1
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García-Gros J, Cajal Y, Marqués AM, Rabanal F. Synthesis of the Antimicrobial Peptide Murepavadin Using Novel Coupling Agents. Biomolecules 2024; 14:526. [PMID: 38785933 PMCID: PMC11117477 DOI: 10.3390/biom14050526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 04/18/2024] [Accepted: 04/23/2024] [Indexed: 05/25/2024] Open
Abstract
The problem of antimicrobial resistance is becoming a daunting challenge for human society and healthcare systems around the world. Hence, there is a constant need to develop new antibiotics to fight resistant bacteria, among other important social and economic measures. In this regard, murepavadin is a cyclic antibacterial peptide in development. The synthesis of murepavadin was undertaken in order to optimize the preparative protocol and scale-up, in particular, the use of new activation reagents. In our hands, classical approaches using carbodiimide/hydroxybenzotriazole rendered low yields. The use of novel carbodiimide and reagents based on OxymaPure® and Oxy-B is discussed together with the proper use of chromatographic conditions for the adequate characterization of peptide crudes. Higher yields and purities were obtained. Finally, the antimicrobial activity of different synthetic batches was tested in three Pseudomonas aeruginosa strains, including highly resistant ones. All murepavadin batches yielded the same highly active MIC values and proved that the chiral integrity of the molecule was preserved throughout the whole synthetic procedure.
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Affiliation(s)
- Júlia García-Gros
- Section of Organic Chemistry, Department of Inorganic and Organic Chemistry, Faculty of Chemistry, Universitat de Barcelona, 08028 Barcelona, Spain;
| | - Yolanda Cajal
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, Universitat de Barcelona, 08028 Barcelona, Spain;
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Ana Maria Marqués
- Laboratory of Microbiology, Faculty of Pharmacy and Food Sciences, Universitat de Barcelona, 08007 Barcelona, Spain;
| | - Francesc Rabanal
- Section of Organic Chemistry, Department of Inorganic and Organic Chemistry, Faculty of Chemistry, Universitat de Barcelona, 08028 Barcelona, Spain;
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2
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Segovia R, Díaz-Lobo M, Cajal Y, Vilaseca M, Rabanal F. Linker-Free Synthesis of Antimicrobial Peptides Using a Novel Cleavage Reagent: Characterisation of the Molecular and Ionic Composition by nanoESI-HR MS. Pharmaceutics 2023; 15:pharmaceutics15041310. [PMID: 37111798 PMCID: PMC10141159 DOI: 10.3390/pharmaceutics15041310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
The efficient preparation of novel bioactive peptide drugs requires the availability of reliable and accessible chemical methodologies together with suitable analytical techniques for the full characterisation of the synthesised compounds. Herein, we describe a novel acidolytic method with application to the synthesis of cyclic and linear peptides involving benzyl-type protection. The process consists of the in situ generation of anhydrous hydrogen bromide and a trialkylsilyl bromide that acts as protic and Lewis acid reagents. This method proved to be useful to effectively remove benzyl-type protecting groups and cleave Fmoc/tBu assembled peptides directly attached to 4-methylbenzhydrylamine (MBHA) resins with no need for using mild trifluoroacetic acid labile linkers. The novel methodology was successful in synthesising three antimicrobial peptides, including the cyclic compound polymyxin B3, dusquetide, and RR4 heptapeptide. Furthermore, electrospray mass spectrometry (ESI-MS) is successfully used for the full characterisation of both the molecular and ionic composition of the synthetic peptides.
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Affiliation(s)
- Roser Segovia
- Section of Organic Chemistry, Department of Inorganic and Organic Chemistry, Faculty of Chemistry, Universitat de Barcelona, 08028 Barcelona, Spain
| | - Mireia Díaz-Lobo
- Institute for Research in Biomedicine (IRB Barcelona), BIST (The Barcelona Institute of Science and Technology), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Yolanda Cajal
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, Universitat de Barcelona, 08028 Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Marta Vilaseca
- Institute for Research in Biomedicine (IRB Barcelona), BIST (The Barcelona Institute of Science and Technology), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Francesc Rabanal
- Section of Organic Chemistry, Department of Inorganic and Organic Chemistry, Faculty of Chemistry, Universitat de Barcelona, 08028 Barcelona, Spain
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3
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Lipid Microenvironment Modulates the Pore-Forming Ability of Polymyxin B. Antibiotics (Basel) 2022; 11:antibiotics11101445. [PMID: 36290103 PMCID: PMC9598075 DOI: 10.3390/antibiotics11101445] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 11/17/2022] Open
Abstract
The ability of polymyxin B, an antibiotic used to treat infections caused by multidrug-resistant Gram-negative bacteria as a last-line therapeutic option, to form ion pores in model membranes composed of various phospholipids and lipopolysaccharides was studied. Our data demonstrate that polymyxin B predominantly interacts with negatively charged lipids. Susceptibility decreases as follows: Kdo2-Lipid A >> DOPG ≈ DOPS >> DPhPG ≈ TOCL ≈ Lipid A. The dimer and hexamer of polymyxin B are involved in the pore formation in DOPG(DOPS)- and Kdo2-Lipid A-enriched bilayers, respectively. The pore-forming ability of polymyxin B significantly depends on the shape of membrane lipids, which indicates that the antibiotic produces toroidal lipopeptide-lipid pores. Small amphiphilic molecules diminishing the membrane dipole potential and inducing positive curvature stress were shown to be agonists of pore formation by polymyxin B and might be used to develop innovative lipopeptide-based formulations.
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Mammari N, Salles E, Beaussart A, El-Kirat-Chatel S, Varbanov M. Squalamine and Its Aminosterol Derivatives: Overview of Biological Effects and Mechanisms of Action of Compounds with Multiple Therapeutic Applications. Microorganisms 2022; 10:microorganisms10061205. [PMID: 35744723 PMCID: PMC9229800 DOI: 10.3390/microorganisms10061205] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 05/30/2022] [Accepted: 06/07/2022] [Indexed: 02/04/2023] Open
Abstract
Squalamine is a natural aminosterol that has been discovered in the tissues of the dogfish shark (Squalus acanthias). Studies have previously demonstrated that this promoter compound and its derivatives exhibit potent bactericidal activity against Gram-negative, Gram-positive bacteria, and multidrug-resistant bacteria. The antibacterial activity of squalamine was found to correlate with that of other antibiotics, such as colistin and polymyxins. Still, in the field of microbiology, evidence has shown that squalamine and its derivatives have antifungal activity, antiprotozoa effect against a limited list of protozoa, and could exhibit antiviral activity against both RNA- and DNA-enveloped viruses. Furthermore, squalamine and its derivatives have been identified as being antiangiogenic compounds in the case of several types of cancers and induce a potential positive effect in the case of other diseases such as experimental retinopathy and Parkinson's disease. Given the diverse effects of the squalamine and its derivatives, in this review we provide the different advances in our understanding of the various effects of these promising molecules and try to draw up a non-exhaustive list of the different mechanisms of actions of squalamine and its derivatives on the human organism and on different pathogens.
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Affiliation(s)
- Nour Mammari
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (N.M.); (E.S.)
| | - Elsa Salles
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (N.M.); (E.S.)
| | | | | | - Mihayl Varbanov
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (N.M.); (E.S.)
- Laboratoire de Virologie, CHRU de Nancy Brabois, F-54500 Vandœuvre-lès-Nancy, France
- Correspondence:
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5
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Shi S, Markl AM, Lu Z, Liu R, Hoernke M. Interplay of Fusion, Leakage, and Electrostatic Lipid Clustering: Membrane Perturbations by a Hydrophobic Antimicrobial Polycation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2379-2391. [PMID: 35148117 DOI: 10.1021/acs.langmuir.1c03445] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Membrane active compounds are able to induce various types of membrane perturbations. Natural or biomimetic candidates for antimicrobial treatment or drug delivery scenarios are mostly designed and tested for their ability to induce membrane permeabilization, also termed leakage. Furthermore, the interaction of these usually cationic amphiphiles with negatively charged vesicles often causes colloidal instability leading to vesicle aggregation or/and vesicle fusion. We show the interplay of these modes of membrane perturbation in mixed phosphatidyl glycerol (PG)/phosphatidyl ethanolamine (PE) by the statistical copolymer MM:CO comprising, both, charged and hydrophobic subunits. MM:CO is a representative of partially hydrophobic, highly active, but less selective antimicrobial polycations. Cryo-electron microscopy indicates vesicle fusion rather than vesicle aggregation upon the addition of MM:CO to negatively charged PG/PE (1:1) vesicles. In a combination of fluorescence-based leakage and fusion assays, there is support for membrane permeabilization and pronounced vesicle fusion activity as distinct effects. To this end, membrane fusion and aggregation were prevented by including lipids with polyethylene glycol attached to their head groups (PEG-lipids). The leakage activity of MM:CO is very similar in the absence and presence of PEG-lipids. Vesicle aggregation and fusion however are largely suppressed. This strongly suggests that MM:CO induces leakage by asymmetric packing stress because of hydrophobically driven interactions which could lead to leakage. As a further membrane perturbation effect, MM:CO causes lipid clustering in model vesicles. We address potential artifacts and misinterpretations of experiments characterizing leakage and fusion. Additional to the leakage activity, the pronounced fusogenic activity of the polymer and potentially of many other similar compounds likely has implications for antimicrobial activity and beyond.
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Affiliation(s)
- Shuai Shi
- Chemistry and Pharmacy, Albert-Ludwigs-Universität, 79104 Freiburg i.Br., Germany
| | - Anja Madleine Markl
- Chemistry and Pharmacy, Albert-Ludwigs-Universität, 79104 Freiburg i.Br., Germany
| | - Ziyi Lu
- State Key Laboratory of Bioreactor Engineering, Key Laboratory for Ultrafine Materials of Ministry of Education, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Research Center for Biomedical Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Runhui Liu
- State Key Laboratory of Bioreactor Engineering, Key Laboratory for Ultrafine Materials of Ministry of Education, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Research Center for Biomedical Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Maria Hoernke
- Chemistry and Pharmacy, Albert-Ludwigs-Universität, 79104 Freiburg i.Br., Germany
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6
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In Silico Discovery of Novel Ligands for Antimicrobial Lipopeptides for Computer-Aided Drug Design. Probiotics Antimicrob Proteins 2019; 10:129-141. [PMID: 29218506 DOI: 10.1007/s12602-017-9356-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The increase in antibiotic-resistant strains of pathogens has created havoc worldwide. These antibiotic-resistant pathogens require potent drugs for their inhibition. Lipopeptides, which are produced as secondary metabolites by many microorganisms, have the ability to act as potent safe drugs. Lipopeptides are amphiphilic molecules containing a lipid chain bound to the peptide. They exhibit broad-spectrum activities against both bacteria and fungi. Other than their antimicrobial properties, they have displayed anti-cancer properties as well, but their mechanism of action is not understood. In silico drug design uses computer simulation to discover and develop new drugs. This technique reduces the need of expensive and tedious lab work and clinical trials, but this method becomes a challenge due to complex structures of lipopeptides. Specific agonists (ligands) must be identified to initiate a physiological response when combined with a receptor (lipopeptide). In silico drug design and homology modeling talks about the interaction between ligands and the binding sites. This review summarizes the mechanism of selected lipopeptides, their respective ligands, and in silico drug design.
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7
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Rabanal F, Cajal Y. Recent advances and perspectives in the design and development of polymyxins. Nat Prod Rep 2017. [PMID: 28628170 DOI: 10.1039/c7np00023e] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Covering: 1947-early 2017, particularly from 2005-early 2017The rise of bacterial pathogens with acquired resistance to almost all available antibiotics is becoming a serious public health issue. Polymyxins, antibiotics that were mostly abandoned a few decades ago because of toxicity concerns, are ultimately considered as a last-line therapy to treat infections caused by multi-drug resistant Gram-negative bacteria. This review surveys the progress in understanding polymyxin structure, and their chemistry, mechanisms of antibacterial activity and nephrotoxicity, biomarkers, synergy and combination with other antimicrobial agents and antibiofilm properties. An update of recent efforts in the design and development of a new generation of polymyxin drugs is also discussed. A novel approach considering the modification of the scaffold of polymyxins to integrate metabolism and detoxification issues into the drug design process is a promising new line to potentially prevent accumulation in the kidneys and reduce nephrotoxicity.
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Affiliation(s)
- Francesc Rabanal
- Organic Chemistry Section, Department of Inorganic and Organic Chemistry, Faculty of Chemistry, University of Barcelona, Spain.
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8
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Hanna SL, Huang JL, Swinton AJ, Caputo GA, Vaden TD. Synergistic effects of polymyxin and ionic liquids on lipid vesicle membrane stability and aggregation. Biophys Chem 2017; 227:1-7. [PMID: 28526567 DOI: 10.1016/j.bpc.2017.05.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 05/04/2017] [Accepted: 05/06/2017] [Indexed: 12/12/2022]
Abstract
Ionic liquids (ILs) have been investigated for potential antibacterial and antibiotic applications due to their ability to destabilize and permeabilize the lipid bilayers in cell membranes. Bacterial assays have shown that combining ILs with antibiotics can provide a synergistic enhancement of their antibacterial activities. We have characterized the mechanism by which the conventional ILs 1-butyl-3-methylimidazolium chloride (BMICl) and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4) enhance the lipid membrane permeabilization of the well-known antibiotic polymyxin B (PMB). We studied the sizes and membrane permeabilities of multilamellar and unilamellar lipid bilayer vesicles in the presence of ILs alone in aqueous solution, PMB alone, and ILs combined together with PMB. Light scattering-based experiments show that vesicle sizes dramatically increase when ILs are combined with PMB, which suggests that the materials combine to synergistically enhance lipid membrane disruption leading to vesicle aggregation. Lipid bilayer leakage experiments using tris (2,2'-bipyridyl) ruthenium (II) (Ru(bpy)32+) trapped in lipid vesicles, in which the trapped Ru(bpy)32+ fluorescence lifetime increases when it leaks out of the vesicle, show that combining BMIBF4 and PMB together permeabilize the membrane significantly more than with PMB or the IL alone. This demonstrates that ILs can assist in antibiotic permeabilization of lipid bilayers which could explain the increased antibiotic activities in the presence of ILs in solution.
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Affiliation(s)
- Sylvia L Hanna
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Jenny L Huang
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Alana J Swinton
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Gregory A Caputo
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States; Department of Biomedical and Translational Sciences, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States
| | - Timothy D Vaden
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States.
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9
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Kuan SL, Wang T, Raabe M, Liu W, Lamla M, Weil T. Programming Bioactive Architectures with Cyclic Peptide Amphiphiles. Chempluschem 2015; 80:1347-1353. [PMID: 31973290 DOI: 10.1002/cplu.201500218] [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: 05/09/2015] [Indexed: 01/06/2023]
Abstract
We present a versatile approach for the synthesis of cyclic peptide amphiphiles of the hormone somatostatin (SST) with tunable lipophilic tails to program bioactive nanoarchitectures. A novel bis-alkylation reagent is synthesized that facilitates the functionalization of SST with a thiol anchor. Different hydrophobic moieties are introduced inspired by a biomimetic palmitoylation approach which opens access to cyclic peptide amphiphiles that display rich self-organization and cell membrane interactions.
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Affiliation(s)
- Seah Ling Kuan
- Institute of Organic Chemistry III-Macromolecular Chemistry & Biomaterials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm (Germany)
| | - Tao Wang
- Institute of Organic Chemistry III-Macromolecular Chemistry & Biomaterials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm (Germany)
| | - Marco Raabe
- Institute of Organic Chemistry III-Macromolecular Chemistry & Biomaterials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm (Germany)
| | - Weina Liu
- Institute of Organic Chemistry III-Macromolecular Chemistry & Biomaterials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm (Germany)
| | - Markus Lamla
- Institute of Organic Chemistry III-Macromolecular Chemistry & Biomaterials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm (Germany)
| | - Tanja Weil
- Institute of Organic Chemistry III-Macromolecular Chemistry & Biomaterials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm (Germany)
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10
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Antibacterial mechanisms of polymyxin and bacterial resistance. BIOMED RESEARCH INTERNATIONAL 2015; 2015:679109. [PMID: 25664322 PMCID: PMC4312571 DOI: 10.1155/2015/679109] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 11/10/2014] [Indexed: 11/18/2022]
Abstract
Multidrug resistance in pathogens is an increasingly significant threat for human health. Indeed, some strains are resistant to almost all currently available antibiotics, leaving very limited choices for antimicrobial clinical therapy. In many such cases, polymyxins are the last option available, although their use increases the risk of developing resistant strains. This review mainly aims to discuss advances in unraveling the mechanisms of antibacterial activity of polymyxins and bacterial tolerance together with the description of polymyxin structure, synthesis, and structural modification. These are expected to help researchers not only develop a series of new polymyxin derivatives necessary for future medical care, but also optimize the clinical use of polymyxins with minimal resistance development.
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11
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Magee TV, Brown MF, Starr JT, Ackley DC, Abramite JA, Aubrecht J, Butler A, Crandon JL, Dib-Hajj F, Flanagan ME, Granskog K, Hardink JR, Huband MD, Irvine R, Kuhn M, Leach KL, Li B, Lin J, Luke DR, MacVane SH, Miller AA, McCurdy S, McKim JM, Nicolau DP, Nguyen TT, Noe MC, O’Donnell JP, Seibel SB, Shen Y, Stepan AF, Tomaras AP, Wilga PC, Zhang L, Xu J, Chen JM. Discovery of Dap-3 Polymyxin Analogues for the Treatment of Multidrug-Resistant Gram-Negative Nosocomial Infections. J Med Chem 2013; 56:5079-93. [DOI: 10.1021/jm400416u] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Thomas V. Magee
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Matthew F. Brown
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Jeremy T. Starr
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - David C. Ackley
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Joseph A. Abramite
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Jiri Aubrecht
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Andrew Butler
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Jared L. Crandon
- Center
for Anti-Infective Research
and Development, Hartford Hospital, Hartford,
Connecticut 06102, United States
| | - Fadia Dib-Hajj
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Mark E. Flanagan
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Karl Granskog
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Joel R. Hardink
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Michael D. Huband
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Rebecca Irvine
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Michael Kuhn
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Karen L. Leach
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Bryan Li
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Jian Lin
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - David R. Luke
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Shawn H. MacVane
- Center
for Anti-Infective Research
and Development, Hartford Hospital, Hartford,
Connecticut 06102, United States
| | - Alita A. Miller
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Sandra McCurdy
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | | | - David P. Nicolau
- Center
for Anti-Infective Research
and Development, Hartford Hospital, Hartford,
Connecticut 06102, United States
| | - Thuy-Trinh Nguyen
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Mark C. Noe
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - John P. O’Donnell
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Scott B. Seibel
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Yue Shen
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Antonia F. Stepan
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Andrew P. Tomaras
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
| | - Paul C. Wilga
- CeeTox, Inc., Kalamazoo, Michigan 49008,
United States
| | - Li Zhang
- WuXi AppTech Co., Ltd., Shanghai, P.R. China
| | | | - Jinshan Michael Chen
- Pfizer Worldwide Research & Development, Pfizer, Inc., Groton, Connecticut 06340, United States
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12
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Gannabathula S, Skinner MA, Rosendale D, Greenwood JM, Mutukumira AN, Steinhorn G, Stephens J, Krissansen GW, Schlothauer RC. Arabinogalactan proteins contribute to the immunostimulatory properties of New Zealand honeys. Immunopharmacol Immunotoxicol 2012; 34:598-607. [DOI: 10.3109/08923973.2011.641974] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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13
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Cheng C, Liu S, Xiao D, Hollembaek J, Yao L, Lin J, Hansel S. LC–MS/MS method development and validation for the determination of polymyxins and vancomycin in rat plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:2831-8. [DOI: 10.1016/j.jchromb.2010.08.037] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 08/23/2010] [Accepted: 08/23/2010] [Indexed: 10/19/2022]
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14
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Velkov T, Thompson PE, Nation RL, Li J. Structure--activity relationships of polymyxin antibiotics. J Med Chem 2010; 53:1898-916. [PMID: 19874036 DOI: 10.1021/jm900999h] [Citation(s) in RCA: 531] [Impact Index Per Article: 37.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Tony Velkov
- School of Medicine, Deakin University, Pigdons Road, Geelong 3217, Victoria, Australia.
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15
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Biophysical studies of the interaction of squalamine and other cationic amphiphilic molecules with bacterial and eukaryotic membranes: importance of the distribution coefficient in membrane selectivity. Chem Phys Lipids 2010; 163:131-40. [DOI: 10.1016/j.chemphyslip.2009.10.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Revised: 09/05/2009] [Accepted: 10/21/2009] [Indexed: 11/21/2022]
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16
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Tatsis VA, Tsoulos IG, Krinas CS, Alexopoulos C, Stavrakoudis A. Insights into the structure of the PmrD protein with molecular dynamics simulations. Int J Biol Macromol 2009; 44:393-9. [DOI: 10.1016/j.ijbiomac.2009.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2008] [Revised: 02/24/2009] [Accepted: 02/25/2009] [Indexed: 01/19/2023]
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17
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Pérez-López S, Vila-Romeu N, Alsina Esteller MA, Espina M, Haro I, Mestres C. Interaction of GB Virus C/Hepatitis G Virus Synthetic Peptides with Lipid Langmuir Monolayers and Large Unilamellar Vesicles. J Phys Chem B 2008; 113:319-27. [DOI: 10.1021/jp806938y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Silvia Pérez-López
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Nuria Vila-Romeu
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - M. Asunción Alsina Esteller
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Marta Espina
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Isabel Haro
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Concepció Mestres
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
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18
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Hilpert K, Fjell CD, Cherkasov A. Short linear cationic antimicrobial peptides: screening, optimizing, and prediction. Methods Mol Biol 2008; 494:127-159. [PMID: 18726572 DOI: 10.1007/978-1-59745-419-3_8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The problem of pathogenic antibiotic-resistant bacteria such as Staphylococcus aureus and Pseudomonas aeruginosa is worsening, demonstrating the urgent need for new therapeutics that are effective against multidrug-resistant bacteria. One potential class of substances is cationic antimicrobial peptides. More than 1000 natural occurring peptides have been described so far. These peptides are short (less than 50 amino acids long), cationic, amphiphilic, demonstrate different three-dimensional structures, and appear to have different modes of action. A new screening assay was developed to characterize and optimize short antimicrobial peptides. This assay is based on peptides synthesized on cellulose, combined with a bacterium, where a luminescence gene cassette was introduced. With help of this method tens of thousands of peptides can be screened per year. Information gained by this high-throughput screening can be used in quantitative structure-activity relationships (QSAR) analysis. QSAR analysis attempts to correlate chemical structure to measurement of biological activity using statistical methods. QSAR modeling of antimicrobial peptides to date has been based on predicting differences between peptides that are highly similar. The studies have largely addressed differences in lactoferricin and protegrin derivatives or similar de novo peptides. The mathematical models used to relate the QSAR descriptors to biological activity have been linear models such as principle component analysis or multivariate linear regression. However, with the development of high-throughput peptide synthesis and an antibacterial activity assay, the numbers of peptides and sequence diversity able to be studied have increased dramatically. Also, "inductive" QSAR descriptors have been recently developed to accurately distinguish active from inactive drug-like activity in small compounds. "Inductive" QSAR in combination with more complex mathematical modeling algorithms such as artificial neural networks (ANNs) may yield powerful new methods for in silico identification of novel antimicrobial peptides.
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Affiliation(s)
- Kai Hilpert
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, British Columbia, Canada
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Clausell A, Rabanal F, Garcia-Subirats M, Asunción Alsina M, Cajal Y. Membrane association and contact formation by a synthetic analogue of polymyxin B and its fluorescent derivatives. J Phys Chem B 2007; 110:4465-71. [PMID: 16509750 DOI: 10.1021/jp0551972] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
sP-B is a synthetic analogue of the natural lipopeptide antibiotic polymyxin B (PxB) that maintains the ability of the parent compound to form vesicle-vesicle contacts and induce lipid exchange. Exchange is selective, and only monoanionic phospholipids such as 1-palmitoyl-2-oleoyl-glycero-sn-3-phosphoglycerol (POPG) are transferred, whereas dianionic phospholipids such as 1-palmitoyl-2-oleoyl-glycero-sn-3-phosphate (POPA) are not, as shown by fluorescence experiments based on the excimer/monomer ratio of pyrene-labeled phospholipids. Synthetic fluorescent analogues of sP-B are used to investigate the peptide position and orientation in the intermembrane contacts: sP-Bw, an analogue that contains D-tryptophan (D-Trp) instead of the naturally occurring D-phenylalanine, and sP-Bpy, incorporating a pyrene group at the N-terminus. Tryptophan fluorescence, anisotropy, and quenching measurements performed with sP-Bw indicate that the peptide binds and inserts in anionic vesicles of POPG and POPA. However, significant differences are seen depending on the lipid composition, as also demonstrated by fluorescence resonance energy transfer (FRET) experiments from Trp to 7-nitro-2-1,3-benzoxadiazol (NBD) groups at the interface. Intermolecular FRET using sP-Bw as the donor and sP-Bpy as the acceptor indicates self-association of the peptide, possibly forming dimers, when bound to POPG vesicles at concentrations that induce the vesicle-vesicle contacts.
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Affiliation(s)
- Adrià Clausell
- Physical Chemistry Department, Faculty of Pharmacy, University of Barcelona, Avn. Joan XXIII s/n, 08028 Barcelona, Spain
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Clausell A, Garcia-Subirats M, Pujol M, Busquets MA, Rabanal F, Cajal Y. Gram-Negative Outer and Inner Membrane Models: Insertion of Cyclic Cationic Lipopeptides. J Phys Chem B 2007; 111:551-63. [PMID: 17228913 DOI: 10.1021/jp064757+] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Most Gram-negative bacteria are susceptible to polymyxin B (PxB), and development of resistance to this cationic lipopeptide is very rare. PxB mechanism of action involves interaction with both the outer membrane (OM) and the inner membrane (IM) of bacteria. For the design of new antibiotics based on the structure of PxB and with improved therapeutic indexes, it is essential to establish the key features of PxB that are important for activity. We have used an approach based on mimicking the outer layers of the OM and the IM of Gram-negative bacteria using monolayers of lipopolysaccharide (LPS) or anionic 1-palmitoyl-2-oleoylglycero-sn-3-phosphoglycerol (POPG), respectively, and using a combination of penetration assay, analysis of pressure/area curves, and Brewster angle microscopy to monitor surface morphology changes. Synthetic analogue sp-B maintains the basic structural characteristics of the natural compound and interacts with the OM and the IM in a similar way. Analogue sp-C, with a mutation of the sequence [d-Phe6-Leu7] into [d-Phe6-Dab7], shows that this hydrophobic domain is involved in LPS binding. The significant role of the positive charges is demonstrated with sp-Dap analogue, where l-alpha,gamma-diaminobutyric acid residues Dab1 and Dab8 are replaced by l-alpha,gamma-diaminopropionic acid (Dap), resulting in lower degrees of insertion in both LPS and PG monolayers. The importance of the N-terminal acyl chain is demonstrated with polymyxin B nonapeptide (PxB-np). PxB-np shows lower affinity for LPS compared to PxB, sp-B, or sp-C, but it does not insert into PG monolayers, although it binds superficially to the anionic film. Since PxB microbial killing appears to be mediated by osmotic instability due to OM-IM phospholipid exchange, the ability of the different peptides to induce membrane-membrane lipid exchange has been studied by use of phospholipid unilamellar vesicles. Results indicate that cationic amphipathicity determines peptide activity.
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Affiliation(s)
- Adrià Clausell
- Physical Chemistry Department and Institute of Nanoscience and Nanotechnology, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain
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