1
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Hu Z, Shan J, Cui Y, Cheng L, Chen XL, Wang X. Nanozyme-Incorporated Microneedles for the Treatment of Chronic Wounds. Adv Healthc Mater 2024; 13:e2400101. [PMID: 38794907 DOI: 10.1002/adhm.202400101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 03/28/2024] [Indexed: 05/26/2024]
Abstract
Acute wounds are converted to chronic wounds due to advanced age and diabetic complications. Nanozymes catalyze ROS production to kill bacteria without causing drug resistance, while microneedles (MNs) can break through the skin barrier to deliver drugs effectively. Nanozymes can be intergrateded into MNs delivery systems to improve painless drug delivery. It can also reduce the effective dose of drug sterilization while increasing delivery efficiency and effectively killing wounded bacteria while preventing drug resistance. This paper describes various types of metal nanozymes from previous studies and compares their mutual enhancement with nanozymes. The pooled results show that the MNs, through material innovation, are able to both penetrate the scab and deliver nanozymes and exert additional anti-inflammatory and bactericidal effects. The catalytic effect of some of the nanozymes can also accelerate the lysis of the MNs or create a cascade reaction against inflammation and infection. However, the issue of increased toxicity associated with skin penetration and clinical translation remains a challenge. This study reviews the latest published results and corresponding challenges associated with the use of MNs combined with nanozymes for the treatment of wounds, providing further information for future research.
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Affiliation(s)
- Zhiyuan Hu
- Department of Burns, The First Hospital Affiliated Anhui Medical University, Hefei, Anhui, 230032, P. R. China
- School of Biomedical Engineering, Research and Engineering Center of Biomedical Materials, Anhui Medical University, Hefei, Anhui, 230032, P. R. China
| | - Jie Shan
- Department of Burns, The First Hospital Affiliated Anhui Medical University, Hefei, Anhui, 230032, P. R. China
| | - Yuyu Cui
- Department of Burns, The First Hospital Affiliated Anhui Medical University, Hefei, Anhui, 230032, P. R. China
| | - Liang Cheng
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Soochow University, Suzhou, 215123, P. R. China
| | - Xu-Lin Chen
- Department of Burns, The First Hospital Affiliated Anhui Medical University, Hefei, Anhui, 230032, P. R. China
| | - Xianwen Wang
- School of Biomedical Engineering, Research and Engineering Center of Biomedical Materials, Anhui Medical University, Hefei, Anhui, 230032, P. R. China
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2
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Sharma P, Sharma S, Joshi S, Barman P, Bhatt A, Maan M, Singla N, Rishi P, Ali ME, Preet S, Saini A. Design, characterization and structure-function analysis of novel antimicrobial peptides based on the N-terminal CATH-2 fragment. Sci Rep 2022; 12:12058. [PMID: 35835842 PMCID: PMC9283491 DOI: 10.1038/s41598-022-16303-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 07/07/2022] [Indexed: 11/28/2022] Open
Abstract
The emergence of multidrug resistance coupled with shrinking antibiotic pipelines has increased the demand of antimicrobials with novel mechanisms of action. Therefore, researchers across the globe are striving to develop new antimicrobial substances to alleviate the pressure on conventional antibiotic therapies. Host-Defence Peptides (HDPs) and their derivatives are emerging as effective therapeutic agents against microbial resistance. In this study, five analogs (DP1-5) of the N-terminal (N-15) fragment of CATH-2 were designed based on the delicate balance between various physicochemical properties such as charge, aliphatic character, amphipathicity and hydrophobicity. By means of in-silico and in-vitro studies a novel peptide (DP1) with the sequence "RFGRFLRKILRFLKK" was found to be more effective and less toxic than the N-terminal CATH-2 peptide. Circular dichroism spectroscopy and differential scanning calorimetry were applied for structural insights. Antimicrobial, haemolytic, and cytotoxic activities were also assessed. The resulting peptide was characterized by low cytotoxicity, low haemolytic activity, and efficient anti-microbial activity. Structurally, it displayed strong helical properties irrespective of the solvent environment and was stable in membrane-mimicking environments. Taken together, the data suggests that DP1 can be explored as a promising therapeutic agent with possible clinical applications.
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Affiliation(s)
- Pratibha Sharma
- Department of Biophysics, Panjab University, Chandigarh, UT, 160014, India
| | - Sheetal Sharma
- Department of Biophysics, Panjab University, Chandigarh, UT, 160014, India
| | - Shubhi Joshi
- Energy Research Centre, Panjab University, Chandigarh, UT, 160014, India
| | - Panchali Barman
- Institute of Forensic Science and Criminology (UIEAST), Panjab University, Chandigarh, 160014, India
| | - Aashish Bhatt
- Institute of Nano Science and Technology, Sector-81, Knowledge City, Sahibzada Ajit Singh Nagar, Punjab, 140306, India
| | - Mayank Maan
- Department of Biophysics, Panjab University, Chandigarh, UT, 160014, India
| | - Neha Singla
- Department of Biophysics, Panjab University, Chandigarh, UT, 160014, India
| | - Praveen Rishi
- Department of Microbiology, Panjab University, Chandigarh, UT, 160014, India
| | - Md Ehesan Ali
- Institute of Nano Science and Technology, Sector-81, Knowledge City, Sahibzada Ajit Singh Nagar, Punjab, 140306, India
| | - Simran Preet
- Department of Biophysics, Panjab University, Chandigarh, UT, 160014, India
| | - Avneet Saini
- Department of Biophysics, Panjab University, Chandigarh, UT, 160014, India.
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3
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Nuti N, Rottmann P, Stucki A, Koch P, Panke S, Dittrich PS. A Multiplexed Cell-Free Assay to Screen for Antimicrobial Peptides in Double Emulsion Droplets. Angew Chem Int Ed Engl 2022; 61:e202114632. [PMID: 34989471 PMCID: PMC9303939 DOI: 10.1002/anie.202114632] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Indexed: 12/17/2022]
Abstract
The global surge in bacterial resistance against traditional antibiotics triggered intensive research for novel compounds, with antimicrobial peptides (AMPs) identified as a promising candidate. Automated methods to systematically generate and screen AMPs according to their membrane preference, however, are still lacking. We introduce a novel microfluidic system for the simultaneous cell-free production and screening of AMPs for their membrane specificity. On our device, AMPs are cell-free produced within water-in-oil-in-water double emulsion droplets, generated at high frequency. Within each droplet, the peptides can interact with different classes of co-encapsulated liposomes, generating a membrane-specific fluorescent signal. The double emulsions can be incubated and observed in a hydrodynamic trapping array or analyzed via flow cytometry. Our approach provides a valuable tool for the discovery and development of membrane-active antimicrobials.
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Affiliation(s)
- Nicola Nuti
- Department of Biosystems Science and EngineeringBioanalytics GroupETH ZürichMattenstrasse 264058BaselSwitzerland
| | - Philipp Rottmann
- Department of Biosystems Science and EngineeringBioprocess LaboratoryETH ZürichMattenstrasse 264058BaselSwitzerland
| | - Ariane Stucki
- Department of Biosystems Science and EngineeringBioanalytics GroupETH ZürichMattenstrasse 264058BaselSwitzerland
| | - Philipp Koch
- Department of Biosystems Science and EngineeringBioprocess LaboratoryETH ZürichMattenstrasse 264058BaselSwitzerland
| | - Sven Panke
- Department of Biosystems Science and EngineeringBioprocess LaboratoryETH ZürichMattenstrasse 264058BaselSwitzerland
| | - Petra S. Dittrich
- Department of Biosystems Science and EngineeringBioanalytics GroupETH ZürichMattenstrasse 264058BaselSwitzerland
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4
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Castillo-Juárez I, Blancas-Luciano BE, García-Contreras R, Fernández-Presas AM. Antimicrobial peptides properties beyond growth inhibition and bacterial killing. PeerJ 2022; 10:e12667. [PMID: 35116194 PMCID: PMC8785659 DOI: 10.7717/peerj.12667] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/01/2021] [Indexed: 01/07/2023] Open
Abstract
Antimicrobial peptides (AMPs) are versatile molecules with broad antimicrobial activity produced by representatives of the three domains of life. Also, there are derivatives of AMPs and artificial short peptides that can inhibit microbial growth. Beyond killing microbes, AMPs at grow sub-inhibitory concentrations also exhibit anti-virulence activity against critical pathogenic bacteria, including ESKAPE pathogens. Anti-virulence therapies are an alternative to antibiotics since they do not directly affect viability and growth, and they are considered less likely to generate resistance. Bacterial biofilms significantly increase antibiotic resistance and are linked to establishing chronic infections. Various AMPs can kill biofilm cells and eradicate infections in animal models. However, some can inhibit biofilm formation and promote dispersal at sub-growth inhibitory concentrations. These examples are discussed here, along with those of peptides that inhibit the expression of traits controlled by quorum sensing, such as the production of exoproteases, phenazines, surfactants, toxins, among others. In addition, specific targets that are determinants of virulence include secretion systems (type II, III, and VI) responsible for releasing effector proteins toxic to eukaryotic cells. This review summarizes the current knowledge on the anti-virulence properties of AMPs and the future directions of their research.
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Affiliation(s)
- Israel Castillo-Juárez
- Laboratorio de Fitoquímica, Posgrado de Botánica, Colegio de Postgraduados, Texcoco, Estado de México, Mexico
| | - Blanca Esther Blancas-Luciano
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico City, Mexico
| | - Rodolfo García-Contreras
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico City, Mexico
| | - Ana María Fernández-Presas
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico City, Mexico
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5
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Dittrich PS, Nuti N, Rottmann P, Stucki A, Koch P, Panke S. A Multiplexed Cell‐Free Assay to Screen for Antimicrobial Peptides in Double Emulsion Droplets. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202114632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Petra S Dittrich
- Eidgenossische Technische Hochschule Zurich Biosystems and Engineering Mattenstrasse 26 4058 Basel SWITZERLAND
| | - Nicola Nuti
- ETH Zurich: Eidgenossische Technische Hochschule Zurich Biosystems Science and Engineering SWITZERLAND
| | - Philipp Rottmann
- ETH Zurich: Eidgenossische Technische Hochschule Zurich Biosystems Science and Engineering SWITZERLAND
| | - Ariane Stucki
- ETH Zurich: Eidgenossische Technische Hochschule Zurich Biosystems Science and Engineering SWITZERLAND
| | - Philipp Koch
- ETH Zurich: Eidgenossische Technische Hochschule Zurich Biosystems Science and Engineering SWITZERLAND
| | - Sven Panke
- ETH Zurich: Eidgenossische Technische Hochschule Zurich Biosysystems Science and Engineering SWITZERLAND
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6
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Initial purification of antimicrobial fermentation metabolites from Paecilomyces cicadae and its antimicrobial mechanism. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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7
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Sinha S, Ng WJ, Bhattacharjya S. NMR structure and localization of the host defense antimicrobial peptide thanatin in zwitterionic dodecylphosphocholine micelle: Implications in antimicrobial activity. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183432. [PMID: 32781154 DOI: 10.1016/j.bbamem.2020.183432] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 07/11/2020] [Accepted: 07/24/2020] [Indexed: 02/07/2023]
Abstract
Antimicrobial peptides (AMPs) are potentially vital as the next generation of antibiotics against multidrug resistant bacterial pathogens. Thanatin, an insect derived pathogen inducible 21-residue long antimicrobial peptide, demonstrates antimicrobial activity toward broad range of pathogens. Thanatin is an excellent candidate for antibiotics development due to potent in vivo activity in animal model and low toxicity to human cells. Recent studies indicated mode of action of thanatin could be intriguing and may comprise bacterial membrane permeabilization and interactions with periplasmic proteins. In order to better understand selectivity and membrane disruption, here, we determined 3-D structure of the thanatin in zwitterionic DPC-d38 micelle by NMR spectroscopy. The depth of insertion of thanatin into micelle structure was investigated by spin labelled doxyl lipids, 5-DSA and 16-DSA. DPC-bound structure of thanatin is defined by a β-hairpin structure and an extended and turn conformations, for residues G1-I8, at the N-terminus. The β-hairpin structure is delineated by two antiparallel β-strands, residues I9-C11 and residues K17-R20, which is connected by loop consisted of residues N12-G16. There are cross β-strands sidechain-sidechain packing interactions among hydrophobic and aromatic residues. Spin labelled lipid studies revealed a set of spatially proximal residues V6, I8, Q19, R20 and M21 may be deeply inserted into the hydrophobic core of the DPC micelle. While, residues including those at the turn/loop are merely surface localized. The atomic resolution structure and orientation of thanatin in zwitterionic DPC micelle may be utilized for understating mode of action in lipid membrane and further development of non-toxic analogs.
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Affiliation(s)
- Sheetal Sinha
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore; Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Wun Jern Ng
- Environmental Bio-Innovation Group (EBiG), School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Surajit Bhattacharjya
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore.
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8
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Pan Y, Zheng LB, Mao Y, Wang J, Lin LS, Su YQ, Li Y. The antibacterial activity and mechanism analysis of piscidin 5 like from Larimichthys crocea. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2019; 92:43-49. [PMID: 30359623 DOI: 10.1016/j.dci.2018.10.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 10/21/2018] [Accepted: 10/21/2018] [Indexed: 06/08/2023]
Abstract
Chemical drugs, such as antibiotics, were still important materials to prevent and cure diseases of aquatic organisms. However, antibiotics abuse do not only make the effects little, but also cause other bad problems, such as bacterial resistance and drug residues. Therefore, seeking the effective substitutes of antibiotics was an approach needed to be explored. Antibacterial peptides (AMPs) attracted more and more attention in the recent years. The parasitism and secondary bacterial invasion caused by ectroparasite Cryptocaryon irritans was a disaster to almost all host fish, including Larimichthys crocea. Reports indicated many AMPs played a key role in the whole parasitic infection cycle. Piscidin 5 like was a member of piscidin family. In the study, the antibacterial activity and mechanisms of piscidin 5 like from L.coreca (Lc-P5L) were detected. Liquid growth inhibition results showed recombinant Lc-P5L (rLc-P5L) had broad antibacterial spectrum and strong bactericidal activity. The bactericidal activity functioned in dose- and time-dependent manners. SEM (scanning electron microscope) observed the relatively detailed bactericidal process, rLc-P5L treatment resulted in a mass of bacteria piling together, appearing plenty of strange filaments and covering on the bacteria. Besides, S.aureus overgrowed plenty of granules, formed holes on the membrane of a few cells, and contents poured out from the holes. At the same time, antibacterial mechanisms were explored. After direct incubation with bacteria, western blot detected the apparently positive signal of rLc-P5L on bacteria; secondly, the incubation first with LPS (lipopolysaccharide) or LTA (lipoteichoic acid) significantly affect the binding of rLc-P5L to bacteria again, which indicated rLc-P5L could bind to bacteria through interaction with some PAMPs (pathogen-associated molecular patterns). In addition, rLc-P5L could interact with bacterial genome DNA by dose- and time-dependent means. In summary, rLc-P5L binded to bacteria surface through targeting to some PAMPs to damage membrane, and entered into cells to interact with genome DNA to disturb normal metabolism when it reached to some certain time and concentration thresholds, which were likely to be its pathway to exert antibacterial activity.
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Affiliation(s)
- Ying Pan
- State Key Laboratory of Marine Environmental Science, Xiamen University, 361005, China
| | - Li-Bing Zheng
- State Key Laboratory of Marine Environmental Science, Xiamen University, 361005, China.
| | - Yong Mao
- State Key Laboratory of Marine Environmental Science, Xiamen University, 361005, China
| | - Jun Wang
- State Key Laboratory of Marine Environmental Science, Xiamen University, 361005, China
| | - Long-Shan Lin
- Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China
| | - Yong-Quan Su
- State Key Laboratory of Marine Environmental Science, Xiamen University, 361005, China
| | - Yuan Li
- Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China.
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9
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Haney EF, Straus SK, Hancock REW. Reassessing the Host Defense Peptide Landscape. Front Chem 2019; 7:43. [PMID: 30778385 PMCID: PMC6369191 DOI: 10.3389/fchem.2019.00043] [Citation(s) in RCA: 216] [Impact Index Per Article: 43.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 01/15/2019] [Indexed: 12/18/2022] Open
Abstract
Current research has demonstrated that small cationic amphipathic peptides have strong potential not only as antimicrobials, but also as antibiofilm agents, immune modulators, and anti-inflammatories. Although traditionally termed antimicrobial peptides (AMPs) these additional roles have prompted a shift in terminology to use the broader term host defense peptides (HDPs) to capture the multi-functional nature of these molecules. In this review, we critically examined the role of AMPs and HDPs in infectious diseases and inflammation. It is generally accepted that HDPs are multi-faceted mediators of a wide range of biological processes, with individual activities dependent on their polypeptide sequence. In this context, we explore the concept of chemical space as it applies to HDPs and hypothesize that the various functions and activities of this class of molecule exist on independent but overlapping activity landscapes. Finally, we outline several emerging functions and roles of HDPs and highlight how an improved understanding of these processes can potentially be leveraged to more fully realize the therapeutic promise of HDPs.
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Affiliation(s)
- Evan F Haney
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada
| | - Suzana K Straus
- Department of Chemistry, University of British Columbia, Vancouver, BC, Canada
| | - Robert E W Hancock
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada
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10
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Luppi L, Babut T, Petit E, Rolland M, Quemener D, Soussan L, Moradi MA, Semsarilar M. Antimicrobial polylysine decorated nano-structures prepared through polymerization induced self-assembly (PISA). Polym Chem 2019. [DOI: 10.1039/c8py01351a] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Polylysine decorated diblock copolymer nano-objects are prepared by polymerization-induced self-assemblyviaRAFT dispersion polymerization of 2-hydroxypropyl methacrylate. Antimicrobial properties of the resulting nano-objects evaluated using a gram positive bacteria.
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Affiliation(s)
- L. Luppi
- Institut Européen des Membranes
- IEM
- UMR 5635
- University of Montpellier
- ENSCM
| | - T. Babut
- Institut Européen des Membranes
- IEM
- UMR 5635
- University of Montpellier
- ENSCM
| | - E. Petit
- Institut Européen des Membranes
- IEM
- UMR 5635
- University of Montpellier
- ENSCM
| | - M. Rolland
- Institut Européen des Membranes
- IEM
- UMR 5635
- University of Montpellier
- ENSCM
| | - D. Quemener
- Institut Européen des Membranes
- IEM
- UMR 5635
- University of Montpellier
- ENSCM
| | - L. Soussan
- Institut Européen des Membranes
- IEM
- UMR 5635
- University of Montpellier
- ENSCM
| | - M. A. Moradi
- Laboratory of Materials and Interface Chemistry and Centre for Multiscale Electron Microscopy
- Department of Chemical Engineering and Chemistry
- Eindhoven University of Technology
- Eindhoven
- The Netherlands
| | - M. Semsarilar
- Institut Européen des Membranes
- IEM
- UMR 5635
- University of Montpellier
- ENSCM
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11
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Yang Z, Weisshaar JC. HaloTag Assay Suggests Common Mechanism of E. coli Membrane Permeabilization Induced by Cationic Peptides. ACS Chem Biol 2018; 13:2161-2169. [PMID: 29812894 DOI: 10.1021/acschembio.8b00336] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Permeabilization of the Gram-negative bacterial outer membrane (OM) by antimicrobial peptides (AMPs) is the initial step enabling access of the AMP to the cytoplasmic membrane. We present a new single-cell, time-resolved fluorescence microscopy assay that reports on the permeabilization of the E. coli OM to small molecules with a time resolution of 3 s or better. When profluorophore JF646 (702 Da) crosses the outer membrane (OM) and gains access to the periplasm, it binds to the localized HaloTag protein (34 kDa) and fluoresces in a characteristic hollow spatial pattern. Previous work used the much larger periplasmic GFP (27 kDa) probe, which reports on OM permeabilization to globular proteins. We test the assay on three cationic agents: Gellman random β-peptide copolymer MM63:CHx37, human AMP LL-37, and synthetic hybrid AMP CM15. These results combined with the previous work suggest a unifying sequence of OM and cytoplasmic membrane (CM) events that may prove commonplace in the attack of cationic peptides on Gram-negative bacteria. The peptide initially induces gradual OM permeabilization to small molecules, likely including the peptide itself. After a lag time, abrupt permeabilization of the OM, abrupt resealing of the OM, and abrupt permeabilization of the CM (all to globular proteins) occur in rapid sequence. We propose a mechanism based on membrane curvature stress induced by the time-dependent differential binding of peptide to the outer leaflet of the OM and CM. The results provide fresh insight into the critical OM-permeabilization step leading to a variety of damaging downstream events.
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Affiliation(s)
- Zhilin Yang
- Department of Chemistry and Molecular Biophysics Program University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - James C. Weisshaar
- Department of Chemistry and Molecular Biophysics Program University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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12
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Kumar P, Takayesu A, Abbasi U, Kalathottukaren MT, Abbina S, Kizhakkedathu JN, Straus SK. Antimicrobial Peptide-Polymer Conjugates with High Activity: Influence of Polymer Molecular Weight and Peptide Sequence on Antimicrobial Activity, Proteolysis, and Biocompatibility. ACS APPLIED MATERIALS & INTERFACES 2017; 9:37575-37586. [PMID: 29019386 DOI: 10.1021/acsami.7b09471] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We report the synthesis, characterization, activity, and biocompatibility of a novel series of antimicrobial peptide-polymer conjugates. Using parent peptide aurein 2.2, we designed a peptide array (∼100 peptides) with single and multiple W and R mutations and identified antimicrobial peptides (AMPs) with potent activity against Staphylococcus aureus (S. aureus). These novel AMPs were conjugated to hyperbranched polyglycerols (HPGs) of different molecular weights and number of peptides to improve their antimicrobial activity and toxicity. The cell and blood compatibility studies of these conjugates demonstrated better properties than those of the AMP alone. However, conjugates showed lower antimicrobial activity in comparison to that of peptides, as determined from minimal inhibition concentrations (MICs) against S. aureus, but considerably better than that of the available polymer-AMP conjugates in the literature. In addition to measuring MICs and characterizing the biocompatibility, circular dichroism spectroscopy was used to investigate the interaction of the novel conjugates with model bacterial biomembranes. Moreover, the novel conjugates were exposed to trypsin to evaluate their stability. It was found that the conjugates resist proteolysis in comparison with unprotected peptides. The peptide conjugates were active in serum and whole blood. Overall, the results show that combining a highly active AMP and low-molecular-weight HPG yields bioconjugates with excellent biocompatibility, MICs below 100 μg/mL, and proteolytic stability, which could potentially improve its utility for in vivo applications.
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Affiliation(s)
- Prashant Kumar
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
- Centre for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia , 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC, Canada V6T 1Z3
| | - Allen Takayesu
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
| | - Usama Abbasi
- Centre for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia , 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC, Canada V6T 1Z3
| | - Manu Thomas Kalathottukaren
- Centre for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia , 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC, Canada V6T 1Z3
| | - Srinivas Abbina
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
- Centre for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia , 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC, Canada V6T 1Z3
| | - Jayachandran N Kizhakkedathu
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
- Centre for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia , 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC, Canada V6T 1Z3
| | - Suzana K Straus
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
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13
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Lam SJ, Wong EHH, O'Brien-Simpson NM, Pantarat N, Blencowe A, Reynolds EC, Qiao GG. Bionano Interaction Study on Antimicrobial Star-Shaped Peptide Polymer Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2016; 8:33446-33456. [PMID: 27960388 DOI: 10.1021/acsami.6b11402] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
'Structurally nanoengineered antimicrobial peptide polymers' (SNAPPs), in the form of star-shaped peptide polymer nanoparticles, have been recently demonstrated as a new class of antimicrobial agents with superior in vitro and in vivo efficacy against Gram-negative pathogens, including multidrug-resistant species. Herein, we present a detailed bionano interaction study on SNAPPs by assessing their antimicrobial activities against several Gram-negative bacteria in complex biological matrices. Simulated body fluid and animal serum were used as test media to reveal factors that influence the antimicrobial efficacy of SNAPPs. With the exception of Acinetobacter baumannii, the presence of divalent cations at physiological concentrations reduced the antimicrobial efficacy of SNAPPs from minimum inhibitory concentrations (MICs) within the nanomolar range (40-300 nM) against Escherichia coli, Pseudomanas aeruginosa, and Klebsiella pneumoniae to 0.6-4.7 μM. By using E. coli as a representative bacterial species, we demonstrated that the reduction in activity was due to a decrease in the ability of SNAPPs to cause outer and inner membrane disruption. This effect could be reversed through coadministration with a chelating agent. Interestingly, the potency of SNAPPs against A. baumannii was retained even under high salt concentrations. The presence of serum proteins was also found to affect the interaction of SNAPPs with bacterial membranes, possibly through intermolecular binding. Collectively, this study highlights the need to consider the possible interactions of (bio)molecules present in vivo with any new antimicrobial agent under development. We also demonstrate that outer membrane disruption/destabilization is an important but hitherto under-recognized target for the antimicrobial action of peptide-based agents, such as antimicrobial peptides (AMPs). Overall, the findings presented herein could aid in the design of more efficient peptide-based antimicrobial agents with uncompromised potency even under physiological conditions.
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Affiliation(s)
- Shu J Lam
- Polymer Science Group, Department of Chemical & Biomolecular Engineering, and ‡Melbourne Dental School and The Bio21 Institute of Molecular Science and Biotechnology, Oral Health CRC, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Edgar H H Wong
- Polymer Science Group, Department of Chemical & Biomolecular Engineering, and ‡Melbourne Dental School and The Bio21 Institute of Molecular Science and Biotechnology, Oral Health CRC, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Neil M O'Brien-Simpson
- Polymer Science Group, Department of Chemical & Biomolecular Engineering, and ‡Melbourne Dental School and The Bio21 Institute of Molecular Science and Biotechnology, Oral Health CRC, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Namfon Pantarat
- Polymer Science Group, Department of Chemical & Biomolecular Engineering, and ‡Melbourne Dental School and The Bio21 Institute of Molecular Science and Biotechnology, Oral Health CRC, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Anton Blencowe
- Polymer Science Group, Department of Chemical & Biomolecular Engineering, and ‡Melbourne Dental School and The Bio21 Institute of Molecular Science and Biotechnology, Oral Health CRC, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Eric C Reynolds
- Polymer Science Group, Department of Chemical & Biomolecular Engineering, and ‡Melbourne Dental School and The Bio21 Institute of Molecular Science and Biotechnology, Oral Health CRC, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Greg G Qiao
- Polymer Science Group, Department of Chemical & Biomolecular Engineering, and ‡Melbourne Dental School and The Bio21 Institute of Molecular Science and Biotechnology, Oral Health CRC, The University of Melbourne , Parkville, Victoria 3010, Australia
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14
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Ahn M, Gunasekaran P, Rajasekaran G, Kim EY, Lee SJ, Bang G, Cho K, Hyun JK, Lee HJ, Jeon YH, Kim NH, Ryu EK, Shin SY, Bang JK. Pyrazole derived ultra-short antimicrobial peptidomimetics with potent anti-biofilm activity. Eur J Med Chem 2016; 125:551-564. [PMID: 27718471 DOI: 10.1016/j.ejmech.2016.09.071] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/20/2016] [Accepted: 09/21/2016] [Indexed: 12/18/2022]
Abstract
In this study, we report on the first chemical synthesis of ultra-short pyrazole-arginine based antimicrobial peptidomimetics derived from the newly synthesized N-alkyl/aryl pyrazole amino acids. Through the systematic tuning of hydrophobicity, charge, and peptide length, we identified the shortest peptide Py11 with the most potent antimicrobial activity. Py11 displayed greater antimicrobial activity against antibiotic-resistant bacteria, including MRSA, MDRPA, and VREF, which was approximately 2-4 times higher than that of melittin. Besides its higher selectivity (therapeutic index) toward bacterial cells than LL-37, Py11 showed highly increased proteolytic stability against trypsin digestion and maintained its antimicrobial activity in the presence of physiological salts. Interestingly, Py11 exhibited higher anti-biofilm activity against MDRPA compared to LL-37. The results from fluorescence spectroscopy and transmission electron microscopy (TEM) suggested that Py11 kills bacterial cells possibly by integrity disruption damaging the cell membrane, leading to the cytosol leakage and eventual cell lysis. Furthermore, Py11 displayed significant anti-inflammatory (endotoxin-neutralizing) activity by inhibiting LPS-induced production of nitric oxide (NO) and TNF-α. Collectively, our results suggest that Py11 may serve as a model compound for the design of antimicrobial and antisepsis agents.
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Affiliation(s)
- Mija Ahn
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea
| | - Pethaiah Gunasekaran
- Molecular Embryology Laboratory, Department of Animal Sciences, Chungbuk National University, Chung-Buk, 361-763, Republic of Korea
| | - Ganesan Rajasekaran
- Department of Medical Science, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, 501-759, Republic of Korea
| | - Eun Young Kim
- Department of Medical Science, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, 501-759, Republic of Korea
| | - Soo-Jae Lee
- College of Pharmacy, Chungbuk National University, Chungbuk, 361-763, Republic of Korea
| | - Geul Bang
- Biomedical Omics Group, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea
| | - Kun Cho
- Biomedical Omics Group, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea
| | - Jae-Kyung Hyun
- Division of Electron Microscopic Research, Korea Basic Science Institute, 113 Gwahakro, Daejeon, 305-333, Republic of Korea
| | - Hyun-Ju Lee
- Division of Electron Microscopic Research, Korea Basic Science Institute, 113 Gwahakro, Daejeon, 305-333, Republic of Korea; Department of Chemistry, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Young Ho Jeon
- College of Pharmacy, Korea University, 2511 Sejong-Ro, Sejong, 30019, Republic of Korea
| | - Nam-Hyung Kim
- Molecular Embryology Laboratory, Department of Animal Sciences, Chungbuk National University, Chung-Buk, 361-763, Republic of Korea
| | - Eun Kyoung Ryu
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea; Department of Bio-analytical Science, University of Science & Technology, Daejeon, 34113, Republic of Korea
| | - Song Yub Shin
- Department of Medical Science, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, 501-759, Republic of Korea.
| | - Jeong Kyu Bang
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea; Department of Bio-analytical Science, University of Science & Technology, Daejeon, 34113, Republic of Korea.
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15
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Dahlgren C, Gabl M, Holdfeldt A, Winther M, Forsman H. Basic characteristics of the neutrophil receptors that recognize formylated peptides, a danger-associated molecular pattern generated by bacteria and mitochondria. Biochem Pharmacol 2016; 114:22-39. [DOI: 10.1016/j.bcp.2016.04.014] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 04/26/2016] [Indexed: 12/20/2022]
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16
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Mohanram H, Bhattacharjya S. Salt-resistant short antimicrobial peptides. Biopolymers 2016; 106:345-56. [DOI: 10.1002/bip.22819] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 01/26/2016] [Accepted: 02/01/2016] [Indexed: 01/01/2023]
Affiliation(s)
- Harini Mohanram
- School of Biological Sciences; Nanyang Technological University; 60 Nanyang Drive Singapore 637551
| | - Surajit Bhattacharjya
- School of Biological Sciences; Nanyang Technological University; 60 Nanyang Drive Singapore 637551
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17
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The human cathelicidin LL-37 — A pore-forming antibacterial peptide and host-cell modulator. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:546-66. [DOI: 10.1016/j.bbamem.2015.11.003] [Citation(s) in RCA: 206] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 10/30/2015] [Accepted: 11/05/2015] [Indexed: 01/12/2023]
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18
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Choi H, Chakraborty S, Liu R, Gellman SH, Weisshaar JC. Single-Cell, Time-Resolved Antimicrobial Effects of a Highly Cationic, Random Nylon-3 Copolymer on Live Escherichia coli. ACS Chem Biol 2016; 11:113-20. [PMID: 26493221 DOI: 10.1021/acschembio.5b00547] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Synthetic random copolymers based on the nylon-3 (β-peptide) backbone show promise as inexpensive antimicrobial agents resistant to proteolysis. We present a time-resolved observational study of the attack of a particular copolymer MM63:CHx37 on single, live Escherichia coli cells. The composition and chain length of MM63:CHx37 (63% cationic subunits, 37% hydrophobic subunits, 35-subunit average length) were optimized to enhance antibacterial activity while minimizing lysis of human red blood cells. For E. coli cells that export GFP to the periplasm, we obtain alternating phase-contrast and green fluorescence images with a time resolution of 12 s over 60 min following initiation of copolymer flow. Within seconds, cells shrink and exhibit the same plasmolysis spaces that occur following abrupt external osmotic upshift. The osmoprotection machinery attempts to replenish cytoplasmic water, but recovery is interrupted by permeabilization of the cytoplasmic membrane (CM) to GFP. Evidently, the highly cationic copolymer and its counterions rapidly translocate across the outer membrane without permeabilizing it to GFP. The CM permeabilization event is spatially localized. Cells whose CM has been permeabilized never recover growth. The minimum inhibitory concentration (MIC) for cells lacking the osmolyte importer ProP is 4-fold smaller than for normal cells, suggesting that osmoprotection is an important survival strategy. In addition, at the time of CM permeabilization, we observe evidence of oxidative stress. The MIC under anaerobic conditions is at least 8-fold larger than under aerobic conditions, further implicating oxidative damage as an important bacteriostatic effect. Once the copolymer reaches the periplasm, multiple growth-halting mechanisms proceed in parallel.
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Affiliation(s)
- Heejun Choi
- Department of Chemistry and ‡Molecular Biophysics
Program, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Saswata Chakraborty
- Department of Chemistry and ‡Molecular Biophysics
Program, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Runhui Liu
- Department of Chemistry and ‡Molecular Biophysics
Program, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Samuel H. Gellman
- Department of Chemistry and ‡Molecular Biophysics
Program, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - James C. Weisshaar
- Department of Chemistry and ‡Molecular Biophysics
Program, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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19
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Barns KJ, Weisshaar JC. Single-cell, time-resolved study of the effects of the antimicrobial peptide alamethicin on Bacillus subtilis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:725-32. [PMID: 26777771 DOI: 10.1016/j.bbamem.2016.01.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 01/05/2016] [Accepted: 01/07/2016] [Indexed: 12/14/2022]
Abstract
Alamethicin is a well-studied antimicrobial peptide (AMP) that kills Gram-positive bacteria. It forms narrow, barrel-stave pores in planar lipid bilayers. We present a detailed, time-resolved microscopy study of the sequence of events during the attack of alamethicin on individual, live Bacillus subtilis cells expressing GFP in the cytoplasm. At the minimum inhibitory concentration (MIC), the first observed symptom is the halting of growth, as judged by the plateau in measured cell length vs time. The data strongly suggest that this growth-halting event occurs prior to membrane permeabilization. Gradual degradation of the proton-motive force, inferred from a decrease in pH-dependent GFP fluorescence intensity, evidently begins minutes later and continues over about 5 min. There follows an abrupt permeabilization of the cytoplasmic membrane to the DNA stain Sytox Orange and concomitant loss of small osmolytes, causing observable cell shrinkage, presumably due to decreased turgor pressure. This permeabilization of the cytoplasmic membrane occurs uniformly across the entire membrane, not locally, on a timescale of 5s or less. GFP gradually leaks out of the cell envelope, evidently impeded by the shrunken peptidoglycan layer. Disruption of the cell envelope by alamethicin occurs in stages, with larger and larger species permeating the envelope as time evolves over tens of minutes. Some of the observed symptoms are consistent with the formation of barrel-stave pores, but the data do not rule out "chaotic pore" or "carpet" mechanisms. We contrast the effects of alamethicin and the human cathelicidin LL-37 on B. subtilis.
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Affiliation(s)
- Kenneth J Barns
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA
| | - James C Weisshaar
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA; Molecular Biophysics Program, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA.
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20
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de Gier MG, Bauke Albada H, Josten M, Willems R, Leavis H, van Mansveld R, Paganelli FL, Dekker B, Lammers JWJ, Sahl HG, Metzler-Nolte N. Synergistic activity of a short lipidated antimicrobial peptide (lipoAMP) and colistin or tobramycin against Pseudomonas aeruginosa from cystic fibrosis patients. MEDCHEMCOMM 2016. [DOI: 10.1039/c5md00373c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synergistic effects between a lipoAMP and colistin against clinical P. aeruginosa strains isolated from cystic fibrosis patients are described.
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21
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Falcao CB, Pérez-Peinado C, de la Torre BG, Mayol X, Zamora-Carreras H, Jiménez MÁ, Rádis-Baptista G, Andreu D. Structural Dissection of Crotalicidin, a Rattlesnake Venom Cathelicidin, Retrieves a Fragment with Antimicrobial and Antitumor Activity. J Med Chem 2015; 58:8553-63. [PMID: 26465972 DOI: 10.1021/acs.jmedchem.5b01142] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In silico dissection of crotalicidin (Ctn), a cathelicidin from a South American pit viper, yielded fragments Ctn[1-14] and Ctn[15-34], which were tested to ascertain to what extent they reproduced the structure and activity of the parent peptide. NMR data showing Ctn to be α-helical at the N-terminus and unstructured at the C-terminus were matched by similar data from the fragments. The peptides were tested against Gram-positive and -negative bacteria and for toxicity against both tumor and healthy cells. Despite its amphipathic α-helical structure, Ctn[1-14] was totally inert toward bacteria or eukaryotic cells. In contrast, unstructured Ctn[15-34] replicated the activity of parent Ctn against Gram-negative bacteria and tumor cells while being significantly less toxic toward eukaryotic cells. This selectivity for bacteria and tumor cells, plus a stability to serum well above that of Ctn, portrays Ctn[15-34] as an appealing candidate for further development as an anti-infective or antitumor lead.
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Affiliation(s)
- Claudio Borges Falcao
- Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra , 08003 Barcelona, Spain.,Laboratory of Biochemistry and Biotechnology, Institute for Marine Sciences, Federal University of Ceará , 60455-760 Fortaleza, CE, Brazil
| | - Clara Pérez-Peinado
- Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra , 08003 Barcelona, Spain
| | - Beatriz G de la Torre
- Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra , 08003 Barcelona, Spain
| | - Xavier Mayol
- Programa de Recerca en Càncer, Institut Hospital del Mar d'Investigacions Mèdiques , 08003 Barcelona, Spain
| | - Héctor Zamora-Carreras
- Instituto de Química Física "Rocasolano", Consejo Superior de Investigaciones Científicas (CSIC), 28006 Madrid, Spain
| | - M Ángeles Jiménez
- Instituto de Química Física "Rocasolano", Consejo Superior de Investigaciones Científicas (CSIC), 28006 Madrid, Spain
| | - Gandhi Rádis-Baptista
- Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra , 08003 Barcelona, Spain.,Laboratory of Biochemistry and Biotechnology, Institute for Marine Sciences, Federal University of Ceará , 60455-760 Fortaleza, CE, Brazil
| | - David Andreu
- Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra , 08003 Barcelona, Spain
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22
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Structure and membrane interactions of chionodracine, a piscidin-like antimicrobial peptide from the icefish Chionodraco hamatus. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:1285-93. [DOI: 10.1016/j.bbamem.2015.02.030] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 02/23/2015] [Accepted: 02/27/2015] [Indexed: 12/24/2022]
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23
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Kumar P, Shenoi RA, Lai BFL, Nguyen M, Kizhakkedathu JN, Straus SK. Conjugation of Aurein 2.2 to HPG Yields an Antimicrobial with Better Properties. Biomacromolecules 2015; 16:913-23. [DOI: 10.1021/bm5018244] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Prashant Kumar
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Rajesh A. Shenoi
- Centre
for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia, 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC V6T 1Z3, Canada
| | - Benjamin F. L. Lai
- Centre
for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia, 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC V6T 1Z3, Canada
| | - Michael Nguyen
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Jayachandran N. Kizhakkedathu
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
- Centre
for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia, 2350 Health Sciences Mall, Life Sciences Centre, Vancouver, BC V6T 1Z3, Canada
| | - Suzana K. Straus
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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Single-cell, real-time detection of oxidative stress induced in Escherichia coli by the antimicrobial peptide CM15. Proc Natl Acad Sci U S A 2015; 112:E303-10. [PMID: 25561551 DOI: 10.1073/pnas.1417703112] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Antibiotics target specific biochemical mechanisms in bacteria. In response to new drugs, pathogenic bacteria rapidly develop resistance. In contrast, antimicrobial peptides (AMPs) have retained broad spectrum antibacterial potency over millions of years. We present single-cell fluorescence assays that detect reactive oxygen species (ROS) in the Escherichia coli cytoplasm in real time. Within 30 s of permeabilization of the cytoplasmic membrane by the cationic AMP CM15 [combining residues 1-7 of cecropin A (from moth) with residues 2-9 of melittin (bee venom)], three fluorescence signals report oxidative stress in the cytoplasm, apparently involving O2 (-), H2O2, and •OH. Mechanistic studies indicate that active respiration is a prerequisite to the CM15-induced oxidative damage. In anaerobic conditions, signals from ROS are greatly diminished and the minimum inhibitory concentration increases 20-fold. Evidently the natural human AMP LL-37 also induces a burst of ROS. Oxidative stress may prove a significant bacteriostatic mechanism for a variety of cationic AMPs. If so, host organisms may use the local oxygen level to modulate AMP potency.
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25
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Baumann S, Herrmann J, Raju R, Steinmetz H, Mohr KI, Hüttel S, Harmrolfs K, Stadler M, Müller R. Cystobactamids: myxobacterial topoisomerase inhibitors exhibiting potent antibacterial activity. Angew Chem Int Ed Engl 2014; 53:14605-9. [PMID: 25510965 DOI: 10.1002/anie.201409964] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 10/17/2014] [Indexed: 01/31/2023]
Abstract
The development of new antibiotics faces a severe crisis inter alia owing to a lack of innovative chemical scaffolds with activities against Gram-negative and multiresistant pathogens. Herein, we report highly potent novel antibacterial compounds, the myxobacteria-derived cystobactamids 1-3, which were isolated from Cystobacter sp. and show minimum inhibitory concentrations in the low μg mL(-1) range. We describe the isolation and structure elucidation of three congeners as well as the identification and annotation of their biosynthetic gene cluster. By studying the self-resistance mechanism in the natural producer organism, the molecular targets were identified as bacterial type IIa topoisomerases. As quinolones are largely exhausted as a template for new type II topoisomerase inhibitors, the cystobactamids offer exciting alternatives to generate novel antibiotics using medicinal chemistry and biosynthetic engineering.
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Affiliation(s)
- Sascha Baumann
- Abteilung Mikrobielle Naturstoffe, Helmholtz Institut für Pharmazeutische Forschung Saarland, Helmholtz Zentrum für Infektionsforschung, Universität des Saarlandes, Campus C2.3, 66123 Saarbrücken (Germany); Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover-Braunschweig (Germany)
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26
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Baumann S, Herrmann J, Raju R, Steinmetz H, Mohr KI, Hüttel S, Harmrolfs K, Stadler M, Müller R. Cystobactamide: Topoisomerase-Inhibitoren aus Myxobakterien mit hoher antibakterieller Aktivität. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409964] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Wang G, Hanke ML, Mishra B, Lushnikova T, Heim C, Chittezham Thomas V, Bayles KW, Kielian T. Transformation of human cathelicidin LL-37 into selective, stable, and potent antimicrobial compounds. ACS Chem Biol 2014; 9:1997-2002. [PMID: 25061850 PMCID: PMC4168778 DOI: 10.1021/cb500475y] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2014] [Accepted: 07/25/2014] [Indexed: 01/26/2023]
Abstract
This Letter reports a family of novel antimicrobial compounds obtained by combining peptide library screening with structure-based design. Library screening led to the identification of a human LL-37 peptide resistant to chymotrypsin. This d-amino-acid-containing peptide template was active against Escherichia coli but not methicillin-resistant Staphylococcus aureus (MRSA). It possesses a unique nonclassic amphipathic structure with hydrophobic defects. By repairing the hydrophobic defects, the peptide (17BIPHE2) gained activity against the ESKAPE pathogens, including Enterococcus faecium, S. aureus, Klebsiella pneumoniae, Acinetobacter baumanii, Pseudomonas aeruginosa, and Enterobacter species. In vitro, 17BIPHE2 could disrupt bacterial membranes and bind to DNA. In vivo, the peptide prevented staphylococcal biofilm formation in a mouse model of catheter-associated infection. Meanwhile, it boosted the innate immune response to further combat the infection. Because these peptides are potent, cell-selective, and stable to several proteases, they may be utilized to combat one or more ESKAPE pathogens.
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Affiliation(s)
- Guangshun Wang
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 986495 Nebraska Medical Center, Omaha, Nebraska 68198-6495, United States
| | - Mark L. Hanke
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Biswajit Mishra
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 986495 Nebraska Medical Center, Omaha, Nebraska 68198-6495, United States
| | - Tamara Lushnikova
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 986495 Nebraska Medical Center, Omaha, Nebraska 68198-6495, United States
| | - Cortney
E. Heim
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Vinai Chittezham Thomas
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Kenneth W. Bayles
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Tammy Kielian
- Department
of Pathology and Microbiology, University
of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
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28
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Charbonneau ME, Gonzalez-Hernandez MJ, Showalter HD, Donato NJ, Wobus CE, O’Riordan MXD. Small molecule deubiquitinase inhibitors promote macrophage anti-infective capacity. PLoS One 2014; 9:e104096. [PMID: 25093325 PMCID: PMC4122495 DOI: 10.1371/journal.pone.0104096] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 07/07/2014] [Indexed: 12/18/2022] Open
Abstract
The global spread of anti-microbial resistance requires urgent attention, and diverse alternative strategies have been suggested to address this public health concern. Host-directed immunomodulatory therapies represent one approach that could reduce selection for resistant bacterial strains. Recently, the small molecule deubiquitinase inhibitor WP1130 was reported as a potential anti-infective drug against important human food-borne pathogens, notably Listeria monocytogenes and noroviruses. Utilization of WP1130 itself is limited due to poor solubility, but given the potential of this new compound, we initiated an iterative rational design approach to synthesize new derivatives with increased solubility that retained anti-infective activity. Here, we test a small library of novel synthetic molecules based on the structure of the parent compound, WP1130, for anti-infective activity in vitro. Our studies identify a promising candidate, compound 9, which reduced intracellular growth of L. monocytogenes at concentrations that caused minimal cellular toxicity. Compound 9 itself had no bactericidal activity and only modestly slowed Listeria growth rate in liquid broth culture, suggesting that this drug acts as an anti-infective compound by modulating host-cell function. Moreover, this new compound also showed anti-infective activity against murine norovirus (MNV-1) and human norovirus, using the Norwalk virus replicon system. This small molecule inhibitor may provide a chemical platform for further development of therapeutic deubiquitinase inhibitors with broad-spectrum anti-infective activity.
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Affiliation(s)
- Marie-Eve Charbonneau
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Marta J. Gonzalez-Hernandez
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Hollis D. Showalter
- Vahlteich Medicinal Chemistry Core, Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Nicholas J. Donato
- Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Christiane E. Wobus
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Mary X. D. O’Riordan
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, United States of America
- * E-mail:
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