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Sekiya H, Nonaka Y, Kamitori S, Miyaji T, Tamai E. X-ray structure and mutagenesis analyses of Clostridioides difficile endolysin Ecd09610 glucosaminidase domain. Biochem Biophys Res Commun 2024; 715:149957. [PMID: 38688057 DOI: 10.1016/j.bbrc.2024.149957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 04/15/2024] [Accepted: 04/15/2024] [Indexed: 05/02/2024]
Abstract
Clostridioides difficile endolysin (Ecd09610) consists of an unknown domain at its N terminus, followed by two catalytic domains, a glucosaminidase domain and endopeptidase domain. X-ray structure and mutagenesis analyses of the Ecd09610 catalytic domain with glucosaminidase activity (Ecd09610CD53) were performed. Ecd09610CD53 was found to possess an α-bundle-like structure with nine helices, which is well conserved among GH73 family enzymes. The mutagenesis analysis based on X-ray structures showed that Glu405 and Asn470 were essential for enzymatic activity. Ecd09610CD53 may adopt a neighboring-group mechanism for a catalytic reaction in which Glu405 acted as an acid/base catalyst and Asn470 helped to stabilize the oxazolinium ion intermediate. Structural comparisons with the newly identified Clostridium perfringens autolysin catalytic domain (AcpCD) in the P1 form and a zymography analysis demonstrated that AcpCD was 15-fold more active than Ecd09610CD53. The strength of the glucosaminidase activity of the GH73 family appears to be dependent on the depth of the substrate-binding groove.
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Affiliation(s)
- Hiroshi Sekiya
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, 4-2 Bunkyo-cho, Matsuyama, Ehime, 790-8578, Japan
| | - Yasuhiro Nonaka
- Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan
| | - Shigehiro Kamitori
- Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan; Research Facility Center for Science & Technology, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan
| | - Tomomi Miyaji
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, 4-2 Bunkyo-cho, Matsuyama, Ehime, 790-8578, Japan
| | - Eiji Tamai
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, 4-2 Bunkyo-cho, Matsuyama, Ehime, 790-8578, Japan.
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2
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Wang M, Deng Z, Li Y, Ma Y, Wang J. Design and characterization of a novel lytic protein against Clostridium difficile. Appl Microbiol Biotechnol 2022; 106:4511-4521. [PMID: 35699735 PMCID: PMC9194777 DOI: 10.1007/s00253-022-12010-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/29/2022] [Accepted: 06/01/2022] [Indexed: 11/29/2022]
Abstract
Abstract Clostridium difficile (C. difficile) is a Gram-positive, spore-forming, toxin-producing anaerobe that can cause nosocomial antibiotic-associated intestinal disease. Autolysin is a lytic enzyme that hydrolyzes peptidoglycans of the bacterial cell wall, with a catalytic domain and cell wall–binding domains, proven to be involved in bacterial cell wall remodeling and cell division. Although autolysins in C. difficile have been reported, the autolysins have failed to yield impressive results when used as exogenous lytic agents. In this study, we expressed and characterized the binding domains (Cwp19-BD and Acd-BD) and catalytic domains (Cwp19-CD, Acd-CD, and Cwl-CD) of C. difficile autolysins, and the domains with the best binding specificity and lytic activity were selected towards C. difficile to design a novel lytic protein Cwl-CWB2. Cwl-CWB2 showed good biosafety with significantly low hemolysis and without cytotoxicity. The results of fluorescence analysis and lytic assay demonstrated that Cwl-CWB2 has higher binding specificity and stronger lytic activity with a minimum inhibitory concentration at 13.39 ± 5.80 μg/mL against living C. difficile cells, which is significantly stronger than commercial lysozyme (3333.33 ± 1443.37 μg/mL) and other reported C. difficile autolysins. Besides, Cwl-CWB2 exhibited good stability as about 75% of the lytic activity was still retained when incubated at 37 °C for 96 h, which is considered to be a potential antimicrobial agent to combat C. difficile. Key points • Several binding domains and catalytic domains, deriving from several Clostridium difficile autolysins, were expressed, purified, and functionally characterized. • A novel C. difficile lytic protein Cwl-CWB2 was designed from C. difficile autolysins. • The binding specificity and lytic activity of Cwl-CWB2 against C. difficile showed advantages compared with other reported C. difficile autolysins. • Cwl-CWB2 exhibited significantly low hemolysis and cytotoxicity against normal-derived colon mucosa 460 cell. Graphical abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1007/s00253-022-12010-0.
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Affiliation(s)
- Meng Wang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Zifeng Deng
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Yanmei Li
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Yi Ma
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Jufang Wang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, 510006, China.
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3
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Su Y, Liu C, Du J, Jiang X, Wei W, Tong X. Monitoring of the yogurt fermentation process based on a rapid bio-luminescent chiral pattern recognition of amino acids. Analyst 2022; 147:4570-4577. [DOI: 10.1039/d2an01011a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A luminescent bacterial sensor array was established for the discrimination of multiple chiral amino acids and the monitoring of the yogurt fermentation process.
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Affiliation(s)
- Yuchen Su
- School of Pharmaceutical Sciences, Chongqing University, No. 55, Daxuecheng South Road, Shapingba District, Chongqing 401331, P. R. China
| | - Chunlan Liu
- School of Pharmaceutical Sciences, Chongqing University, No. 55, Daxuecheng South Road, Shapingba District, Chongqing 401331, P. R. China
| | - Jiayin Du
- School of Pharmaceutical Sciences, Chongqing University, No. 55, Daxuecheng South Road, Shapingba District, Chongqing 401331, P. R. China
| | - Xuemei Jiang
- School of Pharmaceutical Sciences, Chongqing University, No. 55, Daxuecheng South Road, Shapingba District, Chongqing 401331, P. R. China
| | - Weili Wei
- School of Pharmaceutical Sciences, Chongqing University, No. 55, Daxuecheng South Road, Shapingba District, Chongqing 401331, P. R. China
| | - Xiaoyong Tong
- School of Pharmaceutical Sciences, Chongqing University, No. 55, Daxuecheng South Road, Shapingba District, Chongqing 401331, P. R. China
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4
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Sekiya H, Tamai E, Kawasaki J, Murakami K, Kamitori S. Structural and biochemical characterizations of the novel autolysin Acd24020 from Clostridioides difficile and its full-function catalytic domain as a lytic enzyme. Mol Microbiol 2020; 115:684-698. [PMID: 33140473 DOI: 10.1111/mmi.14636] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 10/13/2020] [Accepted: 10/28/2020] [Indexed: 12/17/2022]
Abstract
Autolysin is a lytic enzyme that hydrolyzes peptidoglycans of the bacterial cell wall, with a catalytic domain and cell wall-binding (CWB) domains, to be involved in different physiological functions that require bacterial cell wall remodeling. We identified a novel autolysin, Acd24020, from Clostridioides (Clostridium) difficile (C. difficile), with an endopeptidase catalytic domain belonging to the NlpC/P60 family and three bacterial Src-homology 3 domains as CWB domains. The catalytic domain of Acd24020 (Acd24020-CD) exhibited C. difficile-specific lytic activity equivalent to Acd24020, indicating that Acd24020-CD has full-function as a lytic enzyme by itself. To elucidate the specific peptidoglycan-recognition and catalytic reaction mechanisms of Acd24020-CD, biochemical characterization, X-ray structure determination, a modeling study of the enzyme/substrate complex, and mutagenesis analysis were performed. Acd24020-CD has an hourglass-shaped substrate-binding groove across the molecule, which is responsible for recognizing the direct 3-4 cross-linking structure unique to C. difficile peptidoglycan. Based on the X-ray structure and modeling study, we propose a dynamic Cys/His catalyzing mechanism, in which the catalytic Cys299 and His354 residues dynamically change their conformations to complement each step of the enzyme catalytic reaction.
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Affiliation(s)
- Hiroshi Sekiya
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Matsuyama, Japan
| | - Eiji Tamai
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Matsuyama, Japan.,Life Science Research Center and Faculty of Medicine, Kagawa University, Miki-cho, Kita-gun, Japan
| | - Jurina Kawasaki
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Matsuyama, Japan
| | - Kaho Murakami
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Matsuyama, Japan
| | - Shigehiro Kamitori
- Life Science Research Center and Faculty of Medicine, Kagawa University, Miki-cho, Kita-gun, Japan
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5
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Idrees M, Mohammad AR, Karodia N, Rahman A. Multimodal Role of Amino Acids in Microbial Control and Drug Development. Antibiotics (Basel) 2020; 9:E330. [PMID: 32560458 PMCID: PMC7345125 DOI: 10.3390/antibiotics9060330] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/09/2020] [Accepted: 06/16/2020] [Indexed: 12/16/2022] Open
Abstract
Amino acids are ubiquitous vital biomolecules found in all kinds of living organisms including those in the microbial world. They are utilised as nutrients and control many biological functions in microorganisms such as cell division, cell wall formation, cell growth and metabolism, intermicrobial communication (quorum sensing), and microbial-host interactions. Amino acids in the form of enzymes also play a key role in enabling microbes to resist antimicrobial drugs. Antimicrobial resistance (AMR) and microbial biofilms are posing a great threat to the world's human and animal population and are of prime concern to scientists and medical professionals. Although amino acids play an important role in the development of microbial resistance, they also offer a solution to the very same problem i.e., amino acids have been used to develop antimicrobial peptides as they are highly effective and less prone to microbial resistance. Other important applications of amino acids include their role as anti-biofilm agents, drug excipients, drug solubility enhancers, and drug adjuvants. This review aims to explore the emerging paradigm of amino acids as potential therapeutic moieties.
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Affiliation(s)
- Muhammad Idrees
- Faculty of Science and Technology, University of Wolverhampton, Wolverhampton WV1 1LY, UK; (M.I.); (N.K.)
| | | | - Nazira Karodia
- Faculty of Science and Technology, University of Wolverhampton, Wolverhampton WV1 1LY, UK; (M.I.); (N.K.)
| | - Ayesha Rahman
- Faculty of Science and Technology, University of Wolverhampton, Wolverhampton WV1 1LY, UK; (M.I.); (N.K.)
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6
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Zhang F, Lu C, Wang M, Yu X, Wei W, Xia Z. A Chiral Sensor Array for Peptidoglycan Biosynthesis Monitoring Based on MoS 2 Nanosheet-Supported Host-Guest Recognitions. ACS Sens 2018; 3:304-312. [PMID: 29299925 DOI: 10.1021/acssensors.7b00676] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Monitoring the dynamic change with respect to chirality and species of amino acids in bacterial peptidoglycan (PG) during cell wall biosynthesis is correlated with bacterial taxonomy, physiology, micropathology, and antibacterial mechanisms. However, this is challenging because reported methods usually lack the ability of chiral analysis with the coexistence of d- and l-amino acids in PG. Here we report a chiral sensor array for PG biosynthesis monitoring through chiral amino acid recognition. Multitypes of host molecule modified MoS2 nanosheets (MNSs) were used as receptor units to achieve more accurate and specific sensing. By applying indicator displacement strategy, the distinct and reproducible fluorescence-response patterns were obtained for linear discriminant analysis (LDA) to accurately discriminate achiral Gly, 19 l-amino acids and the corresponding 19 d-enantiomers simultaneously. The sensor array has also been used for identifying bacterial species and tracking the subtle change of amino acid composition of PG including chirality and species during biosynthesis in different growth status and exogenous d-amino acid stimulation.
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Affiliation(s)
- Feng Zhang
- School of Pharmaceutical
Sciences and Innovative Drug Research Centre, Chongqing University, Chongqing 401331, PR China
| | - Chenwei Lu
- School of Pharmaceutical
Sciences and Innovative Drug Research Centre, Chongqing University, Chongqing 401331, PR China
| | - Min Wang
- School of Pharmaceutical
Sciences and Innovative Drug Research Centre, Chongqing University, Chongqing 401331, PR China
| | - Xinsheng Yu
- School of Pharmaceutical
Sciences and Innovative Drug Research Centre, Chongqing University, Chongqing 401331, PR China
| | - Weili Wei
- School of Pharmaceutical
Sciences and Innovative Drug Research Centre, Chongqing University, Chongqing 401331, PR China
| | - Zhining Xia
- School of Pharmaceutical
Sciences and Innovative Drug Research Centre, Chongqing University, Chongqing 401331, PR China
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7
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Tamai E, Sekiya H, Maki J, Nariya H, Yoshida H, Kamitori S. X-ray structure of Clostridium perfringens sortase B cysteine transpeptidase. Biochem Biophys Res Commun 2017; 493:1267-1272. [DOI: 10.1016/j.bbrc.2017.09.144] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 09/26/2017] [Indexed: 10/18/2022]
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8
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Margulieux KR, Liebov BK, Tirumala VSKKS, Singh A, Bushweller JH, Nakamoto RK, Hughes MA. Bacillus anthracis Peptidoglycan Integrity Is Disrupted by the Chemokine CXCL10 through the FtsE/X Complex. Front Microbiol 2017; 8:740. [PMID: 28496437 PMCID: PMC5406473 DOI: 10.3389/fmicb.2017.00740] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 04/10/2017] [Indexed: 01/07/2023] Open
Abstract
The antimicrobial activity of the chemokine CXCL10 against vegetative cells of Bacillus anthracis occurs via both bacterial FtsE/X-dependent and-independent pathways. Previous studies established that the FtsE/X-dependent pathway was mediated through interaction of the N-terminal region(s) of CXCL10 with a functional FtsE/X complex, while the FtsE/X-independent pathway was mediated through the C-terminal α-helix of CXCL10. Both pathways result in cell lysis and death of B. anthracis. In other bacterial species, it has been shown that FtsE/X is involved in cellular elongation though activation of complex-associated peptidoglycan hydrolases. Thus, we hypothesized that the CXCL10-mediated killing of vegetative cells of B. anthracis through the FtsE/X-dependent pathway resulted from the disruption of peptidoglycan processing. Immunofluorescence microscopy studies using fluorescent peptidoglycan probes revealed that incubation of B. anthracis Sterne (parent) strain with CXCL10 or a C-terminal truncated CXCL10 (CTTC) affected peptidoglycan processing and/or incorporation of precursors into the cell wall. B. anthracis ΔftsX or ftsE(K123A/D481N) mutant strains, which lacked a functional FtsE/X complex, exhibited little to no evidence of disruption in peptidoglycan processing by either CXCL10 or CTTC. Additional studies demonstrated that the B. anthracis parent strain exhibited a statistically significant increase in peptidoglycan release in the presence of either CXCL10 or CTTC. While B. anthracis ΔftsX strain showed increased peptidoglycan release in the presence of CXCL10, no increase was observed with CTTC, suggesting that the FtsE/X-independent pathway was responsible for the activity observed with CXCL10. These results indicate that FtsE/X-dependent killing of vegetative cells of B. anthracis results from a loss of cell wall integrity due to disruption of peptidoglycan processing and suggest that FtsE/X may be an important antimicrobial target to study in the search for alternative microbial therapeutics.
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Affiliation(s)
- Katie R Margulieux
- Division of Infectious Diseases and International Health, Department of Medicine, School of Medicine, University of Virginia, CharlottesvilleVA, USA
| | - Benjamin K Liebov
- Department of Chemistry, University of Virginia, CharlottesvilleVA, USA
| | - Venkata S K K S Tirumala
- Department of Molecular Physiology and Biological Physics, University of Virginia, CharlottesvilleVA, USA
| | - Arpita Singh
- Division of Infectious Diseases and International Health, Department of Medicine, School of Medicine, University of Virginia, CharlottesvilleVA, USA
| | - John H Bushweller
- Department of Molecular Physiology and Biological Physics, University of Virginia, CharlottesvilleVA, USA
| | - Robert K Nakamoto
- Department of Molecular Physiology and Biological Physics, University of Virginia, CharlottesvilleVA, USA
| | - Molly A Hughes
- Division of Infectious Diseases and International Health, Department of Medicine, School of Medicine, University of Virginia, CharlottesvilleVA, USA
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9
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Synthesis and antimicrobial activity of p-menth-3-en-1-amine amide derivatives. RESEARCH ON CHEMICAL INTERMEDIATES 2016. [DOI: 10.1007/s11164-016-2833-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Tamai E, Sekiya H, Goda E, Makihata N, Maki J, Yoshida H, Kamitori S. Structural and biochemical characterization of the Clostridium perfringens autolysin catalytic domain. FEBS Lett 2016; 591:231-239. [PMID: 27926788 DOI: 10.1002/1873-3468.12515] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 11/17/2016] [Accepted: 11/26/2016] [Indexed: 11/08/2022]
Abstract
Bacterial autolysins can partially hydrolyze cell wall peptidoglycans into small sections to regulate cell separation/division and the growth phase. Clostridium perfringens autolysin (Acp) has an N-terminal cell wall-binding domain and a C-terminal catalytic domain with glucosaminidase activity that belongs to the glycoside hydrolase 73 family. Here, we determined the X-ray structure of the Acp catalytic domain (AcpCD) at 1.76 Å resolution. AcpCD has a unique crescent-shaped structure, forming a deep groove for substrate-binding at the center of the protein. The modeling study of the enzyme/substrate complex demonstrated that the length of the substrate-binding groove is closely related to the glucosaminidase activity. Mutagenesis analysis showed that AcpCD likely adopts a neighboring-group mechanism for the catalytic reaction.
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Affiliation(s)
- Eiji Tamai
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Bunkyo-cho, Ehime, Japan.,Life Science Research Center and Faculty of Medicine, Kagawa University, Miki-cho, Kita-gun, Kagawa, Japan
| | - Hiroshi Sekiya
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Bunkyo-cho, Ehime, Japan
| | - Eri Goda
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Bunkyo-cho, Ehime, Japan
| | - Nahomi Makihata
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Bunkyo-cho, Ehime, Japan
| | - Jun Maki
- Department of Infectious Disease, College of Pharmaceutical Science, Matsuyama University, Bunkyo-cho, Ehime, Japan
| | - Hiromi Yoshida
- Life Science Research Center and Faculty of Medicine, Kagawa University, Miki-cho, Kita-gun, Kagawa, Japan
| | - Shigehiro Kamitori
- Life Science Research Center and Faculty of Medicine, Kagawa University, Miki-cho, Kita-gun, Kagawa, Japan
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11
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Nanomechanical Characterization of Bacillus anthracis Spores by Atomic Force Microscopy. Appl Environ Microbiol 2016; 82:2988-2999. [PMID: 26969703 DOI: 10.1128/aem.00431-16] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 03/04/2016] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED The study of structures and properties of bacterial spores is important to understanding spore formation and biological responses to environmental stresses. While significant progress has been made over the years in elucidating the multilayer architecture of spores, the mechanical properties of the spore interior are not known. Here, we present a thermal atomic force microscopy (AFM) study of the nanomechanical properties of internal structures of Bacillus anthracis spores. We developed a nanosurgical sectioning method in which a stiff diamond AFM tip was used to cut an individual spore, exposing its internal structure, and a soft AFM tip was used to image and characterize the spore interior on the nanometer scale. We observed that the elastic modulus and adhesion force, including their thermal responses at elevated temperatures, varied significantly in different regions of the spore section. Our AFM images indicated that the peptidoglycan (PG) cortex of Bacillus anthracis spores consisted of rod-like nanometer-sized structures that are oriented in the direction perpendicular to the spore surface. Our findings may shed light on the spore architecture and properties. IMPORTANCE A nanosurgical AFM method was developed that can be used to probe the structure and properties of the spore interior. The previously unknown ultrastructure of the PG cortex of Bacillus anthracis spores was observed to consist of nanometer-sized rod-like structures that are oriented in the direction perpendicular to the spore surface. The variations in the nanomechanical properties of the spore section were largely correlated with its chemical composition. Different components of the spore materials showed different thermal responses at elevated temperatures.
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12
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Jamasbi E, Ciccotosto GD, Tailhades J, Robins-Browne RM, Ugalde CL, Sharples RA, Patil N, Wade JD, Hossain MA, Separovic F. Site of fluorescent label modifies interaction of melittin with live cells and model membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2031-9. [PMID: 26051124 DOI: 10.1016/j.bbamem.2015.06.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Revised: 05/30/2015] [Accepted: 06/02/2015] [Indexed: 02/01/2023]
Abstract
The mechanism of membrane disruption by melittin (MLT) of giant unilamellar vesicles (GUVs) and live cells was studied using fluorescence microscopy and two fluorescent synthetic analogues of MLT. The N-terminus of one of these was acylated with thiopropionic acid to enable labeling with maleimido-AlexaFluor 430 to study the interaction of MLT with live cells. It was compared with a second analogue labeled at P14C. The results indicated that the fluorescent peptides adhered to the membrane bilayer of phosphatidylcholine GUVs and inserted into the plasma membrane of HeLa cells. Fluorescence and light microscopy revealed changes in cell morphology after exposure to MLT peptides and showed bleb formation in the plasma membrane of HeLa cells. However, the membrane disruptive effect was dependent upon the location of the fluorescent label on the peptide and was greater when MLT was labeled at the N-terminus. Proline at position 14 appeared to be important for antimicrobial activity, hemolysis and cytotoxicity, but not essential for cell membrane disruption.
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Affiliation(s)
- Elaheh Jamasbi
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia
| | | | - Julien Tailhades
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, VIC 3010, Australia
| | - Roy M Robins-Browne
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, VIC 3010, Australia; Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, VIC 3052, Australia
| | - Cathryn L Ugalde
- Department of Biochemistry & Molecular Biology, Bio21 Institute, The University of Melbourne, VIC 3010, Australia
| | - Robyn A Sharples
- Department of Biochemistry & Molecular Biology, Bio21 Institute, The University of Melbourne, VIC 3010, Australia
| | - Nitin Patil
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia; The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, VIC 3010, Australia
| | - John D Wade
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia; The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, VIC 3010, Australia
| | - Mohammed Akhter Hossain
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia; The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, VIC 3010, Australia
| | - Frances Separovic
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia
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13
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Jamasbi E, Batinovic S, Sharples RA, Sani MA, Robins-Browne RM, Wade JD, Separovic F, Hossain MA. Melittin peptides exhibit different activity on different cells and model membranes. Amino Acids 2014; 46:2759-66. [DOI: 10.1007/s00726-014-1833-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 08/26/2014] [Indexed: 11/30/2022]
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14
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Tamai E, Yoshida H, Sekiya H, Nariya H, Miyata S, Okabe A, Kuwahara T, Maki J, Kamitori S. X-ray structure of a novel endolysin encoded by episomal phage phiSM101 ofClostridium perfringens. Mol Microbiol 2014; 92:326-37. [DOI: 10.1111/mmi.12559] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/17/2014] [Indexed: 12/01/2022]
Affiliation(s)
- Eiji Tamai
- Life Science Research Center; Kagawa University; 1750-1, Ikenobe, Miki-cho Kita-gun Kagawa 761-0793 Japan
- Department of Infectious Disease; College of Pharmaceutical Science; Matsuyama University; 4-2 Bunkyo-cho Matsuyama Ehime 790-8578 Japan
| | - Hiromi Yoshida
- Life Science Research Center; Kagawa University; 1750-1, Ikenobe, Miki-cho Kita-gun Kagawa 761-0793 Japan
| | - Hiroshi Sekiya
- Department of Infectious Disease; College of Pharmaceutical Science; Matsuyama University; 4-2 Bunkyo-cho Matsuyama Ehime 790-8578 Japan
| | - Hirofumi Nariya
- Department of Microbiology; Faculty of Medicine; Kagawa University; 1750-1, Ikenobe, Miki-cho Kita-gun Kagawa 761-0793 Japan
| | - Shigeru Miyata
- Life Science Research Center; Kagawa University; 1750-1, Ikenobe, Miki-cho Kita-gun Kagawa 761-0793 Japan
- College of Bioscience and Biotechnology; Chubu University; 1200 Matsumoto-cho Kasugai Aichi 487-8501 Japan
| | - Akinobu Okabe
- Department of Human Nutrition; Faculty of Contemporary Life Science; Chugokugakuen University; Niwase 83 Kita-ku Okayama 761-0197 Japan
| | - Tomomi Kuwahara
- Department of Microbiology; Faculty of Medicine; Kagawa University; 1750-1, Ikenobe, Miki-cho Kita-gun Kagawa 761-0793 Japan
| | - Jun Maki
- Department of Infectious Disease; College of Pharmaceutical Science; Matsuyama University; 4-2 Bunkyo-cho Matsuyama Ehime 790-8578 Japan
| | - Shigehiro Kamitori
- Life Science Research Center; Kagawa University; 1750-1, Ikenobe, Miki-cho Kita-gun Kagawa 761-0793 Japan
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