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Cyclic peptide against multi-drug resistant bacteria and its preparation method and application

A technology for multidrug resistance and antimicrobial peptides, applied in the field of cyclic peptides, can solve the problems of identification of antimicrobial peptides, difficulty, etc.

Active Publication Date: 2020-10-27
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to identify effective antimicrobial peptides from a large number of peptide samples and predict their antibacterial activity experimentally

Method used

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  • Cyclic peptide against multi-drug resistant bacteria and its preparation method and application
  • Cyclic peptide against multi-drug resistant bacteria and its preparation method and application
  • Cyclic peptide against multi-drug resistant bacteria and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The synthesis of embodiment 1 antimicrobial peptide CPeptide-A:R-R-W-W-R (Arg-Arg-Trp-Trp-Arg)

[0042] Using the Fmoc solid-phase peptide synthesis method, using dichloro resin 2-CTC resin as a carrier, first synthesize a fully protected linear peptide, use a cleavage reagent to cleavage to obtain a fully protected linear peptide, and then cyclize in the liquid phase to obtain a fully protected cyclic peptide. After deprotection with trifluoroacetic acid, the primary product of cyclic peptide was obtained by ether precipitation.

[0043] The specific operation steps are:

[0044] (1) Resin activation

[0045] Weigh 1 g of resin and swell with 10 ml of DCM (dichloromethane) at room temperature for 30 min.

[0046] (2) The first amino acid is coupled to the resin

[0047] Weigh the protected amino acid Fmoc-Arg(Pbf)-OH with a total resin substitution value of 3eq and add it to the DCM solution, then add DIEA (N,N-diisopropylethylamine) with a total resin substitution ...

Embodiment 2

[0066] Example 2 Antimicrobial peptide CPeptide-B: R-R-W-W-R-F (Arg-Arg-Trp-Trp-Arg-Phe) Synthesis Reference Example 1, wherein the (4) step amino acid coupling is (Fmoc-Trp(Pbf)-OH, Fmoc-Trp(Pbf)-OH, Fmoc-Arg(Pbf)-OH, Fmoc-Phe(Pbf)-OH).

[0067] The prepared antimicrobial peptide CPeptide-B was analyzed by mass spectrometry, and the molecular weights shown in the mass spectrum were 987.90, and the theoretical value calculated from the peptide sequence was 988.167, which proved that the prepared peptide was the designed CPeptide-B.

Embodiment 3

[0068] Embodiment 3 antimicrobial peptide CPeptide-C:R-W-W-R-F (Arg-Trp-Trp-Arg-Phe) synthesis

[0069] With reference to Example 1, wherein (3) step coupling amino acid is Fmoc-Trp(Pbf)-OH, (4) coupling amino acid is successively (Fmoc-Trp(Pbf)-OH, Fmoc-Arg(Pbf)-OH, OH, Fmoc-Phe(Pbf)-OH).

[0070] The prepared antimicrobial peptide CPeptide-C was analyzed by mass spectrometry, and the molecular weights shown in the mass spectrometry were 831.80, and the theoretical value calculated from the polypeptide sequence was 831.979. It is proved that the prepared polypeptide is the designed CPeptide-C antimicrobial peptide.

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Abstract

The invention discloses a cyclic peptide resistant to multi-drug resistant bacteria. The cyclic peptide resistant to the multi-drug resistant bacteria is characterized in that the amino acid sequenceis any of CPeptide-A, CPeptide-B, CPeptide-C and CPeptide-D, and the antibacterial cyclic peptide is obtained through cyclization of amido bonds formed by amino groups and carboxy groups of head and tail amino acids of any of the amino acid sequence. The four novel artificially designed cationic antibacterial peptides can be synthesized by adopting an Fmoc solid-phase chemical method, the operability is strong, and the cost is low. The cationic antibacterial peptides have broad spectrum killing activity against multidrug-resistant acinetobacter baumannii, have stronger bactericidal activity than natural antimicrobial peptides, and have no toxic effect on animal and plant cells.

Description

technical field [0001] The invention relates to an anti-multidrug-resistant bacterial cyclic peptide, a preparation method and application thereof, and relates to the field of cyclic peptides. Background technique [0002] Antibiotics have been used for more than 70 years, but due to the abuse of antibiotics, many bacteria have developed resistance to antibiotics, such as vancomycin-resistant enteric bacteria, methicillin-resistant Staphylococcus aureus, ampicillin-resistant large intestine, etc. bacilli etc. The emergence of various drug-resistant bacteria and even the emergence of superbugs have made bacterial infectious diseases an urgent problem to be solved. Due to the repeated emergence of multi-drug resistant bacteria, pathogens are resistant to traditional antibiotics, and the research and development of new antibiotics The discovery process is relatively slow. Therefore, it is very necessary to develop new, efficient and safe antibacterial drugs. [0003] Antimic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K7/64C07K1/06C07K1/04C07K1/02A61K38/12A61P31/04
CPCA61K38/00A61P31/04C07K7/64
Inventor 王远强王昱璇杨胜喜覃仁辉林治华郭海琼何清秀
Owner CHONGQING UNIV OF TECH
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