{"title":"具有头孢他啶-阿维菌素耐药性的 KPC-84 型肺炎克雷伯菌 ST11 临床分离株的特征。","authors":"Yanqiao Gong, Yu Feng, Zhiyong Zong, Xiaoju Lv","doi":"10.1007/s10096-024-04910-y","DOIUrl":null,"url":null,"abstract":"<p><p>A novel KPC variant, KPC-84, identified in a Klebsiella pneumoniae isolate from China, exhibits a threonine (T) to proline (P) amino acid substitution at Ambler position 243(T243P), altering from the KPC-2 sequence. Cloning and expression of bla<sub>KPC-84</sub> in Escherichia coli, with subsequent MIC assessments, revealed increased resistance to ceftazidime-avibactam and significantly reduced carbapenemase activity compared to KPC-2. Kinetic measurements showed that KPC-84 exhibited sligthly higher hydrolysis of ceftazidime and reduced affinity for avibactam compared to KPC-2. This study emphasizes the emerging diversity of KPC variants with ceftazidime-avibactam resistance, underscoring the complexity of addressing carbapenem-resistant Klebsiella pneumoniae infections.</p>","PeriodicalId":11782,"journal":{"name":"European Journal of Clinical Microbiology & Infectious Diseases","volume":" ","pages":"2029-2035"},"PeriodicalIF":3.7000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Characterization of a KPC-84 harboring Klebsiella pneumoniae ST11 clinical isolate with ceftazidime-avibactam resistance.\",\"authors\":\"Yanqiao Gong, Yu Feng, Zhiyong Zong, Xiaoju Lv\",\"doi\":\"10.1007/s10096-024-04910-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>A novel KPC variant, KPC-84, identified in a Klebsiella pneumoniae isolate from China, exhibits a threonine (T) to proline (P) amino acid substitution at Ambler position 243(T243P), altering from the KPC-2 sequence. Cloning and expression of bla<sub>KPC-84</sub> in Escherichia coli, with subsequent MIC assessments, revealed increased resistance to ceftazidime-avibactam and significantly reduced carbapenemase activity compared to KPC-2. Kinetic measurements showed that KPC-84 exhibited sligthly higher hydrolysis of ceftazidime and reduced affinity for avibactam compared to KPC-2. This study emphasizes the emerging diversity of KPC variants with ceftazidime-avibactam resistance, underscoring the complexity of addressing carbapenem-resistant Klebsiella pneumoniae infections.</p>\",\"PeriodicalId\":11782,\"journal\":{\"name\":\"European Journal of Clinical Microbiology & Infectious Diseases\",\"volume\":\" \",\"pages\":\"2029-2035\"},\"PeriodicalIF\":3.7000,\"publicationDate\":\"2024-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"European Journal of Clinical Microbiology & Infectious Diseases\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1007/s10096-024-04910-y\",\"RegionNum\":3,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2024/8/7 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q2\",\"JCRName\":\"INFECTIOUS DISEASES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"European Journal of Clinical Microbiology & Infectious Diseases","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1007/s10096-024-04910-y","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/8/7 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"INFECTIOUS DISEASES","Score":null,"Total":0}
Characterization of a KPC-84 harboring Klebsiella pneumoniae ST11 clinical isolate with ceftazidime-avibactam resistance.
A novel KPC variant, KPC-84, identified in a Klebsiella pneumoniae isolate from China, exhibits a threonine (T) to proline (P) amino acid substitution at Ambler position 243(T243P), altering from the KPC-2 sequence. Cloning and expression of blaKPC-84 in Escherichia coli, with subsequent MIC assessments, revealed increased resistance to ceftazidime-avibactam and significantly reduced carbapenemase activity compared to KPC-2. Kinetic measurements showed that KPC-84 exhibited sligthly higher hydrolysis of ceftazidime and reduced affinity for avibactam compared to KPC-2. This study emphasizes the emerging diversity of KPC variants with ceftazidime-avibactam resistance, underscoring the complexity of addressing carbapenem-resistant Klebsiella pneumoniae infections.
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EJCMID is an interdisciplinary journal devoted to the publication of communications on infectious diseases of bacterial, viral and parasitic origin.
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