Antibacterial activity and mechanism of X33 antimicrobial oligopeptide against Acinetobacter baumannii  

作　　者：Qunlin Lu Xiaoyu Wu Yuan Fang Yuanxiu Wang Bin Zhang 

机构地区：[1]College of Bioscience and Bioengineering,Jiangxi Agriculture University,Nanchang,330045,China [2]Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources,Nanchang,330045,China [3]Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables in Jiangxi Province,Nanchang,330045,China

出　　处：《Synthetic and Systems Biotechnology》2024年第2期312-321,共10页合成和系统生物技术（英文）

基　　金：This study was funded by Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province[No.20212BCJ23012];the Department of Science Technology of Jiangxi Province(Grant No.20171ACF60006);the Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables in Jiangxi Province,and National Natural Science Foundation of China[No.32000057 and 32360021]。

摘　　要：Acinetobacter baumannii is a pathogenic bacterium widespread in human environments,especially in intensive care units,and is associated with high morbidity and infection rates.Multiple drug resistance in A.baumannii frequently leads to the death of patients,making the development of multi-effect antibacterial agents against this bacterium a research hotspot.We have previously found that the X33 antimicrobial oligopeptide can effectively inhibit the growth of Penicillium digitatum and Candida albicans.Herein,we evaluated the antibacterial activity of X33 antimicrobial oligopeptide against A.baumannii by determining the minimum inhibitory concentration,inhibition zone,and growth curve.The increase in extracellular alkaline phosphatase and the leakage of intracellular compounds confirmed the effect of X33 antimicrobial oligopeptide on the cell wall and membrane.Changes in reactive oxygen species,malondialdehyde,ATP,reducing sugar,soluble protein,and pyruvate content demonstrated that the incubation with X33 antimicrobial oligopeptide affected energy metabolism and oxidative stress.Consistent with the physiological characteristics,transcriptomics analysis indicated that incubation with X33 antimicrobial oligopeptide significantly induced changes in the expression of 2339 genes,including 1262 upregulated and 1077 downregulated genes,which participate in oxidative phosphorylation,ribosome,quorum sensing,fatty acid degradation,glycolysis/gluconeogenesis,and citrate cycle pathways.These results provide a fundamental basis for investigating the mechanism of X33 antimicrobial oligopeptide as a potential drug against A.baumannii.

关 键 词：Acinetobacter baumannii Antimicrobial agents Antibiotic resistance Hospital-acquired infections 

分 类 号：R318[医药卫生—生物医学工程]