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Xie Y, Tian L, Li G, Qu H, Sun J, Liang W, Li X, Wang X, Deng Z, Liu J, Ou HY. Emergence of the third-generation cephalosporin-resistant hypervirulent Klebsiella pneumoniae due to the acquisition of a self-transferable bla DHA-1-carrying plasmid by an ST23 strain. Virulence 2018; 9:838-844. [PMID: 29683780 PMCID: PMC5955457 DOI: 10.1080/21505594.2018.1456229] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Yingzhou Xie
- a State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Lijun Tian
- b Department of Critical Care Medicine , Ruijin Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , China
| | - Gang Li
- c Department of Laboratory Medicine , Jinshan Hospital Fudan University , Shanghai , China
| | - Hongping Qu
- b Department of Critical Care Medicine , Ruijin Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , China
| | - Jingyong Sun
- d Department of Clinical Microbiology , Ruijin Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , China
| | - Wei Liang
- e Department of Laboratory Medicine , the Second People's Hospital of Lianyungang , Jiangsu , China
| | - Xiaobin Li
- a State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Xiaoli Wang
- b Department of Critical Care Medicine , Ruijin Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , China
| | - Zixin Deng
- a State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai , China
| | - Jialin Liu
- b Department of Critical Care Medicine , Ruijin Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , China
| | - Hong-Yu Ou
- a State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai , China.,f Shanghai Key Laboratory of Veterinary Biotechnology , School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai , China
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Qian H, Yao Q, Tai C, Deng Z, Gan J, Ou HY. Identification and characterization of acetyltransferase-type toxin-antitoxin locus in Klebsiella pneumoniae. Mol Microbiol 2018; 108:336-349. [PMID: 29461656 DOI: 10.1111/mmi.13934] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/15/2018] [Indexed: 01/09/2023]
Abstract
A type II toxin-antitoxin (TA) system, in which the toxin contains a Gcn5-related N-acetyltransferase (GNAT) domain, has been characterized recently. GNAT toxin acetylates aminoacyl-tRNA and blocks protein translation. It is abolished by the cognate antitoxin that contains the ribbon-helix-helix (RHH) domain. Here, we present an experimental demonstration of the interaction of the GNAT-RHH complex with TA promoter DNA. First, the GNAT-RHH TA locus kacAT was found in Klebsiella pneumoniae HS11286, a strain resistant to multiple antibiotics. Overexpression of KacT halted cell growth and resulted in persister cell formation. The crystal structure also indicated that KacT is a typical acetyltransferase toxin. Co-expression of KacA neutralized KacT toxicity. Expression of the bicistronic kacAT locus was up-regulated during antibiotic stress. Finally, KacT and KacA formed a heterohexamer that interacted with promoter DNA, resulting in negative autoregulation of kacAT transcription. The N-terminus region of KacA accounted for specific binding to the palindromic sequence on the operator DNA, whereas its C-terminus region was essential for the inactivation of the GNAT toxin. These results provide an important insight into the regulation of the GNAT-RHH family TA system.
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Affiliation(s)
- Hongliang Qian
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Qingqing Yao
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, Shanghai, China
| | - Cui Tai
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Jianhua Gan
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, Shanghai, China
| | - Hong-Yu Ou
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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