第37卷第2期2023年6月西昌学院学报(自然科学版)JournalofXichangUniversity(NaturalScienceEdition)Vol.37,No.2Jun.,2023XapR蛋白在嗜水气单胞菌抗生素耐药性中的功能傅钰瑛(福建船政交通职业学院安全与环境学院,福建福州350007)摘要:研究嗜水气单胞菌(Aeromonashydrophila)LysR型转录调节因子中XapR蛋白抗生素耐药的调控机制。通过测定嗜水气单胞菌ATCC7966(野生型菌株)与嗜水气单胞菌ATCC7966xapR基因缺失株(ΔxapR)对32种抗生素的最低抑菌浓度,系统地评价xapR基因抗生素耐药性;进一步利用定量蛋白质组学技术,探讨xapR参与嗜水气单胞菌调控的生物过程。结果表明:xapR基因缺失后细菌对头孢孟多的耐药性减弱;xapR基因可调控细菌碳代谢、TCA循环等多种代谢途径,此外还与外膜蛋白、TonB、ABC转运系统等抗性基因的表达密切相关。综上,XapR蛋白可通过调节细菌中心代谢途径以及多个抗性基因改变嗜水气单胞菌的耐药性。关键词:XapR;定量蛋白质组学;细菌耐药;嗜水气单胞菌;LTTRs中图分类号:Q936;S917.1文献标志码:A文章编号:1673⁃1891(2023)02⁃0007⁃08TheFunctionofXapRProteininAntibioticResistanceofAeromonasHydrophilaFUYuying(SchoolofSafetyandEnvironment,FujianChuanzhengCommunicationsCollege,Fuzhou,Anhui350007,China)Abstract:ThispaperstudiedtheregulationmechanismonantibioticresistanceofLTTRsfamilyproteinXapRinAeromo⁃nashydrophila.TheMinimumbactericidalconcentrationofAeromonashydrophilaATCC7966(wild-typestrain)andAeromonashydrophilaATCC7966xapRgenedeletionstrain(ΔxapR)against32antibioticsweremeasuredtoevaluatetheantibioticresistance.Further,quantitativeproteomicswereusedtoinvestigatetheeffectofxapRdeletiononthepro⁃teinexpressionofAeromonashydrophila.Theresultsshowedthatbycontrastwithwild-typestrainsintermsofantibioticsresistance,theminimumbactericidalconcentrationofcefamandolereducedby2timesinΔxapR.Subsequently,omicsanalysisshowedthatxapRcouldregulatebacterialcarbonmetabolism,TCAcycleandotherpathways,andalsocloselyrelatedtotheexpressionsofoutermembraneprotein,TonB,andABCtransportsystem.Inconclusion,XapRcanchangethedrugresistanceofAeromonashydrophilabyregulatingthecentralmetabolicpathwayandmultip...