文献类型：期刊文献

英文题名：The VirAB-VirSR-AnrAB Multicomponent System Is Involved in Resistance of Listeria monocytogenes EGD-e to Cephalosporins, Bacitracin, Nisin, Benzalkonium Chloride, and Ethidium Bromide

作者：Jiang, Xiaobing[1];Geng, Yimin[1];Ren, Siyu[1];Yu, Tao[2];Li, Yi[1];Liu, Guosheng[1];Wang, Hailei[1];Meng, Hecheng[3];Shi, Lei[4]

第一作者：Jiang, Xiaobing

通讯作者：Wang, HL[1]

机构：[1]Henan Normal Univ, Coll Life Sci, Xinxiang, Henan, Peoples R China;[2]Xinxiang Univ, Coll Life Sci & Technol, Xinxiang, Henan, Peoples R China;[3]South China Univ Technol, Coll Light Ind & Food Sci, Guangzhou, Guangdong, Peoples R China;[4]Jinan Univ, Inst Food Safety & Nutr, Guangzhou, Guangdong, Peoples R China

第一机构：Henan Normal Univ, Coll Life Sci, Xinxiang, Henan, Peoples R China

通讯机构：[1]corresponding author), Henan Normal Univ, Coll Life Sci, Xinxiang, Henan, Peoples R China.

年份：2019

卷号：85

期号：20

外文期刊名：APPLIED AND ENVIRONMENTAL MICROBIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000490943900018)】；

基金：This work was supported by the National Natural Science Foundation of China (31601568).

语种：英文

外文关键词：ABC transporter; Listeria monocytogenes; TCS; cephalosporins; resistance

摘要：In Listeria monocytogenes, it has been proposed that the VirSR two-component signal transduction systems (TCSs) and two ATP-binding cassette (ABC) transporters, VirAB and AnrAB, constitute a complex TCS/ABC transporter system which has been recognized as a unique resistance mode. The role of the putative VirAB-VirSR-AnrAB system in antimicrobial resistance and the respective contributions of the members of the system to resistance were investigated in this study. We constructed gene deletion mutants of L. monocytogenes EGD-e and complemented strains of the mutants and determined MICs of antimicrobial agents against these strains against using the agar dilution method. We assessed the relative expression levels of target genes by reverse transcription-quantitative PCR (RT-qPCR) and measured promoter activity levels by beta-galactosidase assays. Our results showed that the VirAB-VirSR-AnrAB system mediates not only nisin and bacitracin resistance but also resistance to cephalosporins, ethidium bromide (EtBr), and benzalkonium chloride (BC). In this system, two ABC transporters, VirAB and AnrAB, play distinct roles in cefotaxime resistance: the former is responsible only for antimicrobial sensing and signaling by VirSR, while the latter contributes to transportation of antimicrobials. Notably, VirAB itself, rather than the VirAB-VirSR-AnrAB system as a whole, contributes to kanamycin and tetracycline resistance. On the basis of the results obtained from this study, we speculate that VirAB acts as a sensor for VirSR in response to cephalosporins, bacitracin, nisin, EtBr, and BC, while VirAB itself plays a role in response to kanamycin and tetracycline in L. monocytogenes EGD-e. IMPORTANCE This report describes TCS/ABC transporter modules characterized in Listeria monocytogenes EGD-e. The modules consist of the VirSR TCS and the VirAB and AnrAB ABC transporters. Our results showed that this system is involved in nisin and bacitracin resistance, as well as resistance to cephalosporins, ethidium bromide (EtBr), and benzalkonium chloride (BC). In this system, VirAB is responsible only for antimicrobial sensing and signaling by VirSR, while AnrAB contributes to transportation of antimicrobials. Interestingly, VirAB itself, rather than the VirAB-VirSR-AnrAB system as a whole, contributes to kanamycin and tetracycline resistance.