151
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Palmieri G, Balestrieri M, Proroga YT, Falcigno L, Facchiano A, Riccio A, Capuano F, Marrone R, Neglia G, Anastasio A. New antimicrobial peptides against foodborne pathogens: From in silico design to experimental evidence. Food Chem 2016; 211:546-54. [DOI: 10.1016/j.foodchem.2016.05.100] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 04/19/2016] [Accepted: 05/16/2016] [Indexed: 10/21/2022]
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152
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Miller WR, Bayer AS, Arias CA. Mechanism of Action and Resistance to Daptomycin in Staphylococcus aureus and Enterococci. Cold Spring Harb Perspect Med 2016; 6:cshperspect.a026997. [PMID: 27580748 DOI: 10.1101/cshperspect.a026997] [Citation(s) in RCA: 134] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Lipopeptides are natural product antibiotics that consist of a peptide core with a lipid tail with a diverse array of target organisms and mechanisms of action. Daptomycin (DAP) is an example of these compounds with specific activity against Gram-positive organisms. DAP has become increasingly important to combat infections caused by Gram-positive bacteria because of the presence of multidrug resistance in these organisms, particularly in methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE). However, emergence of resistance to DAP during therapy is a well-described phenomenon that threatens the clinical use of this antibiotic, limiting further the therapeutic options against both MRSA and VRE. This work will review the historical aspects of the development of DAP, as well as the current knowledge on its mechanism of action and pathways to resistance in a clinically relevant context.
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Affiliation(s)
- William R Miller
- University of Texas Medical School at Houston, Department of Internal Medicine, Division of Infectious Diseases, Houston, Texas 77030
| | - Arnold S Bayer
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, California 90502.,David Geffen School of Medicine at UCLA, Los Angeles, California 90095
| | - Cesar A Arias
- University of Texas Medical School at Houston, Department of Internal Medicine, Division of Infectious Diseases, Houston, Texas 77030.,Department of Microbiology and Molecular Genetics, Houston, Texas 77030.,Molecular Genetics and Antimicrobial Resistance Unit, Universidad El Bosque, Bogota, Colombia.,International Center for Microbial Genomics, Universidad El Bosque, Bogota, Colombia
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153
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Daptomycin inhibits cell envelope synthesis by interfering with fluid membrane microdomains. Proc Natl Acad Sci U S A 2016; 113:E7077-E7086. [PMID: 27791134 DOI: 10.1073/pnas.1611173113] [Citation(s) in RCA: 269] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Daptomycin is a highly efficient last-resort antibiotic that targets the bacterial cell membrane. Despite its clinical importance, the exact mechanism by which daptomycin kills bacteria is not fully understood. Different experiments have led to different models, including (i) blockage of cell wall synthesis, (ii) membrane pore formation, and (iii) the generation of altered membrane curvature leading to aberrant recruitment of proteins. To determine which model is correct, we carried out a comprehensive mode-of-action study using the model organism Bacillus subtilis and different assays, including proteomics, ionomics, and fluorescence light microscopy. We found that daptomycin causes a gradual decrease in membrane potential but does not form discrete membrane pores. Although we found no evidence for altered membrane curvature, we confirmed that daptomycin inhibits cell wall synthesis. Interestingly, using different fluorescent lipid probes, we showed that binding of daptomycin led to a drastic rearrangement of fluid lipid domains, affecting overall membrane fluidity. Importantly, these changes resulted in the rapid detachment of the membrane-associated lipid II synthase MurG and the phospholipid synthase PlsX. Both proteins preferentially colocalize with fluid membrane microdomains. Delocalization of these proteins presumably is a key reason why daptomycin blocks cell wall synthesis. Finally, clustering of fluid lipids by daptomycin likely causes hydrophobic mismatches between fluid and more rigid membrane areas. This mismatch can facilitate proton leakage and may explain the gradual membrane depolarization observed with daptomycin. Targeting of fluid lipid domains has not been described before for antibiotics and adds another dimension to our understanding of membrane-active antibiotics.
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154
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Abstract
Daptomycin is a lipopeptide antibiotic approved for use against Gram-positive organisms, including highly resistant species. A number of studies have suggested that daptomycin kills bacteria by membrane permeabilization and depolarization. Recently a model membrane system consisting of 1,2-dimyristoyl-sn-glycero-3-phosphocholine and 1,2-dimyristoyl-sn-glycero-3-phospho-(1'-rac-glycerol) in a 1:1 ratio and the ionophore CCCP was proposed as a simple model to investigate the mode of action of daptomycin and resistance mechanisms at a molecular level. This study investigates how this model depends on the composition of the membrane and the role of CCCP. Results obtained from a fluorescence assay using pyranine show that daptomycin causes leakage in liposomes of limited stability and that CCCP promotes this leakage. A different model membrane system used here, which relies on ion selective dyes such as 4,4'-[1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diylbis(5-methoxy-6,2-benzofurandiyl)]bis-, tetrakis[(acetyloxy)methyl] ester (PBFI), and 4,4'-[1,4,10-trioxa-7,13-diazacyclopentadecane-7,13-diylbis(5-methoxy-6,2-benzofurandiyl)]bis-, tetraammonium salt (SBFI), is a more robust alternative. Findings based on this newer model suggest that daptomycin is selective for potassium.
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Key Words
- 1,3-benzenedicarboxylic acid
- 4,4′-[1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diylbis(5-methoxy-6,2-benzofurandiyl)]bis-, tetrakis[(acetyloxy)methyl] ester (PBFI)
- 4,4′-[1,4,10-trioxa-7,13-diazacyclopentadecane-7,13-diylbis(5-methoxy-6,2-benzofurandiyl)]bis-, tetraammonium salt (SBFI)
- carbonyl cyanide m-chlorophenyl hydrazine (CCCP)
- daptomycin
- fluorescence
- leakage
- lipopeptide
- membrane depolarization
- pyranine
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Affiliation(s)
- Jin Zhang
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - Kyle Scoten
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - Suzana K. Straus
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
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155
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Malanovic N, Lohner K. Antimicrobial Peptides Targeting Gram-Positive Bacteria. Pharmaceuticals (Basel) 2016; 9:E59. [PMID: 27657092 PMCID: PMC5039512 DOI: 10.3390/ph9030059] [Citation(s) in RCA: 219] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 09/07/2016] [Accepted: 09/13/2016] [Indexed: 01/01/2023] Open
Abstract
Antimicrobial peptides (AMPs) have remarkably different structures as well as biological activity profiles, whereupon most of these peptides are supposed to kill bacteria via membrane damage. In order to understand their molecular mechanism and target cell specificity for Gram-positive bacteria, it is essential to consider the architecture of their cell envelopes. Before AMPs can interact with the cytoplasmic membrane of Gram-positive bacteria, they have to traverse the cell wall composed of wall- and lipoteichoic acids and peptidoglycan. While interaction of AMPs with peptidoglycan might rather facilitate penetration, interaction with anionic teichoic acids may act as either a trap for AMPs or a ladder for a route to the cytoplasmic membrane. Interaction with the cytoplasmic membrane frequently leads to lipid segregation affecting membrane domain organization, which affects membrane permeability, inhibits cell division processes or leads to delocalization of essential peripheral membrane proteins. Further, precursors of cell wall components, especially the highly conserved lipid II, are directly targeted by AMPs. Thereby, the peptides do not inhibit peptidoglycan synthesis via binding to proteins like common antibiotics, but form a complex with the precursor molecule, which in addition can promote pore formation and membrane disruption. Thus, the multifaceted mode of actions will make AMPs superior to antibiotics that act only on one specific target.
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Affiliation(s)
- Nermina Malanovic
- Institute of Molecular Biosciences, Biophysics Division, University of Graz, NAWI Graz, Austria.
| | - Karl Lohner
- Institute of Molecular Biosciences, Biophysics Division, University of Graz, NAWI Graz, Austria.
- BioTechMed Graz, Humboldtstrasse 50/III, 8010 Graz, Austria.
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156
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Soares JR, José Tenório de Melo E, da Cunha M, Fernandes KVS, Taveira GB, da Silva Pereira L, Pimenta S, Trindade FG, Regente M, Pinedo M, de la Canal L, Gomes VM, de Oliveira Carvalho A. Interaction between the plant ApDef 1 defensin and Saccharomyces cerevisiae results in yeast death through a cell cycle- and caspase-dependent process occurring via uncontrolled oxidative stress. Biochim Biophys Acta Gen Subj 2016; 1861:3429-3443. [PMID: 27614033 DOI: 10.1016/j.bbagen.2016.09.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 08/24/2016] [Accepted: 09/04/2016] [Indexed: 01/15/2023]
Abstract
BACKGROUND Plant defensins were discovered at beginning of the 90s'; however, their precise mechanism of action is still unknown. Herein, we studied ApDef1-Saccharomyces cerevisiae interaction. METHODS ApDef1-S. cerevisiae interaction was studied by determining the MIC, viability and death kinetic assays. Viability assay was repeated with hydroxyurea synchronized-yeast and pretreated with CCCP. Plasma membrane permeabilization, ROS induction, chromatin condensation, and caspase activation analyses were assessed through Sytox green, DAB, DAPI and FITC-VAD-FMK, respectively. Viability assay was done in presence of ascorbic acid and Z-VAD-FMK. Ultrastructural analysis was done by electron microscopy. RESULTS ApDef1 caused S. cerevisiae cell death and MIC was 7.8μM. Whole cell population died after 18h of ApDef1 interaction. After 3h, 98.76% of synchronized cell population died. Pretreatment with CCCP protected yeast from ApDef1 induced death. ApDef1-S. cerevisiae interaction resulted in membrane permeabilization, H2O2 increased production, chromatin condensation and caspase activation. Ascorbic acid prevented yeast cell death and membrane permeabilization. Z-VAD-FMK prevented yeast cell death. CONCLUSIONS ApDef1-S. cerevisiae interaction caused cell death through cell cycle dependentprocess which requires preserved membrane potential. After interaction, yeast went through uncontrolled ROS production and accumulation, which led to plasma membrane permeabilization, chromatin condensation and, ultimately, cell death by activation of caspase-dependent apoptosis via. GENERAL SIGNIFICANCE We show novel requirements for the interaction between plant defensin and fungi cells, i.e. cell cycle phase and membrane potential, and we indicate that membrane permeabilization is probably caused by ROS and therefore, it would be an indirect event of the ApDef1-S. cerevisiae interaction.
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Affiliation(s)
- Júlia Ribeiro Soares
- Laboratório de Fisiologia e Bioquímica de Microrganismos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Edésio José Tenório de Melo
- Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Maura da Cunha
- Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Kátia Valevski Sales Fernandes
- Laboratório de Química e Função de Proteínas e Peptídeos, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Gabriel Bonan Taveira
- Laboratório de Fisiologia e Bioquímica de Microrganismos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Lidia da Silva Pereira
- Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Samy Pimenta
- Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Fernanda Gomes Trindade
- Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - Mariana Regente
- Instituto de Investigaciones Biologicas, Universidad Nacional de Mar del Plata -CONICET, Mar del Plata, Argentina
| | - Marcela Pinedo
- Instituto de Investigaciones Biologicas, Universidad Nacional de Mar del Plata -CONICET, Mar del Plata, Argentina
| | - Laura de la Canal
- Instituto de Investigaciones Biologicas, Universidad Nacional de Mar del Plata -CONICET, Mar del Plata, Argentina
| | - Valdirene Moreira Gomes
- Laboratório de Fisiologia e Bioquímica de Microrganismos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil
| | - André de Oliveira Carvalho
- Laboratório de Fisiologia e Bioquímica de Microrganismos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes, RJ, Brazil.
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157
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Eckhard LH, Houri-Haddad Y, Sol A, Zeharia R, Shai Y, Beyth S, Domb AJ, Bachrach G, Beyth N. Sustained Release of Antibacterial Lipopeptides from Biodegradable Polymers against Oral Pathogens. PLoS One 2016; 11:e0162537. [PMID: 27606830 PMCID: PMC5015835 DOI: 10.1371/journal.pone.0162537] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 08/24/2016] [Indexed: 11/24/2022] Open
Abstract
The development of antibacterial drugs to overcome various pathogenic species, which inhabit the oral cavity, faces several challenges, such as salivary flow and enzymatic activity that restrict dosage retention. Owing to their amphipathic nature, antimicrobial peptides (AMPs) serve as the first line of defense of the innate immune system. The ability to synthesize different types of AMPs enables exploitation of their advantages as alternatives to antibiotics. Sustained release of AMPs incorporated in biodegradable polymers can be advantageous in maintaining high levels of the peptides. In this study, four potent ultra-short lipopeptides, conjugated to an aliphatic acid chain (16C) were incorporated in two different biodegradable polymers: poly (lactic acid co castor oil) (PLACO) and ricinoleic acid-based poly (ester-anhydride) (P(SA-RA)) for sustained release. The lipopeptide and polymer formulations were tested for antibacterial activity during one week, by turbidometric measurements of bacterial outgrowth, anti-biofilm activity by live/dead staining, biocompatibility by hemolysis and XTT colorimetric assays, mode of action by fluorescence-activated cell sorting (FACS) and release profile by a fluorometric assay. The results show that an antibacterial and anti-biofilm effect, as well as membrane disruption, can be achieved by the use of a formulation of lipopeptide incorporated in biodegradable polymer.
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Affiliation(s)
- Lea H. Eckhard
- Department of Prosthodontics, the Hebrew University–Faculty of Dental Medicine, Jerusalem, Israel
| | - Yael Houri-Haddad
- Department of Prosthodontics, the Hebrew University–Faculty of Dental Medicine, Jerusalem, Israel
| | - Asaf Sol
- Institute of Dental Science, the Hebrew University–Faculty of Dental Medicine, Jerusalem, Israel
| | - Rotem Zeharia
- Department of Prosthodontics, the Hebrew University–Faculty of Dental Medicine, Jerusalem, Israel
| | - Yechiel Shai
- Department of Biological Chemistry, the Weizmann Institute of Science, Rehovot, Israel
| | - Shaul Beyth
- Orthopedic Surgery Department, Hadassah Medical Center, Jerusalem, Israel
| | - Abraham J. Domb
- Institute for Drug Research, School of Pharmacology, Faculty of Medicine, the Hebrew University, Jerusalem, Israel
| | - Gilad Bachrach
- Institute of Dental Science, the Hebrew University–Faculty of Dental Medicine, Jerusalem, Israel
| | - Nurit Beyth
- Department of Prosthodontics, the Hebrew University–Faculty of Dental Medicine, Jerusalem, Israel
- * E-mail:
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158
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Meisel JW, Patel MB, Garrad E, Stanton RA, Gokel GW. Reversal of Tetracycline Resistance in Escherichia coli by Noncytotoxic bis(Tryptophan)s. J Am Chem Soc 2016; 138:10571-7. [DOI: 10.1021/jacs.6b05578] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joseph W. Meisel
- Center for Nanoscience, Departments of ‡Chemistry & Biochemistry and §Biology, University of Missouri − St. Louis, 1 University Blvd., St. Louis, Missouri 63121, United States
| | - Mohit B. Patel
- Center for Nanoscience, Departments of ‡Chemistry & Biochemistry and §Biology, University of Missouri − St. Louis, 1 University Blvd., St. Louis, Missouri 63121, United States
| | - Evan Garrad
- Center for Nanoscience, Departments of ‡Chemistry & Biochemistry and §Biology, University of Missouri − St. Louis, 1 University Blvd., St. Louis, Missouri 63121, United States
| | - Ryan A. Stanton
- Center for Nanoscience, Departments of ‡Chemistry & Biochemistry and §Biology, University of Missouri − St. Louis, 1 University Blvd., St. Louis, Missouri 63121, United States
| | - George W. Gokel
- Center for Nanoscience, Departments of ‡Chemistry & Biochemistry and §Biology, University of Missouri − St. Louis, 1 University Blvd., St. Louis, Missouri 63121, United States
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159
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Branco P, Francisco D, Monteiro M, Almeida MG, Caldeira J, Arneborg N, Prista C, Albergaria H. Antimicrobial properties and death-inducing mechanisms of saccharomycin, a biocide secreted by Saccharomyces cerevisiae. Appl Microbiol Biotechnol 2016; 101:159-171. [PMID: 27502415 DOI: 10.1007/s00253-016-7755-6] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 07/07/2016] [Accepted: 07/19/2016] [Indexed: 11/26/2022]
Abstract
We recently found that Saccharomyces cerevisiae (strain CCMI 885) secretes antimicrobial peptides (AMPs) derived from the glycolytic enzyme glyceraldehyde 3-phosphate dehydrogenase (GAPDH) that are active against various wine-related yeast and bacteria. Here, we show that several other S. cerevisiae strains also secrete natural biocide fractions during alcoholic fermentation, although at different levels, which correlates with the antagonistic effect exerted against non-Saccharomyces yeasts. We, therefore, term this biocide saccharomycin. The native AMPs were purified by gel-filtration chromatography and its antimicrobial activity was compared to that exhibited by chemically synthesized analogues (AMP1 and AMP2/3). Results show that the antimicrobial activity of the native AMPs is significantly higher than that of the synthetic analogues (AMP1 and AMP2/3), but a conjugated action of the two synthetic peptides is observed. Moreover, while the natural AMPs are active at pH 3.5, the synthetic peptides are not, since they are anionic and cannot dissolve at this acidic pH. These findings suggest that the molecular structure of the native biocide probably involves the formation of aggregates of several peptides that render them soluble under acidic conditions. The death mechanisms induced by the AMPs were also evaluated by means of epifluorescence microscopy-based methods. Sensitive yeast cells treated with the synthetic AMPs show cell membrane disruption, apoptotic molecular markers, and internalization of the AMPs. In conclusion, our work shows that saccharomycin is a natural biocide secreted by S. cerevisiae whose activity depends on the conjugated action of GAPDH-derived peptides. This study also reveals that S. cerevisiae secretes GAPDH-derived peptides as a strategy to combat other microbial species during alcoholic fermentations.
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Affiliation(s)
- Patrícia Branco
- Unit of Bioenergy, Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal
- Research Center Linking Landscape, Environment, Agriculture and Food (LEAF), Tapada da Ajuda, 1349-017, Lisbon, Portugal
| | - Diana Francisco
- Unit of Bioenergy, Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal
| | - Margarida Monteiro
- Unit of Bioenergy, Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal
| | - Maria Gabriela Almeida
- UCIBIO REquimte, Depart. Química, Faculdade de Ciências e Tecnologia (UNL), 2829-516, Monte Caparica, Portugal
- Centro de investigação interdisciplinar Egas Moniz ISCSEM, Quinta da Granja, 2829-511, Monte Caparica, Portugal
| | - Jorge Caldeira
- UCIBIO REquimte, Depart. Química, Faculdade de Ciências e Tecnologia (UNL), 2829-516, Monte Caparica, Portugal
- Centro de investigação interdisciplinar Egas Moniz ISCSEM, Quinta da Granja, 2829-511, Monte Caparica, Portugal
| | - Nils Arneborg
- Department of Food Science, Faculty of Life Sciences, University of Copenhagen, Rolighedsvej 30, 1958, Frederiksberg C, Denmark
| | - Catarina Prista
- Research Center Linking Landscape, Environment, Agriculture and Food (LEAF), Tapada da Ajuda, 1349-017, Lisbon, Portugal
| | - Helena Albergaria
- Unit of Bioenergy, Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal.
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160
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Jasim B, Mathew J, Radhakrishnan E. Identification of a novel endophytic Bacillus
sp. from Capsicum annuum
with highly efficient and broad spectrum plant probiotic effect. J Appl Microbiol 2016; 121:1079-94. [DOI: 10.1111/jam.13214] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 02/24/2016] [Accepted: 03/15/2016] [Indexed: 11/29/2022]
Affiliation(s)
- B. Jasim
- School of Biosciences; Mahatma Gandhi University; Kottayam Kerala India
| | - J. Mathew
- School of Biosciences; Mahatma Gandhi University; Kottayam Kerala India
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161
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New Insight into Daptomycin Bioavailability and Localization in Staphylococcus aureus Biofilms by Dynamic Fluorescence Imaging. Antimicrob Agents Chemother 2016; 60:4983-90. [PMID: 27297479 DOI: 10.1128/aac.00735-16] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 06/03/2016] [Indexed: 01/07/2023] Open
Abstract
Staphylococcus aureus is one of the most frequent pathogens responsible for biofilm-associated infections (BAI), and the choice of antibiotics to treat these infections remains a challenge for the medical community. In particular, daptomycin has been reported to fail against implant-associated S. aureus infections in clinical practice, while its association with rifampin remains a good candidate for BAI treatment. To improve our understanding of such resistance/tolerance toward daptomycin, we took advantage of the dynamic fluorescence imaging tools (time-lapse imaging and fluorescence recovery after photobleaching [FRAP]) to locally and accurately assess the antibiotic diffusion reaction in methicillin-susceptible and methicillin-resistant S. aureus biofilms. To provide a realistic representation of daptomycin action, we optimized an in vitro model built on the basis of our recently published in vivo mouse model of prosthetic vascular graft infections. We demonstrated that at therapeutic concentrations, daptomycin was inefficient in eradicating biofilms, while the matrix was not a shield to antibiotic diffusion and to its interaction with its bacterial target. In the presence of rifampin, daptomycin was still present in the vicinity of the bacterial cells, allowing prevention of the emergence of rifampin-resistant mutants. Conclusions derived from this study strongly suggest that S. aureus biofilm resistance/tolerance toward daptomycin may be more likely to be related to a physiological change involving structural modifications of the membrane, which is a strain-dependent process.
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162
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Abstract
This paper elucidates the teixobactin pharmacophore by comparing the arginine analogue of teixobactin Arg10-teixobactin to seven homologues with varying structure and stereochemistry. The roles of the guanidinium group at position 10, the stereochemistry of the macrolactone ring, and the "tail" comprising residues 1-5 are investigated. The guanidinium group is not necessary for activity; Lys10-teixobactin is more active than Arg10-teixobactin against Gram-positive bacteria in minimum inhibitory concentration (MIC) assays. The relative stereochemistry of the macrolactone ring is important. Diastereomer l-Thr8,Arg10-teixobactin is inactive, and diastereomer d-allo-Ile11,Arg10-teixobactin is less active. The macrolactone ring is critical; seco-Arg10-teixobactin is inactive. The absolute stereochemistry is not important; the enantiomer ent-Arg10-teixobactin is comparable in activity. The hydrophobic N-terminal tail is important. Truncation of residues 1-5 results in loss of activity, and replacement of residues 1-5 with a dodecanoyl group partially restores activity. These findings pave the way for developing simpler homologues of teixobactin with enhanced pharmacological properties.
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Affiliation(s)
- Hyunjun Yang
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Kevin H. Chen
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States
| | - James S. Nowick
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States
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163
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Jasim B, Sreelakshmi KS, Mathew J, Radhakrishnan EK. Surfactin, Iturin, and Fengycin Biosynthesis by Endophytic Bacillus sp. from Bacopa monnieri. MICROBIAL ECOLOGY 2016; 72:106-119. [PMID: 27021396 DOI: 10.1007/s00248-016-0753-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 03/08/2016] [Indexed: 05/15/2023]
Abstract
Endophytic microorganisms which are ubiquitously present in plants may colonize intracellularly or intercellularly without causing any diseases. By living within the unique chemical environment of a host plant, they produce a vast array of compounds with a wide range of biological activities. Because of this, natural products of endophytic origin have been exploited for antimicrobial, antiviral, anticancer, and antioxidant properties. Also, they can be considered to function as an efficient microbial barrier to protect plants from various pathogens. In the present study, endophytic bacterium BmB 9 with antifungal and antibacterial activity isolated from the stem tissue of Bacopa monnieri was studied for the molecular and chemical basis of its activity. PCR-based genome mining for various biosynthetic gene clusters proved the presence of surfactin, iturin, and type I polyketide synthase (PKS) genes in the isolate. The LC-MS/MS based analysis of the extract further confirmed the production of surfactin derivatives (M + H(+)-1008.6602, 1022.6755), iturin (M + H(+)-1043.5697), and fengycin (M + H(+)-1491.8195, 1477.8055) by the selected bacterial isolate. The 16S rDNA sequence similarity based analysis identified the isolate BmB 9 as Bacillus sp. with 100 % identity to Bacillus sp. LCF1 (KP257289).
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Affiliation(s)
- B Jasim
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala, 686 560, India
| | - K S Sreelakshmi
- School of Biotechnology, Amrita Vishwa Vidhyapeetham, Clapppana, Kollam, Kerala, 690 525, India
| | - Jyothis Mathew
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala, 686 560, India
| | - E K Radhakrishnan
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala, 686 560, India.
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164
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Lin D, Grossfield A. Thermodynamics of Micelle Formation and Membrane Fusion Modulate Antimicrobial Lipopeptide Activity. Biophys J 2016; 109:750-9. [PMID: 26287627 DOI: 10.1016/j.bpj.2015.07.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 06/04/2015] [Accepted: 07/01/2015] [Indexed: 11/18/2022] Open
Abstract
Antimicrobial lipopeptides (AMLPs) are antimicrobial drug candidates that preferentially target microbial membranes. One class of AMLPs, composed of cationic tetrapeptides attached to an acyl chain, have minimal inhibitory concentrations in the micromolar range against a range of bacteria and fungi. Previously, we used coarse-grained molecular dynamics simulations and free energy methods to study the thermodynamics of their interaction with membranes in their monomeric state. Here, we extended the study to the biologically relevant micellar state, using, to our knowledge, a novel reaction coordinate based on hydrophobic contacts. Using umbrella sampling along this reaction coordinate, we identified the critical transition states when micelles insert into membranes. The results indicate that the binding of these AMLP micelles to membranes is thermodynamically favorable, but in contrast to the monomeric case, there are significant free energy barriers. The height of these free energy barriers depends on the membrane composition, suggesting that the AMLPs' ability to selectively target bacterial membranes may be as much kinetic as thermodynamic. This mechanism highlights the importance of considering oligomeric state in solution as criterion when optimizing peptides or lipopeptides as antibiotic leads.
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Affiliation(s)
- Dejun Lin
- Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, New York
| | - Alan Grossfield
- Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, New York.
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165
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Deslouches B, Hasek ML, Craigo JK, Steckbeck JD, Montelaro RC. Comparative functional properties of engineered cationic antimicrobial peptides consisting exclusively of tryptophan and either lysine or arginine. J Med Microbiol 2016; 65:554-565. [PMID: 27046192 DOI: 10.1099/jmm.0.000258] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
We previously reported a series of de novo engineered cationic antibiotic peptides (eCAPs) consisting exclusively of arginine and tryptophan (WR) that display potent activity against diverse multidrug-resistant (MDR) bacterial strains. In this study, we sought to examine the influence of arginine compared to lysine on antibacterial properties by direct comparison of the WR peptides (8-18 residues) with a parallel series of engineered peptides containing only lysine and tryptophan. WR and WK series were compared for antibacterial activity by bacterial killing and growth inhibition assays and for mechanism of peptide-bacteria interactions by surface plasmon resonance and flow cytometry. Mammalian cytotoxicity was also assessed by flow cytometry, haemolytic and tetrazolium-based assays. The shortest arginine-containing peptides (8 and 10 mers) displayed a statistically significant increase in activity compared to the analogous lysine-containing peptides. The WR and WK peptides achieved maximum antibacterial activity at the 12-mer peptide (WK12 or WR12). Further examination of antibacterial mechanisms of the optimally active 12-mer peptides using surface plasmon resonance and flow cytometry demonstrates stronger interactions with Pseudomonasaeruginosa, greater membrane permeabilizing activity, and lower inhibitory effects of divalent cations on activity and membrane permeabilization properties of WR12 compared to WK12 (P < 0.05). Importantly, WK12 and WR12 displayed similar negligible haemolytic and cytotoxic effects at peptide concentrations up to ten times the MIC or 20 times the minimum bactericidal concentration. Thus, arginine, compared to lysine, can indeed yield enhanced antibacterial activity to minimize the required length to achieve functional antimicrobial peptides.
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Affiliation(s)
- Berthony Deslouches
- Center for Vaccine Research and Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Mary L Hasek
- Center for Vaccine Research and Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Jodi K Craigo
- Center for Vaccine Research and Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Jonathan D Steckbeck
- Center for Vaccine Research and Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Ronald C Montelaro
- Center for Vaccine Research and Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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166
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Synthetic Cyclolipopeptides Selective against Microbial, Plant and Animal Cell Targets by Incorporation of D-Amino Acids or Histidine. PLoS One 2016; 11:e0151639. [PMID: 27008420 PMCID: PMC4805166 DOI: 10.1371/journal.pone.0151639] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 03/02/2016] [Indexed: 12/13/2022] Open
Abstract
Cyclolipopeptides derived from the antimicrobial peptide c(Lys-Lys-Leu-Lys-Lys-Phe-Lys-Lys-Leu-Gln) (BPC194) were prepared on solid-phase and screened against four plant pathogens. The incorporation at Lys5 of fatty acids of 4 to 9 carbon atoms led to active cyclolipopeptides. The influence on the antimicrobial activity of the Lys residue that is derivatized was also evaluated. In general, acylation of Lys1, Lys2 or Lys5 rendered the sequences with the highest activity. Incorporation of a D-amino acid maintained the antimicrobial activity while significantly reduced the hemolysis. Replacement of Phe with a His also yielded cyclolipopeptides with low hemolytic activity. Derivatives exhibiting low phytotoxicity in tobacco leaves were also found. Interestingly, sequences with or without significant activity against phytopathogenic bacteria and fungi, but with differential hemolysis and phytotoxicity were identified. Therefore, this study represents an approach to the development of bioactive peptides with selective activity against microbial, plant and animal cell targets. These selective cyclolipopeptides are candidates useful not only to combat plant pathogens but also to be applied in other fields.
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167
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Jasim B, Benny R, Sabu R, Mathew J, Radhakrishnan EK. Metabolite and Mechanistic Basis of Antifungal Property Exhibited by Endophytic Bacillus amyloliquefaciens BmB 1. Appl Biochem Biotechnol 2016; 179:830-45. [DOI: 10.1007/s12010-016-2034-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Accepted: 02/25/2016] [Indexed: 10/22/2022]
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168
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NH125 kills methicillin-resistant Staphylococcus aureus persisters by lipid bilayer disruption. Future Med Chem 2016; 8:257-69. [PMID: 26910612 DOI: 10.4155/fmc.15.189] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND NH125, a known WalK inhibitor kills MRSA persisters. However, its precise mode of action is still unknown. METHODS & RESULTS The mode of action of NH125 was investigated by comparing its spectrum of antimicrobial activity and its effects on membrane permeability and giant unilamellar vesicles (GUVs) with walrycin B, a WalR inhibitor and benzyldimethylhexadecylammonium chloride (16-BAC), a cationic surfactant. NH125 killed persister cells of a variety of Staphylococcus aureus strains. Similar to 16-BAC, NH125 killed MRSA persisters by inducing rapid membrane permeabilization and caused the rupture of GUVs, whereas walrycin B did not kill MRSA persisters or induce membrane permeabilization and did not affect GUVs. CONCLUSION NH125 kills MRSA persisters by interacting with and disrupting membranes in a detergent-like manner.
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169
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Pinazo A, Manresa M, Marques A, Bustelo M, Espuny M, Pérez L. Amino acid–based surfactants: New antimicrobial agents. Adv Colloid Interface Sci 2016; 228:17-39. [PMID: 26792016 DOI: 10.1016/j.cis.2015.11.007] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 11/10/2015] [Accepted: 11/10/2015] [Indexed: 12/11/2022]
Abstract
The rapid increase of drug resistant bacteria makes necessary the development of new antimicrobial agents. Synthetic amino acid-based surfactants constitute a promising alternative to conventional antimicrobial compounds given that they can be prepared from renewable raw materials. In this review, we discuss the structural features that promote antimicrobial activity of amino acid-based surfactants. Monocatenary, dicatenary and gemini surfactants that contain different amino acids on the polar head and show activity against bacteria are revised. The synthesis and basic physico-chemical properties have also been included.
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170
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Monaco M, Pimentel de Araujo F, Cruciani M, Coccia EM, Pantosti A. Worldwide Epidemiology and Antibiotic Resistance of Staphylococcus aureus. Curr Top Microbiol Immunol 2016; 409:21-56. [PMID: 27025380 DOI: 10.1007/82_2016_3] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Staphylococcus aureus is an important human pathogen, responsible for infections in the community and the healthcare setting. Although much of the attention is focused on the methicillin-resistant "variant" MRSA, the methicillin-susceptible counterpart (MSSA) remains a prime species in infections. The epidemiology of S. aureus, especially of MRSA, showed a rapid evolution in the last years. After representing a typical nosocomial multidrug-resistant pathogen, MRSA has recently emerged in the community and among farmed animals thanks to its ability to evolve and adapt to different settings. Global surveillance has shown that MRSA represents a problem in all continents and countries where studies have been carried out, determining an increase in mortality and the need to use last-resource expensive antibiotics. S. aureus can easily acquire resistance to antibiotics and MRSA is characteristically multidrug resistant. Resistance to vancomycin, the principal anti-MRSA antibiotic is rare, although isolates with decreased susceptibility are recovered in many areas. Resistance to the more recently introduced antibiotics, linezolid and daptomycin, has emerged; however, they remain substantially active against the large majority of MSSA and MRSA. Newer antistaphylococcal drugs have been developed, but since their clinical use has been very limited so far, little is known about the emergence of resistance. Molecular typing techniques have allowed to identify the major successful clones and lineages of MSSA and MRSA, including high-risk clones, and to trace their diffusion. In the face of a continuously evolving scenario, this review depicts the most common clones circulating in different geographical areas and in different settings at present. Since the evolution of S. aureus will continue, it is important to maintain the attention on the epidemiology of S. aureus in the future with a global view.
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Affiliation(s)
- Monica Monaco
- Department of Infectious, Parasitic and Immuno-mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
| | - Fernanda Pimentel de Araujo
- Department of Infectious, Parasitic and Immuno-mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
| | - Melania Cruciani
- Department of Infectious, Parasitic and Immuno-mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
| | - Eliana M Coccia
- Department of Infectious, Parasitic and Immuno-mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy.
| | - Annalisa Pantosti
- Department of Infectious, Parasitic and Immuno-mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy.
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171
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Steinbuch KB, Fridman M. Mechanisms of resistance to membrane-disrupting antibiotics in Gram-positive and Gram-negative bacteria. MEDCHEMCOMM 2016. [DOI: 10.1039/c5md00389j] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A diverse repertoire of mechanisms has evolved to confer resistance to bacterial membrane disrupting antimicrobial cationic amphiphiles.
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Affiliation(s)
- Kfir B. Steinbuch
- School of Chemistry
- Beverly Raymond Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| | - Micha Fridman
- School of Chemistry
- Beverly Raymond Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
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172
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Sawant P, Eissenberger K, Karier L, Mascher T, Bramkamp M. A dynamin-like protein involved in bacterial cell membrane surveillance under environmental stress. Environ Microbiol 2015; 18:2705-20. [PMID: 26530236 DOI: 10.1111/1462-2920.13110] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 10/28/2015] [Accepted: 10/28/2015] [Indexed: 01/27/2023]
Abstract
In ever-changing natural environments, bacteria are continuously challenged with numerous biotic and abiotic stresses. Accordingly, they have evolved both specific and more general mechanisms to counteract stress-induced damage and ensure survival. In the soil habitat of Bacillus subtilis, peptide antibiotics and bacteriophages are among the primary stressors that affect the integrity of the cytoplasmic membrane. Dynamin-like proteins (DLPs) play a major role in eukaryotic membrane re-modelling processes, including antiviral activities, but the function of the corresponding bacterial homologues was so far poorly understood. Here, we report on the protective function of a bacterial DLP, DynA from B. subtilis. We provide evidence that DynA plays an important role in a membrane surveillance system that counteracts membrane pore formation provoked by antibiotics and phages. In unstressed cells, DynA is a highly dynamic membrane-associated protein. Upon membrane damage, DynA localizes into large and static assemblies, where DynA acts locally to counteract stress-induced pores, presumably by inducing lipid bilayer fusion and sealing membrane gaps. Thus, lack of DynA increases the sensitivity to antibiotic exposure and phage infection. Taken together, our work suggests that DynA, and potentially other bacterial DLPs, contribute to the innate immunity of bacteria against membrane stress.
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Affiliation(s)
- Prachi Sawant
- Department of Biology I, Ludwig-Maximilians-University Munich, Großhaderner Str. 2-4, 82152, Planegg-Martinsried, Germany
| | - Kristina Eissenberger
- Department of Biology I, Ludwig-Maximilians-University Munich, Großhaderner Str. 2-4, 82152, Planegg-Martinsried, Germany
| | - Laurence Karier
- Department of Biology I, Ludwig-Maximilians-University Munich, Großhaderner Str. 2-4, 82152, Planegg-Martinsried, Germany
| | - Thorsten Mascher
- Department of Biology I, Ludwig-Maximilians-University Munich, Großhaderner Str. 2-4, 82152, Planegg-Martinsried, Germany
| | - Marc Bramkamp
- Department of Biology I, Ludwig-Maximilians-University Munich, Großhaderner Str. 2-4, 82152, Planegg-Martinsried, Germany
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173
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Phylloseptin-PBa--A Novel Broad-Spectrum Antimicrobial Peptide from the Skin Secretion of the Peruvian Purple-Sided Leaf Frog (Phyllomedusa Baltea) Which Exhibits Cancer Cell Cytotoxicity. Toxins (Basel) 2015; 7:5182-93. [PMID: 26633506 PMCID: PMC4690128 DOI: 10.3390/toxins7124878] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 11/09/2015] [Accepted: 11/23/2015] [Indexed: 11/17/2022] Open
Abstract
Antimicrobial peptides from amphibian skin secretion display remarkable broad-spectrum antimicrobial activity and are thus promising for the discovery of new antibiotics. In this study, we report a novel peptide belonging to the phylloseptin family of antimicrobial peptides, from the skin secretion of the purple-sided leaf frog, Phyllomedusa baltea, which was named Phylloseptin-PBa. Degenerate primers complementary to putative signal peptide sites of frog skin peptide precursor-encoding cDNAs were designed to interrogate a skin secretion-derived cDNA library from this frog. Subsequently, the peptide was isolated and identified using reverse phase HPLC and MS/MS fragmentation. The synthetic replicate was demonstrated to have activity against S. aureus, E. coli and C. albicans at concentrations of 8, 128 and 8 mg/L, respectively. In addition, it exhibited anti-proliferative activity against the human cancer cell lines, H460, PC3 and U251MG, but was less active against a normal human cell line (HMEC). Furthermore, a haemolysis assay was performed to assess mammalian cell cytotoxicity of Phylloseptin-PBa. This peptide contained a large proportion of α-helical domain, which may explain its antimicrobial and anticancer activities.
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174
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Antimicrobial peptide production and plant-based expression systems for medical and agricultural biotechnology. Biotechnol Adv 2015; 33:1005-23. [DOI: 10.1016/j.biotechadv.2015.03.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Revised: 02/25/2015] [Accepted: 03/10/2015] [Indexed: 11/24/2022]
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175
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Abd-El-Aziz AS, Agatemor C, Etkin N, Overy DP, Lanteigne M, McQuillan K, Kerr RG. Antimicrobial Organometallic Dendrimers with Tunable Activity against Multidrug-Resistant Bacteria. Biomacromolecules 2015; 16:3694-703. [DOI: 10.1021/acs.biomac.5b01207] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Alaa S. Abd-El-Aziz
- Department
of Chemistry, University of Prince Edward Island, 550 University
Avenue, Charlottetown, Prince
Edward Island C1A 4P3, Canada
| | - Christian Agatemor
- Department
of Chemistry, University of Prince Edward Island, 550 University
Avenue, Charlottetown, Prince
Edward Island C1A 4P3, Canada
| | - Nola Etkin
- Department
of Chemistry, University of Prince Edward Island, 550 University
Avenue, Charlottetown, Prince
Edward Island C1A 4P3, Canada
| | - David P. Overy
- Department
of Chemistry, University of Prince Edward Island, 550 University
Avenue, Charlottetown, Prince
Edward Island C1A 4P3, Canada
- Department
of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island C1A 4P3, Canada
| | - Martin Lanteigne
- Department
of Chemistry, University of Prince Edward Island, 550 University
Avenue, Charlottetown, Prince
Edward Island C1A 4P3, Canada
| | - Katherine McQuillan
- Department
of Chemistry, University of Prince Edward Island, 550 University
Avenue, Charlottetown, Prince
Edward Island C1A 4P3, Canada
| | - Russell G. Kerr
- Department
of Chemistry, University of Prince Edward Island, 550 University
Avenue, Charlottetown, Prince
Edward Island C1A 4P3, Canada
- Department
of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island C1A 4P3, Canada
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176
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The effect of glycine replacement with flexible ω-amino acids on the antimicrobial and haemolytic activity of an amphipathic cyclic heptapeptide. Eur J Med Chem 2015; 102:574-81. [DOI: 10.1016/j.ejmech.2015.08.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 08/11/2015] [Accepted: 08/13/2015] [Indexed: 12/12/2022]
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177
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Jiang H, Wang X, Xiao C, Wang W, Zhao X, Sui J, Sa R, Guo TL, Liu X. Antifungal activity of Brevibacillus laterosporus JX-5 and characterization of its antifungal components. World J Microbiol Biotechnol 2015; 31:1605-18. [PMID: 26265360 DOI: 10.1007/s11274-015-1912-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 07/20/2015] [Indexed: 10/23/2022]
Abstract
The establishment of safe and effective methods for controlling fungal disease is an urgent issue in agriculture and forestry. Microbiological control of plant disease is expected to achieve better results than use of chemically derived fungicides. This study aimed to establish Brevibacillus laterosporus JX-5 as a potential microbiological control agent of poplar canker. The bacterium was isolated from the poplar rhizosphere and demonstrated significant growth inhibition of several pathogenic fungi in vitro. The antifungal components of Br. laterosporus JX-5 were isolated and identified. The fermentation broth of Br. laterosporus JX-5 and its main antifungal component, designated as component B, reduced Botryosphaeria dothidea associated canker of the excised poplar branch by 70 and 90%, respectively. Component B is considerably heat-stable, adaptable to a broad pH range, and UV-resistant. It could inhibit Bo. dothidea by permeating the fungal membrane, fracturing the nuclei, damaging the cell wall, and eventually killing the pathogenic fungus. The antifungal activity exhibited by Br. laterosporus JX-5 and its bioactive metabolic products indicate its feasibility as a potential biocontrol agent for plant diseases.
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Affiliation(s)
- Hongxia Jiang
- College of Life Science, Shandong Agricultural University, Taian, 271018, China. .,School of Life Science, Taishan Medical University, Taian, 271018, China.
| | - Xiaohui Wang
- College of Life Science, Shandong Agricultural University, Taian, 271018, China
| | - Chengze Xiao
- College of Forestry, Shandong Agricultural University, Taian, 271018, China
| | - Weiyan Wang
- College of Forestry, Shandong Agricultural University, Taian, 271018, China
| | - Xu Zhao
- College of Forestry, Shandong Agricultural University, Taian, 271018, China
| | - Junkang Sui
- College of Life Science, Shandong Agricultural University, Taian, 271018, China
| | - Rongbo Sa
- College of Life Science, Shandong Agricultural University, Taian, 271018, China.,School of Life Science, Taishan Medical University, Taian, 271018, China
| | - Tai L Guo
- Department of Veterinary Biosciences and Diagnostic Imaging, College of Veterinary Medicine, University of Georgia, Athens, GA, 30602-7382, USA.
| | - Xunli Liu
- College of Forestry, Shandong Agricultural University, Taian, 271018, China.
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178
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Hoque J, Konai MM, Gonuguntla S, Manjunath GB, Samaddar S, Yarlagadda V, Haldar J. Membrane Active Small Molecules Show Selective Broad Spectrum Antibacterial Activity with No Detectable Resistance and Eradicate Biofilms. J Med Chem 2015; 58:5486-500. [DOI: 10.1021/acs.jmedchem.5b00443] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Jiaul Hoque
- Chemical
Biology and Medicinal
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
| | - Mohini M. Konai
- Chemical
Biology and Medicinal
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
| | - Spandhana Gonuguntla
- Chemical
Biology and Medicinal
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
| | - Goutham B. Manjunath
- Chemical
Biology and Medicinal
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
| | - Sandip Samaddar
- Chemical
Biology and Medicinal
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
| | - Venkateswarlu Yarlagadda
- Chemical
Biology and Medicinal
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
| | - Jayanta Haldar
- Chemical
Biology and Medicinal
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
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179
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Lin D, Grossfield A. Thermodynamics of antimicrobial lipopeptide binding to membranes: origins of affinity and selectivity. Biophys J 2015; 107:1862-1872. [PMID: 25418167 DOI: 10.1016/j.bpj.2014.08.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 08/25/2014] [Accepted: 08/29/2014] [Indexed: 10/24/2022] Open
Abstract
The development of novel antibiotic drugs is one of the most pressing biomedical problems due to the increasing number of antibiotic-resistant pathogens. Antimicrobial peptides and lipopeptides are a promising category of candidates, but the molecular origins of their antimembrane activity is unclear. Here we explore a series of recently developed antimicrobial lipopeptides, using coarse-grained molecular-dynamics simulations and free energy methods to uncover the thermodynamics governing their binding to membranes. Specifically, we quantify C16-KGGK's binding affinity to the two types of membrane by umbrella sampling. We also examined the origin of C16-KGGK's selectivity for bacterial versus mammalian membranes by systematically varying the peptide sequence and salt concentration. Our data showed that the C16 hydrophobic tail is the main contributor to its affinity to lipid membrane, whereas the peptide portion is mainly responsible for its selectivity. Furthermore, the electrostatic interaction between the cationic peptide and anionic bacterial membrane plays a significant role in the selectivity.
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Affiliation(s)
- Dejun Lin
- Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, New York
| | - Alan Grossfield
- Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, New York.
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180
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Ferreira IS, Bettencourt AF, Gonçalves LMD, Kasper S, Bétrisey B, Kikhney J, Moter A, Trampuz A, Almeida AJ. Activity of daptomycin- and vancomycin-loaded poly-epsilon-caprolactone microparticles against mature staphylococcal biofilms. Int J Nanomedicine 2015; 10:4351-66. [PMID: 26185439 PMCID: PMC4500610 DOI: 10.2147/ijn.s84108] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The aim of the present study was to develop novel daptomycin-loaded poly-epsilon-caprolactone (PCL) microparticles with enhanced antibiofilm activity against mature biofilms of clinically relevant bacteria, methicillin-resistant Staphylococcus aureus (MRSA) and polysaccharide intercellular adhesin-positive Staphylococcus epidermidis. Daptomycin was encapsulated into PCL microparticles by a double emulsion-solvent evaporation method. For comparison purposes, formulations containing vancomycin were also prepared. Particle morphology, size distribution, encapsulation efficiency, surface charge, thermal behavior, and in vitro release were assessed. All formulations exhibited a spherical morphology, micrometer size, and negative surface charge. From a very early time stage, the released concentrations of daptomycin and vancomycin were higher than the minimal inhibitory concentration and continued so up to 72 hours. Daptomycin presented a sustained release profile with increasing concentrations of the drug being released up to 72 hours, whereas the release of vancomycin stabilized at 24 hours. The antibacterial activity of the microparticles was assessed by isothermal microcalorimetry against planktonic and sessile MRSA and S. epidermidis. Regarding planktonic bacteria, daptomycin-loaded PCL microparticles presented the highest antibacterial activity against both strains. Isothermal microcalorimetry also revealed that lower concentrations of daptomycin-loaded microparticles were required to completely inhibit the recovery of mature MRSA and S. epidermidis biofilms. Further characterization of the effect of daptomycin-loaded PCL microparticles on mature biofilms was performed by fluorescence in situ hybridization. Fluorescence in situ hybridization showed an important reduction in MRSA biofilm, whereas S. epidermidis biofilms, although inhibited, were not eradicated. In addition, an important attachment of the microparticles to MRSA and S. epidermidis biofilms was observed. Finally, all formulations proved to be biocompatible with both ISO compliant L929 fibroblasts and human MG63 osteoblast-like cells.
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Affiliation(s)
- Inês Santos Ferreira
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Ana F Bettencourt
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Lídia M D Gonçalves
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Stefanie Kasper
- Biofilmcenter, German Heart Institute Berlin, Berlin, Germany
| | - Bertrand Bétrisey
- Infectious Diseases Service, Department of Medicine, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
| | - Judith Kikhney
- Biofilmcenter, German Heart Institute Berlin, Berlin, Germany
| | - Annette Moter
- Biofilmcenter, German Heart Institute Berlin, Berlin, Germany
| | - Andrej Trampuz
- Center for Musculoskeletal Surgery, Charité - University Medicine Berlin, Berlin, Germany
| | - António J Almeida
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
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181
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Vijeetha T, Balakrishna M, Karuna MSL, Surya Koppeswara Rao BV, Prasad RBN, Kumar KP, Surya Narayana Murthy U. Synthesis and Anti-microbial Activity of Novel Phosphatidylethanolamine-N-amino Acid Derivatives. J Oleo Sci 2015; 64:705-12. [PMID: 25994558 DOI: 10.5650/jos.ess15063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The study involved synthesis of five novel amino acid derivatives of phosphatidylethanolamine isolated from egg yolk lecithin employing a three step procedure i) N-protection of L-amino acids with BOC anhydride in alkaline medium ii) condensation of - CO2H group of N-protected amino acid with free -NH2 of PE by a peptide linkage and iii) deprotection of N-protected group of amino acids to obtain phosphatidylethanolamine-N-amino acid derivatives in 60-75% yield. The five L-amino acids used were L glycine, L-valine, L-leucine, L-isoleucine and L-phenylalanine. The amino acid derivatives were screened for anti-baterial activity against B. subtilis, S. aureus, P. aeroginosa and E. coli taking Streptomycin as reference compound and anti-fungal activity against C. albicans, S. cervisiae, A. niger taking AmphotericinB as reference compound. All the amino acid derivatives exhibited extraordinary anti-bacterial activities about 3 folds or comparable to Streptomycin and moderate or no anti-fungal activity against Amphotericin-B.
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Affiliation(s)
- Tadla Vijeetha
- Centre for Lipid Research, CSIR-Indian Institute of Chemical Technology
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182
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Smith JR, Barber KE, Raut A, Rybak MJ. β-Lactams enhance daptomycin activity against vancomycin-resistant Enterococcus faecalis and Enterococcus faecium in in vitro pharmacokinetic/pharmacodynamic models. Antimicrob Agents Chemother 2015; 59:2842-8. [PMID: 25753639 PMCID: PMC4394769 DOI: 10.1128/aac.00053-15] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 02/25/2015] [Indexed: 01/05/2023] Open
Abstract
Enterococcus faecalis and Enterococcus faecium are frequently resistant to vancomycin and β-lactams. In enterococcal infections with reduced glycopeptide susceptibility, combination therapy is often administered. Our objective was to conduct pharmacokinetic/pharmacodynamic (PK/PD) models to evaluate β-lactam synergy with daptomycin (DAP) against resistant enterococci. One E. faecalis strain (R6981) and two E. faecium strains (R6370 and 8019) were evaluated. DAP MICs were obtained. All strains were evaluated for response to LL37, an antimicrobial peptide, in the presence and absence of ceftaroline (CPT), ertapenem (ERT), and ampicillin (AMP). After 96 h, in vitro models were run simulating 10 mg DAP/kg body weight/day, 600 mg CPT every 8 h (q8h), 2 g AMP q4h, and 1 g ERT q24h, both alone and in combination against all strains. DAP MICs were 2, 4, and 4 μg/ml for strains R6981, R6370, and 8019, respectively. PK/PD models demonstrated bactericidal activity with DAP-CPT, DAP-AMP, and DAP-ERT combinations against strain 8019 (P < 0.001 and log10 CFU/ml reduction of >2 compared to any single agent). Against strains R6981 and R6370, the DAP-AMP combination demonstrated enhancement against R6370 but not R6981, while the combinations of DAP-CPT and DAP-ERT were bactericidal, demonstrated enhancement, and were statistically superior to all other regimens at 96 h (P < 0.001) against both strains. CPT, ERT, and AMP similarly augmented LL37 killing against strain 8019. In strains R6981 and R6370, CPT and ERT aided LL37 more than AMP (P < 0.001). Compared to DAP alone, combination regimens provide better killing and prevent resistance. Clinical research involving DAP combinations is warranted.
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Affiliation(s)
- Jordan R Smith
- Anti-Infective Research Laboratory, Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy and Health Sciences, Detroit, Michigan, USA
| | - Katie E Barber
- Anti-Infective Research Laboratory, Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy and Health Sciences, Detroit, Michigan, USA
| | - Animesh Raut
- Anti-Infective Research Laboratory, Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy and Health Sciences, Detroit, Michigan, USA
| | - Michael J Rybak
- Anti-Infective Research Laboratory, Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy and Health Sciences, Detroit, Michigan, USA School of Medicine, Wayne State University, Detroit, Michigan, USA
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183
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Oddo A, Münzker L, Hansen PR. Peptide Macrocycles Featuring a Backbone Secondary Amine: A Convenient Strategy for the Synthesis of Lipidated Cyclic and Bicyclic Peptides on Solid Support. Org Lett 2015; 17:2502-5. [DOI: 10.1021/acs.orglett.5b01026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Alberto Oddo
- Department of Drug Design
and Pharmacology, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Lena Münzker
- Department of Drug Design
and Pharmacology, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Paul R. Hansen
- Department of Drug Design
and Pharmacology, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
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184
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Lohans CT, van Belkum MJ, Li J, Vederas JC. Characterization of bacterial antimicrobial peptides active against Campylobacter jejuni. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0411] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Campylobacter jejuni is one of the major causes of food poisoning, often resulting from the consumption of improperly cooked poultry products. The emergence of C. jejuni strains resistant to conventional antibiotics necessitates the evaluation of other possible treatments or preventative measures to minimize the impact and prevalence of infections. Antimicrobial peptides produced by bacteria have begun to emerge as a potential means of decreasing the levels of C. jejuni in poultry, thereby limiting Campylobacter contamination in associated food products. A number of bacteriocins produced by Gram-positive bacteria have unexpectedly been described as having antimicrobial activity against the Gram-negative C. jejuni. Additionally, some nonribosomal lipopeptides produced by Bacillus and Paenibacillus spp. show efficacy against this pathogen. This review will describe the bacterial antimicrobial peptides reported to be active against C. jejuni, with an emphasis on the characterization of their primary structures. However, for many of these peptides, little is known about their amino acid sequences and structures. Furthermore, there are unusual inconsistencies associated with the reported amino acid sequences for several of the more well-studied bacteriocins. Clarifying the chemical nature of these promising antimicrobial peptides is necessary before their potential utility for livestock protection from C. jejuni can be fully explored. Once these peptides are better characterized, they may prove to be strong candidates for minimizing the impact of Campylobacter on human health.
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Affiliation(s)
- Christopher T. Lohans
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
| | - Marco J. van Belkum
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
| | - Jing Li
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
| | - John C. Vederas
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
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185
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Lee CL, Lam HY, Li X. Serine/threonine ligation for natural cyclic peptide syntheses. Nat Prod Rep 2015; 32:1274-9. [DOI: 10.1039/c5np00001g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The effectiveness of Ser/Thr ligation-mediated peptide cyclization has been demonstrated by the synthesis of cyclic peptide natural products, such as daptomycin, cyclomontanin B, yunnanin C and mahafacyclin B.
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Affiliation(s)
- Chi Lung Lee
- Department of Chemistry
- The University of Hong Kong
- Hong Kong SAR
- China
- Shenzhen Institute of Research and Innovation of The University of Hong Kong
| | - Hiu Yung Lam
- Department of Chemistry
- The University of Hong Kong
- Hong Kong SAR
- China
- Shenzhen Institute of Research and Innovation of The University of Hong Kong
| | - Xuechen Li
- Department of Chemistry
- The University of Hong Kong
- Hong Kong SAR
- China
- State Key Laboratory of Synthetic Chemistry
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186
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Alkotaini B, Anuar N, Kadhum AAH. Evaluation of morphological changes of Staphylococcus aureus and Escherichia coli induced with the antimicrobial peptide AN5-1. Appl Biochem Biotechnol 2014; 175:1868-78. [PMID: 25427593 DOI: 10.1007/s12010-014-1410-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 11/14/2014] [Indexed: 11/30/2022]
Abstract
The mechanisms of action of AN5-1 against Gram-negative and Gram-positive bacteria were investigated by evaluations of the intracellular content leakage and by microscopic observations of the treated cells. Escherichia coli and Staphylococcus aureus were used for this investigation. Measurements of DNA, RNA, proteins, and β-galactosidase were taken, and the results showed a significant increase in the cultivation media after treatment with AN5-1 compared with the untreated cells. The morphological changes of treated cells were shown using transmission electron microscopy (TEM) and atomic force microscopy (AFM). The observations showed that AN5-1 acts against E. coli and against S. aureus in similar ways, by targeting the cell wall, causing disruptions; at a high concentration (80 AU/ml), these disruptions led to cell lysis. The 3D AFM imaging system showed that at a low concentration of 20 AU/ml, the effect of AN5-1 is restricted to pore formation only. Moreover, a separation between the cell wall and the cytoplasm was observed when Gram-negative bacteria were treated with a low concentration (20 AU/ml) of AN5-1.
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Affiliation(s)
- Bassam Alkotaini
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia,
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187
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McCloskey AP, Gilmore BF, Laverty G. Evolution of antimicrobial peptides to self-assembled peptides for biomaterial applications. Pathogens 2014; 3:791-821. [PMID: 25436505 PMCID: PMC4282886 DOI: 10.3390/pathogens3040791] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 09/17/2014] [Accepted: 09/25/2014] [Indexed: 11/17/2022] Open
Abstract
Biomaterial-related infections are a persistent burden on patient health, recovery, mortality and healthcare budgets. Self-assembled antimicrobial peptides have evolved from the area of antimicrobial peptides. Peptides serve as important weapons in nature, and increasingly medicine, for combating microbial infection and biofilms. Self-assembled peptides harness a "bottom-up" approach, whereby the primary peptide sequence may be modified with natural and unnatural amino acids to produce an inherently antimicrobial hydrogel. Gelation may be tailored to occur in the presence of physiological and infective indicators (e.g. pH, enzymes) and therefore allow local, targeted antimicrobial therapy at the site of infection. Peptides demonstrate inherent biocompatibility, antimicrobial activity, biodegradability and numerous functional groups. They are therefore prime candidates for the production of polymeric molecules that have the potential to be conjugated to biomaterials with precision. Non-native chemistries and functional groups are easily incorporated into the peptide backbone allowing peptide hydrogels to be tailored to specific functional requirements. This article reviews an area of increasing interest, namely self-assembled peptides and their potential therapeutic applications as innovative hydrogels and biomaterials in the prevention of biofilm-related infection.
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Affiliation(s)
- Alice P McCloskey
- Biomaterials, Biofilm and Infection Control Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland.
| | - Brendan F Gilmore
- Biomaterials, Biofilm and Infection Control Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland.
| | - Garry Laverty
- Biomaterials, Biofilm and Infection Control Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland.
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188
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Lam HY, Gaarden RI, Li X. A Journey to the Total Synthesis of Daptomycin. CHEM REC 2014; 14:1086-99. [PMID: 25205345 DOI: 10.1002/tcr.201402049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Indexed: 01/14/2023]
Affiliation(s)
- Hiu Yung Lam
- Department of Chemistry; The University of Hong Kong; Hong Kong SAR P. R. China
| | | | - Xuechen Li
- Department of Chemistry; The University of Hong Kong; Hong Kong SAR P. R. China
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189
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Lohan S, Kalanta A, Sonkusre P, Cameotra SS, Bisht GS. Development of novel membrane active lipidated peptidomimetics active against drug resistant clinical isolates. Bioorg Med Chem 2014; 22:4544-52. [PMID: 25131957 DOI: 10.1016/j.bmc.2014.07.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 07/24/2014] [Accepted: 07/26/2014] [Indexed: 10/24/2022]
Abstract
A new series of small cationic lipidated peptidomimetics have been synthesized and found to be highly active against several susceptible as well as drug resistant clinical isolates of bacteria and fungi. All lipidated peptidomimetics do not cause significant lysis of human erythrocytes (HC50>200μg/mL). Calcein dye leakage experiment revealed membranolytic effect of LPEP08 which was further confirmed by scanning electron microscopy (SEM). The involvement of intracellular targets as an alternate mode of action was precluded by DNA retardation assay. Additionally, LPEP08 exhibit high proteolytic stability and dose not elicit resistance against drug resistant clinical isolate of Staphylococcusaureus, even after 16 rounds of passaging. These results demonstrate the potential of lipidated peptidomimetics as biocompatible anti-infective therapeutics.
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Affiliation(s)
- Sandeep Lohan
- Department of Pharmacy, Jaypee University of Information Technology, Solan 173234, India
| | - Arneesh Kalanta
- Department of Pharmacy, Jaypee University of Information Technology, Solan 173234, India
| | - Praveen Sonkusre
- Environmental Biotechnology & Microbial Biochemistry, Institute of Microbial Technology, Chandigarh 160036, India
| | - Swaranjit Singh Cameotra
- Environmental Biotechnology & Microbial Biochemistry, Institute of Microbial Technology, Chandigarh 160036, India
| | - Gopal Singh Bisht
- Department of Pharmacy, Jaypee University of Information Technology, Solan 173234, India.
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190
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Shaikh S, Fatima J, Shakil S, Rizvi SMD, Kamal MA. Antibiotic resistance and extended spectrum beta-lactamases: Types, epidemiology and treatment. Saudi J Biol Sci 2014; 22:90-101. [PMID: 25561890 DOI: 10.1016/j.sjbs.2014.08.002] [Citation(s) in RCA: 351] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 08/09/2014] [Accepted: 08/10/2014] [Indexed: 12/25/2022] Open
Abstract
Antibiotic resistance is a problem of deep scientific concern both in hospital and community settings. Rapid detection in clinical laboratories is essential for the judicious recognition of antimicrobial resistant organisms. Production of extended-spectrum β-lactamases (ESBLs) is a significant resistance-mechanism that impedes the antimicrobial treatment of infections caused by Enterobacteriaceae and is a serious threat to the currently available antibiotic armory. ESBLs are classified into several groups according to their amino acid sequence homology. Proper infection control practices and barriers are essential to prevent spread and outbreaks of ESBL producing bacteria. As bacteria have developed different strategies to counter the effects of antibiotics, the identification of the resistance mechanism may help in the discovery and design of new antimicrobial agents. The carbapenems are widely regarded as the drugs of choice for the treatment of severe infections caused by ESBL-producing Enterobacteriaceae, although comparative clinical trials are scarce. Hence, more expeditious diagnostic testing of ESBL-producing bacteria and the feasible modification of guidelines for community-onset bacteremia associated with different infections are prescribed.
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Affiliation(s)
| | - Jamale Fatima
- Department of Bio-engineering, Integral University, Lucknow 226026, India
| | - Shazi Shakil
- Department of Bio-engineering, Integral University, Lucknow 226026, India
| | | | - Mohammad Amjad Kamal
- King Fahd Medical Research Center, King Abdulaziz University, P.O. Box 80216, Jeddah 21589, Saudi Arabia ; Enzymoic, 7 Peterlee Pl, Hebersham, NSW 2770, Australia
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191
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Incorporation of exogenous fatty acids protects Enterococcus faecalis from membrane-damaging agents. Appl Environ Microbiol 2014; 80:6527-38. [PMID: 25128342 DOI: 10.1128/aem.02044-14] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Enterococcus faecalis is a commensal bacterium of the mammalian intestine that can persist in soil and aquatic systems and can be a nosocomial pathogen to humans. It employs multiple stress adaptation strategies in order to survive such a wide range of environments. Within this study, we sought to elucidate whether membrane fatty acid composition changes are an important component for stress adaptation. We noted that E. faecalis OG1RF was capable of changing its membrane composition depending upon growth phase and temperature. The organism also readily incorporated fatty acids from bile, serum, and medium supplemented with individual fatty acids, often dramatically changing the membrane composition such that a single fatty acid was predominant. Growth in either low levels of bile or specific individual fatty acids was found to protect the organism from membrane challenges such as high bile exposure. In particular, we observed that when grown in low levels of bile, serum, or the host-derived fatty acids oleic acid and linoleic acid, E. faecalis was better able to survive the antibiotic daptomycin. Interestingly, the degree of membrane saturation did not appear to be important for protection from the stressors examined here; instead, it appears that a specific fatty acid or combination of fatty acids is critical for stress resistance.
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192
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Chen YF, Sun TL, Sun Y, Huang HW. Interaction of daptomycin with lipid bilayers: a lipid extracting effect. Biochemistry 2014; 53:5384-92. [PMID: 25093761 PMCID: PMC4148140 DOI: 10.1021/bi500779g] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Daptomycin is the first approved member of a new structural class of antibiotics, the cyclic lipopeptides. The peptide interacts with the lipid matrix of cell membranes, inducing permeability of the membrane to ions, but its molecular mechanism has been a puzzle. Unlike the ubiquitous membrane-acting host-defense antimicrobial peptides, daptomycin does not induce pores in the cell membranes. Thus, how it affects the permeability of a membrane to ions is not clear. We studied its interaction with giant unilamellar vesicles (GUVs) and discovered a lipid-extracting phenomenon that correlates with the direct action of daptomycin on bacterial membranes observed in a recent fluorescence microscopy study. Lipid extraction occurred only when the GUV lipid composition included phosphatidylglycerol and in the presence of Ca(2+) ions, the same condition found to be necessary for daptomycin to be effective against bacteria. Furthermore, it occurred only when the peptide/lipid ratio exceeded a threshold value, which could be the basis of the minimal inhibitory concentration of daptomycin. In this first publication on the lipid extracting effect, we characterize its dependence on ions and lipid compositions. We also discuss possibilities for connecting the lipid extracting effect to the antibacterial activity of daptomycin.
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Affiliation(s)
- Yen-Fei Chen
- Department of Physics and Astronomy, Rice University , Houston, Texas 77005, United States
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193
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Sharma D, Mandal SM, Manhas RK. Purification and characterization of a novel lipopeptide from Streptomyces amritsarensis sp. nov. active against methicillin-resistant Staphylococcus aureus. AMB Express 2014; 4:50. [PMID: 25006539 PMCID: PMC4077001 DOI: 10.1186/s13568-014-0050-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 05/27/2014] [Indexed: 11/28/2022] Open
Abstract
Nowadays antimicrobial lipopeptides are being widely exploited for developing potential therapeutic agents for treating bacterial infections. In the present study, we have purified and characterized an antimicrobial lipopeptide produced by Streptomyces amritsarensis sp. nov. (= MTCC 11845(T) = JCM 19660(T)). The lipopeptide was purified using silica gel chromatography, size exclusion chromatography and reverse phase- HPLC. The MS/MS analysis of the lipopeptide revealed that it has amino acid sequence as Ala-Thr-Gly-Ser-His-Gln and a long chain fatty acid tail with six times repeated the molecular mass of 161 Da which is corresponding to -C12H19. Based on the molecular mass (878.5 Da) and amino acid composition, the lipopeptide was identified as a novel lipopeptide. The MIC values of purified lipopeptide against Bacillus subtilis (MTCC 619), Staphylococcus epidermidis (MTCC 435), Mycobacterium smegmatis (MTCC 6) and clinical strain, Methicillin Resistant Staphylococcus aureus (MRSA) were found to be 10, 15, 25 and 45 μg/ml, respectively. It was completely stable at 70°C for 1 h and retained 81.8% activity after autoclaving (121°C for 15 min). It did not show any change in its activity profile between pH 5.0 - 9.0 and is stable to trypsin, proteinase K and lipase enzymes. It was found to be non-mutagenic against Salmonella typhimurium (TA98) and did not show cytotoxicity when checked against Chinese hamster ovary (CHO) cell line. In addition to antibacterial activity it also exhibits biosurfactant activity.
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Affiliation(s)
- Deepika Sharma
- Department of Microbiology, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Santi M Mandal
- Central Research Facility, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Rajesh Kumari Manhas
- Department of Microbiology, Guru Nanak Dev University, Amritsar 143005, Punjab, India
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194
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Winfred SB, Meiyazagan G, Panda JJ, Nagendrababu V, Deivanayagam K, Chauhan VS, Venkatraman G. Antimicrobial activity of cationic peptides in endodontic procedures. Eur J Dent 2014; 8:254-260. [PMID: 24966779 PMCID: PMC4054059 DOI: 10.4103/1305-7456.130626] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
OBJECTIVES The present study aimed to investigate the antimicrobial and biofilm inhibition activity of synthetic antimicrobial peptides (AMPs) against microbes such as Enterococcus faecalis, Staphylococcus aureus, and Candida albicans which are involved in endodontic infections. MATERIALS AND METHODS Agar diffusion test was done to determine the activity of peptides. The morphological changes in E. faecalis and reduction in biofilm formation after treatment with peptides were observed using scanning electron microscope. The efficacy of peptides using an ex vivo dentinal model was determined by polymerase chain reaction and confocal laser scanning microscopy. Platelet aggregation was done to determine the biocompatibility of peptides. RESULTS Among 11 peptides, two of the amphipathic cationic peptides were found to be highly active against E. faecalis, S. aureus, C. albicans. Efficacy results using dentinal tubule model showed significant reduction in microbial load at 400 μm depth. The peptides were also biocompatible. CONCLUSION These results suggest that synthetic AMPs have the potential to be developed as antibacterial agents against microorganisms involved in dental infections and thus could prevent the spread and persistence of endodontic infections improving treatment outcomes and teeth preservation.
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Affiliation(s)
- Sofi Beaula Winfred
- Department of Human Genetics, Sri Ramachandra University, Porur, Chennai, Tamil Nadu, India
| | - Gowri Meiyazagan
- Department of Human Genetics, Sri Ramachandra University, Porur, Chennai, Tamil Nadu, India
| | - Jiban J Panda
- Malaria Research Laboratory, International Center for Genetic Engineering and Biotechnology, New Delhi, India
| | - Venkateshbabu Nagendrababu
- Department of Conservative Dentistry, Faculty of Dental Science, Sri Ramachandra University, Porur, Chennai, Tamil Nadu, India
| | - Kandaswamy Deivanayagam
- Department of Conservative Dentistry, Faculty of Dental Science, Sri Ramachandra University, Porur, Chennai, Tamil Nadu, India
| | - Virander S Chauhan
- Malaria Research Laboratory, International Center for Genetic Engineering and Biotechnology, New Delhi, India
| | - Ganesh Venkatraman
- Department of Human Genetics, Sri Ramachandra University, Porur, Chennai, Tamil Nadu, India
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195
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Defining daptomycin resistance prevention exposures in vancomycin-resistant Enterococcus faecium and E. faecalis. Antimicrob Agents Chemother 2014; 58:5253-61. [PMID: 24957825 DOI: 10.1128/aac.00098-14] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Daptomycin is used off-label for enterococcal infections; however, dosing targets for resistance prevention remain undefined. Doses of 4 to 6 mg/kg of body weight/day approved for staphylococci are likely inadequate against enterococci due to reduced susceptibility. We modeled daptomycin regimens in vitro to determine the minimum exposure to prevent daptomycin resistance (Dapr) in enterococci. Daptomycin simulations of 4 to 12 mg/kg/day (maximum concentration of drug in serum [Cmax] of 57.8, 93.9, 123.3, 141.1, and 183.7 mg/liter; half-life [t1/2] of 8 h) were tested against one Enterococcus faecium strain (S447) and one Enterococcus faecalis strain (S613) in a simulated endocardial vegetation pharmacokinetic/pharmacodynamic model over 14 days. Samples were plated on media containing 3× the MIC of daptomycin to detect Dapr. Mutations in genes encoding proteins associated with cell envelope homeostasis (yycFG and liaFSR) and phospholipid metabolism (cardiolipin synthase [cls] and cyclopropane fatty acid synthetase [cfa]) were investigated in Dapr derivatives. Dapr derivatives were assessed for changes in susceptibility, surface charge, membrane depolarization, cell wall thickness (CWT), and growth rate. Strains S447 and S613 developed Dapr after simulations of 4 to 8 mg/kg/day but not 10 to 12 mg/kg/day. MICs for Dapr strains ranged from 8 to 256 mg/liter. Some S613 derivatives developed mutations in liaF or cls. S447 derivatives lacked mutations in these genes. Dapr derivatives from both strains exhibited lowered growth rates, up to a 72% reduction in daptomycin-induced depolarization and up to 6-nm increases in CWT (P<0.01). Peak/MIC and AUC0-24/MIC ratios (AUC0-24 is the area under the concentration-time curve from 0 to 24 h) associated with Dapr prevention were 72.1 and 780 for S447 and 144 and 1561 for S613, respectively. Daptomycin doses of 10 mg/kg/day may be required to prevent Dapr in serious enterococcal infections.
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196
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Lohan S, Monga J, Cameotra SS, Bisht GS. In vitro and in vivo antibacterial evaluation and mechanistic study of ornithine based small cationic lipopeptides against antibiotic resistant clinical isolates. Eur J Med Chem 2014; 88:19-27. [PMID: 24961161 DOI: 10.1016/j.ejmech.2014.06.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 06/16/2014] [Accepted: 06/18/2014] [Indexed: 11/28/2022]
Abstract
We investigated the in vitro activities of short lipopeptides against a large panel of clinical isolates of antibiotic resistant bacteria. In the animal model, LP16 (5 mg/kg) significantly decreased the burden of viable colony forming unit (CFU) of bacteria. MTT assay results revealed the high selectivity of lipopeptides toward microbial cells. Calcein dye leakage experiments and flow cytometric analysis suggests the membranolytic effect of lipopeptides, which was further confirmed by visualizing bacterial damage via electron microscopy tool (SEM & TEM). Moreover, stability in human blood plasma and no sign of resistance development against clinical isolates of Escherichia coli and Staphylococcus aureus were observed for lead lipopeptides. These results demonstrate the potential of short lipopeptides as a novel class of anti-infectives.
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Affiliation(s)
- Sandeep Lohan
- Department of Pharmacy, Jaypee University of Information Technology, Solan 173234, India
| | - Jitender Monga
- Department of Urology, Postgraduate Institute of Medical Education and Research, Chandigarh 160012, India
| | - Swaranjit Singh Cameotra
- Environmental Biotechnology & Microbial Biochemistry, Institute of Microbial Technology, Chandigarh 160036, India
| | - Gopal Singh Bisht
- Department of Pharmacy, Jaypee University of Information Technology, Solan 173234, India.
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197
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Comparative mechanistic studies of brilacidin, daptomycin, and the antimicrobial peptide LL16. Antimicrob Agents Chemother 2014; 58:5136-45. [PMID: 24936592 DOI: 10.1128/aac.02955-14] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Brilacidin (PMX30063) has shown potent bactericidal activity against drug-resistant and -susceptible strains of multiple Gram-negative and Gram-positive pathogens. In this study, we demonstrate that brilacidin causes membrane depolarization in the Gram-positive bacterium Staphylococcus aureus, to an extent comparable to that caused by the lipopeptidic drug daptomycin. Transcriptional profiling of Staphylococcus aureus by deep sequencing shows that the global response to brilacidin treatment is well correlated to those of treatment with daptomycin and the cationic antimicrobial peptide LL37 and mostly indicates abrogation of cell wall and membrane functions. Furthermore, the upregulation of various chaperones and proteases by brilacidin and daptomycin indicates that cytoplasmic protein misfolding stress may be a contributor to the mechanism of action of these drugs. These stress responses were orchestrated mainly by three two-component systems, GraSR, VraSR, and NsaSR, which have been implicated in virulence and drug resistance against other clinically available antibiotics.
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198
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Vilà S, Badosa E, Montesinos E, Feliu L, Planas M. A convenient solid-phase strategy for the synthesis of antimicrobial cyclic lipopeptides. Org Biomol Chem 2014; 11:3365-74. [PMID: 23563492 DOI: 10.1039/c3ob40319j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A concise solid-phase synthesis of cyclic lipopeptides derived from the antimicrobial peptide c(Lys-Lys-Leu-Lys-Lys-Phe-Lys-Lys-Leu-Gln) (BPC194) was accomplished. Three different synthetic routes were explored. Best results were obtained using a protocol that includes as key steps: (i) synthesis of the cyclic peptidyl resin incorporating the Lys residue to be acylated protected at the N(ε)-amino group with an ivDde group, (ii) selective removal of the ivDde group, and (iii) acylation. These compounds were screened for their in vitro growth inhibition of bacterial and fungal phytopathogens and for their cytotoxic effects on eukaryotic cells. A sequence with high antimicrobial activity and low hemolysis was identified, constituting a good candidate for the design of new antimicrobial agents.
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Affiliation(s)
- Sílvia Vilà
- Laboratori d'Innovació en Processos i Productes de Síntesi Orgànica (LIPPSO), Departament de Química, Universitat de Girona, Girona, Spain
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199
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Barber KE, Werth BJ, McRoberts JP, Rybak MJ. A novel approach utilizing biofilm time-kill curves to assess the bactericidal activity of ceftaroline combinations against biofilm-producing methicillin-resistant Staphylococcus aureus. Antimicrob Agents Chemother 2014; 58:2989-92. [PMID: 24614378 PMCID: PMC3993275 DOI: 10.1128/aac.02764-13] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 03/01/2014] [Indexed: 12/13/2022] Open
Abstract
Medical device infections frequently require combination therapy. Beta-lactams combined with glycopeptides/lipopeptides are bactericidal against methicillin-resistant Staphylococcus aureus (MRSA). Novel macrowell kill-curve methods tested synergy between ceftaroline or cefazolin plus daptomycin, vancomycin, or rifampin against biofilm-producing MRSA. Ceftaroline combinations demonstrated the most pronounced bacterial reductions. Ceftaroline demonstrated greatest kill with daptomycin (4.02 ± 0.59 log10 CFU/cm(2)), compared to combination with vancomycin (3.36 ± 0.35 log10 CFU/cm(2)) or rifampin (2.68 ± 0.61 log10 CFU/cm(2)). These data suggest that beta-lactam combinations are useful against MRSA biofilms.
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Affiliation(s)
- Katie E. Barber
- Anti-Infective Research Laboratory, Eugene Applebaum College of Pharmacy and Health Sciences, School of Medicine, Wayne State University, Detroit, Michigan, USA
| | - Brian J. Werth
- Anti-Infective Research Laboratory, Eugene Applebaum College of Pharmacy and Health Sciences, School of Medicine, Wayne State University, Detroit, Michigan, USA
| | - John P. McRoberts
- Anti-Infective Research Laboratory, Eugene Applebaum College of Pharmacy and Health Sciences, School of Medicine, Wayne State University, Detroit, Michigan, USA
| | - Michael J. Rybak
- Anti-Infective Research Laboratory, Eugene Applebaum College of Pharmacy and Health Sciences, School of Medicine, Wayne State University, Detroit, Michigan, USA
- John D. Dingell Veterans Affairs Medical Center, Detroit, Michigan, USA
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200
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Rincón S, Panesso D, Díaz L, Carvajal LP, Reyes J, Munita JM, Arias CA. [Resistance to "last resort" antibiotics in Gram-positive cocci: The post-vancomycin era]. BIOMEDICA : REVISTA DEL INSTITUTO NACIONAL DE SALUD 2014; 34 Suppl 1:191-208. [PMID: 24968051 PMCID: PMC4435674 DOI: 10.1590/s0120-41572014000500022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 01/31/2014] [Indexed: 06/03/2023]
Abstract
New therapeutic alternatives have been developed in the last years for the treatment of multidrug-resistant Gram-positive infections. Infections caused by methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE) are considered a therapeutic challenge due to failures and lack of reliable antimicrobial options. Despite concerns related to the use of vancomycin in the treatment of severe MRSA infections in specific clinical scenarios, there is a paucity of solid clinical evidence that support the use of alternative agents (when compared to vancomycin). Linezolid, daptomycin and tigecycline are antibiotics approved in the last decade and newer cephalosporins (such as ceftaroline and ceftobiprole) and novel glycopeptides (dalvavancin, telavancin and oritavancin) have reached clinical approval or are in the late stages of clinical development. This review focuses on discussing these newer antibiotics used in the "post-vancomycin" era with emphasis on relevant chemical characteristics, spectrum of antimicrobial activity, mechanisms of action and resistance, as well as their clinical utility.
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Affiliation(s)
- Sandra Rincón
- Unidad de Genética y Resistencia Antimicrobiana (UGRA), Universidad El Bosque, Bogotá, D.C., Colombia
| | - Diana Panesso
- Unidad de Genética y Resistencia Antimicrobiana (UGRA), Universidad El Bosque, Bogotá, D.C., Colombia
- University of Texas Medical School at Houston, Houston, TX, USA
| | - Lorena Díaz
- Unidad de Genética y Resistencia Antimicrobiana (UGRA), Universidad El Bosque, Bogotá, D.C., Colombia
| | - Lina P. Carvajal
- Unidad de Genética y Resistencia Antimicrobiana (UGRA), Universidad El Bosque, Bogotá, D.C., Colombia
| | - Jinnethe Reyes
- Unidad de Genética y Resistencia Antimicrobiana (UGRA), Universidad El Bosque, Bogotá, D.C., Colombia
- University of Texas Medical School at Houston, Houston, TX, USA
| | - José M. Munita
- University of Texas Medical School at Houston, Houston, TX, USA
- Clínica Alemana de Santiago, Universidad del Desarrollo, Santiago de Chile, Chile
| | - César A. Arias
- Unidad de Genética y Resistencia Antimicrobiana (UGRA), Universidad El Bosque, Bogotá, D.C., Colombia
- University of Texas Medical School at Houston, Houston, TX, USA
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