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Antigen mimic epitope of ochratoxin A and application thereof

A technology of ochratoxin and mimetic epitopes, which is applied in the biological field, can solve the problems of restricting the application and promotion of immunological detection methods, high price, carcinogenicity, health of testing personnel and environmental threats, etc., to achieve cost saving, good effect and high efficiency. The effect of applying value

Inactive Publication Date: 2013-06-12
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of establishing an immunological detection method, OTA standards must be used as raw materials to prepare competing antigens or solid-phase coated antigens. OTA is not only expensive but also highly carcinogenic, causing harm to the health of testing personnel and the environment. It is a great threat, which restricts the application and promotion of immunological detection methods to a certain extent.

Method used

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  • Antigen mimic epitope of ochratoxin A and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. Affinity panning and identification of OTA antigen mimotope

[0018] 1) Affinity panning of OTA antigen mimic epitopes: the specific method is: dilute anti-OTA monoclonal antibody with 10 mM PBS (pH 7.4), and coat a 96-well microtiter plate with a final concentration of 100 μg / mL, at 4°C Incubate overnight. The next day, after washing 10 times with TBST (50 mM NaCl, pH 7.5 containing 0.1% Tween-20 (v / v) ), add 300 μl of blocking solution (3% BSA-PBS) and incubate at 4°C for 2 hours. After 2 hours, the blocking solution was discarded, washed 5 times with TBST, and 100 μl of phage peptide library (phage display dodecapeptide library, purchased from NEB Company) was added to each well, and the phage stock solution was diluted 10 times with TBS, about 1.0×10 11 pfu), shake and react for 1 hour at 22-26°C. Unbound phages were discarded, washed 10 times with TBST, bound phages were eluted with 0.2 M Glycine-HCl (pH 2.2), and immediately neutralized with 15 μl 1 ...

Embodiment 2

[0022] Example 2. Sequencing of the gene encoding the mimotope of the OTA antigen and determination of its amino acid sequence

[0023]The phages identified by indirect competition ELISA displaying OTA antigen mimic epitopes were amplified, and the DNA sequencing templates of the phages were extracted. The brief process is as follows: carry out phage amplification, after the first step of centrifugation, transfer 800 μl of phage-containing supernatant into a new centrifuge tube. Add 200 μl PEG / NaCl to precipitate the phage. After centrifugation, resuspend the pellet in 100 μl iodide buffer (10 mM Tris-HCl (pH 8.0), 1 mM EDTA, 4 M NaI), add 250 μl absolute ethanol to precipitate DNA, centrifuge and wash with 70% ethanol Precipitation (DNA sequencing template). The pellet was finally resuspended in 20 μl of sterilized water, and 2 μl was taken for agarose gel electrophoresis analysis; 5 μl of phage template was used for DNA sequencing, and its -96 gIII sequencing primer was: 5...

Embodiment 3

[0024] Example 3. Application of OTA antigen mimotope as a competitive antigen in ELISA

[0025] (1) Sample extraction

[0026] Weigh 5g of the sample (cereals and related foods), add 25ml of 60% methanol-PBS solution, shake at 200 rpm for 5 minutes; filter the extract with No. 1 filter paper, take 1ml of the filtrate and add 4ml of PBS ( Phosphate buffer, pH = 7.2) After mixing, it is the sample extract, ready for use.

[0027] (2) Coating and sealing

[0028] Dilute the anti-OTA monoclonal antibody with 10 mM PBS (pH 7.4), coat the microtiter plate with 10 μg / mL, and incubate overnight at 4°C. The next day, after washing 3 times with PBST (10 mM PBS, 0.05% Tween-20 (v / v)), block with PBS containing 3% skimmed milk powder, incubate at 37°C for 1 hour, then wash the plate 6 times with PBST stand-by.

[0029] (3) Establishment of standard curve

[0030] Take out the strips treated in step (2), and put 50 μl of phage displaying OTA antigen mimic epitopes into each well (1....

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Abstract

The invention belongs to the technical field of biology, and relates to an antigen mimic epitope of ochratoxin A. The amino acid sequence of the antigen mimic epitope is as follows: KLGFQLHQPSWP, FNLHQPIHNWPL, AQFFQLHSQAYS or DGFQLHTPFSAK. The OTA (Ochratoxin A) antigen mimic epitope provided by the invention can replace an OTA standard product which is high in price and strong in toxicity and is applied to immunological detection on the OTA as a competitive antigen or a solid-phase envelope antigen; sf the antigen mimic epitope has immunoreaction characteristics similar to that of natural OTA molecules, and is very good in effect. The damage of the OTA to the human body health is reduced, the cost is saved, and high application values are provided.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to an ochratoxin A antigen mimic epitope and application thereof. Background technique [0002] Ochratoxin A (OTA) is a common mycotoxin and a secondary metabolite produced by certain species of Aspergillus and Penicillium. Studies have shown that OTA is easy to accumulate in tissues, and its main target organs are the kidney and liver. It is a potent kidney and liver toxin. Experiments have shown that acute or chronic poisoning will occur after animals ingest feed contaminated by this toxin. In addition, according to literature reports, OTA is also carcinogenic, teratogenic and mutagenic. OTA toxin-producing strains widely exist in nature, and OTA contamination can be detected in various crops, food, feed, human and animal tissues and blood. Timely detection of OTA pollution is an effective means to prevent and control its harm. [0003] At present, the methods for detec...

Claims

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Application Information

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IPC IPC(8): C07K7/08C12N15/31C12P21/02C12N15/70G01N33/68C12R1/92
Inventor 何庆华许杨贺贞云
Owner NANCHANG UNIV
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