Affinity short peptide for targeted recognition of Annexin A2 and preparation method and use of affinity short peptide
An annexin and target recognition technology, which is applied in the preparation methods of peptides, chemical instruments and methods, peptide/protein components, etc., can solve problems such as hindering the improvement of curative effect, and achieve simple and large-scale production, good effect and high benefit. Effect
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Embodiment 1
[0035] Example 1 Recombination and purification of Annexin A2
[0036] 1.1 Transformation of the constructed Annexin A2 expression plasmid
[0037] Thaw the competent cells on ice. Add plasmid to competent cells, mix gently, and let stand on ice for 5 minutes. Heat shock at 42 degrees for 90 seconds. Quickly transfer to ice and cool for 3 min. Add non-resistant LB medium, 37 degrees. Dip the mixture with a glass rod and spread it evenly on the AMP plate medium. Place the plate in a 37 degree incubator overnight. The next day, check the growth of the colonies and store them in a 4-degree refrigerator.
[0038] 1.2 Massive amplification of Annexin A2
[0039] Shake the bacteria Annexin A2 overnight, add AMP and LB (1:1000) in the Erlenmeyer flask. 37 degrees, 200rpm shake overnight. The next day, store Annexin A2 overnight and freeze at -20°C. Add LB, bacterial solution and AMP into the Erlenmeyer flask, and shake the bacteria at 37 degrees and 180 rpm for 4 hours. Ad...
Embodiment 2
[0043] Example 2 Targeted screening of Annexin A2 protein specific binding positive polypeptide
[0044] 2.1 Recovery and cultivation of host bacteria E.coli ER2738
[0045] To prepare an E. coli plate, take the LB-TET culture plate and preheat it in a 37-degree incubator for 1 hour. After the E.coli ER2738 bacterial liquid melts, use an inoculation loop to dip a small amount of bacterial liquid evenly on the culture plate, and then place it upside down at 37°C overnight in a constant temperature incubator. Prepare the host bacterial solution, pick a single colony from a well-grown culture plate, place it in LB bacterial culture solution containing tetracycline, and cultivate overnight at 37°C with shaking at 180rpm, so that the bacteria are in the logarithmic growth phase. The prepared LB-Tet plate containing Escherichia coli was stored in a 4°C refrigerator for later use, and the host bacterial solution was stored in a -80°C refrigerator for later use.
[0046] 2.2 Targete...
Embodiment 3
[0076] Example 3 Solid phase synthesis and identification of positive polypeptide YW7 and FITC-YW7
[0077] According to the measured amino acid sequence, the homology comparison analysis of its amino acid sequence and the bioinformatics analysis of its nucleic acid sequence are carried out. Polypeptide YW7 (sequence YWRGVYN) and FITC-positive polypeptide fragment FITC-YW7 (sequence YWRGVYN) were synthesized by solid-phase synthesis, and the synthesized peptides were identified. At the same time, the above polypeptide YW7 and FITC-positive polypeptide fragment FITC-YW7 were synthesized at Sangon Bioengineering (Shanghai) Co., Ltd.
[0078] 3.1 Preparation of polypeptide YW7
[0079] 3.1.1 The strategy of Fmoc solid-phase synthesis of peptides was adopted, and Fmoc-Asn(pbf)-OH was used as raw material to bond with Wang resin. Then take off the Fmoc group, then carry out condensation reaction with Fmoc-Tyr(tBu)-OH in the presence of condensing agents DIC and HOBt, and complete...
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