Small peptide against clinical multi-drug resistant bacteria
A technology for multidrug-resistant bacteria and drugs, which is applied in the direction of antibacterial drugs, antifungal agents, peptides, etc., can solve the problems of less toxicity research, low antibacterial activity, and unclear mechanism of action, and achieve environmental friendliness. Stable and specific effect
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Embodiment 1
[0038] Solid Phase Synthesis of Small Peptides Against Clinical Multidrug Resistant Bacteria
[0039] The amino acid sequence of each small peptide is as follows:
[0040] T1.
[0041] Gly-Ser-Lys-Lys-Pro-Val-Pro-Ile-Ile-Tyr-Cys-Gln-Arg-Arg-Thr-Gly-Lys-Cys-Gln-Arg-Met( 12 Asn→ 12 Gln); (GSKKPVPIIYCQRRTGKCQRM) see Seq NO: 1;
[0042] T2.
[0043] Gly-Ser-Lys-Lys-Pro-Val-Pro-Ile-Ile-Tyr-Cys-Asn-Arg-Arg-Ala-Gly-Lys-Cys-Gln-Arg-Met( 15 Thr → 15 Ala); (GSKKPVPIIYCNRRAGKCQRM) see Seq NO: 2;
[0044] T3.
[0045] Gly-Ser-Lys-Lys-Pro-Val-Pro-Ile-Ile-Tyr-Cys-Asn-Arg-Arg-Thr-Ala-Lys-Cys-Gln-Arg-Met( 16 Gly → 16 Ala); (GSKKPVPIIYCNRRTAKCQRM) see Seq NO: 3;
[0046] T4.
[0047] Gly-Ser-Lys-Lys-Pro-Val-Pro-Ile-Ile-Tyr-Cys-Gln-Arg-Arg-Ser-Gly-Lys-Cys-Gln-Arg-Met( 12 Asn→ 12 Gln, 15 Thr → 15 Ser); (GSKKPVPIIYCQRRSGKCQRM) see Seq NO: 4;
[0048] T5.
[0049] Gly-Ser-Lys-Lys-Pro-Val-Pro-Ile-Ile-Tyr-Cys-Gln-Arg-Arg-Thr-Ala-Lys-Cys-Gln-Arg-Met( 12 Asn→ 12 Gln, 16 Gly → 16 A...
Embodiment 2
[0067] Determination of antibacterial activity against clinical drug-resistant bacteria
[0068] 2.1 Source of strain
[0069]All clinical drug-resistant bacteria used in this experiment were isolated from the Bacteria Laboratory of Zhongda Hospital Affiliated to Southeast University. Among them, 4 strains of Escherichia coli, 4 strains of Klebsiella pneumoniae, 4 strains of Enterobacter cloacae, 6 strains of Enterobacter aerogenes, and Klebsiella ornithine 4 strains of Klebsiella ornithinolytica, 3 strains of Pseudomonas aeruginosa, 4 strains of Klebsiella oxytoca, 5 strains of Enterococcus faecium, 3 strains of Candida albicans strain. 所用标准菌株Escherichia coli ATCC 25922,Klebsiella pneumoniae ATCC 700603,Enterobacter cloacae ATCC13047,Enterobacteraerogenes ATCC 49701,Klebsiella ornithinolytica ATCC31898,Klebsiella oxytocaATCC 43086,Enterococcus faecium ATCC 29212,Pseudomonas aeruginosa ATCC 15442,Canidia Albicans ATCC10231由卫生部临检中心提供。
[0070] 2.2 Antibiotic susceptibility te...
Embodiment 3
[0092] Effects of Small Peptide Alone or Combined with Polymyxin on Mice with Pseudomonas Aeruginosa Septicemia
[0093] Establishment of mouse sepsis model: Pseudomonas aeruginosa standard strain (Pseudomonas aeruginosa) ATCC15442 and clinically isolated multidrug-resistant bacteria were cultured in MH medium to the logarithmic growth phase, centrifuged at 1000×g for 15min, discarded the supernatant, and used sterile Resuspended in normal saline to a concentration of 1×10 8 CFU / mL. The mice were anesthetized by intramuscular injection of ketamine 30mg / kg, and intraperitoneal injection of 0.2mL with a concentration of 2.0×10 8 CFU bacteria solution, observed for 72h. The grouping and administration were as follows (10 rats in each group): the control group, normal saline; the first group, 2mg / kg polymyxin; the second group, 2mg / kg master, and the third to fifth groups were respectively 2mg / kg T9, T10, T11; the sixth to eighth groups: 2mg / kg polymyxin and 2mg / kg small peptid...
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