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Lai JH, Yang JT, Chern J, Chen TL, Wu WL, Liao JH, Tsai SF, Liang SY, Chou CC, Wu SH. Comparative Phosphoproteomics Reveals the Role of AmpC β-lactamase Phosphorylation in the Clinical Imipenem-resistant Strain Acinetobacter baumannii SK17. Mol Cell Proteomics 2015; 15:12-25. [PMID: 26499836 DOI: 10.1074/mcp.m115.051052] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Indexed: 01/13/2023] Open
Abstract
Nosocomial infectious outbreaks caused by multidrug-resistant Acinetobacter baumannii have emerged as a serious threat to human health. Phosphoproteomics of pathogenic bacteria has been used to identify the mechanisms of bacterial virulence and antimicrobial resistance. In this study, we used a shotgun strategy combined with high-accuracy mass spectrometry to analyze the phosphoproteomics of the imipenem-susceptible strain SK17-S and -resistant strain SK17-R. We identified 410 phosphosites on 248 unique phosphoproteins in SK17-S and 285 phosphosites on 211 unique phosphoproteins in SK17-R. The distributions of the Ser/Thr/Tyr/Asp/His phosphosites in SK17-S and SK17-R were 47.0%/27.6%/12.4%/8.0%/4.9% versus 41.4%/29.5%/17.5%/6.7%/4.9%, respectively. The Ser-90 phosphosite, located on the catalytic motif S(88)VS(90)K of the AmpC β-lactamase, was first identified in SK17-S. Based on site-directed mutagenesis, the nonphosphorylatable mutant S90A was found to be more resistant to imipenem, whereas the phosphorylation-simulated mutant S90D was sensitive to imipenem. Additionally, the S90A mutant protein exhibited higher β-lactamase activity and conferred greater bacterial protection against imipenem in SK17-S compared with the wild-type. In sum, our results revealed that in A. baumannii, Ser-90 phosphorylation of AmpC negatively regulates both β-lactamase activity and the ability to counteract the antibiotic effects of imipenem. These findings highlight the impact of phosphorylation-mediated regulation in antibiotic-resistant bacteria on future drug design and new therapies.
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Affiliation(s)
- Juo-Hsin Lai
- From the ‡Institute of Biochemical Sciences, College of Life Sciences, National Taiwan University, Taipei 10617, Taiwan; §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan
| | - Jhih-Tian Yang
- §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan; ¶Ph.D. Program in Microbial Genomics, National Chung Hsing University and Academia Sinica, Taiwan
| | - Jeffy Chern
- §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan; ‖Chemical Biology and Molecular Biophysics Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan; **Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Te-Li Chen
- ‡‡Institute of Clinical Medicine, School of Medicine, National Yang Ming University, Taipei 11221, Taiwan; §§Division of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, Taipei 11217, Taiwan; ¶¶Department of Medicine, Cheng Hsin General Hospital, Taipei 11220, Taiwan
| | - Wan-Ling Wu
- §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan
| | - Jiahn-Haur Liao
- §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan
| | - Shih-Feng Tsai
- ‖‖Department of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taipei 11221, Taiwan; Institute of Molecular and Genomic Medicine, National Health Research Institutes, Miaoli 35053, Taiwan
| | - Suh-Yuen Liang
- §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan; Core Facilities for Protein Structural Analysis, Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Chi-Chi Chou
- §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan; Core Facilities for Protein Structural Analysis, Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Shih-Hsiung Wu
- From the ‡Institute of Biochemical Sciences, College of Life Sciences, National Taiwan University, Taipei 10617, Taiwan; §Institute of Biological Chemistry, Academia Sinica. Taipei 11529, Taiwan; ‖Chemical Biology and Molecular Biophysics Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan; **Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan;
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Chan FY, Neves MAC, Sun N, Tsang MW, Leung YC, Chan TH, Abagyan R, Wong KY. Validation of the AmpC β-Lactamase Binding Site and Identification of Inhibitors with Novel Scaffolds. J Chem Inf Model 2012; 52:1367-75. [DOI: 10.1021/ci300068m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fung-Yi Chan
- Department
of Applied Biology
and Chemical Technology and State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon,
Hong Kong, P. R. China
| | - Marco A. C. Neves
- Skaggs School of Pharmacy & Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- Centro de Neurociências,
Lab. Química Farmacêutica, Faculdade de Farmácia, Universidade de Coimbra, Pólo das Ciências
da Saúde, 3000-548 Coimbra, Portugal
| | - Ning Sun
- Department
of Applied Biology
and Chemical Technology and State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon,
Hong Kong, P. R. China
| | - Man-Wah Tsang
- Department
of Applied Biology
and Chemical Technology and State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon,
Hong Kong, P. R. China
| | - Yun-Chung Leung
- Department
of Applied Biology
and Chemical Technology and State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon,
Hong Kong, P. R. China
| | - Tak-Hang Chan
- Department
of Applied Biology
and Chemical Technology and State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon,
Hong Kong, P. R. China
| | - Ruben Abagyan
- Skaggs School of Pharmacy & Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Kwok-Yin Wong
- Department
of Applied Biology
and Chemical Technology and State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon,
Hong Kong, P. R. China
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Tsang MW, Chan PH, So PK, Ma DL, Tsang CW, Wong KY, Leung YC. Engineered Amp C β-Lactamase as a Fluorescent Screening Tool for Class C β-Lactamase Inhibitors. Anal Chem 2011; 83:1996-2004. [DOI: 10.1021/ac102595r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Man-Wah Tsang
- Department of Applied Biology and Chemical Technology, Central Laboratory of the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Pak-Ho Chan
- Department of Applied Biology and Chemical Technology, Central Laboratory of the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Pui-Kin So
- Department of Applied Biology and Chemical Technology, Central Laboratory of the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Dik-Lung Ma
- Department of Applied Biology and Chemical Technology, Central Laboratory of the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Chun-Wai Tsang
- Department of Applied Biology and Chemical Technology, Central Laboratory of the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Kwok-Yin Wong
- Department of Applied Biology and Chemical Technology, Central Laboratory of the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Yun-Chung Leung
- Department of Applied Biology and Chemical Technology, Central Laboratory of the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
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