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7 peptide for blocking CTLA4 in immunotherapy

An immunotherapy, L-type technology, applied in the field of biomedicine, can solve problems such as limited technical effect

Inactive Publication Date: 2021-04-13
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most polypeptide drugs are small molecular substances, they are easily degraded in the body, and the half-life is usually a few seconds or a few minutes. This defect leads to relatively limited practical technical effects.

Method used

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  • 7 peptide for blocking CTLA4 in immunotherapy
  • 7 peptide for blocking CTLA4 in immunotherapy
  • 7 peptide for blocking CTLA4 in immunotherapy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] It should be noted that the polypeptide claimed in this application is obtained by screening with relevant software and databases, so this embodiment first briefly describes the background of relevant software and databases as follows.

[0024] Screening software: MOE software (Molecular Operating Environment), purchased from Shanghai Daku Data Center, version number: MOE 2016.0802.

[0025] Virtual 7-peptide library construction: In the MOE software, under the Protein Builder module, select the D-type amino acid of ACDEFGH (mainly to avoid repetitions) to construct a 3D structure; then under the Protein design module, select Residue Scan, and set the Display option to All Residues , select 20 kinds of D-type amino acids for each site, set the Site Limit to 7, perform simultaneous mutation at multiple sites, and check the Properties option at the same time to calculate the stability of each polypeptide; finally, after the peptide library is generated, remove the repeated...

Embodiment 2

[0031] Based on the 7-peptide library and homo CTLA4 amino acid sequence in Example 1, and using the principle of protein-protein docking technology, the inventors conducted further screening. The specific process is as follows:

[0032] First, use the Quickprep Panel module in the MOE software to complete the structural preparation of the optimized CTLA4 structure in Example 1 (the process and results are as follows figure 2 B and 2C);

[0033] Subsequently, according to the binding pocket of CTLA4 as the binding site of the D-type polypeptide, the inhibitor of the D-type 7 peptide was screened;

[0034] Finally, for docking, set Pre-Placement: 1000, Placement: 100, Refinement: 1 in pose.

[0035] When screening, use the CTLA4 binding site as the Docking site, screen the D-type peptides of CTLA4 through the Protein-Protein docking mode, sort the screening results according to the S value (energy value), and select the top 10 D peptides (Top10 ) result as a candidate sequen...

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Abstract

The invention belongs to the technical field of biological medicines, and particularly relates to a 7 peptide for blocking CTLA4 in immunotherapy. The polypeptide is named as I1T7 peptide, and is of a 7 peptide structure, and the amino acid sequence is shown as SEQ ID No. 1, specifically INWYKFT. According to the 7 peptide, a D-type 7 peptide library is constructed by utilizing MOE software, and virtual screening is carried out on CTLA4 (PDB:1I85) of a human in an immunodetection point; in the screening process, a protein-protein docking technology principle is utilized, a binding pocket of CTLA4 is used as a site of polypeptide docking, and a D-type 7 peptide structure with the highest binding energy is preliminarily screened and determined; and the peptide is named as I1T7, the energy value of the peptide is -53.2832, and the peptide has the capability of blocking the combination of CTLA4 and B7-2 (namely CD86) (affinity or blocking property), and has a potential anti-tumor application effect.

Description

technical field [0001] The application belongs to the technical field of biomedicine, and specifically relates to a 7-peptide used to block CTLA4 in immunotherapy. Background technique [0002] Immune checkpoints refer to a series of molecules that are expressed on immune cells and regulate the degree of immune activation. They play an important role in preventing the occurrence of autoimmunity (abnormal immune function, attacking normal cells), especially It plays a very important role in tumor immunotherapy. On the other hand, the immune function of the human body will be activated when stimulated, but usually not overactivated. The main reason is that one of the important functions of "immune checkpoint molecules" is similar to the brake system of a car. When the immune system is activated Can "brake" in time to keep the activation of the immune system within the normal range. [0003] The abnormal expression and function of immune checkpoint molecules is one of the imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K7/06A61K38/08A61P35/00
CPCC07K7/06A61P35/00A61K38/00
Inventor 闫中义郭向前韩亚莉张璐谢龙祥李会敏
Owner HENAN UNIVERSITY