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Youssef H, DeWolf CE. Interfacial Self-Assembly of Antimicrobial Peptide GL13K into Non-Fibril Crystalline β-Sheets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:660-665. [PMID: 31880463 DOI: 10.1021/acs.langmuir.9b03120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The need for new and potent antibiotics in an era of increasing multidrug resistance in bacteria has driven the search for new antimicrobial agents, including the design of synthetic antimicrobial peptides (AMPs). While a number of β-sheet forming AMPs have been proposed, their similarity to β-amyloids raises a number of concerns associated with neurodegenerative states. GL13K is an effective, synthetic AMP that selectively folds into β-sheets at anionic interfaces. Moreover, it is one of relatively few AMPs that preferentially fold into β-sheets without bridging disulfides. The interfacial activity of GL13K and its propensity to form amyloid fibrils have not been investigated. Using structural studies at the air/water interface and in the absence of anionic lipids, we demonstrate that while GL13K does form crystalline β-sheets, it does not self-assemble into fibrils. This work emphasizes the requirement for a single charged amino acid in the hydrophobic face to prevent fibril formation in synthetic peptides.
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Affiliation(s)
- Hala Youssef
- Department of Chemistry and Biochemistry and Centre for NanoScience Research , Concordia University , 7141 Sherbrooke Street West , Montreal H4B 1R6 , Canada
| | - Christine E DeWolf
- Department of Chemistry and Biochemistry and Centre for NanoScience Research , Concordia University , 7141 Sherbrooke Street West , Montreal H4B 1R6 , Canada
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Ulaganathan V, Del Castillo L, Webber JL, Ho TT, Ferri JK, Krasowska M, Beattie DA. The influence of pH on the interfacial behaviour of Quillaja bark saponin at the air-solution interface. Colloids Surf B Biointerfaces 2019; 176:412-419. [DOI: 10.1016/j.colsurfb.2019.01.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 11/29/2018] [Accepted: 01/05/2019] [Indexed: 10/27/2022]
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The interaction of antimicrobial peptides with membranes. Adv Colloid Interface Sci 2017; 247:521-532. [PMID: 28606715 DOI: 10.1016/j.cis.2017.06.001] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/30/2017] [Accepted: 06/03/2017] [Indexed: 11/22/2022]
Abstract
The interaction of antimicrobial peptides (AMPs) with biological membranes is in the focus of research since several years, and the most important features and modes of action of AMPs are described in this review. Different model systems can be used to understand such interactions on a molecular level. As a special example, we use 2D and 3D model membranes to investigate the interaction of the natural cyclic (Ar-1) and the synthetic linear molecule arenicin with selected amphiphiles and phospholipids. A panoply of sophisticated methods has been used to analyze these interactions on a molecular level. As a general trend, one observes that cationic antimicrobial peptides do not interact with cationic amphiphiles due to electrostatic repulsion, whereas with non-ionic amphiphiles, the peptide interacts only with aggregated systems and not with monomers. The interaction is weak (hydrophobic interaction) and requires an aggregated state with a large surface (cylindrical micelles). Anionic amphiphiles (as monomers or micelles) exhibit strong electrostatic interactions with the AMPs leading to changes in the peptide conformation. Both types of peptides interact strongly with anionic phospholipid monolayers with a preference for fluid layers. The interaction with a zwitterionic layer is almost absent for the linear derivative but measurable for the cyclic arenicin Ar-1. This is in accordance with biological experiments showing that Ar-1 forms well defined stable pores in phospholipid and lipopolysaccharide (LPS) membranes (cytotoxicity). The synthetic linear arenicin, which is less cytotoxic, does not affect the mammalian lipids to such an extent. The interaction of arenicin with bacterial membrane lipids is dominated by hydrogen bonding together with electrostatic and hydrophobic interactions.
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Schöne AC, Roch T, Schulz B, Lendlein A. Evaluating polymeric biomaterial-environment interfaces by Langmuir monolayer techniques. J R Soc Interface 2017; 14:20161028. [PMID: 28468918 PMCID: PMC5454283 DOI: 10.1098/rsif.2016.1028] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/05/2017] [Indexed: 12/18/2022] Open
Abstract
Polymeric biomaterials are of specific relevance in medical and pharmaceutical applications due to their wide range of tailorable properties and functionalities. The knowledge about interactions of biomaterials with their biological environment is of crucial importance for developing highly sophisticated medical devices. To achieve optimal in vivo performance, a description at the molecular level is required to gain better understanding about the surface of synthetic materials for tailoring their properties. This is still challenging and requires the comprehensive characterization of morphological structures, polymer chain arrangements and degradation behaviour. The review discusses selected aspects for evaluating polymeric biomaterial-environment interfaces by Langmuir monolayer methods as powerful techniques for studying interfacial properties, such as morphological and degradation processes. The combination of spectroscopic, microscopic and scattering methods with the Langmuir techniques adapted to polymers can substantially improve the understanding of their in vivo behaviour.
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Affiliation(s)
- Anne-Christin Schöne
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
| | - Toralf Roch
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
- Helmholtz Virtual Institute-Multifunctional Biomaterials for Medicine, Kantstrasse 55, 14513 Teltow, Germany
| | - Burkhard Schulz
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
| | - Andreas Lendlein
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
- Helmholtz Virtual Institute-Multifunctional Biomaterials for Medicine, Kantstrasse 55, 14513 Teltow, Germany
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Ariza-Carmona L, Martín-Romero MT, Giner-Casares JJ, Camacho L. Direct observation by using Brewster angle microscopy of the diacetylene polimerization in mixed Langmuir film. J Colloid Interface Sci 2015; 459:53-62. [PMID: 26263495 DOI: 10.1016/j.jcis.2015.08.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 07/27/2015] [Accepted: 08/03/2015] [Indexed: 11/18/2022]
Abstract
Mixed Langmuir monolayers of 10,12-Pentacosadiynoic acid (DA) and amphiphilic hemicyanine (HSP) have been fabricated at the air-water interface. The mixed monolayer has been proved to be completely homogeneous. The DA molecules are arranged in a single monolayer within the mixed Langmuir monolayer, as opposed to the typical trilayer architecture for the pure DA film. Brewster angle microscopy has been used to reveal the mesoscopic structure of the mixed Langmuir monolayer. Flower shape domains with internal anisotropy due the ordered alignment of hemicyanine groups have been observed. Given the absorption features of the hemicyanine groups at the wavelength used in the BAM experiments, the enhancement of reflection provoked by the absorption process leads to the observed anisotropy. The ordering of such groups is promoted by their strong self-aggregation tendency. Under UV irradiation at the air-water interface, polydiacetylene (PDA) has been fabricated. In spite a significant increase in the domains reflectivity has been observed owing to the modification in the mentioned enhanced reflection, the texture of the domains remains equal. The PDA polymer chain therefore grows in the same direction in which the HSP molecules are aligned. This study is expected to enrich the understanding and design of fabrication of PDA at interfaces.
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Affiliation(s)
- Luisa Ariza-Carmona
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba E-14014, Spain
| | - María T Martín-Romero
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba E-14014, Spain
| | - Juan J Giner-Casares
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba E-14014, Spain; Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia - San Sebastián, Spain.
| | - Luis Camacho
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba E-14014, Spain.
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Stefaniu C, Brezesinski G. X-ray investigation of monolayers formed at the soft air/water interface. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.01.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Travkova OG, Andrä J, Möhwald H, Brezesinski G. Influence of arenicin on phase transitions and ordering of lipids in 2D model membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12203-12211. [PMID: 24050708 DOI: 10.1021/la402340d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Antimicrobial peptides (AMPs) are important effector molecules of the innate immune system of all species. AMPs are highly selective and can be used as lead structures for the development of new drugs complementing standard antibiotic therapies. Understanding the crucial parameters of peptide-membrane interactions is necessary for elucidation of the molecular mechanisms of action. Phospholipid monolayers, as simple 2D models of the membrane surface, can be effectively used for studies of peptide-membrane interactions. The present study is focused on the recently discovered peptide arenicin-1 (Ar-1), which possesses antibacterial and antifungal activities. A linear derivative with serine residues instead of cysteines (C/S-Ar-1) was additionally used to investigate the influence of the AMP on the phase behavior of lipid monolayers at the air/liquid interface. Using the Langmuir balance technique and IRRAS allows us to conclude that both original and modified arenicins reveal a strong influence on the phase transition of anionic phospholipids (fluidization of the lipid hydrocarbon chains), whereas the thermodynamic properties of the zwitterionic phospholipid layers are not affected. A strong effect of the modified peptide on the ordering of negatively charged phospholipids at the air-water interface compared to zwitterionic phospholipids has been observed using GIXD measurements, supported by IRRAS simulations for the spectral range corresponding to the lipid hydrocarbon chains. At lateral pressures above 30 mN/m, both peptides are squeezed out from zwitterionic lipid monolayers, but remains attached to and partly incorporated in anionic lipid monolayers. This study points at the importance of the interplay between hydrophobic and electrostatic interactions for the membrane disruption by AMPs.
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Affiliation(s)
- Oksana G Travkova
- Max Planck Institute of Colloids and Interfaces , Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany
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Blume A, Kerth A. Peptide and protein binding to lipid monolayers studied by FT-IRRA spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:2294-305. [PMID: 23816442 DOI: 10.1016/j.bbamem.2013.04.014] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Accepted: 04/12/2013] [Indexed: 12/30/2022]
Abstract
Lipid monolayers at the air-water interface represent half of a lipid bilayer and are therefore suitable model systems for studying the binding of peripheral proteins and polypeptides as well as proteins containing hydrophobic membrane anchors to membrane interfaces. Infrared reflection-absorption spectroscopy (IRRAS) of these monolayer films at the air-water interface provides information on the state of the lipid monolayers as well as on the conformational and orientational order of the film constituents. We will review shortly the experimental set-up and the possibilities for obtaining structural information before several applications of the method to lipid-protein monolayers will be described. We will focus on examples where the analysis of the protein and peptide bands for pure monolayers of these compounds are combined with experiments where the same compounds are bound to lipid monolayers. Combination of these experiments leads to detailed information about the conformational properties and the orientation of the molecules at the air-water interface in contrast to being bound to the lipid-water interface. This article is part of a Special Issue entitled: FTIR in membrane proteins and peptide studies.
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Affiliation(s)
- Alfred Blume
- Institute of Chemistry, Martin-Luther-University Halle-Wittenberg, von-Danckelmann-Platz 4, D-06120, Halle Saale, Germany.
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Dannehl C, Gutsmann T, Brezesinski G. Surface activity and structures of two fragments of the human antimicrobial LL-37. Colloids Surf B Biointerfaces 2013; 109:129-35. [PMID: 23624281 DOI: 10.1016/j.colsurfb.2013.03.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 03/22/2013] [Accepted: 03/25/2013] [Indexed: 10/27/2022]
Abstract
Two fragments of the antimicrobial peptide LL-37 (LL-32 and LL-20) have been characterized in adsorption layers at the air/buffer interface by infrared reflection absorption spectroscopy (IRRAS) and X-ray reflectivity (XR) measurements. As shown in previous work, LL-32 exhibits an increased antimicrobial activity compared to LL-37, while LL-20 is almost not active. It is shown in this work that the peptides differ drastically in their surface activity (equilibrium adsorption pressure) and their secondary structure, when they are adsorbed to the air/buffer interface. As concluded from the CD spectra, both peptides are unstructured in bulk. That means that the adsorption of the peptides to the air/buffer interface is connected to a secondary structure change. While LL-32 transforms into an α-helix lying flat at the buffer surface, with a helix diameter of 17Å, LL-20 adopts a partly unstructured conformation. The dichroic ratio of LL-20 is reduced and the electron density profile shows the formation of a second layer. The ability of LL-32 to form a complete α-helical structure at the interface is in good agreement with its higher antimicrobial activity.
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Affiliation(s)
- Claudia Dannehl
- Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
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Interplay of mycolic acids, antimycobacterial compounds and pulmonary surfactant membrane: A biophysical approach to disease. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:896-905. [DOI: 10.1016/j.bbamem.2012.09.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 09/14/2012] [Accepted: 09/19/2012] [Indexed: 11/17/2022]
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Travkova OG, Brezesinski G. Adsorption of the antimicrobial peptide arenicin and its linear derivative to model membranes – A maximum insertion pressure study. Chem Phys Lipids 2013; 167-168:43-50. [DOI: 10.1016/j.chemphyslip.2013.01.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/26/2013] [Indexed: 11/25/2022]
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Hoernke M, Falenski JA, Schwieger C, Koksch B, Brezesinski G. Triggers for β-sheet formation at the hydrophobic-hydrophilic interface: high concentration, in-plane orientational order, and metal ion complexation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:14218-14231. [PMID: 22011020 DOI: 10.1021/la203016z] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Amyloid formation plays a causative role in neurodegenerative diseases such as Alzheimer's disease or Parkinson's disease. Soluble peptides form β-sheets that subsequently rearrange into fibrils and deposit as amyloid plaques. Many parameters trigger and influence the onset of the β-sheet formation. Early stages are recently discussed to be cell-toxic. Aiming at understanding various triggers such as interactions with hydrophobic-hydrophilic interfaces and metal ion complexation and their interplay, we investigated a set of model peptides at the air-water interface. We are using a general approach to a variety of diseases such as Alzheimer's disease, Parkinson's disease, and type II diabetes that are connected to amyloid formation. Surface sensitive techniques combined with film balance measurements have been used to assess the conformation of the peptides and their orientation at the air-water interface (IR reflection-absorption spectroscopy). Additionally, the structures of the peptide layers were characterized by grazing incidence X-ray diffraction and X-ray reflectivity. The peptides adsorb to the air-water interface and immediately adopt an α-helical conformation. This helical intermediate transforms into β-sheets upon further triggering. The factors that result in β-sheet formation are dependent on the peptide sequence. In general, the interface has the strongest effect on peptide conformation compared to high concentrations or metal ions. Metal ions are able to prevent aggregation in bulk but not at the interface. At the interface, metal ion complexation has only minor effects on the peptide secondary structure, influencing the in-plane structure that is formed in two dimensions. At the air-water interface, increased concentrations or a parallel arrangement of the α-helical intermediates are the most effective triggers. This study reveals the role of various triggers for β-sheet formation and their complex interplay. Our main finding is that the hydrophobic-hydrophilic interface largely governs the conformation of peptides. Therefore, the present study implies that special care is needed when interpreting data that may be affected by different amounts or types of interfaces during experimentation.
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Affiliation(s)
- Maria Hoernke
- Department of Interfaces, Max-Planck-Institute of Colloids and Interfaces, Potsdam, Germany
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