Properties and antibacterial activity of novel self-assembled antibacterial peptide CR-16
Objective To study the properties and antimicrobial activity of the novel self-assembled antimicrobial peptide(AMP)CR-16,and to provide experimental evidence for the treatment of bacterial infections.Methods CR-16 was designed and synthesized based on the structure of antimicrobial peptides Buforin Ⅱ and LfcinB.Dynamic light scattering(DLS),transmission electron microscopy(TEM),and X-ray diffraction(XRD)were used to characterize CR-16.Based on the results of critical micelle concentration(CMC),the self-assembled properties of CR-16 were investigated using atomic force microscopy(AFM)and circular dichroism(CD).The minimum inhibitory concentration(MIC)was used to study the inhibitory effect of CR-16 while transmission electron microscopy(TEM)was adopted to observe the interactions between CR-16 and the outer membrane of bacteria.Results AMP CR-16 was prepared as self-assemblies,which were regularly spherical in shape and stable in activity.CR-16 could inhibit both the growth of Escherichia coli and,more importantly,the growth of NDM-1-producing carbapenem-resistant Escherichia coli,promising good prospects in treating infections caused by antibiotic-resistant bacteria.Conclusion CR-16 can be self-assembled and deliver antibacterial effects against Escherichia coli.
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