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HER2 protein targeting polypeptide and application thereof

A protein-targeted technology, applied in the field of biomedicine, can solve the problems of dyspnea, liver and kidney function decline, drug resistance in patients, etc., and achieve the effect of high throughput and high screening efficiency.

Active Publication Date: 2021-02-12
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the clinical and commercial success of currently used anti-cancer antibodies, there are still many problems with antibody drugs, for example, most patients will develop drug resistance, various factors may reduce drug efficacy, and the toxic effects of antibody drugs may cause lung cancer. Dyspnea from toxic reactions, occasional central and peripheral nervous system complications, and decline in liver and kidney functions are also huge obstacles in drug development

Method used

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  • HER2 protein targeting polypeptide and application thereof
  • HER2 protein targeting polypeptide and application thereof
  • HER2 protein targeting polypeptide and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1O

[0070] The establishment of embodiment 1 OBOC polypeptide library

[0071] In this embodiment, the OBOC method is used to synthesize a polypeptide library on resin beads (beads), and the steps are as follows:

[0072] (1) Take a certain amount of polypeptide synthetic resin and place it in a synthetic tube, add a certain amount of DMF to immerse the resin to swell the resin, and soak for more than 2 hours;

[0073] (2) Add Fmoc-protected methionine (M) to the synthesis tube, and react on a shaking table for more than 2 hours; alternately wash three times with methanol and DMF, and repeatedly blow up the resin with a straw during the washing process; then carry out ninhydrin Boiling water bath test, resin color is colorless;

[0074] (3) Add deprotection agent to carry out Fmoc deprotection for 10min, alternately rinse with methanol and DMF three times, and repeatedly blow up the resin with a straw during the rinse process; repeat deprotection once, that is, two consecutive de...

Embodiment 2

[0081] FITC labeling of embodiment 2 HER2 protein

[0082] In this example, the HER2 protein (SEQ ID NO: 12) is labeled with FITC, and the steps are as follows:

[0083] (1) Dissolve HER2 protein in PBS so that the final concentration of HER2 protein is 10-50 μg / mL;

[0084] (2) Add FITC to the HER2 protein solution prepared in step (1), so that the amount of FITC-labeled protein is 5%, place in an ice bath, and magnetically stir overnight under dark conditions;

[0085] (3) The next day, place the mixed solution in a dialysis bag with a molecular weight cut-off of 500, and dialyze for three days under deionized water conditions;

[0086] (4) The dialyzed solution is collected and freeze-dried by a freeze dryer to obtain FITC-labeled HER2 protein.

Embodiment 3

[0087] Example 3 Screening of polypeptides targeting HER2 protein

[0088] Incubate the FITC-labeled HER2 protein and the peptide library in PBS buffer for 2 hours, observe the color of the peptide resin excited by a wavelength of 405 nm under a fluorescence microscope, and select the observed peptide resin with obvious green fluorescence;

[0089] Use 30% CNBr for the selected peptide resin 3 The ethanol solution was lysed overnight, the supernatant was obtained by centrifugation, and the peptide sequencing was carried out after desalting treatment.

[0090] figure 1 Shown is the primary mass spectrogram of the polypeptide sequence, and the measured molecular weight of the polypeptide is close to the theoretical molecular weight, which is the desired polypeptide sequence.

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Abstract

The invention provides polypeptide targeting HER2 protein and an application of the polypeptide. The polypeptide comprises an amino acid sequence shown in SEQ ID NO: 1-11; or the polypeptide is an amino acid sequence with HER2 protein targeting activity, which is obtained by substituting and deleting a plurality of amino acids in the amino acid sequence shown in SEQ ID NO: 1-11 or adding the aminoacids at the N end and the C end. The polypeptide disclosed by the invention has the capability of combining HER2 protein, is small in relative molecular weight, strong in specificity and low in preparation cost, and has unique advantages and important application prospects in the aspects of targeted diagnosis and treatment of tumors.

Description

technical field [0001] The invention belongs to the technical field of biomedicine, and relates to a polypeptide targeting HER2 protein and its application. Background technique [0002] Twenty years ago, scientists summarized the six major characteristics of tumors, namely, uncontrolled growth, vascular proliferation, tissue invasion and metastasis, ability to escape death pathways, and unlimited proliferation; twenty years later, contemporary researchers still use these characteristics As a premise to explore the occurrence and development of tumors. With the advancement of science and technology and the deepening of research, researchers have discovered more tumor characteristics, including tumor microenvironment, tumor-specific metabolic pathways, inflammatory responses, etc., providing new ideas for research. Molecular targeted therapy occupies a place in the existing clinical tumor treatment plan. [0003] Molecular targeted therapy refers to the design of therapeuti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K7/06C07K1/06C07K1/04C40B30/04A61K47/64A61P35/00
CPCC07K7/06C40B30/04A61K47/64A61P35/00
Inventor 王浩王磊杨超杨培培
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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