Bioassay

Construction and antibacterial activity evaluation of a new hybrid peptide DY-CA*

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  • School of medical technology, Beihua University, Jilin 132013, China

Received date: 2022-08-16

  Online published: 2024-06-26

Abstract

Objective: To construct a new hybrid peptide with high activity and low toxicity, to evaluate its anti Klebsiella pneumoniae activity, and explore its potential application value in the prevention and treatment of respiratory tract infection caused by Klebsiella pneumoniae. Methods: The physical and chemical properties of parental peptide dyskinbow-1ST were analyzed by bioinformatics software. Its active region was predicted and the construction strategy of cecropina was determined. Bioinformatics software was used to predict the physical and chemical properties of hybrid peptides and their antibacterial activity. The heterozygous peptide DY-CA was synthesized by solid-phase method. The minimum inhibitory concentration (MIC) of heterozygous peptide against Klebsiella pneumoniae was studied. The time growth curve of heterozygous peptide against Klebsiella pneumoniae was plotted. The hemolysis test of sheep blood red blood cells was performed. The antibacterial activity and biocompatibility of DY-CA were analyzed. The changes of biofilm were observed by crystal violet staining to study the inhibition and clearance efficiency of heterozygous peptides on Klebsiella pneumoniae biofilm. Results: The hybrid peptide DY-CA was predicted to be a stable hydrophobic antibacterial peptide with positive charge by online software, and the MIC of the hybrid peptide was 64 μg·mL-1. The inhibitory effect on Klebsiella pneumoniae was time and concentration dependent. The heterozygous peptides showed obvious inhibitory effect after 3 h. The A of 2 MIC and 1 MIC heterozygous peptides basically did not change and the growth of Klebsiella pneumoniae was completely inhibited. At the effective concentration, the hemolysis rate of sheep red blood cells was 4.23% (<5%), which was negative; 0.5 MIC (t0.5 MIC=11.10, P<0.05), 1 MIC (t1 MIC=17.96, P<0.05), 2 MIC (t2 MIC=14.18, P<0.05) DY-CA could inhibit the formation of Klebsiella pneumoniae biofilm; 0.5 MIC (t0.5 MIC=11.10, P<0.05) DY-CA had no obvious effect on the clearance of mature biofilm of Klebsiella pneumoniae. 1 MIC (t1 MIC=17.96, P<0.05), 2 MIC (t2 MIC=14.18, P<0.05) DY-CA could significantly destroy mature biofilm of Klebsiella pneumoniae. Conclusion: This experiment designed, constructed and screened a new hybrid peptide DY-CA with high activity and low toxicity. It has an efficient and rapid antibacterial effect on Klebsiella pneumoniae. It is expected to become a new drug for the prevention and treatment of respiratory diseases caused by Klebsiella pneumoniae.

Cite this article

SHAO Xue-chao, ZHAO Xiao-ying, WANG Dang, MA Jia-hui, ZHAO Yuan, SONG Shun-jia, JIA Hui-jian, SUN Li-yuan, ZHAO Yun-dong . Construction and antibacterial activity evaluation of a new hybrid peptide DY-CA*[J]. Chinese Journal of Pharmaceutical Analysis, 2022 , 42(12) : 2082 -2091 . DOI: 10.16155/j.0254-1793.2022.12.03

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