68 Cu、 86 Y、 88 Y、 121 Sn、 161 Tb、 166 Ho、 105 Rh、 177 Lu、 172 Lu and 18 F。
in alternative embodiments, the chemiluminescent reagents include, but are not limited to, luminol and its derivatives, lucigenin, crustacean fluorescein and its derivatives, ruthenium bipyridine and its derivatives, acridinium esters and its derivatives, dioxane and its derivatives, lomustine and its derivatives, and peroxyoxalate and its derivatives.
In alternative embodiments, the nanoparticle-based labels include, but are not limited to, nanoparticles, colloids, organic nanoparticles, magnetic nanoparticles, quantum dot nanoparticles, and rare earth complex nanoparticles.
In alternative embodiments, the colloids include, but are not limited to, colloidal metals, disperse dyes, dye-labeled microspheres, and latex.
In alternative embodiments, the colloidal metals include, but are not limited to, colloidal gold, colloidal silver, and colloidal selenium.
In an alternative embodiment, the antibody or functional fragment thereof in the above antibody conjugate is coated onto a solid phase.
In alternative embodiments, the solid phase is selected from the group consisting of microspheres, plates, and membranes.
In alternative embodiments, the solid phase includes, but is not limited to, magnetic microspheres, plastic microparticles, microplates, glass, capillaries, nylon, and nitrocellulose membranes.
In an alternative embodiment, the solid phase is a nitrocellulose membrane.
In another aspect, the application provides a reagent or kit for detecting amphetamine, the reagent or kit comprising an antibody or functional fragment thereof as described above or an antibody conjugate as described above.
In another aspect, the application provides the use of an antibody as described above or a functional fragment thereof, an antibody conjugate, or a reagent or kit as described above in the detection of amphetamine.
In another aspect, the application provides a nucleic acid molecule encoding an antibody or functional fragment thereof as described above.
In another aspect, the application provides a vector comprising the nucleic acid molecule described above.
In another aspect, the application provides a cell comprising the vector described above.
In another aspect, the application provides a method of making an antibody or functional fragment thereof comprising: the cells as described above were cultured.
On the basis of the present application, which discloses the amino acid sequence of an antibody or a functional fragment thereof, it is easy for a person skilled in the art to prepare the antibody or the functional fragment thereof by genetic engineering techniques or other techniques (chemical synthesis, recombinant expression), for example, by separating and purifying the antibody or the functional fragment thereof from a culture product of recombinant cells capable of recombinantly expressing the antibody or the functional fragment thereof according to any one of the above, and on the basis of this, it is within the scope of the present application to prepare the antibody or the functional fragment thereof by any technique.
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of formulations or unit doses herein, some methods and materials are now described. Unless otherwise indicated, techniques employed or contemplated herein are standard methods. The materials, methods, and examples are illustrative only and not intended to be limiting.
Unless otherwise indicated, practice of the present application will employ conventional techniques of cell biology, molecular biology (including recombinant techniques), microbiology, biochemistry and immunology, which are within the ability of a person skilled in the art. This technique is well explained in the literature, as is the case for molecular cloning: laboratory Manual (Molecular Cloning: A Laboratory Manual), second edition (Sambrook et al, 1989); oligonucleotide Synthesis (Oligonucleotide Synthesis) (M.J.Gait et al, 1984); animal cell culture (Animal Cell Culture) (r.i. freshney, 1987); methods of enzymology (Methods in Enzymology) (Academic Press, inc.), experimental immunology handbook (Handbook of Experimental Immunology) (D.M.Weir and C.C.Blackwell, inc.), gene transfer vectors for mammalian cells (Gene Transfer Vectors for Mammalian Cells) (J.M.Miller and M.P.calos, inc., 1987), methods of contemporary molecular biology (Current Protocols in Molecular Biology) (F.M.Ausubel et al, inc., 1987), PCR: polymerase chain reaction (PCR: the Polymerase Chain Reaction, inc., 1994), and methods of contemporary immunology (Current Protocols in Immunology) (J.E.Coligan et al, 1991), each of which is expressly incorporated herein by reference.
The features and capabilities of the present application are described in further detail below in connection with the examples.
Example 1 preparation of Anti-AMPH-35B3 monoclonal antibody
Restriction enzymes, prime Star DNA polymerase in this example were purchased from Takara Corp. MagExtractor-RNA extraction kit was purchased from TOYOBO company. BD SMART TM RACE cDNA Amplification Kit kit was purchased from Takara. pMD-18T vector was purchased from Takara. Plasmid extraction kits were purchased from Tiangen. Primer synthesis and gene sequencing were accomplished by Invitrogen corporation.
1 construction of recombinant plasmid
(1) Antibody Gene production
mRNA is extracted from hybridoma cell strains secreting anti-amphetamine monoclonal antibodies, DNA products are obtained through an RT-PCR method, rTaq DNA polymerase is used for carrying out an A adding reaction on the products, the products are inserted into a pMD-18T vector and are transformed into DH5 alpha competent cells, after colonies grow out, the Heavy Chain gene clone and the Light Chain gene clone are respectively taken, and 4 clones are sent to a gene sequencing company for sequencing.
(2) Sequence analysis of variable region Gene of Anti-AMPH-35B3 antibody
The gene sequence obtained by sequencing is placed in a Kabat antibody database for analysis, and VNTI11.5 software is utilized for analysis to determine that the genes amplified by the heavy Chain primer pair and the Light Chain primer pair are correct, wherein in the gene fragment amplified by the Light Chain, the VL gene sequence is 333bp, and a leader peptide sequence of 57bp is arranged in front of the VL gene sequence; in the gene fragment amplified by the Heavy Chain primer pair, the VH gene sequence is 363bp, belongs to the VH1 gene family, and a 57bp leader peptide sequence is arranged in front of the VH gene sequence.
(3) Construction of recombinant antibody expression plasmids
pcDNA TM 3.4vector is a constructed eukaryotic expression vector of the recombinant antibody, and the expression vector is introduced into a HindIII, bamHI, ecoRI polyclonal enzyme cutting site, named pcDNA3.4A expression vector and is hereinafter abbreviated as 3.4A expression vector; according to the result of the antibody variable region gene sequencing in pMD-18T, VL and VH gene specific primers of the antibody are designed, hindIII, ecoRI restriction sites and protective bases are respectively arranged at two ends, and a 0.74kb Light Chain gene fragment and a 1.44kb Heavy Chain gene fragment are amplified by a PCR amplification method.
The Heavy Chain gene fragment and the Light Chain gene fragment are respectively cut by HindIII/EcoRI double enzyme, the 3.4A vector is cut by HindIII/EcoRI double enzyme, and the Heavy Chain gene fragment and the Light Chain gene fragment after the fragment and the vector are purified and recovered are respectively connected into the 3.4A expression vector to respectively obtain recombinant expression plasmids of the Heavy Chain gene fragment and the Light Chain gene fragment.
2 stable cell line selection
(1) Recombinant antibody expression plasmid transient transfection CHO cells, determination of expression plasmid activity
The plasmid was diluted to 40ug/100ul with ultrapure water and CHO cells were conditioned to 1.43X 10 7 100. Mu.L of plasmid was mixed with 700. Mu.L of cells in a centrifuge tube, transferred to an electrocuvette, electroblotted, sample counted on days 3, 5, 7, and harvested on day 7.
The coating solution (main component NaHCO 3) was diluted to 2ug/ml with AMPH-BSA (Handson, inc. of HDS-A4014) at 4℃overnight at 100. Mu.L per well; the next day, washing with washing liquid for 2 times, and drying; blocking solution (20% BSA+80% PBS) was added, 120. Mu.L per well, 37℃for 1h, and the mixture was dried by shaking; adding diluted cell supernatant at 100. Mu.L/well, 37℃for 30min (1 h for part of supernatant); washing with washing liquid for 5 times, and drying; adding goat anti-mouse IgG-HRP, 100 mu L of each hole, and 30min at 37 ℃; washing with washing liquid for 5 times, and drying; adding color development solution A (50. Mu.L/hole, containing citric acid+sodium acetate+acetanilide+carbamide peroxide), adding color development solution B (50. Mu.L/hole, containing citric acid+EDTA.2Na+TMB+concentrated HCL),for 10min; adding stop solution (50. Mu.L/well, EDTA. 2Na+ concentrated H) 2 SO 4 ) The method comprises the steps of carrying out a first treatment on the surface of the OD was read on the microplate reader at 450nm (reference 630 nm). The results showed that the reaction OD after 1000-fold dilution of the cell supernatant was still greater than 1.0, and that the reaction OD without cell supernatant was less than 0.1, indicating that the antibodies produced after transient transformation of the plasmid were active on AMPH-BSA.
The reactivity of the cell supernatant with BSA was examined by the same method as described above, and the result showed that the cell supernatant was diluted 1000 times and the reaction OD was less than 0.1, and that the cell supernatant was not added and the reaction OD was less than 0.1, indicating that the antibody produced after transient transformation of the plasmid was inactive against BSA, further proving that the cell supernatant was active against AMPH.
(2) Linearization of recombinant antibody expression plasmids
The following reagents were prepared: buffer 50 mu L, DNA mu g/tube, puv I enzyme 10 mu L, sterile water to 500 mu L, water bath at 37 ℃ for enzyme digestion overnight; firstly, extracting with equal volume of phenol/chloroform/isoamyl alcohol (lower layer) 25:24:1, and then sequentially extracting with chloroform (water phase); precipitating 0.1 times volume (water phase) of 3M sodium acetate and 2 times volume of ethanol on ice, rinsing the precipitate with 70% ethanol, removing organic solvent, completely volatilizing ethanol, re-thawing with appropriate amount of sterilized water, and measuring concentration.
(3) Stable transfection of recombinant antibody expression plasmid and pressure screening of stable cell strain
The plasmid was diluted to 40ug/100ul with ultrapure water and CHO cells were conditioned to 1.43X 10 7 Placing cells/ml in a centrifuge tube, mixing 100 μl of plasmid with 700 μl of cells, transferring into an electrorotor, electrorotating, and counting the next day; 25umol/L MSX 96-well pressure culture for about 25 days.
Observing the clone holes with the cells under a microscope, and recording the confluency; taking culture supernatant, and carrying out sample feeding detection; selecting cell strains with high antibody concentration and relative concentration, turning 24 holes, and turning 6 holes about 3 days; seed preservation and batch culture are carried out after 3 days, and cell density is regulated to be 0.5x10 6 Batch culture was performed with cells/ml,2.2ml, and cell density was 0.3X10 6 Performing seed preservation by using cells/ml and 2 ml; and (3) carrying out sample feeding detection on the culture supernatant of the 6-hole batch culture for 7 days, and selecting cell strains with smaller antibody concentration and smaller cell diameter to transfer TPP for seed preservation and passage.
3 recombinant antibody production
(1) Cell expansion culture
After cell recovery, the cells were first cultured in 125ml shake flasks with an inoculation volume of 30ml and a medium of 100% dynamis and placed in a shaker at a speed of 120r/min at 37℃and with 8% carbon dioxide. Culturing for 72h, inoculating and expanding culture at 50 ten thousand cells/ml inoculating density, and calculating the expanding culture volume according to production requirements, wherein the culture medium is 100% Dynamis culture medium. After that, the culture was spread every 72 hours. When the cell quantity meets the production requirement, the inoculation density is strictly controlled to be about 50 ten thousand cells/ml for production.
(2) Shake flask production and purification
Shake flask parameters: the rotating speed is 120r/min, the temperature is 37 ℃, and the carbon dioxide is 8%. Feeding: feeding was started every day until 72h of culture in shake flasks, hyCloneTM Cell BoostTM Feed a fed-batch was 3% of the initial culture volume every day, feed 7b fed-batch was one thousandth of the initial culture volume every day, and fed-batch was continued until day 12 (day 12 Feed). Glucose was fed at 3g/L on day six. Samples were collected on day 13. Affinity purification was performed using a proteona affinity column. 3 μg of purified antibody was subjected to reducing SDS-PAGE, and the electrophoretogram shows two bands after reducing SDS-PAGE, 1 Mr at 50KD and the other Mr at 28KD.
Example 2 affinity and Activity optimization
The Anti-AMPH-35B3 monoclonal antibody obtained in example 1 has an ability to bind amphetamine, but has insufficient affinity and antibody activity, and thus the applicant has performed directed mutation on the light chain CDR and the heavy chain CDR of the antibody. The method comprises the steps of performing structural simulation of an antibody variable region, structural simulation of an antigen-antibody variable region acting complex, analysis of key amino acids of an antibody and mutation design by using a computer, designing and synthesizing a two-way primer covering a mutation site according to a mutation scheme, synthesizing primers at two ends of target DNA, performing high-fidelity PCR reaction, cloning a PCR product to a vector, and preparing the mutant antibody according to the method described in the example 1. Monoclonal antibodies with remarkably improved affinity and antibody activity are obtained through screening and are named as: anti-AMPH-35B3mut1 to Anti-AMPH-35B3mut 7. The amino acid sequences of the respective monoclonal antibodies are shown in the following table:
TABLE 1 antibody sequences
Example 3 detection of Performance of antibodies
1 affinity assay
Using the AMC sensor, the purified antibody was diluted to 10ug/ml with PBST, and AMPH-BSA (Handson, cat. HDS-A4014) was diluted gradient with PBST:
the operation flow is as follows: equilibration for 60s in buffer 1 (PBST), antibody 300s in antibody solution, incubation for 180s in buffer 2 (PBST), binding for 420s in antigen solution, dissociation for 1200s in buffer 2, sensor regeneration with 10mM pH 1.69GLY solution and buffer 3 (PBST), output data. (KD represents equilibrium dissociation constant, i.e., affinity; kon represents binding rate; kdis represents dissociation rate. PBST major component Na2 HPO4+NaCl+TW-20).
Table 2 affinity data
Sample name KD(M) kon(1/Ms) kdis(1/s)
Control 9.31E-10 2.03E+05 1.89E-04
Anti-AMPH-35B3mut1 3.13E-11 3.19E+05 1.00E-05
Anti-AMPH-35B3mut2 3.32E-11 3.16E+05 1.05E-05
Anti-AMPH-35B3mut3 3.94E-11 3.39E+05 1.33E-05
Anti-AMPH-35B3mut4 2.94E-11 4.89E+05 1.44E-05
Anti-AMPH-35B3mut5 3.67E-11 3.09E+05 1.14E-05
Anti-AMPH-35B3mut6 3.98E-11 3.57E+05 1.42E-05
Anti-AMPH-35B3mut7 3.71E-11 3.42E+05 1.27E-05
2 Activity assay
The coating solution (main component NaHCO 3) was diluted to 2ug/ml with AMPH-BSA (Handson, inc. of HDS-A4014) at 4℃overnight at 100. Mu.L per well; the next day, washing with washing liquid for 2 times, and drying; blocking solution (20% BSA+80% PBS) was added, 120. Mu.l per well, 37℃for 1h, and the mixture was dried by pipetting; adding the diluted monoclonal antibody into the mixture at the temperature of 37 ℃ for 30-60 min at the concentration of 100 mu l/hole; washing with washing liquid for 5 times, and drying; adding goat anti-mouse IgG-HRP, 100 μl per well, 37deg.C, 30min; washing with washing solution (PBS) for 5 times, and drying; adding a color development solution A (50. Mu.l/hole, containing 2.1g/L citric acid, 12.25g/L citric acid, 0.07g/L acetanilide and 0.5g/L carbamide peroxide), and adding a color development solution B (50. Mu.l/hole, containing 1.05g/L citric acid, 0.186 g/LEDTA.2Na, 0.45g/L TMB and 0.2ml/L concentrated HCl) for 10min; adding stop solution (50. Mu.l/well, 0.75 g/EDTA.2Na and 10.2ml/L of concentrated H) 2 SO 4 ) The method comprises the steps of carrying out a first treatment on the surface of the OD was read on the microplate reader at 450nm (reference 630 nm). The results are shown in the following table.
TABLE 3 Activity data
Sample concentration (ng/ml) 31.25 15.625 7.813 3.906 1.953 0
Control 1.169 0.652 0.372 0.233 0.201 0.028
Anti-AMPH-35B3mut1 1.556 0.987 0.623 0.367 0.301 0.032
Anti-AMPH-35B3mut2 1.664 0.978 0.612 0.357 0.277 0.064
Anti-AMPH-35B3mut3 1.532 0.856 0.567 0.309 0.234 0.035
Anti-AMPH-35B3mut4 1.548 0.917 0.579 0.313 0.246 0.075
Anti-AMPH-35B3mut5 1.521 0.834 0.533 0.298 0.201 0.032
Anti-AMPH-35B3mut6 1.539 0.908 0.564 0.305 0.231 0.034
Anti-AMPH-35B3mut7 1.541 0.912 0.583 0.324 0.243 0.023
3 stability assessment
Placing the antibody at 4 ℃ (refrigerator), 80 ℃ (refrigerator) and 37 ℃ (incubator) for 21 days, taking 7 days, 14 days and 21 days samples for state observation, and detecting the activity of the 21 days samples, wherein the result shows that no obvious protein state change is seen for the antibody placed for 21 days under three examination conditions, and the activity is not in a descending trend along with the increase of the examination temperature, thus indicating that the antibody is stable. Table 4 below shows the results of the detection of OD after 21 days of antibody examination.
Table 4 stability data
Sample concentration (ng/ml) 31.25 7.813 0
4 ℃,21 days sample 1.523 0.598 0.011
Sample at-80℃for 21 days 1.578 0.611 0.034
37 ℃ and 21 days of sample 1.511 0.583 0.038
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
The partial amino acid sequence related to the application is as follows:
sequence numbering Sequence fragments
SEQ ID NO:1 SYTMS
SEQ ID NO:2 AITSGYSSTFYPDSVKG
SEQ ID NO:3 DTGHFAYDWF
SEQ ID NO:4 RSSQNLVHSNGNTYLH
SEQ ID NO:5 KVSNRFS
SEQ ID NO:6 FESTHV
SEQ ID NO:15 RSSQNIVHSNGNTYLH
SEQUENCE LISTING
<110> Dongguan City, pengzhi biotechnology Co., ltd
<120> anti-amphetamine antibodies, reagents and kits for detecting amphetamine
<130> P2022052CN01
<160> 37
<170> PatentIn version 3.3
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Asp Thr Gly His Phe Ala Tyr Asp Trp Phe
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Arg Ser Ser Gln Asn Leu Val His Ser Asn Gly Asn Thr Tyr Leu His
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Asp Val Lys Leu Val Glu Ser Gly Gly Gly Leu Val Lys Pro Gly Gly
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Ser Leu Lys Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Arg
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Arg Phe Thr Ile Ser Arg Asp Asp Ala Lys Asn Thr Leu Phe Leu Gln
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys
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Trp Tyr Leu Gln Lys Pro Gly Gln Ser Pro Lys Leu Leu Ile Tyr
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Gly Val Pro Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr
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Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
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Arg Ser Ser Gln Asn Ile Val His Ser Asn Gly Asn Thr Tyr Leu His
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys
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Trp Tyr Ile Gln Lys Pro Gly Gln Ser Pro Lys Leu Leu Ile Tyr
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Ala Lys Thr Thr Ala Pro Ser Val Tyr Pro Leu Ala Pro Val Cys Gly
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Asp Thr Thr Gly Ser Ser Val Thr Leu Gly Cys Leu Val Lys Gly Tyr
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Phe Pro Glu Pro Val Thr Leu Thr Trp Asn Ser Gly Ser Leu Ser Ser
35 40 45
Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Asp Leu Tyr Thr Leu
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Ser Ser Ser Val Thr Val Thr Ser Ser Thr Trp Pro Ser Gln Ser Ile
65 70 75 80
Thr Cys Asn Val Ala His Pro Ala Ser Ser Thr Lys Val Asp Lys Lys
85 90 95
Ile Glu Pro Arg Gly Pro Thr Ile Lys Pro Cys Pro Pro Cys Lys Cys
100 105 110
Pro Ala Pro Asn Leu Leu Gly Gly Pro Ser Val Phe Ile Phe Pro Pro
115 120 125
Lys Ile Lys Asp Val Leu Met Ile Ser Leu Ser Pro Ile Val Thr Cys
130 135 140
Val Val Val Asp Val Ser Glu Asp Asp Pro Asp Val Gln Ile Ser Trp
145 150 155 160
Phe Val Asn Asn Val Glu Val His Thr Ala Gln Thr Gln Thr His Arg
165 170 175
Glu Asp Tyr Asn Ser Thr Leu Arg Val Val Ser Ala Leu Pro Ile Gln
180 185 190
His Gln Asp Trp Met Ser Gly Lys Glu Phe Lys Cys Lys Val Asn Asn
195 200 205
Lys Asp Leu Pro Ala Pro Ile Glu Arg Thr Ile Ser Lys Pro Lys Gly
210 215 220
Ser Val Arg Ala Pro Gln Val Tyr Val Leu Pro Pro Pro Glu Glu Glu
225 230 235 240
Met Thr Lys Lys Gln Val Thr Leu Thr Cys Met Val Thr Asp Phe Met
245 250 255
Pro Glu Asp Ile Tyr Val Glu Trp Thr Asn Asn Gly Lys Thr Glu Leu
260 265 270
Asn Tyr Lys Asn Thr Glu Pro Val Leu Asp Ser Asp Gly Ser Tyr Phe
275 280 285
Met Tyr Ser Lys Leu Arg Val Glu Lys Lys Asn Trp Val Glu Arg Asn
290 295 300
Ser Tyr Ser Cys Ser Val Val His Glu Gly Leu His Asn His His Thr
305 310 315 320
Thr Lys Ser Phe Ser Arg Thr Pro Gly
325
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Arg Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu
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Gln Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe
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Tyr Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg
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Gln Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser
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Thr Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu
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Arg His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser
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Pro Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
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Asp Val Lys Leu Val Glu Ser Gly Gly Gly Leu Val Lys Pro Gly Gly
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Ser Leu Lys Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Arg Ser Tyr
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Thr Met Ser Trp Val Arg Gln Thr Pro Glu Arg Arg Leu Glu Trp Val
35 40 45
Ala Ala Ile Thr Ser Gly Tyr Ser Ser Thr Phe Tyr Pro Asp Ser Val
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Lys Gly Arg Phe Thr Ile Ser Arg Asp Asp Ala Lys Asn Thr Leu Phe
65 70 75 80
Leu Gln Met Ser Ser Leu Lys Ser Glu Asp Thr Ala Met Tyr Tyr Cys
85 90 95
Thr Arg Asp Thr Gly His Phe Ala Tyr Asp Trp Phe Ala Tyr Trp Gly
100 105 110
Gln Gly Thr Leu Val Thr Val Ser Ser
115 120
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
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Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
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Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
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Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
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Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
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Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
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Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
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Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
100 105 110
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
100 105 110
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Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
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Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
100 105 110
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Asp Val Lys Leu Val Glu Ser Gly Gly Gly Leu Val Lys Pro Gly Gly
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Ser Leu Lys Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Arg Ser Tyr
20 25 30
Thr Met Ser Trp Val Arg Gln Thr Pro Glu Arg Arg Leu Glu Trp Val
35 40 45
Ala Ala Ile Thr Ser Gly Tyr Ser Ser Thr Phe Tyr Pro Asp Ser Val
50 55 60
Lys Gly Arg Phe Thr Ile Ser Arg Asp Asp Ala Lys Asn Thr Leu Phe
65 70 75 80
Leu Gln Met Ser Ser Leu Lys Ser Glu Asp Thr Ala Met Tyr Tyr Cys
85 90 95
Thr Arg Asp Thr Gly His Phe Ala Tyr Asp Trp Phe Ala Tyr Trp Gly
100 105 110
Gln Gly Thr Leu Val Thr Val Ser Ser Ala Lys Thr Thr Ala Pro Ser
115 120 125
Val Tyr Pro Leu Ala Pro Val Cys Gly Asp Thr Thr Gly Ser Ser Val
130 135 140
Thr Leu Gly Cys Leu Val Lys Gly Tyr Phe Pro Glu Pro Val Thr Leu
145 150 155 160
Thr Trp Asn Ser Gly Ser Leu Ser Ser Gly Val His Thr Phe Pro Ala
165 170 175
Val Leu Gln Ser Asp Leu Tyr Thr Leu Ser Ser Ser Val Thr Val Thr
180 185 190
Ser Ser Thr Trp Pro Ser Gln Ser Ile Thr Cys Asn Val Ala His Pro
195 200 205
Ala Ser Ser Thr Lys Val Asp Lys Lys Ile Glu Pro Arg Gly Pro Thr
210 215 220
Ile Lys Pro Cys Pro Pro Cys Lys Cys Pro Ala Pro Asn Leu Leu Gly
225 230 235 240
Gly Pro Ser Val Phe Ile Phe Pro Pro Lys Ile Lys Asp Val Leu Met
245 250 255
Ile Ser Leu Ser Pro Ile Val Thr Cys Val Val Val Asp Val Ser Glu
260 265 270
Asp Asp Pro Asp Val Gln Ile Ser Trp Phe Val Asn Asn Val Glu Val
275 280 285
His Thr Ala Gln Thr Gln Thr His Arg Glu Asp Tyr Asn Ser Thr Leu
290 295 300
Arg Val Val Ser Ala Leu Pro Ile Gln His Gln Asp Trp Met Ser Gly
305 310 315 320
Lys Glu Phe Lys Cys Lys Val Asn Asn Lys Asp Leu Pro Ala Pro Ile
325 330 335
Glu Arg Thr Ile Ser Lys Pro Lys Gly Ser Val Arg Ala Pro Gln Val
340 345 350
Tyr Val Leu Pro Pro Pro Glu Glu Glu Met Thr Lys Lys Gln Val Thr
355 360 365
Leu Thr Cys Met Val Thr Asp Phe Met Pro Glu Asp Ile Tyr Val Glu
370 375 380
Trp Thr Asn Asn Gly Lys Thr Glu Leu Asn Tyr Lys Asn Thr Glu Pro
385 390 395 400
Val Leu Asp Ser Asp Gly Ser Tyr Phe Met Tyr Ser Lys Leu Arg Val
405 410 415
Glu Lys Lys Asn Trp Val Glu Arg Asn Ser Tyr Ser Cys Ser Val Val
420 425 430
His Glu Gly Leu His Asn His His Thr Thr Lys Ser Phe Ser Arg Thr
435 440 445
Pro Gly
450
<210> 30
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 30
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215
<210> 31
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 31
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215
<210> 32
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 32
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215
<210> 33
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 33
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215
<210> 34
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 34
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215
<210> 35
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 35
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Leu Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215
<210> 36
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 36
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Leu Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215
<210> 37
<211> 218
<212> PRT
<213> Artificial
<220>
<223> Artificial sequence
<400> 37
Asp Val Val Leu Thr Gln Thr Pro Leu Ser Ile Pro Val Ser Leu Gly
1 5 10 15
Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Asn Ile Val His Ser
20 25 30
Asn Gly Asn Thr Tyr Leu His Trp Tyr Ile Gln Lys Pro Gly Gln Ser
35 40 45
Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro
50 55 60
Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile
65 70 75 80
Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys Phe Glu Ser
85 90 95
Thr His Val Tyr Ala Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg
100 105 110
Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro Ser Ser Glu Gln
115 120 125
Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu Asn Asn Phe Tyr
130 135 140
Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly Ser Glu Arg Gln
145 150 155 160
Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser Lys Asp Ser Thr
165 170 175
Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp Glu Tyr Glu Arg
180 185 190
His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr Ser Thr Ser Pro
195 200 205
Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
210 215

Claims (12)

1. An anti-amphetamine antibody or a functional fragment thereof, characterized in that the antibody or the functional fragment thereof comprises HCDR1, HCDR2 and HCDR3 with amino acid sequences shown in SEQ ID NO. 1 to SEQ ID NO. 3, and LCDR1 with amino acid sequences shown in SEQ ID NO. 4 or 15, LCDR2 shown in SEQ ID NO. 5 and LCDR3 shown in SEQ ID NO. 6.
2. The antibody or functional fragment thereof according to claim 1, wherein the antibody or functional fragment thereof further comprises HFR1, HFR2, HFR3, HFR4 having the amino acid sequences shown in SEQ ID No. 7 to SEQ ID No. 10 and LFR1, LFR2, LFR3 and LFR4 having the amino acid sequences shown in SEQ ID No. 11 to SEQ ID No. 14, or an amino acid sequence having at least 80% identity to each of said sequences;
alternatively, the antibody or functional fragment thereof has a KD of 10 or less -9 The affinity of M binds amphetamine;
optionally, the amino acid sequence of LFR1 of said antibody or functional fragment thereof is shown as SEQ ID NO. 16;
alternatively, the amino acid sequence of LFR2 of said antibody or functional fragment thereof is shown as SEQ ID NO. 17.
3. An anti-amphetamine antibody or a functional fragment thereof, wherein the antibody or the functional fragment thereof comprises a heavy chain variable region comprising the sequence structure of HFR1-HCDR 2-HFR3-HCDR3-HFR4 and/or a light chain variable region comprising the sequence structure of LFR1-LCDR1-LFR2-LCDR2-LFR3-LCDR3-LFR4, wherein the amino acid sequence of HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, LCDR3 is the amino acid sequence of HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, LCDR3 of claim 1, the amino acid sequence of HFR1, HFR2, HFR3, HFR4, LFR1, HFR2, LFR3, LFR4 is the amino acid sequence of HFR1, HFR2, HFR3, LFR4, LFR3, LFR 4;
optionally, the heavy chain variable region has an amino acid sequence shown in SEQ ID NO. 20;
alternatively, the light chain variable region amino acid sequence is set forth in any one of SEQ ID NOs 21 to 28.
4. The antibody or functional fragment thereof according to any one of claims 1 to 3, wherein the antibody or functional fragment thereof further comprises a constant region;
optionally, the constant region comprises a heavy chain constant region and/or a light chain constant region;
alternatively, the heavy chain constant region is selected from the group consisting of the heavy chain constant region of IgG1, igG2, igG3, igG4, igA, igM, igE or IgD; the light chain constant region is selected from a kappa-type or lambda-type light chain constant region;
alternatively, the constant region is of bovine, equine, porcine, ovine, caprine, rat, mouse, canine, feline, rabbit, donkey, deer, mink, chicken, duck, goose, or human origin;
alternatively, the constant region is of mouse species origin;
alternatively, the heavy chain constant region sequence is as shown in SEQ ID NO. 18 or at least 80% identical thereto;
alternatively, the light chain constant region sequence is as shown in SEQ ID NO. 19 or at least 80% identical thereto.
5. The antibody or functional fragment thereof according to any one of claims 1 to 4, wherein the functional fragment is selected from any one of F (ab ') 2, fab', fab, fv and scFv of the antibody.
6. An anti-amphetamine antibody comprising a heavy chain and/or a light chain, wherein the heavy chain comprises the heavy chain variable region of claim 3 and the heavy chain constant region of claim 4; the light chain comprises the light chain variable region of claim 3 and the light chain constant region of claim 4;
optionally, the amino acid sequence of the heavy chain is shown as any one of SEQ ID NO. 29;
alternatively, the amino acid sequence of the light chain is as shown in any one of SEQ ID NOs 30 to 37.
7. An antibody conjugate comprising the antibody or functional fragment thereof of any one of claims 1 to 6;
optionally, the antibody or functional fragment thereof is labeled with a label;
optionally, the label is selected from the group consisting of fluorescent dyes, enzymes, radioisotopes, chemiluminescent reagents, and nanoparticle-based labels;
optionally, the fluorescent dye is selected from fluorescein dye and its derivative, rhodamine dye and its derivative, cy series dye and its derivative, alexa series dye and its derivative, and protein dye and its derivative;
alternatively, the enzyme is selected from horseradish peroxidase, alkaline phosphatase, beta-galactosidase, glucose oxidase, carbonic anhydrase, acetylcholinesterase, and glucose-6-phosphate deoxygenase;
optionally, the radioisotope is selected from 212Bi, 131I, 111In, 90Y, 186Re, 211At, 125I, 188Re, 153Sm, 213Bi, 32P, 94mTc, 99mTc, 203Pb, 67Ga, 68Ga, 43Sc, 47Sc, 110 msin, 97Ru, 62Cu, 64Cu, 67Cu, 68Cu, 86Y, 88Y, 121Sn, 161Tb, 166Ho, 105Rh, 177Lu, 172Lu and 18F;
optionally, the chemiluminescent reagent is selected from luminol and its derivatives, lucigenin, crustacean fluorescein and its derivatives, ruthenium bipyridine and its derivatives, acridinium esters and its derivatives, dioxane and its derivatives, clorine and its derivatives, and peroxyoxalate and its derivatives;
optionally, the nanoparticle-based label is selected from the group consisting of nanoparticles, colloids, organic nanoparticles, magnetic nanoparticles, quantum dot nanoparticles, and rare earth complex nanoparticles;
optionally, the colloid is selected from the group consisting of colloidal metals, disperse dyes, dye-labeled microspheres, and latex;
optionally, the colloidal metal is selected from the group consisting of colloidal gold, colloidal silver, and colloidal selenium;
optionally, the antibody or functional fragment thereof is coated to a solid phase;
alternatively, the solid phase is selected from the group consisting of microspheres, plates, and membranes;
alternatively, the solid phase is selected from the group consisting of magnetic microspheres, plastic microparticles, microplates, glass, capillaries, nylon and nitrocellulose membranes.
8. A reagent or kit for detecting amphetamine, comprising the antibody or functional fragment thereof according to any one of claims 1 to 6 or the antibody conjugate of claim 7.
9. A nucleic acid encoding the antibody or functional fragment thereof of any one of claims 1 to 6.
10. A vector comprising the nucleic acid of claim 10.
11. A cell comprising the nucleic acid of claim 10 or the vector of claim 11.
12. A method of preparing an antibody or functional fragment thereof according to any one of claims 1 to 6, comprising: culturing the cell of claim 12.
CN202210509728.1A 2022-05-11 2022-05-11 Anti-amphetamine antibodies, reagents and kits for detecting amphetamine Active CN117088983B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1340981A2 (en) * 2002-03-01 2003-09-03 Roche Diagnostics GmbH Antibodies for detecting amphetamine derivatives
WO2005093417A1 (en) * 2004-03-22 2005-10-06 Dade Behring Inc. Assays for amphetamine and methamphetamine using stereospecific reagents
CN117088982A (en) * 2022-05-11 2023-11-21 东莞市朋志生物科技有限公司 Anti-methamphetamine antibodies, reagents and kits for detecting methamphetamine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1340981A2 (en) * 2002-03-01 2003-09-03 Roche Diagnostics GmbH Antibodies for detecting amphetamine derivatives
WO2005093417A1 (en) * 2004-03-22 2005-10-06 Dade Behring Inc. Assays for amphetamine and methamphetamine using stereospecific reagents
CN117088982A (en) * 2022-05-11 2023-11-21 东莞市朋志生物科技有限公司 Anti-methamphetamine antibodies, reagents and kits for detecting methamphetamine

Non-Patent Citations (2)

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Title
SHRADDHA THAKKAR等: "Affinity improvement of a therapeutic antibody to methamphetamine and amphetamine through structure-based antibody engineering.", SCIENTIFIC REPORTS, vol. 4, pages 1 - 8 *
姜燕;吕昌龙;单风平;: "吗啡和甲基安非他明单克隆抗体联合胶体金检测试卡的研制", 中国免疫学杂志, no. 07 *

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