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Multimeric antimicrobial peptide complex which is displayed on cell surface

a multi-meric, antimicrobial technology, applied in the direction of peptides, dna/rna fragmentation, drug compositions, etc., can solve the problem that conventional methods for producing antimicrobial peptides cannot provide large amounts of antimicrobial peptides in a cost-effective manner, and the number of usable antibiotics has been limited. problems, to achieve the effect of reducing cost, high antimicrobial activity, and widespread us

Inactive Publication Date: 2013-12-26
KOREA ADVANCED INST OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a method for producing an antimicrobial peptide that can be used without needing to lyse cells and purify it. This reduces the cost and allows for wider use. The antimicrobial peptide is also produced in a way that can be easily digested in the body, resulting in high antimicrobial activity. This makes it effective for treating infectious diseases caused by bacteria, yeast, or fungi, and can be used as a substitute for conventional antibiotics.

Problems solved by technology

However, the misuse of antibiotics has resulted in a rapid increase in antibiotic-resistant strains, and thus the number of usable antibiotics has been limited.
For industrial application of these antimicrobial peptides, methods capable of producing large amounts of the antimicrobial peptides in a cost-effective manner are by necessity required, but conventional methods for producing the antimicrobial peptides cannot provide large amounts of the antimicrobial peptides in a cost-effective manner.
In other words, the use of a chemical synthesis method, which is a conventional method for peptide production has low economic efficiency, and when an antimicrobial peptide is produced from microorganisms using genetic engineering technology there are problems in that the antimicrobial peptide is expressed at a low level and shows antimicrobial activity against the host and in that the expressed antimicrobial peptide is easily degraded by proteinases in the host.
However, the above method has a critical problem in that a large amount of the antimicrobial peptide is lost during the recovery process so that the yield thereof is significantly reduced, resulting in a significant increase in the price of the antimicrobial peptide.
As a result, the cell lysis process could be omitted by displaying the antimicrobial peptide on the cell surface, but there were still problems in that the cell surface display protein must be treated with a separate enzyme in order to isolate the antimicrobial peptide and in that a chromatography or ion-exchange column must be used to remove impurities.
However, this method has a serious problem in that the antimicrobial activity of the antimicrobial peptide attached to the cell surface is significantly reduced.

Method used

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  • Multimeric antimicrobial peptide complex which is displayed on cell surface
  • Multimeric antimicrobial peptide complex which is displayed on cell surface
  • Multimeric antimicrobial peptide complex which is displayed on cell surface

Examples

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Effect test

example 1

Determination of Sequence of Amino Acid Linker that is Digested by Pepsin and Measurement of Antimicrobial Activity of Monomeric Antimicrobial Peptide Comprising the Amino Acid Linker

1-1: Determination of Sequence of Amino Acid Linker that is Digested by Pepsin

[0080]In order to prepare an antimicrobial peptide polymer which is separated into monomeric units by pepsin, antimicrobial peptide units (SEQ ID NO. 9: RVVRQWPIGRVVRRVVRRVVR) of SEQ ID NO: 1 disclosed in Korean Patent Registration No. 0441402 were linked to each other using any amino acid as a linker, thereby obtaining an antimicrobial peptide polymer. Then, the sequence of the amino acid linker that is digested by pepsin to separate the peptide polymer into monomeric forms was determined using the computer program tool ExPAsy (Expert protein analysis system, Swiss). As a result, a peptide linkage formed between the C-terminus of each of leucine, phenylalanine and tyrosine and the N-terminus of the antimicrobial peptide was d...

example 2

Preparation of Antimicrobial Peptide Polymer which is Digested by Pepsin

[0084]A DNA fragment was constructed, which encodes the monomeric antimicrobial peptide (Hinge2L) comprising the amino acid linker (leucine) that is digested by pepsin added to the C-terminus of the antimicrobial peptide as described in Example 1. The DNA vector was cloned into a vector. Specifically, PCR was performed using primers of SEQ ID NO: 1 (5′-GAAGACCCCGTGTTGTTCG TCAGTGGCCGATTGGTCGTGTCGTTCGCCGTGTTGTTCG-3′) and SEQ ID NO: 2 (5′-GGATGGATCCTAAGCACGCAGACGAACGACGCGACGAACAACACGGCGAACGACACG-3′), thereby obtaining a double-stranded DNA fragment encoding a monomeric antimicrobial peptide (consisting of 22 amino acids) comprising the amino acid linker that is digested by pepsin leucine added to the C-terminus of the antimicrobial peptide of SEQ ID NO: 9. The PCR reaction was performed for 30 cycles, each consisting of DNA denaturation at 94° C. for 30 sec, annealing at 56° C. for 30 sec and DNA synthesis at 72° C...

example 3

Construction and Cloning of DNA Fragment of Antimicrobial Peptide Polymer Linked to Cell Surface Anchoring Motif

3-1: Construction and Cloning of Antimicrobial Peptide Polymer DNA Linked to Lpp-OmpA

[0087]In order for the antimicrobial peptide polymer to be displayed on the host cell surface, a Lpp-OmpA DNA fragment serving as a cell surface anchoring motif was constructed, which has the nucleotide sequence of SEQ ID NO: 7 comprising a portion of an E. coli outer membrane protein A (OmpA) attached to the leader sequence of E. coli lipoprotein and to the cell outer membrane. The Lpp-OmpA DNA fragment was cloned into a vector.

[0088]Specifically, in order to construct the Lpp-OmpA DNA fragment, primers of SEQ ID NO: 3 (5′-CGCCATATGAAAGCTACTAAACTGG TACTGGGCAACAACAATGGCCCGACC-3′), SEQ ID NO: 4 (5′-GCAAACACCGGAGAAAC GCCGGTG-3′), SEQ ID NO: 5 (5′-TTCTCCGGTGTTTGCTGGCGGTGTTG-3′) and SEQ ID NO: 6 (5′-CGGGATCCTAGTGATGGTGATGGTGATGAACACGCAGTCT TCCACGGGTAG-3′) were synthesized, recombinant PCR was ...

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Abstract

The present invention provides an antimicrobial peptide polymer comprising at least one monomer which is digested by pepsin, a multimeric antimicrobial peptide complex comprising the polymer and a cell surface anchoring motif linked to the polymer, an antimicrobial microorganism displaying the multimeric antimicrobial peptide complex, an antimicrobial composition comprising the same, a method of treating an infectious disease caused by bacteria, yeast or fungi by administering the antimicrobial composition, and a method for producing the antimicrobial microorganism. According to the invention, living microorganisms displaying an antimicrobial peptide on the cell surface thereof may be administered in vivo without having to lyse the microbial cell and isolate and purify the antimicrobial peptide, so that the antimicrobial peptide exhibits antimicrobial activity. Thus, the antimicrobial peptide may be produced at significantly reduced costs so that it may have widespread use.

Description

TECHNICAL FIELD[0001]The present invention relates to an antimicrobial peptide polymer comprising at least one monomer which is digested by pepsin, a multimeric antimicrobial peptide complex comprising the polymer and a cell surface anchoring motif linked to the polymer, an antimicrobial microorganism displaying the multimeric antimicrobial peptide complex, an antimicrobial composition comprising the same, a method of treating an infectious disease caused by bacteria, yeast or fungi by administering the antimicrobial composition, and a method for producing the antimicrobial microorganism.BACKGROUND ART[0002]To protect humans from pathogenic microorganisms, many antibiotics have been discovered, developed and used. However, the misuse of antibiotics has resulted in a rapid increase in antibiotic-resistant strains, and thus the number of usable antibiotics has been limited. For this reason, there has been a demand for novel substances which have activation mechanisms different from co...

Claims

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Application Information

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IPC IPC(8): A61K47/48C07K14/245C07K14/00
CPCA61K47/48338C07K14/00C07K14/245A61K38/16A61K47/65A61P31/04A61K47/6901C07K14/21C07K14/255C07K14/4723C07K2319/035C07K2319/50C12N15/62C12P21/02C12P21/06
Inventor KIM, SUN-CHANGSHIN, JU RILIM, KI JUNGKIM, DA JUNGLEE, YOUNG WOONGJANG, SU ASUNG, BONG HYUN
Owner KOREA ADVANCED INST OF SCI & TECH
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