A kind of efficient hybrid antimicrobial peptide li and its preparation method and application
A technology of antimicrobial peptides and human antimicrobial peptides, applied in the preparation method of peptides, cationic antimicrobial peptides, hybrid peptides, etc., can solve the problems of complex structure, small molecular weight of antimicrobial peptides, and low activity of antimicrobial peptides
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Embodiment 1
[0016] The amino acid sequence of human antimicrobial peptide LL37 is:
[0017]
[0018] The amino acid sequence of bovine antimicrobial peptide In13 is:
[0019] Ile Leu Pro Trp Lys Trp Pro Trp Trp Pro Trp Arg Arg-NH2
[0020] 1 5 10 13
[0021] According to the site-specific amino acid fragment interception method, the amino acid residues 14-21 of human antimicrobial peptide LL37 (GlyLysGluPheLysArgIleVal) and the fragments of amino acid residues 5-13 of bovine antimicrobial peptide In13 (LysTrpProTrpTrpProTrpArgArg) were intercepted.
[0022] The above two fragments were sequentially connected to obtain LI (GlyLysGluPheLysArgIleValLysTrpProTrpTrpProTrpArgArg-NH 2 ) antimicrobial peptides.
Embodiment 2
[0024] The above two antimicrobial peptides were synthesized using a peptide synthesizer. The method was solid-phase chemical synthesis, and the specific steps were:
[0025] 1) The preparation of antimicrobial peptides is carried out one by one from the C-terminus to the N-terminus, and is completed by a peptide 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;
[0026] Add cutting reagent to the peptide resin obtained above, react at 20°C for 2 hours in the dark, filter; precipitate TFA (trifluoroacetic acid) for washing, mix the washing...
Embodiment 3
[0032] The designed and synthesized antimicrobial peptides were compared and detected by in vitro antibacterial and hemolytic activity tests;
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