Palmitic anti-enzymolysis antibacterial peptide, and preparation method and application thereof

A technology of palmitic acidification and antimicrobial peptides, applied in the biological field, can solve the problems of loss of activity and limited therapeutic efficacy of natural antimicrobial peptides, and achieve the effect of low hemolytic toxicity

Active Publication Date: 2020-07-17
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, more than 3,000 natural antimicrobial peptides have been extracted from animals, plants and microorganisms, but the natural antimicrobial peptides only show limited therapeutic efficacy
and are prone to loss of activity under physiological conditions after systemic administration

Method used

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  • Palmitic anti-enzymolysis antibacterial peptide, and preparation method and application thereof
  • Palmitic anti-enzymolysis antibacterial peptide, and preparation method and application thereof
  • Palmitic anti-enzymolysis antibacterial peptide, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Antimicrobial Peptide Design:

[0019] palmitoylated anti-enzyme antimicrobial peptide B 3 C 16 The sequence is:

[0020] C 16 -GGGK(PRPR)K(PRPR)RPRP

[0021] The hydrolysis of trypsin is avoided by means of steric hindrance, that is, the protective amino acid proline (Pro) is placed on the carboxyl terminal of each positively charged amino acid arginine (Arg) to form steric hindrance between amino acids, and at the same time Use lysine (Lys) to add two branched peptide chains on the polypeptide main chain, such as Figure 4 As shown, the dendritic structure and the steric hindrance between the peptide chains are formed, palmitic acid is further used as the main source of hydrophobicity of the antimicrobial peptide sequence, which perfectly avoids the hydrolysis of hydrophobic amino acids by all proteases, and finally the flexible amino acid linker is used GGG linked palmitic acid with branched peptides to form a perfect amphiphilic structure, and named the newly d...

Embodiment 2

[0028] The above-mentioned antimicrobial peptides were synthesized using a peptide synthesizer. The method was solid-phase chemical synthesis, and the specific steps were:

[0029] 1. The preparation of the polypeptide main chain is carried out one by one from the C-terminal to the N-terminal, and is completed by a polypeptide synthesizer. First, Fmoc-X (X is the first amino acid at the C-terminal of each antimicrobial peptide) is inserted into Wang resin, and then the Fmoc group is removed to obtain X-Wang resin; then Fmoc-Y-Trt-OH (9 -Fmoxy-trimethyl-Y, Y is the second amino acid at the C-terminus of each antimicrobial peptide); according to this procedure, it is synthesized from the C-terminus to the N-terminus until the synthesis is completed, and the side of the Fmoc group is removed chain protection resin;

[0030] 2. Use hydrazine hydrate to remove the Fmoc-Lys(Dde)-OH side chain Dde protecting group, and repeat step 1 to complete the branched-chain amino acid linkage....

Embodiment 3

[0035] Detect the antibacterial activity, hemolytic activity and protease hydrolysis ability of the designed and synthesized antimicrobial peptide in vitro;

[0036] 1. Determination of antibacterial activity: The minimum inhibitory concentration of several antibacterial peptides was determined by the micro broth dilution method. Bacterial single colonies were picked and cultured overnight in MHB medium, and transferred to new MHB to grow to mid-logarithmic phase. The above bacterial solution was then centrifuged and resuspended in MHB to a final concentration of 1 × 10 5 CFUml -1, and transferred to a 96-well plate, 50 μl per well. 50 μl of BSA containing different concentrations of peptides were added to the above-mentioned 96-well plate, and the final peptide concentration in the 96-well plate ranged from 0.125 to 64 μM. After incubating at 37° C. for 22-24 hours, measure the light absorption value at 492 nm (OD=492 nm) with a microplate reader to determine the minimum i...

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Abstract

The invention provides a palmitic anti-enzymolysis antibacterial peptide, and a preparation method and application thereof. The sequence of the antibacterial peptide B3C16 is C16-GGGK(PRPR)K(PRPR)RPRP, wherein C16 is palmitic acid. The side chain of each lysine is linked with a polypeptide branched chain PRPR through an amide bond to form steric hindrance between a dendritic structure and a peptide chain; further, palmitic acid is used as a main hydrophobic source of the antibacterial peptide sequence, so that hydrolysis of hydrophobic amino acids by all proteases is perfectly avoided; and finally a flexible amino acid connector GGG is used for linking the palmitic acid with a branched peptide to form a perfect amphiphilic structure. The antibacterial peptide has high-efficiency inhibitioneffect on standard bacteria and drug-resistant bacteria such as Gram-negative bacteria, Gram-positive bacteria and the like, and has very low hemolytic toxicity, and the hydrolysis degree of high-concentration protease to the B3C16 is low.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to a palmitated anti-enzymolysis antimicrobial peptide and a preparation method and application thereof. Background technique [0002] Most of the antibiotics currently used were extracted from natural microorganisms in the 1940s to 1960s, and there is a lack of effective updates to antibiotics in recent decades. In recent years, bacteria have gradually increased their resistance to existing antibiotics through changes in target sites, increased efflux or decreased influx, drug inactivation, and increased survival tolerance. Infections caused by drug-resistant bacteria are increasing globally and are expected to kill 10 million people annually by 2050. Therefore, new anti-infective drugs that are insensitive to existing resistance mechanisms are urgently needed to combat the increasing number of drug-resistant bacterial infections. Antimicrobial peptides (Antimicrobial pep...

Claims

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Application Information

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IPC IPC(8): C07K7/08C07K1/06C07K1/04A61K38/10A61P31/04
CPCC07K7/08A61P31/04A61K38/00
Inventor 单安山来振衡邵长轩
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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