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Adak A, Castelletto V, Mendes B, Barrett G, Seitsonen J, Hamley IW. Chirality and pH Influence the Self-Assembly of Antimicrobial Lipopeptides with Diverse Nanostructures. ACS APPLIED BIO MATERIALS 2024; 7:5553-5565. [PMID: 39042039 DOI: 10.1021/acsabm.4c00664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
Chirality plays a crucial role in the self-assembly of biomolecules in nature. Peptides show chirality-dependent conformation and self-assembly. Lipidation of peptides occurs in vivo and has recently been exploited in designed conjugates to drive self-assembly and enhance bioactivity. Here, a library of pH-responsive homochiral and heterochiral lipidated tripeptides has been designed. The designed lipopeptides comprise homochiral C16-YKK or C16-WKK (where all the amino acids are l-isomers), and two heterochiral conjugates C16-Ykk and C16-Wkk (where the two lysines are d-isomers). The self-assembly of all the synthesized lipopeptides in aqueous solution was examined using a combination of spectroscopic methods along with cryogenic-transmission electron microscopy (cryo-TEM) and small-angle X-ray scattering (SAXS). Interestingly, it was observed that at acidic pH all the lipopeptides self-assemble into micelles, whereas at basic pH the homochiral lipopeptides self-assemble into nanofibers, whereas the heterochiral lipopeptides self-assemble into nanotapes and nanotubes. A pH switch was demonstrated using a thioflavin T fluorescence probe of β-sheet structure present in the extended structures at pH 8. We demonstrate that both chirality and pH in lipopeptides influence the self-assembly behavior of the model tripeptides, which also show promising bioactivity. Good cytocompatibility is observed in hemolytic assays and antimicrobial activity against both Gram-negative and Gram-positive bacteria is shown through the determination of minimum inhibition concentration (MIC) and minimum bactericidal concentration (MBC) values and live/dead bacteria staining assay.
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Affiliation(s)
- Anindyasundar Adak
- School of Chemistry, Pharmacy and Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Valeria Castelletto
- School of Chemistry, Pharmacy and Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Bruno Mendes
- School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6AH, U.K
| | - Glyn Barrett
- School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6AH, U.K
| | - Jani Seitsonen
- Nanomicroscopy Center, Aalto University, Puumiehenkuja 2, FIN-02150 Espoo, Finland
| | - Ian W Hamley
- School of Chemistry, Pharmacy and Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AD, U.K
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2
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Torres-Salgado JF, Villagrana-Escareño MV, Duran-Meza AL, Segovia-Gonzalez XF, Cadena-Nava RD, Gelbart WM, Knobler CM, Ruiz-García J. Spontaneous bilayer wrapping of virus particles by a phospholipid Langmuir monolayer. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2023; 46:118. [PMID: 38051443 PMCID: PMC10697897 DOI: 10.1140/epje/s10189-023-00366-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 09/27/2023] [Indexed: 12/07/2023]
Abstract
We report here the spontaneous formation of lipid-bilayer-wrapped virus particles, following the injection of "naked" virus particles into the subphase of a Langmuir trough with a liquid monolayer of lipids at its air-water interface. The virus particles are those of the well-studied cowpea chlorotic mottle virus, CCMV, which are negatively charged at the pH 6 of the subphase; the lipids are a 9:1 mix of neutral DMPC and cationic CTAB molecules. Before adding CCMV particles to the subphase we establish the mixed lipid monolayer in its liquid-expanded state at a fixed pressure (17.5 mN/m) and average area-per-molecule of (41Å2). Keeping the total area fixed, the surface pressure is observed to decrease at about 15 h after adding the virus particles in the subphase; by 37 h it has dropped to zero, corresponding to essentially all the lipid molecules having been removed from the air-water interface. By collecting particles from the subphase and measuring their sizes by atomic force microscopy, we show that the virus particles have been wrapped by lipid bilayers (or by two lipid bilayers). These results can be understood in terms of thermal fluctuations and electrostatic interactions driving the wrapping of the anionic virus particles by the cationic lipids. Spontaneous acquisition by a virus particle of, first, a hydrophobic lipid monolayer envelope and, then, a hydrophilic lipid bilayer envelope, as it interacts from the subphase with an oppositely charged Langmuir monolayer.
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Affiliation(s)
- J F Torres-Salgado
- Biological Physics Laboratory, Institute of Physics, Universidad Autónoma de San Luis Potosí, San Luis/dF Potosí, 78000, San Luis Potosí, México
| | - M V Villagrana-Escareño
- Biological Physics Laboratory, Institute of Physics, Universidad Autónoma de San Luis Potosí, San Luis/dF Potosí, 78000, San Luis Potosí, México
| | - A L Duran-Meza
- Biological Physics Laboratory, Institute of Physics, Universidad Autónoma de San Luis Potosí, San Luis/dF Potosí, 78000, San Luis Potosí, México
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - X F Segovia-Gonzalez
- Biological Physics Laboratory, Institute of Physics, Universidad Autónoma de San Luis Potosí, San Luis/dF Potosí, 78000, San Luis Potosí, México
| | - R D Cadena-Nava
- Biological Physics Laboratory, Institute of Physics, Universidad Autónoma de San Luis Potosí, San Luis/dF Potosí, 78000, San Luis Potosí, México
- Present Address: Center of Nanosciences and Nanotechnology-UNAM, Km 107 Carretera Tijuana-Ensenada, 22800, Ensenada, BC, México
| | - W M Gelbart
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA, 90095-1569, USA.
| | - C M Knobler
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - J Ruiz-García
- Biological Physics Laboratory, Institute of Physics, Universidad Autónoma de San Luis Potosí, San Luis/dF Potosí, 78000, San Luis Potosí, México
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3
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Wyżga B, Skóra M, Hąc-Wydro K. The influence of Leucidal - eco-preservative from radish - on model lipid membranes and selected pathogenic bacteria. Chem Phys Lipids 2023; 256:105338. [PMID: 37716416 DOI: 10.1016/j.chemphyslip.2023.105338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 08/23/2023] [Accepted: 09/11/2023] [Indexed: 09/18/2023]
Abstract
In this work the effect of Leucidal - a natural preservative from radish dedicated to be used in cosmetics - on bacteria cells and model bacteria membranes was investigated. To get insight into the mechanism of action of this formulation the lipid Langmuir monolayers imitating Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) membranes were prepared. Then, the influence of Leucidal on model systems was investigated by means of the surface pressure/area measurements, penetration studies and Brewster Angle Microscopy (BAM) visualization. Similar experiments were done also for one component monolayers formed from the model membrane lipids. The in vitro tests were done on five different bacteria species (E. coli, Enterococcus faecalis, S. aureus, Salmonella enterica, Pseudomonas aeruginosa). Leucidal was found to decrease packing of the monolayers, however, it was excluded from the films at higher concentrations. Model membrane experiments evidenced also a stronger affinity of the components of this eco-preservative to E. coli vs S. aureus membrane. Among one component films, those formed from phosphatidylglycerols and cardiolipins were more sensitive to the presence of Leucidal. However, in vitro tests evidenced that Leucidal exerts stronger inhibitory effect against S. aureus bacteria as compared to E. coli strain. These findings were discussed from the point of view of the role of Leucidal components and the lipid membrane properties in the membrane - based mechanism of action of this preservative. The results allow one to suggest that the membrane may not be the main site of action of Leucidal on bacteria. Moreover, since high concentration of the tested preparation exerted antibacterial activity in relation to all tested bacteria, a low selectivity of Leucidal can be postulated, which may be problematic from the point of view of its effect on the skin microbiome.
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Affiliation(s)
- Beata Wyżga
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland; Jagiellonian University, Doctoral School of Exact and Natural Sciences, Łojasiewicza 11, 30-348 Kraków, Poland
| | - Magdalena Skóra
- Jagiellonian University Medical College, Chair of Microbiology, Department of Infections Control and Mycology, Czysta 18, 31-121 Kraków, Poland
| | - Katarzyna Hąc-Wydro
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland.
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4
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MacDermott-Opeskin HI, Wilson KA, O'Mara ML. The Impact of Antimicrobial Peptides on the Acinetobacter baumannii Inner Membrane Is Modulated by Lipid Polyunsaturation. ACS Infect Dis 2023; 9:815-826. [PMID: 36920795 DOI: 10.1021/acsinfecdis.2c00530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
The Gram-negative pathogen Acinetobacter baumannii is a primary contributor to nosocomial multi-drug-resistant (MDR) infections. To combat the rise of MDR infections, novel features of A. baumannii need to be considered for the development of new treatment options. One such feature is the preferential scavenging of exogenous lipids, including host-derived polyunsaturated fatty acids (PUFAs), for membrane phospholipid synthesis. These alterations in membrane composition impact both the lipid chemistry and the membrane biophysical properties. In this work we examine how antimicrobial peptides (AMPs) interact with the inner membranes of A. baumannii in the presence and absence of polyunsaturated phospholipids. Using coarse-grained molecular dynamics simulations of complex A. baumannii inner membrane models derived from lipidomes of bacteria grown in the presence and absence of PUFAs, we examine the impact of the adsorption of four prototypical AMPs (CAMEL, LL-37, pexiganan, and magainin-2) on the membrane biophysical properties. Our simulations reveal that the impact of AMP adsorption on the membrane biophysical properties was dependent on both the membrane composition and the specific AMP involved. Both lipid headgroup charge and tail unsaturation played important roles in driving the interactions that occurred both within the membrane and between the membrane and AMPs. The changes to the membrane biophysical properties also showed a complex relationship with the AMP's physical properties, such as AMP charge, chain length, and charge-to-mass ratio. Cumulatively, this work highlights the importance of studying AMPs using a complex membrane environment and provides insights into the mechanistic action of AMPs in polyunsaturated lipid-rich bacterial membranes.
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Affiliation(s)
- Hugo I MacDermott-Opeskin
- Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT 2601, Australia
| | - Katie A Wilson
- Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT 2601, Australia.,Department of Biochemistry, Memorial University of Newfoundland, St. John's, NL A1C 5S7 Canada
| | - Megan L O'Mara
- Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT 2601, Australia.,Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
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5
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Won T, Mohid SA, Choi J, Kim M, Krishnamoorthy J, Biswas I, Bhunia A, Lee D. The role of hydrophobic patches of de novo designed MSI-78 and VG16KRKP antimicrobial peptides on fragmenting model bilayer membranes. Biophys Chem 2023; 296:106981. [PMID: 36871366 DOI: 10.1016/j.bpc.2023.106981] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/06/2023] [Accepted: 02/21/2023] [Indexed: 02/26/2023]
Abstract
Antimicrobial peptides (AMPs) with cell membrane lysing capability are considered potential candidates for the development of the next generation of antibiotics. Designing novel AMPs requires an in-depth understanding of the mechanism of action of the peptides. In this work, we used various biophysical techniques including 31P solid-state NMR to examine the interaction of model membranes with amphipathic de novo-designed peptides. Two such peptides, MSI-78 and VG16KRKP, were designed with different hydrophobicity and positive charges. The model lipid membranes were constituted by mixing lipids of varying degrees of 'area per lipid' (APL), which directly affected the packing properties of the membrane. The observed emergence of the isotropic peak in 31P NMR spectra as a function of time is a consequence of the fragmentation of the membrane mediated by the peptide interaction. The factors such as the charges, overall hydrophilicity of the AMPs, as well as lipid membrane packing, contributed to the kinetics of membrane fragmentation. Furthermore, we anticipate the designed AMPs follow the carpet and toroidal pore mechanisms when lysing the cell membrane. This study highlights the significance of the effect of the overall charges and the hydrophobicity of the novel AMPs designed for antimicrobial activity.
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Affiliation(s)
- TaeJun Won
- Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
| | - Sk Abdul Mohid
- Department of Biophysics, Bose Institute, Unified Academic Campus, Bidhan Nagar EN 80, Kolkata 700 091, India
| | - JiHye Choi
- Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
| | - MinSoo Kim
- Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
| | | | - Indranil Biswas
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Anirban Bhunia
- Department of Biophysics, Bose Institute, Unified Academic Campus, Bidhan Nagar EN 80, Kolkata 700 091, India.
| | - DongKuk Lee
- Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.
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6
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Amphiphilic Gold Nanoparticles: A Biomimetic Tool to Gain Mechanistic Insights into Peptide-Lipid Interactions. MEMBRANES 2022; 12:membranes12070673. [PMID: 35877876 PMCID: PMC9324301 DOI: 10.3390/membranes12070673] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/20/2022] [Accepted: 06/22/2022] [Indexed: 02/04/2023]
Abstract
Functional peptides are now widely used in a myriad of biomedical and clinical contexts, from cancer therapy and tumor targeting to the treatment of bacterial and viral infections. Underlying this diverse range of applications are the non-specific interactions that can occur between peptides and cell membranes, which, in many contexts, result in spontaneous internalization of the peptide within cells by avoiding energy-driven endocytosis. For this to occur, the amphipathicity and surface structural flexibility of the peptides play a crucial role and can be regulated by the presence of specific molecular residues that give rise to precise molecular events. Nevertheless, most of the mechanistic details regulating the encounter between peptides and the membranes of bacterial or animal cells are still poorly understood, thus greatly limiting the biomimetic potential of these therapeutic molecules. In this arena, finely engineered nanomaterials—such as small amphiphilic gold nanoparticles (AuNPs) protected by a mixed thiol monolayer—can provide a powerful tool for mimicking and investigating the physicochemical processes underlying peptide-lipid interactions. Within this perspective, we present here a critical review of membrane effects induced by both amphiphilic AuNPs and well-known amphiphilic peptide families, such as cell-penetrating peptides and antimicrobial peptides. Our discussion is focused particularly on the effects provoked on widely studied model cell membranes, such as supported lipid bilayers and lipid vesicles. Remarkable similarities in the peptide or nanoparticle membrane behavior are critically analyzed. Overall, our work provides an overview of the use of amphiphilic AuNPs as a highly promising tailor-made model to decipher the molecular events behind non-specific peptide-lipid interactions and highlights the main affinities observed both theoretically and experimentally. The knowledge resulting from this biomimetic approach could pave the way for the design of synthetic peptides with tailored functionalities for next-generation biomedical applications, such as highly efficient intracellular delivery systems.
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7
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Kumar R, Ali SA, Singh SK, Bhushan V, Mathur M, Jamwal S, Mohanty AK, Kaushik JK, Kumar S. Antimicrobial Peptides in Farm Animals: An Updated Review on Its Diversity, Function, Modes of Action and Therapeutic Prospects. Vet Sci 2020; 7:vetsci7040206. [PMID: 33352919 PMCID: PMC7766339 DOI: 10.3390/vetsci7040206] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/15/2020] [Accepted: 11/16/2020] [Indexed: 12/13/2022] Open
Abstract
Antimicrobial peptides (AMPs) are the arsenals of the innate host defense system, exhibiting evolutionarily conserved characteristics that are present in practically all forms of life. Recent years have witnessed the emergence of antibiotic-resistant bacteria compounded with a slow discovery rate for new antibiotics that have necessitated scientific efforts to search for alternatives to antibiotics. Research on the identification of AMPs has generated very encouraging evidence that they curb infectious pathologies and are also useful as novel biologics to function as immunotherapeutic agents. Being innate, they exhibit the least cytotoxicity to the host and exerts a wide spectrum of biological activity including low resistance among microbes and increased wound healing actions. Notably, in veterinary science, the constant practice of massive doses of antibiotics with inappropriate withdrawal programs led to a high risk of livestock-associated antimicrobial resistance. Therefore, the world faces tremendous pressure for designing and devising strategies to mitigate the use of antibiotics in animals and keep it safe for posterity. In this review, we illustrate the diversity of farm animal-specific AMPs, and their biochemical foundations, mode of action, and prospective application in clinics. Subsequently, we present the data for their systematic classification under the major and minor groups, antipathogenic action, and allied bioactivities in the host. Finally, we address the limitations of their clinical implementation and envision areas for further advancement.
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8
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Zeng F, Zhao C, Wu X, Dong R, Li G, Zhu Q, Zheng E, Liu D, Yang J, Moisyadi S, Urschitz J, Li Z, Wu Z. Bacteria-induced expression of the pig-derived protegrin-1 transgene specifically in the respiratory tract of mice enhances resistance to airway bacterial infection. Sci Rep 2020; 10:16020. [PMID: 32994542 PMCID: PMC7524760 DOI: 10.1038/s41598-020-73084-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 09/11/2020] [Indexed: 02/06/2023] Open
Abstract
About 70% of all antibiotics produced in the world are used in the farm animal industry. The massive usage of antibiotics during farm animal production has caused rapid development of antibiotic resistance in bacteria, which poses a serious risk to human and livestock health when treating bacterial infections. Protegrin-1 (PG-1) is a potent antimicrobial peptide (AMP). It was initially identified in pig leukocytes with a broad-spectrum antibacterial and antiviral activity, and a low rate of inducing bacterial resistance. To develop a genetic approach for reducing the use of antibiotics in farm animal production, we produced transgenic mice carrying a bovine tracheal AMP gene promoter-controlled PG-1 transgene. The PG-1 transgene was specifically expressed in the respiratory tract of transgenic mice upon induction by bacterial infection. These PG-1 transgenic mice exhibited enhanced resistance to nasal bacterial infection as the transgenic mice showed a higher survival rate (79.17% VS. 34.78%), lower bacterial load and milder histological severity than their wild-type control littermates. The improved resistance to bacterial infection in the PG-1 transgenic mice could be resulted from the direct bacteria-killing activities of PG-1, and the immunomodulatory effects of PG-1 via stimulating interleukin 1 beta secretion. The present study provides a promising genetic strategy to prevent airway bacterial infections in farm animals by bacteria-inducible tissue-specific expression of PG-1 transgene. This approach may also be helpful for decreasing the possibility of inducing bacterial resistance during farm animal production.
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Affiliation(s)
- Fang Zeng
- College of Marine Science, South China Agricultural University, Guangzhou, 510642, China.,National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Chengcheng Zhao
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Xiao Wu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Rui Dong
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Guoling Li
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Qingchun Zhu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Enqin Zheng
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Dewu Liu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China
| | - Jinzeng Yang
- Department of Human Nutrition, Food and Animal Sciences, University of Hawaii at Manoa, Honolulu, HI, USA
| | - Stefan Moisyadi
- Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI, USA
| | - Johann Urschitz
- Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI, USA
| | - Zicong Li
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China. .,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China.
| | - Zhenfang Wu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China. .,Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou, 510642, China.
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9
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Study of the Mechanism of the Antimicrobial Activity of Novel Water Soluble Ammonium Quaternary Benzanthrone on Model Membranes. J Membr Biol 2020; 253:247-256. [PMID: 32393995 DOI: 10.1007/s00232-020-00121-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 05/02/2020] [Indexed: 10/24/2022]
Abstract
The increasing resistance of many pathogens to most of the common antimicrobials requires the development of new substances with more effective antimicrobial properties. In the present work, we investigated the mechanism of the antimicrobial activity of novel water soluble ammonium quaternary benzanthrone (Compound B) on model membranes, composed of dipalmitoylphosphatidylcholine, 1-palmitoyl-2-oleoylphosphatidylcholine, dipalmitoylphosphatidylglycerol, 1-palmitoyl-2-oleoylphosphatidylglycerol, and dipalmitoylphosphatidylethanolamine (DPPE). The lipids were chosen to represent a model of a bacterial membrane. The changes in surface pressure of the model membranes, before and after the addition of Compound B, were studied by the Langmuir's monolayer method, and the compressional modulus for each monolayer was determined. In addition, the surface morphology of the lipid monolayers before and after injection of Compound B was monitored by Brewster Angle Microscopy. The results showed that Compound B penetrated all the monolayers studied. The most noticeable effects were found with the negatively charged phosphatidylglycerols and with DPPE leading to the conclusion that the electrostatic interactions between the compound and the lipid head groups and the possible formation of hydrogen bonds between the amino group of the ethanolamine and the keto groups in the structure of Compound B are of great importance. In addition, the penetration ability of the benzoquinone with all phospholipids studied was stable even at higher values of the surface pressure, i.e. thicker monolayers, due to the hydrophobic interaction, which plays also an important role for the antimicrobial activity of Compound B.
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10
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Zhang W, Metzger JM, Hackel BJ, Bates FS, Lodge TP. Influence of the Headgroup on the Interaction of Poly(ethylene oxide)-Poly(propylene oxide) Block Copolymers with Lipid Bilayers. J Phys Chem B 2020; 124:2417-2424. [PMID: 32175743 DOI: 10.1021/acs.jpcb.0c00553] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The lipid headgroup plays an important role in the association of polymers with lipid bilayer membranes. Herein, we report how a glycerol headgroup versus a choline headgroup affects the interaction of poly(ethylene oxide)-b-poly(propylene oxide) (PEO-PPO) block copolymers with lipid bilayer vesicles. Unilamellar vesicles composed of phosphatidylcholine and phosphatidylglycerol at various molar ratios were used as model membranes. The interactions between the block copolymers and lipid bilayers were quantified by pulsed-field gradient nuclear magnetic resonance (PFG-NMR) based on the distinctly different mobilities of free and bound polymers. All the investigated polymer species showed significantly higher binding with 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) sodium salt (POPG) liposomes than with 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) liposomes, indicating stronger association with the glycerol headgroup compared to the choline headgroup. This effect did not become significant until the composition of mixed POPC/POPG liposomes contained more than 20 mol % POPG. A plausible explanation for the enhanced polymer binding with POPG invokes the role of hydrogen bonding between the glycerol headgroup and the ether moieties of the polymers.
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Affiliation(s)
- Wenjia Zhang
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Joseph M Metzger
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Benjamin J Hackel
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Frank S Bates
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy P Lodge
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.,Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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11
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Beyond electrostatics: Antimicrobial peptide selectivity and the influence of cholesterol-mediated fluidity and lipid chain length on protegrin-1 activity. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:182977. [DOI: 10.1016/j.bbamem.2019.04.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 04/11/2019] [Accepted: 04/28/2019] [Indexed: 12/31/2022]
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12
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Edwards-Gayle CC, Castelletto V, Hamley IW, Barrett G, Greco F, Hermida-Merino D, Rambo RP, Seitsonen J, Ruokolainen J. Self-Assembly, Antimicrobial Activity, and Membrane Interactions of Arginine-Capped Peptide Bola-Amphiphiles. ACS APPLIED BIO MATERIALS 2019; 2:2208-2218. [PMID: 31157325 PMCID: PMC6537463 DOI: 10.1021/acsabm.9b00172] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 04/16/2019] [Indexed: 12/27/2022]
Abstract
The self-assembly and antimicrobial activity of two novel arginine-capped bola-amphiphile peptides, namely RA6R and RA9R (R, arginine; A, alanine) are investigated. RA6R does not self-assemble in water due to its high solubility, but RA9R self-assembles above a critical aggregation concentration into ordered nanofibers due to the high hydrophobicity of the A9block. The structure of the RA9R nanofibers is studied by cryogenic transmission electron microscopy (cryo-TEM) and small-angle X-ray scattering (SAXS). Circular dichroism spectroscopy shows that both RA6R and RA9R adopt coil conformations in water at low concentration, but only RA9R adopts a β-sheet conformation at high concentration. SAXS and differential scanning calorimetry are used to study RA6R and RA9R interactions with a mixed lipid membrane that models a bacterial cell wall, consisting of multilamellar 1,2-dipalmitoyl-sn-glycero-3-phosphoglycerol/1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine vesicles. Cytotoxicity studies show that RA6R is more cytocompatible than RA9R. RA6R has enhanced activity against the Gram-negative pathogen P. aeruginosa at a concentration where viability of mammalian cells is retained. RA9R has little antimicrobial activity, independently of concentration. Our results highlight the influence of the interplay between relative charge and hydrophobicity on the self-assembly, cytocompatibility, and bioactivity of peptide bola-amphiphiles.
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Affiliation(s)
- Charlotte
J. C. Edwards-Gayle
- School
of Chemistry, Food Biosciences and Pharmacy, University of Reading, Whiteknights, Reading RG6 6AD, U.K.
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxfordshire OX11 0DE, U.K.
| | - Valeria Castelletto
- School
of Chemistry, Food Biosciences and Pharmacy, University of Reading, Whiteknights, Reading RG6 6AD, U.K.
| | - Ian W. Hamley
- School
of Chemistry, Food Biosciences and Pharmacy, University of Reading, Whiteknights, Reading RG6 6AD, U.K.
| | - Glyn Barrett
- School
of Biological Sciences, University of Reading, Reading RG6 6UR, U.K.
| | - Francesca Greco
- School
of Chemistry, Food Biosciences and Pharmacy, University of Reading, Whiteknights, Reading RG6 6AD, U.K.
| | | | - Robert P. Rambo
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxfordshire OX11 0DE, U.K.
| | - Jani Seitsonen
- Department
of Applied Physics, Aalto School of Science, P.O. Box 15100, FI-00076 Aalto, Finland
| | - Janne Ruokolainen
- Department
of Applied Physics, Aalto School of Science, P.O. Box 15100, FI-00076 Aalto, Finland
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13
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Hitchner MA, Santiago-Ortiz LE, Necelis MR, Shirley DJ, Palmer TJ, Tarnawsky KE, Vaden TD, Caputo GA. Activity and characterization of a pH-sensitive antimicrobial peptide. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:182984. [PMID: 31075228 DOI: 10.1016/j.bbamem.2019.05.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 12/20/2018] [Accepted: 01/06/2019] [Indexed: 12/11/2022]
Abstract
Antimicrobial peptides (AMPs) have been an area of great interest, due to the high selectivity of these molecules toward bacterial targets over host cells and the limited development of bacterial resistance to these molecules throughout evolution. Previous work showed that when Histidine was incorporated into the peptide C18G it lost antimicrobial activity. The role of pH on activity and biophysical properties of the peptide was investigated to explain this phenomenon. Minimal inhibitory concentration (MIC) results demonstrated that decreased media pH increased antimicrobial activity. Trichloroethanol (TCE) quenching and red-edge excitation spectroscopy (REES) showed a clear pH dependence on peptide aggregation in solution. Trp fluorescence was used to monitor binding to lipid vesicles and demonstrated the peptide binds to anionic bilayers at all pH values tested, however, binding to zwitterionic bilayers was enhanced at pH 7 and 8 (above the His pKa). Dual Quencher Analysis (DQA) confirmed the peptide inserted more deeply in PC:PG and PE:PG membranes, but could insert into PC bilayers at pH conditions above the His pKa. Bacterial membrane permeabilization assays which showed enhanced membrane permeabilization at pH 5 and 6 but vesicle leakage assays indicate enhanced permeabilization of PC and PC:PG bilayers at neutral pH. The results indicate the ionization of the His side chain affects the aggregation state of the peptide in solution and the conformation the peptide adopts when bound to bilayers, but there are likely more subtle influences of lipid composition and properties that impact the ability of the peptide to form pores in membranes.
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Affiliation(s)
- Morgan A Hitchner
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America
| | - Luis E Santiago-Ortiz
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America
| | - Matthew R Necelis
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America
| | - David J Shirley
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America
| | - Thaddeus J Palmer
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America
| | - Katharine E Tarnawsky
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America
| | - Timothy D Vaden
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America
| | - Gregory A Caputo
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America; Department of Molecular and Cellular Biosciences, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, United States of America.
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14
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Effects of the peptide Magainin H2 on Supported Lipid Bilayers studied by different biophysical techniques. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2635-2643. [DOI: 10.1016/j.bbamem.2018.10.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 10/02/2018] [Indexed: 11/24/2022]
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15
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Adamczewski P, Tsoukanova V. Phenylalanine intercalation parameters for liquid-disordered phase domains - a membrane model study. BMC BIOPHYSICS 2018; 11:6. [PMID: 30473783 PMCID: PMC6237005 DOI: 10.1186/s13628-018-0047-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 10/31/2018] [Indexed: 12/17/2022]
Abstract
BACKGROUND Propensity of phenylalanine (Phe) for nonpolar environments drives its intercalation into phospholipid membranes, which has been implicated in metabolic and neurological disorders. The knowledge of Phe intercalation parameters can be instrumental in understanding various membrane processes triggered by interactions with Phe, in particular the early events leading to the formation of nucleation/docking sites for the self-assembly of Phe amyloid fibrils at the membrane surface. RESULTS In this study, we used monolayers of phosphatidylethanolamine (DPPE) and phosphatidylcholine (DPPC) to mimic the membrane outer leaflet. Its initial interaction with Phe was modeled by injecting Phe into the aqueous phase underneath the monolayer. Constant pressure insertion assays augmented with epifluorescence microscopy imaging were used to monitor Phe intercalation. Our primary goal was to determine the Phe intercalation area, A Phe. Two values were obtained for A Phe, 33 ± 2 and 48 ± 3 Å2. CONCLUSIONS Phe appeared to discriminate between DPPE and DPPC packing, and use two modes of intercalation. The area of A Phe 33 ± 2 Å2 is consistent with a Phe monomer intercalating into membrane by inserting the phenyl ring nearly normal to the membrane surface. This mode has been found to operate in DPPE membranes. For DPPC membranes however, the value of A Phe = 48 ± 3 Å2 suggests that, from saline, Phe tends to intercalate as a larger species plausibly dragging along a counterion, Na+, in a Na+(Phe) complex.
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16
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Pereira LS, Camacho SA, Malfatti-Gasperini AA, Jochelavicius K, Nobre TM, Oliveira ON, Aoki PH. Evidence of photoinduced lipid hydroperoxidation in Langmuir monolayers containing Eosin Y. Colloids Surf B Biointerfaces 2018; 171:682-689. [DOI: 10.1016/j.colsurfb.2018.08.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 07/20/2018] [Accepted: 08/03/2018] [Indexed: 01/01/2023]
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17
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Nelson N, Schwartz DK. Single-Molecule Resolution of Antimicrobial Peptide Interactions with Supported Lipid A Bilayers. Biophys J 2018; 114:2606-2616. [PMID: 29874611 PMCID: PMC6129183 DOI: 10.1016/j.bpj.2018.04.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 03/16/2018] [Accepted: 04/12/2018] [Indexed: 01/12/2023] Open
Abstract
The molecular interactions between antimicrobial peptides (AMPs) and lipid A-containing supported lipid bilayers were probed using single-molecule total internal reflection fluorescence microscopy. Hybrid supported lipid bilayers with lipid A outer leaflets and phospholipid (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE)) inner leaflets were prepared and characterized, and the spatiotemporal trajectories of individual fluorescently labeled LL37 and Melittin AMPs were determined as they interacted with the bilayer surfaces comprising either monophosphoryl or diphosphoryl lipid A (from Escherichia coli) to determine the impact of electrostatic interactions. Large numbers of trajectories were obtained and analyzed to obtain the distributions of surface residence times and the statistics of the spatial trajectories. Interestingly, the AMP species were sensitive to subtle differences in the charge of the lipid, with both peptides diffusing more slowly and residing longer on the diphosphoryl lipid A. Furthermore, the single-molecule dynamics indicated a qualitative difference between the behavior of AMPs on hybrid Lipid A bilayers and on those composed entirely of DOPE. Whereas AMPs interacting with a DOPE bilayer exhibited two-dimensional Brownian diffusion with a diffusion coefficient of ∼1.7 μm2/s, AMPs adsorbed to the lipid A surface exhibited much slower apparent diffusion (on the order of ∼0.1 μm2/s) and executed intermittent trajectories that alternated between two-dimensional Brownian diffusion and desorption-mediated three-dimensional flights. Overall, these findings suggested that bilayers with lipid A in the outer leaflet, as it is in bacterial outer membranes, are valuable model systems for the study of the initial stage of AMP-bacterium interactions. Furthermore, single-molecule dynamics was sensitive to subtle differences in electrostatic interactions between cationic AMPs and monovalent or divalent anionic lipid A moieties.
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Affiliation(s)
- Nathaniel Nelson
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado
| | - Daniel K Schwartz
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado.
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18
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Langmuir-monolayer methodologies for characterizing protein-lipid interactions. Chem Phys Lipids 2018; 212:61-72. [DOI: 10.1016/j.chemphyslip.2018.01.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/22/2017] [Accepted: 01/18/2018] [Indexed: 12/22/2022]
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19
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Venkatesan GA, Taylor GJ, Basham CM, Brady NG, Collier CP, Sarles SA. Evaporation-induced monolayer compression improves droplet interface bilayer formation using unsaturated lipids. BIOMICROFLUIDICS 2018; 12:024101. [PMID: 29576833 PMCID: PMC5832467 DOI: 10.1063/1.5016523] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 02/13/2018] [Indexed: 05/25/2023]
Abstract
In this article, we report on a new experimental methodology to enable reliable formation of droplet interface bilayer (DIB) model membranes with two types of unsaturated lipids that have proven difficult for creating stable DIBs. Through the implementation of a simple evaporation technique to condition the spontaneously assembled lipid monolayer around each droplet, we increased the success rates of DIB formation for two distinct unsaturated lipids, namely 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), from less than 10% to near 100%. Separately, using a pendant drop tensiometer, we learned that: (a) DOPC and POPC monolayers do not spontaneously assemble into their tightest possible configurations at an oil-water interface, and (b) reducing the surface area of a water droplet coated with a partially packed monolayer leads to a more tightly packed monolayer with an interfacial tension lower than that achieved by spontaneous assembly alone. We also estimated from Langmuir compression isotherms obtained for both lipids that the brief droplet evaporation procedure prior to DIB formation resulted in a 6%-16% reduction in area per lipid for DOPC and POPC, respectively. Finally, the increased success rates of formation for DOPC and POPC DIBs enabled quantitative characterization of unsaturated lipid membrane properties including electrical resistance, rupture potential, and specific capacitance.
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Affiliation(s)
- Guru A Venkatesan
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | | | - Colin M Basham
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Nathan G Brady
- Department of Biochemistry, Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996, USA
| | | | - Stephen A Sarles
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
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20
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Thong A, Tsoukanova V. Cytochrome-c-assisted escape of cardiolipin from a model mitochondrial membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:475-480. [DOI: 10.1016/j.bbamem.2017.10.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 10/11/2017] [Accepted: 10/30/2017] [Indexed: 12/31/2022]
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21
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Nitenberg M, Bénarouche A, Maniti O, Marion E, Marsollier L, Géan J, Dufourc EJ, Cavalier JF, Canaan S, Girard-Egrot AP. The potent effect of mycolactone on lipid membranes. PLoS Pathog 2018; 14:e1006814. [PMID: 29320578 PMCID: PMC5779694 DOI: 10.1371/journal.ppat.1006814] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 01/23/2018] [Accepted: 12/14/2017] [Indexed: 12/15/2022] Open
Abstract
Mycolactone is a lipid-like endotoxin synthesized by an environmental human pathogen, Mycobacterium ulcerans, the causal agent of Buruli ulcer disease. Mycolactone has pleiotropic effects on fundamental cellular processes (cell adhesion, cell death and inflammation). Various cellular targets of mycolactone have been identified and a literature survey revealed that most of these targets are membrane receptors residing in ordered plasma membrane nanodomains, within which their functionalities can be modulated. We investigated the capacity of mycolactone to interact with membranes, to evaluate its effects on membrane lipid organization following its diffusion across the cell membrane. We used Langmuir monolayers as a cell membrane model. Experiments were carried out with a lipid composition chosen to be as similar as possible to that of the plasma membrane. Mycolactone, which has surfactant properties, with an apparent saturation concentration of 1 μM, interacted with the membrane at very low concentrations (60 nM). The interaction of mycolactone with the membrane was mediated by the presence of cholesterol and, like detergents, mycolactone reshaped the membrane. In its monomeric form, this toxin modifies lipid segregation in the monolayer, strongly affecting the formation of ordered microdomains. These findings suggest that mycolactone disturbs lipid organization in the biological membranes it crosses, with potential effects on cell functions and signaling pathways. Microdomain remodeling may therefore underlie molecular events, accounting for the ability of mycolactone to attack multiple targets and providing new insight into a single unifying mechanism underlying the pleiotropic effects of this molecule. This membrane remodeling may act in synergy with the other known effects of mycolactone on its intracellular targets, potentiating these effects.
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Affiliation(s)
- Milène Nitenberg
- Univ. Lyon, Université Lyon 1, CNRS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS—UMR 5246, GEMBAS team, Lyon, France
| | | | - Ofelia Maniti
- Univ. Lyon, Université Lyon 1, CNRS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS—UMR 5246, GEMBAS team, Lyon, France
| | - Estelle Marion
- CRCINA, INSERM, Université de Nantes, Université d'Angers, Angers, France
| | - Laurent Marsollier
- CRCINA, INSERM, Université de Nantes, Université d'Angers, Angers, France
| | - Julie Géan
- Univ. Bordeaux, CNRS, Bordeaux INP, Chemistry and Biology of Membranes and Nano-objects, CBMN UMR 5248, Pessac, France
| | - Erick J. Dufourc
- Univ. Bordeaux, CNRS, Bordeaux INP, Chemistry and Biology of Membranes and Nano-objects, CBMN UMR 5248, Pessac, France
| | - Jean-François Cavalier
- Aix-Marseille Univ, CNRS, EIPL, Marseille, France
- Aix-Marseille Univ, CNRS, LISM, Marseille, France
| | - Stéphane Canaan
- Aix-Marseille Univ, CNRS, EIPL, Marseille, France
- Aix-Marseille Univ, CNRS, LISM, Marseille, France
| | - Agnès P. Girard-Egrot
- Univ. Lyon, Université Lyon 1, CNRS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS—UMR 5246, GEMBAS team, Lyon, France
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22
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Ciumac D, Campbell RA, Clifton LA, Xu H, Fragneto G, Lu JR. Influence of Acyl Chain Saturation on the Membrane-Binding Activity of a Short Antimicrobial Peptide. ACS OMEGA 2017; 2:7482-7492. [PMID: 30023555 PMCID: PMC6044940 DOI: 10.1021/acsomega.7b01270] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 10/12/2017] [Indexed: 05/03/2023]
Abstract
Different bacterial types and their living environments can lead to different saturations in the chains of their membrane lipids. Such structural differences may influence the efficacy of antibiotics that target bacterial membranes. In this work, the effects of acyl chain saturation on the binding of an antimicrobial peptide G4 have been examined as a function of the packing density of lipid monolayers by combining external reflection Fourier transform infrared (ER-FTIR) spectroscopy and neutron reflection (NR) measurements. Langmuir monolayers were formed from 1,2-dipalmitoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (DPPG) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (POPG), respectively, with the initial surface pressures controlled at 8 and 28 mN/m. A reduction in the order of the acyl chains associated with the increase in the layer thickness upon G4 binding was revealed from ER-FTIR spectroscopy, with peptide binding reaching equilibration faster in POPG than in DPPG monolayers. Whereas the dynamic DPPG-binding process displayed a steady increase in the amide I band area, the POPG-binding process showed little change in the amide area after the initial period. The peptide amide I area from ER-FTIR spectroscopy could be linearly correlated with the adsorbed G4 amount from NR, irrespective of time, initial pressure, or chain saturation, with clearly more peptide incorporated into the DPPG monolayer. Furthermore, NR revealed that although the peptide was associated with both POPG and DPPG lipid monolayers, it was more extensively distributed in the latter, showing that acyl chain saturation clearly promoted peptide binding and structural disruption.
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Affiliation(s)
- Daniela Ciumac
- Biological
Physics Laboratory, School of Physics and Astronomy, University of Manchester, Oxford Road, Schuster Building, Manchester M13 9PL, U.K.
| | - Richard A. Campbell
- Institute
of Laue Langevin, 71
Avenue des Martyrs, CS-20156, 38042 Grenoble, France
| | | | - Hai Xu
- Centre
for Bioengineering and Biotechnology, China
University of Petroleum, Qingdao 266580, China
| | - Giovanna Fragneto
- Institute
of Laue Langevin, 71
Avenue des Martyrs, CS-20156, 38042 Grenoble, France
| | - Jian R. Lu
- Biological
Physics Laboratory, School of Physics and Astronomy, University of Manchester, Oxford Road, Schuster Building, Manchester M13 9PL, U.K.
- E-mail: . Phone: +44 161 2003926 (J.R.L.)
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23
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Henderson JM, Waring AJ, Separovic F, Lee KYC. Antimicrobial Peptides Share a Common Interaction Driven by Membrane Line Tension Reduction. Biophys J 2017; 111:2176-2189. [PMID: 27851941 DOI: 10.1016/j.bpj.2016.10.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 09/30/2016] [Accepted: 10/05/2016] [Indexed: 12/30/2022] Open
Abstract
Antimicrobial peptides (AMPs) are a class of host-defense molecules that neutralize a broad range of pathogens. Their membrane-permeabilizing behavior has been commonly attributed to the formation of pores; however, with the continuing discovery of AMPs, many are uncharacterized and their exact mechanism remains unknown. Using atomic force microscopy, we previously characterized the disruption of model membranes by protegrin-1 (PG-1), a cationic AMP from pig leukocytes. When incubated with zwitterionic membranes of dimyristoylphosphocholine, PG-1 first induced edge instability at low concentrations, then porous defects at intermediate concentrations, and finally worm-like micelle structures at high concentrations. These rich structural changes suggested that pore formation constitutes only an intermediate state along the route of PG-1's membrane disruption process. The formation of these structures could be best understood by using a mesophase framework of a binary mixture of lipids and peptides, where PG-1 acts as a line-active agent in lowering interfacial bilayer tensions. We have proposed that rather than being static pore formers, AMPs share a common ability to lower interfacial tensions that promote membrane transformations. In a study of 13 different AMPs, we found that peptide line-active behavior was not driven by the overall charge, and instead was correlated with their adoption of imperfect secondary structures. These peptide structures commonly positioned charged residues near the membrane interface to promote deformation favorable for their incorporation into the membrane. Uniquely, the data showed that barrel-stave-forming peptides such as alamethicin are not line-active, and that the seemingly disparate models of toroidal pores and carpet activity are actually related. We speculate that this interplay between peptide structure and the distribution of polar residues in relation to the membrane governs AMP line activity in general and represents a novel, to our knowledge, avenue for the rational design of new drugs.
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Affiliation(s)
- J Michael Henderson
- Department of Chemistry, The University of Chicago, Chicago, Illinois; Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois; The James Frank Institute, The University of Chicago, Chicago, Illinois
| | - Alan J Waring
- Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, Torrance, California; Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - Frances Separovic
- School of Chemistry, Bio21 Institute, University of Melbourne, Melbourne, Victoria, Australia
| | - Ka Yee C Lee
- Department of Chemistry, The University of Chicago, Chicago, Illinois; Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois; The James Frank Institute, The University of Chicago, Chicago, Illinois.
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24
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Pu C, Tang W. Affinity and selectivity of anchovy antibacterial peptide for Staphylococcus aureus cell membrane lipid and its application in whole milk. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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25
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Knyght I, Clifton L, Saaka Y, Lawrence MJ, Barlow DJ. Interaction of the Antimicrobial Peptides Rhesus θ-Defensin and Porcine Protegrin-1 with Anionic Phospholipid Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7403-10. [PMID: 27357217 DOI: 10.1021/acs.langmuir.6b01688] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A combination of Langmuir isotherm, Brewster angle microscopy (BAM), and neutron reflectivity studies have been performed to gain insight into the effects on model bacterial cell membranes of the antimicrobial peptides, Rhesus θ-defensin 1 (RTD-1), and porcine protegrin 1 (PG-1). The peptides were interacted with monolayers spread at the air-water interface and prepared from a 3:1 molar mixture of phosphatidylethanolamine and phosphatidylglycerol used to approximate the cell membranes of Gram positive bacteria. The Langmuir film balance measurements show that both peptides perturb the lipid monolayers causing an increase in surface pressure, and the BAM studies show that each results in the formation of small domains within the lipid films, around 5 μm diameter. The overall change in monolayer surface pressure caused by PG-1, however, is a little more pronounced than that due to RTD-1 (+8.5 mN·m(-1) vs +5.5 mN·m(-1)), and the rate of its initial interaction with the monolayer is a little more rapid than that for RTD-1. The neutron reflectivity studies also show differences for PG-1 and RTD-1, with the model fits to these data showing that the more amphiphilic PG-1 becomes fully embedded within the lipid film-causing an extension of the lipid acyl chains but leaving the thickness of the lipid headgroup layer unaffected-while RTD-1 is seen to insert less deeply-causing the same extension of the lipid acyl chains as PG-1 but also causing a significant increase in thickness of the lipid headgroup layer. The various differing effects of the two peptides on anionic lipid monolayers are discussed in the context of their differing hemolytic activities, and their proposed differing propensities to form transmembrane pores.
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Affiliation(s)
- Ivana Knyght
- Institute of Pharmaceutical Science, King's College London , London SE1 9NH, United Kingdom
| | - Luke Clifton
- Rutherford Appleton Laboratory, ISIS Spallation Neutron Source, Harwell OX11 0QX, United Kingdom
| | - Yussif Saaka
- Institute of Pharmaceutical Science, King's College London , London SE1 9NH, United Kingdom
| | - M Jayne Lawrence
- Institute of Pharmaceutical Science, King's College London , London SE1 9NH, United Kingdom
| | - David J Barlow
- Institute of Pharmaceutical Science, King's College London , London SE1 9NH, United Kingdom
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26
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Aoki PHB, Morato LFC, Pavinatto FJ, Nobre TM, Constantino CJL, Oliveira ON. Molecular-Level Modifications Induced by Photo-Oxidation of Lipid Monolayers Interacting with Erythrosin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3766-3773. [PMID: 27017835 DOI: 10.1021/acs.langmuir.6b00693] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Incorporation into cell membranes is key for the action of photosensitizers in photomedicine treatments, with hydroperoxidation as the prominent pathway of lipid oxidation. In this paper, we use Langmuir monolayers of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) as cell membrane models to investigate adsorption of the photosensitizer erythrosin and its effect on photoinduced lipid oxidation. From surface pressure isotherms and polarization-modulated infrared reflection-absorption spectroscopy (PM-IRRAS) data, erythrosin was found to adsorb mainly via electrostatic interaction with the choline in the head groups of both DOPC and DPPC. It caused larger monolayer expansion in DOPC, with possible penetration into the hydrophobic unsaturated chains, while penetration into the DPPC saturated chains was insignificant. Easier penetration is due to the less packed DOPC monolayer, in comparison to the more compact DPPC according to the monolayer compressibility data. Most importantly, light irradiation at 530 nm made the erythrosin-containing DOPC monolayer become less unstable, with a relative surface area increase of ca. 19%, in agreement with previous findings for bioadhesive giant vesicles. The relative area increase is consistent with hydroperoxidation, supporting the erythrosin penetration into the lipid chains, which favors singlet oxygen generation close to double bonds, an important requirement for photodynamic efficiency.
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Affiliation(s)
- Pedro H B Aoki
- IFSC, São Carlos Institute of Physics, University of São Paulo (USP) , São Carlos, SP, Brazil 13566-590
- DCB, Faculdade de Ciências e Letras, UNESP Univ Estadual Paulista , Assis, SP, Brazil 19806-900
| | - Luis F C Morato
- DF, Faculdade de Ciências e Tecnologia, UNESP Univ Estadual Paulista , Presidente Prudente, SP, Brazil 19060-900
| | - Felippe J Pavinatto
- IFSC, São Carlos Institute of Physics, University of São Paulo (USP) , São Carlos, SP, Brazil 13566-590
| | - Thatyane M Nobre
- IFSC, São Carlos Institute of Physics, University of São Paulo (USP) , São Carlos, SP, Brazil 13566-590
| | - Carlos J L Constantino
- DF, Faculdade de Ciências e Tecnologia, UNESP Univ Estadual Paulista , Presidente Prudente, SP, Brazil 19060-900
| | - Osvaldo N Oliveira
- IFSC, São Carlos Institute of Physics, University of São Paulo (USP) , São Carlos, SP, Brazil 13566-590
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Zughaier SM, Svoboda P, Pohl J. Structure-Dependent Immune Modulatory Activity of Protegrin-1 Analogs. Antibiotics (Basel) 2016; 3:694-713. [PMID: 26097747 PMCID: PMC4472440 DOI: 10.3390/antibiotics3040694] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Protegrins are porcine antimicrobial peptides (AMPs) that belong to the cathelicidin family of host defense peptides. Protegrin-1 (PG-1), the most investigated member of the protegrin family, is an arginine-rich peptide consisting of 18 amino acid residues, its main chain adopting a β-hairpin structure that is linked by two disulfide bridges. We report on the immune modulatory activity of PG-1 and its analogs in neutralizing bacterial endotoxin and capsular polysaccharides, consequently inhibiting inflammatory mediators’ release from macrophages. We demonstrate that the β-hairpin structure motif stabilized with at least one disulfide bridge is a prerequisite for the immune modulatory activity of this type of AMP.
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Affiliation(s)
- Susu M. Zughaier
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA
- Laboratories of Microbial Pathogenesis, Atlanta Department of Veterans Affairs Medical Center, Atlanta, GA 30033, USA
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-404-321-6111 (ext. 12461); Fax: +1-404-329-2210
| | - Pavel Svoboda
- Microchemical and Proteomics Facility, Emory University School of Medicine, Atlanta, GA 30322, USA; E-Mails: (P.S.); (J.P.)
- Biotechnology Core Facility Branch, Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
| | - Jan Pohl
- Microchemical and Proteomics Facility, Emory University School of Medicine, Atlanta, GA 30322, USA; E-Mails: (P.S.); (J.P.)
- Biotechnology Core Facility Branch, Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
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28
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Ganesan SJ, Xu H, Matysiak S. Effect of lipid head group interactions on membrane properties and membrane-induced cationic β-hairpin folding. Phys Chem Chem Phys 2016; 18:17836-50. [DOI: 10.1039/c5cp07669b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Stages in membrane induced SVS-1 folding.
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Affiliation(s)
- Sai J. Ganesan
- Fischell Department of Bioengineering
- University of Maryland
- College Park
- USA
| | - Hongcheng Xu
- Biophysics Program
- University of Maryland
- College Park
- USA
| | - Silvina Matysiak
- Fischell Department of Bioengineering
- University of Maryland
- College Park
- USA
- Biophysics Program
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29
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Yacoub HA, El-Hamidy SM, Mahmoud MM, Baeshen MN, Almehdar HA, Uversky VN, Redwan EM, Al-Maghrabi OA, Elazzazy AM. Biocidal activity of chicken defensin-9 against microbial pathogens. Biochem Cell Biol 2015; 94:176-87. [PMID: 26914652 DOI: 10.1139/bcb-2015-0121] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
In this study we identified the expression patterns of β-defensin-9 in chickens from Saudi Arabia, evaluated the antimicrobial activities of synthetic chicken β-defensin-9 (sAvBD-9) against pathogenic bacteria and fungi, and investigated the mode of action of sAvBD-9 on bacterial cells. The AvBD-9 gene of Saudi chickens encodes a polypeptide of 67 amino acids, which is highly similar to the polypeptide in duck, quail, and goose (97%, 86%, and 87%, respectively) and shares a low sequence similarity with the mammalian defensins. AvBD-9 is expressed in various organs and tissues of Saudi chickens and inhibits the growth of both Gram-negative and Gram-positive bacteria, as well as showing activity against unicellular and multicellular fungi (Aspergillus flavus, A. niger, and Candida albicans). sAvBD-9 completely inhibited the growth of both Gram-positive and Gram-negative bacterial strains as well as Candida albicans. The haemolytic effects of sAvBD-9 were limited. Morphological analysis by TEM revealed that sAvBD-9 induces shortening and swelling of Staphylococcus aureus and Shigella sonni cells, opens holes and deep craters in their envelopes, and leads to the release of their cytoplasmic content. Our data shed light on the potential applications of sAvBD-9 in the pharmaceutical industry.
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Affiliation(s)
- Haitham A Yacoub
- a Biological Sciences Department, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia.,b Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,c National Research Centre, Dokki, Gizza, P.O. Box 12622, Egypt
| | - Salem M El-Hamidy
- b Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Maged M Mahmoud
- d King Fahd Medical Research Center, King Abdulaziz University, P.O. Box 80216, Jeddah 21589, Saudi Arabia.,i Department of Molecular Genetics and Enzymology, Devision of Human Genetocs and Genome Research, National Research Centre, Dokki, Gizza, P.O. Box 12622, Egypt
| | - Mohamed Nabih Baeshen
- a Biological Sciences Department, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia.,b Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Hussein A Almehdar
- b Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Vladimir N Uversky
- b Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,e Institute for Biological Instrumentation, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia.,g Department of Molecular Medicine and USF Health Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, Tampa, Florida, USA
| | - Elrashdy M Redwan
- b Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,f Therapeutic and Protective Proteins Laboratory, Protein Research Department, Genetic Engineering and Biotechnology Research Institute, City for Scientific Research and Technology Applications, New Borg EL-Arab 21934, Alexandria, Egypt
| | - Omar A Al-Maghrabi
- a Biological Sciences Department, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia
| | - Ahmed M Elazzazy
- a Biological Sciences Department, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia.,h Department of Chemistry of Natural and Microbial Products, Division of Pharmaceutical and Drug Industries, National Research Centre, Dokki, Gizza, P.O. Box 12622, Egypt
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Effects of Leucin-Enkephalins on Surface Characteristics and Morphology of Model Membranes Composed of Raft-Forming Lipids. J Membr Biol 2015; 249:229-38. [DOI: 10.1007/s00232-015-9862-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 11/28/2015] [Indexed: 12/21/2022]
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31
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Hädicke A, Blume A. Binding of Short Cationic Peptides (KX)4K to Negatively Charged DPPG Monolayers: Competition between Electrostatic and Hydrophobic Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12203-12214. [PMID: 26479457 DOI: 10.1021/acs.langmuir.5b02882] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The influence of the peptide sequence on the binding of short cationic peptides composed of five lysines alternating with uncharged amino acids within the series (KX)4K to negatively charged monolayers of 1,2-dipalmitoyl-sn-glycero-3-phosphoglycerol (DPPG) was investigated by adsorption experiments in combination with epifluorescence microscopy. To evaluate the impact of electrostatic and hydrophobic contributions, different uncharged amino acids X with increasing hydrophobicity, where X = G (glycine), A (alanine), Abu (α-aminobutyric acid), V (valine), or L (leucine) were introduced into the peptide sequence to tune the peptide hydrophobicity. The adsorption kinetics of these peptides to a DPPG monolayer always showed two superimposed processes, one leading to an increase and another to a decrease of the surface pressure Π. Thus, the plots of the change in Π after peptide binding vs initial surface pressure of the monolayer showed an unusual behavior with maxima and negative changes in Π at high initial Π values. Epifluorescence microscopy confirmed that electrostatic binding of the peptides with a concomitant decrease in Π leads to a condensation of the lipid monolayer and the formation of liquid-condensed (LC) domains even at Π values where the monolayer is supposedly in the liquid-expanded (LE) state. An increase in hydrophobicity of the amino acid X was found to counteract the condensation and an increase in Π upon peptide binding is observed at low Π values, also concomitant with the formation of LC-domains. Compression of monolayers after peptide adsorption at low surface pressure for 4 h leads to a change of the isotherms compared to pure DPPG isotherms. The phase transition of DPPG from LE to LC state is smeared out or is shifted to higher surface pressure. Considerable changes in the shapes of LC-domains were observed after peptide binding. Growth of the LC-domains was hindered in most cases and regular domain patterns were formed. Binding of (KL)4K leads to a decrease in line tension and the formation of extended filaments protruding from initially circular domains.
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Affiliation(s)
- André Hädicke
- Institute of Chemistry, MLU Halle-Wittenberg , von-Danckelmann-Platz 4, 06120 Halle/Saale, Germany
| | - Alfred Blume
- Institute of Chemistry, MLU Halle-Wittenberg , von-Danckelmann-Platz 4, 06120 Halle/Saale, Germany
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32
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Yacoub HA, Elazzazy AM, Abuzinadah OAH, Al-Hejin AM, Mahmoud MM, Harakeh SM. Antimicrobial activities of chicken β-defensin (4 and 10) peptides against pathogenic bacteria and fungi. Front Cell Infect Microbiol 2015; 5:36. [PMID: 25941665 PMCID: PMC4400880 DOI: 10.3389/fcimb.2015.00036] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Accepted: 03/29/2015] [Indexed: 01/03/2023] Open
Abstract
Host Defense Peptides (HDPs) are small cationic peptides found in several organisms. They play a vital role in innate immunity response and immunomodulatory stimulation. This investigation was designed to study the antimicrobial activities of β-defensin peptide-4 (sAvBD-4) and 10 (sAvBD-4) derived from chickens against pathogenic organisms including bacteria and fungi. Ten bacterial strains and three fungal species were used in investigation. The results showed that the sAvBD-10 displayed a higher bactericidal potency against all the tested bacterial strains than that of sAvBD-4. The exhibited bactericidal activity was significant against almost the different bacterial strains at different peptide concentrations except for that of Pseudomonas aeruginosa (P. aeruginosa) and Streptococcus bovis (Str. bovis) strains where a moderate effect was noted. Both peptides were effective in the inactivation of fungal species tested yielding a killing rate of up to 95%. The results revealed that the synthetic peptides were resistant to salt at a concentration of 50 mM NaCl. However, they lost antimicrobial potency when applied in the presence of high salt concentrations. Based on blood hemolysis studies, a little hemolytic effect was showed in the case of both peptides even when applied at high concentrations. The data obtained from this study indicated that synthetic avian peptides exhibit strong antibacterial and antifungal activity. In conclusion, future work and research should be tailored to a better understanding of the mechanisms of action of those peptides and their potential use in the pharmaceutical industry to help reduce the incidence and impact of infectious agent and be marketed as a naturally occurring antibiotic.
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Affiliation(s)
- Haitham A Yacoub
- Biological Sciences Department, Faculty of Sciences, King Abdulaziz University Jeddah, Saudi Arabia ; Genetic Engineering and Biotechnology Division, Cell Biology Department, National Research Centre Gizza, Egypt
| | - Ahmed M Elazzazy
- Biological Sciences Department, Faculty of Science, University of Jeddah Jeddah, Saudi Arabia ; Division of Pharmaceutical and Drug Industries, Department of Chemistry of Natural and Microbial Products, National Research Centre Gizza, Egypt
| | - Osama A H Abuzinadah
- Biological Sciences Department, Faculty of Sciences, King Abdulaziz University Jeddah, Saudi Arabia
| | - Ahmed M Al-Hejin
- Biological Sciences Department, Faculty of Sciences, King Abdulaziz University Jeddah, Saudi Arabia
| | - Maged M Mahmoud
- King Fahd Medical Research Center, King Abdulaziz University Jeddah, Saudi Arabia ; Division of Human Genetics and Genome Research, Department of Molecular Genetics and Enzymology, National Research Centre Gizza, Egypt
| | - Steve M Harakeh
- Special Infectious Agents Unit, King Fahd Medical Research Center, King Abdulaziz University Jeddah, Saudi Arabia
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33
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Affinities and in-plane stress forces between glycopeptide antibiotics and biomimetic bacterial membranes. SENSING AND BIO-SENSING RESEARCH 2015. [DOI: 10.1016/j.sbsr.2014.10.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Effect of recombinant prophenin 2 on the integrity and viability of Trichomonas vaginalis. BIOMED RESEARCH INTERNATIONAL 2015; 2015:430436. [PMID: 25815316 PMCID: PMC4359812 DOI: 10.1155/2015/430436] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 09/26/2014] [Indexed: 11/17/2022]
Abstract
Trichomonas vaginalis is the causal agent of trichomoniasis, which is associated with preterm child delivery, low birth weight, and an increased risk of infection by human papilloma virus and human immunodeficiency virus following exposure. Several reports have established increasing numbers of trichomoniasis cases resistant to metronidazole, the agent used for treatment, and it is therefore important to identify new therapeutic alternatives. Previously, our group reported the effect of tritrpticin, a synthetic peptide derived from porcine prophenin, on T. vaginalis; however, the hemolytic activity of this small peptide complicates its possible use as a therapeutic agent. In this study, we report that the propeptide and the processed peptide of prophenin 2 (cleaved with hydroxylamine) affected the integrity and growth of T. vaginalis and that pro-prophenin 2 displays some resistance to proteolysis by T. vaginalis proteinases at 1 h. Its effect on T. vaginalis as well as its low hemolytic activity and short-time stability to parasite proteinases makes prophenin 2 an interesting candidate for synergistic or alternative treatment against T. vaginalis.
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35
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Borkar MR, Pissurlenkar RRS, Coutinho EC. Mapping activity elements of protegrin antimicrobial peptides by HomoSAR. RSC Adv 2015. [DOI: 10.1039/c5ra14402g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
HomoSAR has been able to shed light on the relationship between sequences of protegrin peptides and their activity on six specific micro-organisms.
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Affiliation(s)
| | | | - Evans C. Coutinho
- Department of Pharmaceutical Chemistry
- Bombay College of Pharmacy
- Mumbai 400098
- India
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36
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Lipkin RB, Lazaridis T. Implicit Membrane Investigation of the Stability of Antimicrobial Peptide β-Barrels and Arcs. J Membr Biol 2014; 248:469-86. [PMID: 25430621 DOI: 10.1007/s00232-014-9759-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 11/18/2014] [Indexed: 12/31/2022]
Abstract
Previous simulations showed that the β-hairpin antimicrobial peptide (AMP) protegrin-1 can form stable octameric β-barrels and tetrameric arcs (half barrels) in both implicit and explicit membranes. Here, we extend this investigation to several AMPs of similar structure: tachyplesin, androctonin, polyphemusin, gomesin, and the retrocyclin θ-defensin. These peptides form short β-hairpins stabilized by 2-3 disulfide bonds. We also examine synthetic β-sheet peptides selected from a combinatorial library for their ability or inability to form pores in lipid membranes. When heptameric, octameric, and decameric β-barrels and tetrameric arcs of these peptides were embedded in pre-formed neutral or anionic lipid pores (i.e., pores in neutral or anionic membranes, respectively), a variety of behaviors and membrane binding energies were observed. Due to the cationic charge of the peptides, more favorable transfer energies and more stable binding were observed in anionic than neutral pores. The synthetic peptides bound very strongly and formed stable barrels and arcs in both neutral and anionic pores. The natural AMPs exhibited unfavorable or marginally favorable binding energy and kinetic stability in neutral pores, consistent with the lower hemolytic activity of some of them compared with protegrin-1. Binding to anionic pores was more favorable, but significant distortions of the barrel or arc structures were sometimes noted. These results are discussed in light of the available experimental data. The diversity of behaviors obtained makes it unlikely that the barrel and arc mechanisms are valid for the entire family of β-hairpin AMPs.
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Affiliation(s)
- Richard B Lipkin
- Department of Chemistry, City College of the City University of New York, 160 Convent Ave., New York, NY, 10031, USA
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Derde M, Nau F, Lechevalier V, Guérin-Dubiard C, Paboeuf G, Jan S, Baron F, Gautier M, Vié V. Native lysozyme and dry-heated lysozyme interactions with membrane lipid monolayers: lateral reorganization of LPS monolayer, model of the Escherichia coli outer membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1848:174-83. [PMID: 25450345 DOI: 10.1016/j.bbamem.2014.10.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 09/26/2014] [Accepted: 10/20/2014] [Indexed: 01/24/2023]
Abstract
Lysozyme is mainly described active against Gram-positive bacteria, but is also efficient against some Gram-negative species. Especially, it was recently demonstrated that lysozyme disrupts Escherichia coli membranes. Moreover, dry-heating changes the physicochemical properties of the protein and increases the membrane activity of lysozyme. In order to elucidate the mode of insertion of lysozyme into the bacterial membrane, the interaction between lysozyme and a LPS monolayer mimicking the E. coli outer membrane has been investigated by tensiometry, ellipsometry, Brewster angle microscopy and atomic force microscopy. It was thus established that lysozyme has a high affinity for the LPS monolayer, and is able to insert into the latter as long as polysaccharide moieties are present, causing reorganization of the LPS monolayer. Dry-heating increases the lysozyme affinity for the LPS monolayer and its insertion capacity; the resulting reorganization of the LPS monolayer is different and more drastic than with the native protein.
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Affiliation(s)
- Melanie Derde
- Agrocampus Ouest, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France; INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France.
| | - Françoise Nau
- Agrocampus Ouest, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France; INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
| | - Valérie Lechevalier
- Agrocampus Ouest, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France; INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
| | - Catherine Guérin-Dubiard
- Agrocampus Ouest, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France; INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
| | - Gilles Paboeuf
- Université de Rennes 1, Institut de Physique de Rennes, UMR6251, CNRS, F-35042 Rennes, France
| | - Sophie Jan
- Agrocampus Ouest, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France; INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
| | - Florence Baron
- Agrocampus Ouest, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France; INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
| | - Michel Gautier
- Agrocampus Ouest, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France; INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
| | - Véronique Vié
- Université de Rennes 1, Institut de Physique de Rennes, UMR6251, CNRS, F-35042 Rennes, France.
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Dennison SR, Phoenix DA. Susceptibility of sheep, human, and pig erythrocytes to haemolysis by the antimicrobial peptide Modelin 5. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2014; 43:423-32. [DOI: 10.1007/s00249-014-0974-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 06/02/2014] [Accepted: 07/01/2014] [Indexed: 11/29/2022]
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Lhor M, Bernier SC, Horchani H, Bussières S, Cantin L, Desbat B, Salesse C. Comparison between the behavior of different hydrophobic peptides allowing membrane anchoring of proteins. Adv Colloid Interface Sci 2014; 207:223-39. [PMID: 24560216 PMCID: PMC4028306 DOI: 10.1016/j.cis.2014.01.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 01/11/2014] [Accepted: 01/13/2014] [Indexed: 10/25/2022]
Abstract
Membrane binding of proteins such as short chain dehydrogenase reductases or tail-anchored proteins relies on their N- and/or C-terminal hydrophobic transmembrane segment. In this review, we propose guidelines to characterize such hydrophobic peptide segments using spectroscopic and biophysical measurements. The secondary structure content of the C-terminal peptides of retinol dehydrogenase 8, RGS9-1 anchor protein, lecithin retinol acyl transferase, and of the N-terminal peptide of retinol dehydrogenase 11 has been deduced by prediction tools from their primary sequence as well as by using infrared or circular dichroism analyses. Depending on the solvent and the solubilization method, significant structural differences were observed, often involving α-helices. The helical structure of these peptides was found to be consistent with their presumed membrane binding. Langmuir monolayers have been used as membrane models to study lipid-peptide interactions. The values of maximum insertion pressure obtained for all peptides using a monolayer of 1,2-dioleoyl-sn-glycero-3-phospho-ethanolamine (DOPE) are larger than the estimated lateral pressure of membranes, thus suggesting that they bind membranes. Polarization modulation infrared reflection absorption spectroscopy has been used to determine the structure and orientation of these peptides in the absence and in the presence of a DOPE monolayer. This lipid induced an increase or a decrease in the organization of the peptide secondary structure. Further measurements are necessary using other lipids to better understand the membrane interactions of these peptides.
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Affiliation(s)
- Mustapha Lhor
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Sarah C Bernier
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Habib Horchani
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Sylvain Bussières
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Line Cantin
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Bernard Desbat
- CBMN-UMR 5248 CNRS, Université de Bordeaux, IPB, Allée Geoffroy Saint Hilaire, 33600 Pessac, France
| | - Christian Salesse
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada.
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Langmuir–Blodgett Approach to Investigate Antimicrobial Peptide–Membrane Interactions. ADVANCES IN PLANAR LIPID BILAYERS AND LIPOSOMES 2014. [DOI: 10.1016/b978-0-12-418698-9.00003-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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41
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Rothan HA, Mohamed Z, Sasikumar PG, Reddy KA, Rahman NA, Yusof R. In Vitro Characterization of Novel Protegrin-1 Analogues Against Neoplastic Cells. Int J Pept Res Ther 2013. [DOI: 10.1007/s10989-013-9388-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Tsanova A, Jordanova A, Dzimbova T, Pajpanova T, Golovinsky E, Lalchev Z. Interaction of methionine-enkephalins with raft-forming lipids: monolayers and BAM experiments. Amino Acids 2013; 46:1159-68. [PMID: 24357114 DOI: 10.1007/s00726-013-1647-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2013] [Accepted: 12/11/2013] [Indexed: 12/27/2022]
Abstract
Enkephalins (Tyr-Gly-Gly-Phe-Met/Leu) are opioid peptides with proven antinociceptive action in organism. They interact with opioid receptors belonging to G-protein coupled receptor superfamily. It is known that these receptors are located preferably in membrane rafts composed mainly of sphingomyelin (Sm), cholesterol (Cho), and phosphatidylcholine. In the present work, using Langmuir's monolayer technique in combination with Wilhelmy's method for measuring the surface pressure, the interaction of synthetic methionine-enkephalin and its amidated derivative with 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), Sm, and Cho, as well as with their double and triple mixtures, was studied. From the pressure/area isotherms measured, the compressional moduli of the lipids and lipid-peptide monolayers were determined. Our results showed that the addition of the synthetic enkephalins to the monolayers studied led to change in the lipid monolayers characteristics, which was more evident in enkephalinamide case. In addition, using Brewster angle microscopy (BAM), the surface morphology of the lipid monolayers, before and after the injection of both enkephalins, was determined. The BAM images showed an increase in surface density of the mixed surface lipids/enkephalins films, especially with double and triple component lipid mixtures. This effect was more pronounced for the enkephalinamide as well. These observations showed that there was an interaction between the peptides and the raft-forming lipids, which was stronger for the amidated peptide, suggesting a difference in folding of both enkephalins. Our research demonstrates the potential of lipid monolayers for elegant and simple membrane models to study lipid-peptide interactions at the plane of biomembranes.
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Affiliation(s)
- A Tsanova
- Faculty of Medicine, St. Kliment Ohridski University of Sofia, 1 Kozyak Str., 1407, Sofia, Bulgaria,
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43
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Ma D, Zhang M, Zhang K, Liu X, Han Z, Shao Y, Liu S. Identification of three novel avian beta-defensins from goose and their significance in the pathogenesis of Salmonella. Mol Immunol 2013; 56:521-9. [DOI: 10.1016/j.molimm.2013.05.227] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 04/29/2013] [Accepted: 05/20/2013] [Indexed: 01/25/2023]
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44
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Burton MG, Huang QM, Hossain MA, Wade JD, Clayton AHA, Gee ML. Long-time-scale interaction dynamics between a model antimicrobial peptide and giant unilamellar vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14613-14621. [PMID: 24168523 DOI: 10.1021/la403083m] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The interaction dynamics between a lytic peptide and a biomembrane was studied using time-lapse fluorescence lifetime imaging microscopy. The model membrane was 1,2-dipalmitoyl-sn-glycero-3-phosphochloine giant unilamellar vesicles (GUVs), and the peptide was the K14 derivative of melittin, to which the polarity-sensitive fluorescent probe AlexaFluor 430 was grafted. The interaction of the peptide with the GUVs resulted in a progressive quenching of the fluorescence lifetime over a period of minutes. From previous photophysics characterization of the peptide, we were able to deconvolve the contribution of three distinct peptide states to the lifetime trajectory and use this data to develop a kinetics model for the interaction process. It was found that the peptide-membrane interaction was well described by a two-step mechanism: peptide monomer adsorption followed by membrane surface migration, assembly, and insertion to form membrane pores. There was an equilibrium exchange between pore and surface monomers at all lipid/peptide (L/P) concentration ratios, suggesting that the fully inserted phase was reached, even at low peptide concentrations. In contrast to previous studies, there was no evidence of critical behavior; irrespective of L/P ratio, lytic pores were the dominant peptide state at equilibrium and were formed even at very low peptide concentrations. We suggest that this behavior is seen in GUVs because their low curvature means low Laplace pressure. Membrane elasticity is therefore relatively ineffective at damping the thermal fluctuations of lipid molecules that lead to random molecular-level lipid protrusions and membrane undulations. The transient local membrane deformations that result from these thermal fluctuations create the conditions necessary for facile peptide insertion.
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Affiliation(s)
- Matthew G Burton
- School of Chemistry and ‡Florey Department of Neuroscience and Mental Health, Centre for Neuroscience Research Chemistry, University of Melbourne , Parkville, Victoria 3010, Australia
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45
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Lazaridis T, He Y, Prieto L. Membrane interactions and pore formation by the antimicrobial peptide protegrin. Biophys J 2013; 104:633-42. [PMID: 23442914 DOI: 10.1016/j.bpj.2012.12.038] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2012] [Revised: 12/06/2012] [Accepted: 12/21/2012] [Indexed: 11/18/2022] Open
Abstract
Protegrin is an antimicrobial peptide with a β-hairpin structure stabilized by a pair of disulfide bonds. It has been extensively studied by solid-state NMR and computational methods. Here we use implicit membrane models to examine the binding of monomers on the surface and in the interior of the membrane, the energetics of dimerization, the binding to membrane pores, and the stability of different membrane barrel structures in pores. Our results challenge a number of conclusions based on previous experimental and theoretical work. The burial of monomers into the membrane interior is found to be unfavorable for any membrane thickness. Because of its imperfect amphipathicity, protegrin binds weakly, at most, on the surface of zwitterionic membranes. However, it binds more favorably onto toroidal pores. Anionic charge on the membrane facilitates the binding due to electrostatic interactions. Solid-state NMR results have suggested a parallel NCCN association of monomers in dimers and association of dimers to form octameric or decameric β-barrels. We find that this structure is not energetically plausible for binding to bilayers, because in this configuration the hydrophobic sides of two monomers point in opposite directions. In contrast, the antiparallel NCCN and especially the parallel NCNC octamers are stable and exhibit a favorable binding energy to the pore. The results of 100-ns simulations in explicit bilayers corroborate the higher stability of the parallel NCNC barrel compared with the parallel NCCN barrel. The ability to form pores in zwitterionic membranes provides a rationalization for the peptide's cytotoxicity. The discrepancies between our results and experiment are discussed, and new experiments are proposed to resolve them and to test the validity of the models.
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Affiliation(s)
- Themis Lazaridis
- Department of Chemistry, City College of New York/CUNY, New York, New York, USA.
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46
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Hu H, Wang C, Guo X, Li W, Wang Y, He Q. Broad activity against porcine bacterial pathogens displayed by two insect antimicrobial peptides moricin and cecropin B. Mol Cells 2013; 35:106-14. [PMID: 23456332 PMCID: PMC3887904 DOI: 10.1007/s10059-013-2132-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 11/18/2012] [Accepted: 11/20/2012] [Indexed: 12/13/2022] Open
Abstract
In response to infection, insects produce a variety of antimicrobial peptides (AMPs) to kill the invading pathogens. To study their physicochemical properties and bioactivities for clinical and commercial use in the porcine industry, we chemically synthesized the mature peptides Bombyx mori moricin and Hyalophora cecropia cecropin B. In this paper, we described the antimicrobial activity of the two AMPs. Moricin exhibited antimicrobial activity on eight strains tested with minimal inhibitory concentration values (MICs) ranging between 8 and 128 μg/ml, while cecropin B mainly showed antimicrobial activity against the Gramnegative strains with MICs ranging from 0.5 to 16 μg/ml. Compared to the potent antimicrobial activity these two AMPs displayed against most of the bacterial pathogens tested, they exhibited limited hemolytic activity against porcine red blood cells. The activities of moricin and cecropin B against Haemophilus parasuis SH 0165 were studied in further detail. Transmission electron microscopy (TEM) of moricin and cecropin B treated H. parasuis SH 0165 indicated extensive damage to the membranes of the bacteria. Insights into the probable mechanism utilized by moricin and cecropin B to eliminate pathogens are also presented. The observations from this study are important for the future application of AMPs in the porcine industry.
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Affiliation(s)
- Han Hu
- State Key Laboratory of Agricultural Microbiology, Division of Animal Infectious Disease, Huazhong Agricultural University, Wuhan, Hubei,
China
| | - Chunmei Wang
- State Key Laboratory of Agricultural Microbiology, Division of Animal Infectious Disease, Huazhong Agricultural University, Wuhan, Hubei,
China
| | - Xiaozhen Guo
- State Key Laboratory of Agricultural Microbiology, Division of Animal Infectious Disease, Huazhong Agricultural University, Wuhan, Hubei,
China
| | - Wentao Li
- State Key Laboratory of Agricultural Microbiology, Division of Animal Infectious Disease, Huazhong Agricultural University, Wuhan, Hubei,
China
| | - Yang Wang
- State Key Laboratory of Agricultural Microbiology, Division of Animal Infectious Disease, Huazhong Agricultural University, Wuhan, Hubei,
China
| | - Qigai He
- State Key Laboratory of Agricultural Microbiology, Division of Animal Infectious Disease, Huazhong Agricultural University, Wuhan, Hubei,
China
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47
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Interfacial behavior of chroman-6 and chroman-6 palmitoyl ester and their interaction with phospholipids. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2829-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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48
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Does cholesterol suppress the antimicrobial peptide induced disruption of lipid raft containing membranes? BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:3019-24. [PMID: 22885355 DOI: 10.1016/j.bbamem.2012.07.021] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 07/23/2012] [Accepted: 07/25/2012] [Indexed: 11/20/2022]
Abstract
The activity of antimicrobial peptides has been shown to depend on the composition of the target cell membrane. The bacterial selectivity of most antimicrobial peptides has been attributed to the presence of abundant acidic phospholipids and the absence of cholesterol in bacterial membranes. The high amount of cholesterol present in eukaryotic cell membranes is thought to prevent peptide-induced membrane disruption by increasing the cohesion and stiffness of the lipid bilayer membrane. While the role of cholesterol on an antimicrobial peptide-induced membrane disrupting activity has been reported for simple, homogeneous lipid bilayer systems, it is not well understood for complex, heterogeneous lipid bilayers exhibiting phase separation (or "lipid rafts"). In this study, we show that cholesterol does not inhibit the disruption of raft-containing 1,2-dioleoyl-sn-glycero-3-phosphocholine:1,2-dipalmitoyol-sn-glycero-3-phosphocholine model membranes by four different cationic antimicrobial peptides, MSI-78, MSI-594, MSI-367 and MSI-843 which permeabilize membranes. Conversely, the presence of cholesterol effectively inhibits the disruption of non-raft containing 1,2-dioleoyl-sn-glycero-3-phosphocholine or 1,2-dipalmitoyol-sn-glycero-3-phosphocholine lipid bilayers, even for antimicrobial peptides that do not show a clear preference between the ordered gel and disordered liquid-crystalline phases. Our results show that the peptide selectivity is not only dependent on the lipid phase but also on the presence of phase separation in heterogeneous lipid systems.
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Nsimba Zakanda F, Lins L, Nott K, Paquot M, Mvumbi Lelo G, Deleu M. Interaction of hexadecylbetainate chloride with biological relevant lipids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3524-33. [PMID: 22263671 DOI: 10.1021/la2040328] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The present work investigates the interaction of hexadecylbetainate chloride (C(16)BC), a glycine betaine-based ester with palmitoyl-oleoyl-phosphatidylcholine (POPC), sphingomyelin (SM), and cholesterol (CHOL), three biological relevant lipids present in the outer leaflet of the mammalian plasma membrane. The binding affinity and the mixing behavior between the lipids and C(16)BC are discussed based on experimental (isothermal titration calorimetry (ITC) and Langmuir film balance) and molecular modeling studies. The results show that the interaction between C(16)BC and each lipid is thermodynamically favorable and does not affect the integrity of the lipid vesicles. The primary adsorption of C(16)BC into the lipid film is mainly governed by a hydrophobic effect. Once C(16)BC is inserted in the lipid film, the polar component of the interaction energy between C(16)BC and the lipid becomes predominant. Presence of CHOL increases the affinity of C(16)BC for membrane. This result can be explained by the optimal matching between C(16)BC and CHOL within the film rather by a change of membrane fluidity due to the presence of CHOL. The interaction between C(16)BC and SM is also favorable and gives rise to highly stable monolayers probably due to hydrogen bonds between their hydrophilic groups. The interaction of C(16)BC with POPC is less favorable but does not destabilize the mixed monolayer from a thermodynamic point of view. Interestingly, for all the monolayers investigated, the exclusion surface pressures are above the presumed lateral pressure of the plasma membranes suggesting that C(16)BC would be able to penetrate into mammalian plasma membranes in vivo. These results may serve as a useful basis in understanding the interaction of C(16)BC with real membranes.
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Affiliation(s)
- F Nsimba Zakanda
- Unité de Chimie Biologique Industrielle, Gembloux Agro-Bio Tech-University of Liege, Passage des Déportés 2, 5030 Gembloux, Belgium
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50
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Ningsih Z, Hossain MA, Wade JD, Clayton AHA, Gee ML. Slow insertion kinetics during interaction of a model antimicrobial peptide with unilamellar phospholipid vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2217-2224. [PMID: 22148887 DOI: 10.1021/la203770j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The mechanism of interaction between a model antimicrobial peptide and phospholipid unilamellar vesicle membranes was studied using fluorescence spectroscopy, fluorescence lifetime measurements, and light scattering. The peptide, a mellitin mutant, was labeled at position K14 with the polarity-sensitive probe AlexaFluor 430. The kinetics of the interaction of this derivative with various concentrations of 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) vesicles was examined. Our work unveiled two novel aspects of peptide-lipid interactions. First, the AB plot or phasor analysis of the fluorescence lifetime studies revealed at least three different peptide states, the population of which depended on the lipid to peptide (L:P) concentration ratio. Second, complex fluorescence kinetics were observed over extended time-scales from 30 s to 2 h. The extended kinetics was only observed at particular lipid concentrations (L:P ratios 20:1 and 10:1) and not at others (30, 40, 50 and 100:1 L:P ratio). Analysis of the complex kinetics revealed several intermediates. We assign these to distinct states of the peptide formed during helix insertion into the vesicle membrane that are intermediate to lytic pore formation.
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Affiliation(s)
- Zubaidah Ningsih
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
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