1
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Lee TH, Charchar P, Separovic F, Reid GE, Yarovsky I, Aguilar MI. The intricate link between membrane lipid structure and composition and membrane structural properties in bacterial membranes. Chem Sci 2024; 15:3408-3427. [PMID: 38455013 PMCID: PMC10915831 DOI: 10.1039/d3sc04523d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Accepted: 01/26/2024] [Indexed: 03/09/2024] Open
Abstract
It is now evident that the cell manipulates lipid composition to regulate different processes such as membrane protein insertion, assembly and function. Moreover, changes in membrane structure and properties, lipid homeostasis during growth and differentiation with associated changes in cell size and shape, and responses to external stress have been related to drug resistance across mammalian species and a range of microorganisms. While it is well known that the biomembrane is a fluid self-assembled nanostructure, the link between the lipid components and the structural properties of the lipid bilayer are not well understood. This perspective aims to address this topic with a view to a more detailed understanding of the factors that regulate bilayer structure and flexibility. We describe a selection of recent studies that address the dynamic nature of bacterial lipid diversity and membrane properties in response to stress conditions. This emerging area has important implications for a broad range of cellular processes and may open new avenues of drug design for selective cell targeting.
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Affiliation(s)
- Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University Clayton VIC 3800 Australia
| | - Patrick Charchar
- School of Engineering, RMIT University Melbourne Victoria 3001 Australia
| | - Frances Separovic
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne VIC 3010 Australia
| | - Gavin E Reid
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne VIC 3010 Australia
- Department of Biochemistry and Pharmacology, University of Melbourne Parkville VIC 3010 Australia
| | - Irene Yarovsky
- School of Engineering, RMIT University Melbourne Victoria 3001 Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University Clayton VIC 3800 Australia
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2
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Hu X, Liao M, Shen K, Ding K, Campana M, van der Kamp S, McInnes EF, Padia F, Lu JR. Unraveling How Membrane Nanostructure Changes Impact the Eye Irritation of Nonionic Alkyl Ethoxylate Surfactants. ACS APPLIED MATERIALS & INTERFACES 2023; 15:59087-59098. [PMID: 38078441 PMCID: PMC10739585 DOI: 10.1021/acsami.3c14794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 12/22/2023]
Abstract
Nonionic surfactants used in agri-spraying processes may cause varying degrees of corneal irritation when they come in direct contact with farmers' eyes, and the exact irritations are thought to be determined by how surfactants interact with corneal cell membranes. However, how nonionic surfactants interact with cell membranes at the molecular and nano levels remains largely unexplored. In this study, the interactions between nonionic surfactants (alkyl ethoxylate, C12Em) and lipid membranes were examined by membrane permeability measurement, quartz crystal microbalance with dissipation, dual polarization interferometry, confocal laser scanning microscopy, and neutron reflection, aiming to reveal complementary structural features at the molecular and nano levels. Apart from the extremely hydrophobic surfactant C12E2, all nonionic surfactants studied could penetrate the model cell membrane composed of a phosphocholine lipid bilayer. Nonionic surfactants with intermediate amphiphilicity (C12E6) rapidly fused into the lipid membrane and stimulated the formation of pores across the lipid bilayer, consistent with the cytoplasm leakage and fast cell necrosis observed from the cytotoxicity study of corneal cells. In comparison, while hydrophobic and hydrophilic surfactants [those with long and short ethoxylates (C12E4,12,23)] could cause mild structural alteration to the outer lipid layer of the membrane, these structural changes were insufficient to elicit large cytoplasmic leakage rapidly and instead cell death occurred over longer periods of time due to changes in the membrane permeability. These results reveal the strong link of surfactant-lipid membrane interactions to surfactant cytotoxicity and the association with amphiphilicity of nonionic surfactants.
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Affiliation(s)
- Xuzhi Hu
- Biological
Physics Group, Department of Physics and Astronomy, School of Natural
Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Mingrui Liao
- Biological
Physics Group, Department of Physics and Astronomy, School of Natural
Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Kangcheng Shen
- Biological
Physics Group, Department of Physics and Astronomy, School of Natural
Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Ke Ding
- Biological
Physics Group, Department of Physics and Astronomy, School of Natural
Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Mario Campana
- Rutherford
Appleton Laboratory, STFC ISIS Facility, Didcot OX11 0QX, U.K.
| | - Sophie van der Kamp
- Jealott’s
Hill International Research Centre, Syngenta, Bracknell, Berkshire RG42
6EY, U.K.
| | - Elizabeth F. McInnes
- Jealott’s
Hill International Research Centre, Syngenta, Bracknell, Berkshire RG42
6EY, U.K.
| | - Faheem Padia
- Jealott’s
Hill International Research Centre, Syngenta, Bracknell, Berkshire RG42
6EY, U.K.
| | - Jian R. Lu
- Biological
Physics Group, Department of Physics and Astronomy, School of Natural
Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
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3
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Wang C, Ma YH, Han X, Lu X. Re-Examining Interaction between Antimicrobial Peptide Aurein 1.2 and Model Cell Membranes via SFG. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:690-699. [PMID: 36576332 DOI: 10.1021/acs.langmuir.2c03068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Aurein 1.2 (Aur), a highly efficient 13-residue antimicrobial peptide (AMP) with a broad-spectrum antibiotic activity originally derived from the Australian frog skin secretions, can nonspecifically disrupt bacterial membranes. To deeply understand the molecular-level detail of the antimicrobial mechanism, here, we artificially established comparative experimental models to investigate the interfacial interaction process between Aur and negatively charged model cell membranes via sum frequency generation vibrational spectroscopy. Sequencing the vibrational signals of phenyl, C-H, and amide groups from Aur has characteristically helped us differentiate between the initial adsorption and subsequent insertion steps upon mutual interaction between Aur and the charged lipids. The phenyl group at the terminal phenylalanine residue can act as an anchor in the adsorption process. The time-dependent signal intensity of α-helices showed a sharp rise once the Aur molecules came into contact with the negatively charged lipids, indicating that the adsorption process was ongoing. Insertion of Aur into the charged lipids then offered the detectable interfacial C-H signals from Aur. The achiral and chiral amide I signals suggest that Aur had formed β-folding-like aggregates after interacting with the charged lipids, along with the subsequent descending α-helical amide I signals. The above-mentioned experimental results provide the molecular-level detail on how the Aur molecules interact with the cell membranes, and such a mechanism study can offer the necessary support for the AMP design and later application.
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Affiliation(s)
- Chu Wang
- State Key Laboratory of Bioelectronics, School of Biomedical Engineering, Southeast University, Nanjing 210096, China
| | - Yong-Hao Ma
- State Key Laboratory of Bioelectronics, School of Biomedical Engineering, Southeast University, Nanjing 210096, China
| | - Xiaofeng Han
- State Key Laboratory of Bioelectronics, School of Biomedical Engineering, Southeast University, Nanjing 210096, China
| | - Xiaolin Lu
- State Key Laboratory of Bioelectronics, School of Biomedical Engineering, Southeast University, Nanjing 210096, China
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4
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Qian S, Zolnierczuk PA. Interaction of a Short Antimicrobial Peptide on Charged Lipid Bilayer: A Case Study on Aurein 1.2 Peptide. BBA ADVANCES 2022; 2:100045. [PMID: 37082600 PMCID: PMC10074906 DOI: 10.1016/j.bbadva.2022.100045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 01/21/2022] [Accepted: 02/01/2022] [Indexed: 12/27/2022] Open
Abstract
Aurein 1.2 (aurein) is a short but active α-helical antimicrobial peptide discovered in Australian tree frogs (Litoria aurea). It shows inhibition on a broad spectrum of bacteria and cancer cells. With well-defined helicity, amphipathicity, and cationic charges, it readily binds to membranes and causes membrane change and disruption. This study provides details on how aurein interacts with charged lipid membranes by using neutron membrane diffraction (NMD) and neutron spin echo (NSE) spectroscopy on complex peptide-membrane systems. NMD provides higher resolution lipid bilayer structures than solution scattering. NMD revealed the peptide is mostly associated in the lipid headgroup region. Even at moderately high concentrations (e.g., peptide:lipid ratio of 1:30), aurein is located at the acyl chain-headgroup region without deep penetration into the hydrophobic acyl chain. However, it does reduce the elasticity of the membrane at that concentration, which was corroborated by the NSE results. Furthermore, NSE shows that aurein first softens the membrane, like many other α-helical peptides at low concentration, but then makes the membrane much more rigid, even without membrane pore formation. Combining our previous studies, the evidence shows that aurein at relatively low concentrations still modifies lipid distribution significantly and can cause membrane thinning and lateral segregation of charged lipids. At the same time, the membrane's mechanical properties are modified with much slower lipid diffusion. This suggests that aurein can attack the microbial membrane without the need to form membrane pores or disintegrate membranes; instead, it promotes the formation of domains at low concentration.
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Affiliation(s)
- Shuo Qian
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States
- Second Target Station, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States
- Corresponding author.
| | - Piotr A. Zolnierczuk
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States
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5
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Folentarska A, Łagiewka J, Krystyjan M, Ciesielski W. Biodegradable Binary and Ternary Complexes from Renewable Raw Materials. Polymers (Basel) 2021; 13:polym13172925. [PMID: 34502965 PMCID: PMC8433750 DOI: 10.3390/polym13172925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/26/2021] [Accepted: 08/26/2021] [Indexed: 02/06/2023] Open
Abstract
The aim of this paper is to investigate the interactions between polysaccharides with different electrical charges (anionic and neutral starches) and proteins and fats in food ingredients. Another objective is to understand the mechanisms of these systems and the interdependence between their properties and intermolecular interactions. At present, there are not many studies on ternary blends composed of natural food polymers: polysaccharides of different electrical charge (anionic and neutral starches), proteins and lipids. Additionally, there are no reports concerning what type of interactions between polysaccharide, proteins and lipids exist simultaneously when the components are mixed in different orders. This paper intends to fill this gap. It also presents the application of natural biopolymers in the food and non-food industries.
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Affiliation(s)
- Agnieszka Folentarska
- Faculty of Exact, Natural and Technical Sciences, Jan Dlugosz University in Czestochowa, 13/15 Armii Krajowej Ave., 42-200 Czestochowa, Poland; (A.F.); (J.Ł.)
| | - Jakub Łagiewka
- Faculty of Exact, Natural and Technical Sciences, Jan Dlugosz University in Czestochowa, 13/15 Armii Krajowej Ave., 42-200 Czestochowa, Poland; (A.F.); (J.Ł.)
| | - Magdalena Krystyjan
- Faculty of Food Technology, University of Agriculture in Krakow, 122 Balicka Street, 30-149 Krakow, Poland;
| | - Wojciech Ciesielski
- Faculty of Exact, Natural and Technical Sciences, Jan Dlugosz University in Czestochowa, 13/15 Armii Krajowej Ave., 42-200 Czestochowa, Poland; (A.F.); (J.Ł.)
- Correspondence: or
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6
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Lee TH, Hofferek V, Sani MA, Separovic F, Reid GE, Aguilar MI. The impact of antibacterial peptides on bacterial lipid membranes depends on stage of growth. Faraday Discuss 2021; 232:399-418. [DOI: 10.1039/d0fd00052c] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Impact of maculatin 1.1 on supported lipid bilayers (SLBs) derived from early growth phase (EGP) or stationary growth phase (SGP) E. coli lipid extracts, monitored by atomic force microscopy which images bilayer morphology in real time.
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Affiliation(s)
- Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
| | - Vinzenz Hofferek
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, VIC 3010, Australia
| | - Marc-Antoine Sani
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, VIC 3010, Australia
| | - Frances Separovic
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, VIC 3010, Australia
| | - Gavin E. Reid
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, VIC 3010, Australia
- Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
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7
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Nielsen JE, Prévost SF, Jenssen H, Lund R. Impact of antimicrobial peptides on E. coli-mimicking lipid model membranes: correlating structural and dynamic effects using scattering methods. Faraday Discuss 2021; 232:203-217. [DOI: 10.1039/d0fd00046a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using X-rays and neutrons we address the effect of AMPs on structure and dynamics of lipids in bacterial model membranes.
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Affiliation(s)
| | | | - Håvard Jenssen
- Department of Science and Environment, Roskilde University, 4000 Roskilde, Denmark
| | - Reidar Lund
- Department of Chemistry, University of Oslo, 0315 Oslo, Norway
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8
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Hammond K, Ryadnov MG, Hoogenboom BW. Atomic force microscopy to elucidate how peptides disrupt membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1863:183447. [PMID: 32835656 DOI: 10.1016/j.bbamem.2020.183447] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/30/2020] [Accepted: 08/13/2020] [Indexed: 12/24/2022]
Abstract
Atomic force microscopy is an increasingly attractive tool to study how peptides disrupt membranes. Often performed on reconstituted lipid bilayers, it provides access to time and length scales that allow dynamic investigations with nanometre resolution. Over the last decade, AFM studies have enabled visualisation of membrane disruption mechanisms by antimicrobial or host defence peptides, including peptides that target malignant cells and biofilms. Moreover, the emergence of high-speed modalities of the technique broadens the scope of investigations to antimicrobial kinetics as well as the imaging of peptide action on live cells in real time. This review describes how methodological advances in AFM facilitate new insights into membrane disruption mechanisms.
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Affiliation(s)
- Katharine Hammond
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK; London Centre for Nanotechnology, University College London, London WC1H 0AH, UK; Department of Physics & Astronomy, University College London, London WC1E 6BT, UK.
| | - Maxim G Ryadnov
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK; Department of Physics, King's College London, Strand Lane, London WC2R 2LS, UK.
| | - Bart W Hoogenboom
- London Centre for Nanotechnology, University College London, London WC1H 0AH, UK; Department of Physics & Astronomy, University College London, London WC1E 6BT, UK.
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9
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Xue Y, Wang Y, Wang S, Yan M, Huang J, Yang X. Label-Free and Regenerable Aptasensor for Real-Time Detection of Cadmium(II) by Dual Polarization Interferometry. Anal Chem 2020; 92:10007-10015. [PMID: 32618180 DOI: 10.1021/acs.analchem.0c01710] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recently, numerous aptamer-based biosensors have been developed to detect heavy metal ions. Most of aptamer-based biosensors only can be used to get some quantitative information. The mechanism of the interaction between aptamer and metal ions, however, is rarely studied. In this work, a label-free and regenerable aptamer-based biosensor was constructed using dual polarization interferometry (DPI). This aptasensor was used to investigate the real-time interaction process between cadmium(II) and its aptamer. According to the information on mass, thickness, and density obtained by DPI, a Cd2+ concentration-dependent interaction mechanism and conformation of aptamer was proposed. At low Cd2+ concentration, Cd2+ mainly interacted with phosphate groups on aptamer, resulting in the stretched ssDNA and a few vertical hairpin structures. When adding the high concentration of Cd2+, Cd2+ primarily bound with bases of DNA by coordination interaction and the conformation of aptamer transferred to a tight and short hairpin structure. In addition, the association rate constant (ka), dissociation rate constant (kd) and disassociation constant (KD) between Cd2+ and its aptamer were calculated to be 96 M-1 S-1, 2.11 × 10-5 S-1, and 220 nM, respectively. The proposed aptasensor showed high sensitivity for Cd2+ detection with the detection limit of 0.61 μg/L, which was far below the 5.0 μg/L ranked by the U.S. Environmental Protection Agency. The biosensor also exhibited excellent regenerability and could be used for three cycles without obvious change in response signal. Therefore, the developed method could not only provide quantitative information, but also offered the information on conformation and kinetics for molecular interaction. This method can facilely extend to study the interaction of DNA with other ions, small molecules, or biomacromolecules.
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Affiliation(s)
- Yu Xue
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin 130022, China.,University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yu Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin 130022, China.,University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shuang Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin 130022, China.,University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Mengxia Yan
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin 130022, China.,University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jianshe Huang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin 130022, China
| | - Xiurong Yang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin 130022, China.,University of Science and Technology of China, Hefei, Anhui 230026, China
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10
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Lee TH, Hall K, Aguilar MI. The Effect of Charge on Melittin-Induced Changes in Membrane Structure and Morphology. Aust J Chem 2020. [DOI: 10.1071/ch19500] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The binding of melittin to a range of phospholipid bilayers was studied using dual polarisation interferometry and atomic force microscopy. The phospholipid model membranes included zwitterionic dimyristylphosphatidylcholine (DMPC), together with mixtures of DMPC/dimyristylphosphatidylglycerol (DMPG) and DMPC/DMPG/cholesterol. Melittin caused significant disruption on all bilayers, but differences in morphological changes during binding were different on each membrane. Overall, the results demonstrate that the process of membrane disruption follows distinct structural changes for different lipid mixtures irrespective of the strength of binding to the membrane surface.
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11
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Pandidan S, Mechler A. Nano-viscosimetry analysis of the membrane disrupting action of the bee venom peptide melittin. Sci Rep 2019; 9:10841. [PMID: 31346251 PMCID: PMC6658469 DOI: 10.1038/s41598-019-47325-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 07/10/2019] [Indexed: 12/30/2022] Open
Abstract
Melittin is one of the most studied α-helical cationic membrane disrupting peptides. It is the main component of bee venom, however it is considered an antimicrobial peptide for its ability to kill bacteria. Melittin is believed to act by opening large toroidal pores in the plasma membrane of the targeted cells/bacteria, although this is questioned by some authors. Little is known, however, about the molecular mechanism leading to this activity. In this study the mechanism of action of melittin was studied by dye leakage and quartz crystal microbalance fingerprinting analysis in biomimetic model membranes. The results revealed the existence of multiple stages in the membrane disrupting action with characteristic differences between different membrane types. In bacterial-mimetic (charged) lipid mixtures the viscoelastic fingerprints suggest a surface-acting mechanism, whereas in mammalian-mimetic (neutral) membranes melittin appears to penetrate the bilayer already at low concentrations. In domain-forming mixed membranes melittin shows a preference for the domain containing predominantly zwitterionic lipids. The results confirm membrane poration but are inconsistent with the insertion-to-toroidal pore pathway. Therefore hypotheses of the two membrane disrupting pathways were developed, describing the membrane disruption as either surface tension modulation leading to toroidal pore formation, or linear aggregation leading to fissure formation in the membrane.
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Affiliation(s)
- Sara Pandidan
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Australia
| | - Adam Mechler
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Australia.
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12
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Sharma VK, Qian S. Effect of an Antimicrobial Peptide on Lateral Segregation of Lipids: A Structure and Dynamics Study by Neutron Scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4152-4160. [PMID: 30720281 DOI: 10.1021/acs.langmuir.8b04158] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Antimicrobial peptides are one of the most promising classes of antibiotic agents for drug-resistant bacteria. Although the mechanisms of their action are not fully understood, many of them are found to interact with the target bacterial membrane, causing different degrees of perturbations. In this work, we directly observed that a short peptide disturbs membranes by inducing lateral segregation of lipids without forming pores or destroying membranes. Aurein 1.2 (aurein) is a 13-amino acid antimicrobial peptide discovered in the frog Litoria genus that exhibits high antibiotic efficacy. Being cationic and amphiphilic, it binds spontaneously to a membrane surface with or without charged lipids. With a small-angle neutron scattering contrast matching technique that is sensitive to lateral heterogeneity in membrane, we found that aurein induces significant lateral segregation in an initially uniform lipid bilayer composed of zwitterionic lipid and anionic lipid. More intriguingly, the lateral segregation was similar to the domain formed below the order-disorder phase-transition temperature. To our knowledge, this is the first direct observation of lateral segregation caused by a peptide. With quasi-elastic neutron scattering, we indeed found that the lipid lateral motion in the fluid phase was reduced even at low aurein concentrations. The reduced lateral mobility makes the membrane prone to additional stresses and defects that change membrane properties and impede membrane-related biological processes. Our results provide insights into how a short peptide kills bacteria at low concentrations without forming pores or destroying membranes. With a better understanding of the interaction, more effective and economically antimicrobial peptides may be designed.
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Affiliation(s)
- Veerendra K Sharma
- Solid State Physics Division , Bhabha Atomic Research Centre , Mumbai 400085 , India
| | - Shuo Qian
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37830 , United States
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13
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Poger D, Pöyry S, Mark AE. Could Cardiolipin Protect Membranes against the Action of Certain Antimicrobial Peptides? Aurein 1.2, a Case Study. ACS OMEGA 2018; 3:16453-16464. [PMID: 30613806 PMCID: PMC6312644 DOI: 10.1021/acsomega.8b02710] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 11/20/2018] [Indexed: 06/09/2023]
Abstract
The activity of a host of antimicrobial peptides has been examined against a range of lipid bilayers mimicking bacterial and eukaryotic membranes. Despite this, the molecular mechanisms and the nature of the physicochemical properties underlying the peptide-lipid interactions that lead to membrane disruption are yet to be fully elucidated. In this study, the interaction of the short antimicrobial peptide aurein 1.2 was examined in the presence of an anionic cardiolipin-containing lipid bilayer using molecular dynamics simulations. Aurein 1.2 is known to interact strongly with anionic lipid membranes. In the simulations, the binding of aurein 1.2 was associated with buckling of the lipid bilayer, the degree of which varied with the peptide concentration. The simulations suggest that the intrinsic properties of cardiolipin, especially the fact that it promotes negative membrane curvature, may help protect membranes against the action of peptides such as aurein 1.2 by counteracting the tendency of the peptide to induce positive curvature in target membranes.
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Affiliation(s)
- David Poger
- School
of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Sanja Pöyry
- Department
of Physics, Tampere University of Technology, POB 692, F1-33720 Tampere, Finland
| | - Alan E. Mark
- School
of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
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14
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Interaction of green silver nanoparticles with model membranes: possible role in the antibacterial activity. Colloids Surf B Biointerfaces 2018; 171:320-326. [DOI: 10.1016/j.colsurfb.2018.07.044] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 06/29/2018] [Accepted: 07/20/2018] [Indexed: 11/18/2022]
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15
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Lee TH, Hirst DJ, Kulkarni K, Del Borgo MP, Aguilar MI. Exploring Molecular-Biomembrane Interactions with Surface Plasmon Resonance and Dual Polarization Interferometry Technology: Expanding the Spotlight onto Biomembrane Structure. Chem Rev 2018; 118:5392-5487. [PMID: 29793341 DOI: 10.1021/acs.chemrev.7b00729] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The molecular analysis of biomolecular-membrane interactions is central to understanding most cellular systems but has emerged as a complex technical challenge given the complexities of membrane structure and composition across all living cells. We present a review of the application of surface plasmon resonance and dual polarization interferometry-based biosensors to the study of biomembrane-based systems using both planar mono- or bilayers or liposomes. We first describe the optical principals and instrumentation of surface plasmon resonance, including both linear and extraordinary transmission modes and dual polarization interferometry. We then describe the wide range of model membrane systems that have been developed for deposition on the chips surfaces that include planar, polymer cushioned, tethered bilayers, and liposomes. This is followed by a description of the different chemical immobilization or physisorption techniques. The application of this broad range of engineered membrane surfaces to biomolecular-membrane interactions is then overviewed and how the information obtained using these techniques enhance our molecular understanding of membrane-mediated peptide and protein function. We first discuss experiments where SPR alone has been used to characterize membrane binding and describe how these studies yielded novel insight into the molecular events associated with membrane interactions and how they provided a significant impetus to more recent studies that focus on coincident membrane structure changes during binding of peptides and proteins. We then discuss the emerging limitations of not monitoring the effects on membrane structure and how SPR data can be combined with DPI to provide significant new information on how a membrane responds to the binding of peptides and proteins.
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Affiliation(s)
- Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Daniel J Hirst
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Ketav Kulkarni
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Mark P Del Borgo
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
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16
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Design and synthesis of cell selective α/β-diastereomeric peptidomimetic with potent in vivo antibacterial activity against methicillin resistant S. Aureus. Bioorg Chem 2018; 76:538-547. [DOI: 10.1016/j.bioorg.2017.12.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 12/13/2017] [Accepted: 12/15/2017] [Indexed: 01/24/2023]
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17
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Lee TH, Sani MA, Overall S, Separovic F, Aguilar MI. Effect of phosphatidylcholine bilayer thickness and molecular order on the binding of the antimicrobial peptide maculatin 1.1. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:300-309. [DOI: 10.1016/j.bbamem.2017.10.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 09/18/2017] [Accepted: 10/08/2017] [Indexed: 01/01/2023]
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18
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Phenylalanine residues act as membrane anchors in the antimicrobial action of Aurein 1.2. Biointerphases 2017; 12:05G605. [PMID: 29078702 DOI: 10.1116/1.4995674] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Aurein 1.2 is a small cationic antimicrobial peptide, one of the shortest peptides that can exert antimicrobial activity at low micromolar concentrations. Aurein 1.2 is a surface acting peptide, following the "carpet" mechanism of thresholded membrane disruption. It is generally assumed that the activity of such cationic α-helical membrane disrupting peptides is charge driven. Here, the authors show that instead of charge interactions, aromatic phenylalanine residues of the Aurein 1.2 sequence facilitate the membrane binding. The activity of the wild type peptide was compared to mutants in which the Phe residues were substituted, singly and in tandem, with alanine. Measurements by quartz crystal microbalance, impedance spectroscopy, and dye leakage experiments demonstrated that single residue mutants retain a much-reduced activity whereas the deletion of both Phe residues prevents membrane disruption entirely. The single residue mutants exhibited an altered mechanism of action, permeabilizing but not dissolving the target membranes. These results offer a new design rule for membrane disrupting peptides with potential pharmacological applications.
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19
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20
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Abstract
Aurein 1.2 is a potent antimicrobial peptide secreted by frog Litoria aurea. As a short membrane-active peptide with only 13 amino acids in sequence, it has been found to be residing on the surface of lipid bilayer and permeabilizing bacterial membranes at high concentration. However, the detail at the molecular level is largely unknown. In this study, we investigated the action of Aurein 1.2 in charged lipid bilayers composed of DMPC/DMPG. Oriented Circular Dichroism results showed that the peptide was on the surface of lipid bilayer regardless of the charged lipid ratio. Only at a very high peptide-to-lipid ratio (~1/10), the peptide became perpendicular to the bilayer, however no pore was detected by neutron in-plane scattering. To further understand how it interacted with charged lipid bilayers, we employed Small Angle Neutron Scattering to probe lipid distribution across bilayer leaflets in lipid vesicles. The results showed that Aurein 1.2 interacted strongly with negatively charged DMPG, causing strong asymmetry in lipid bilayer. At high concentration, while the vesicles were intact, we found additional structure feature on the bilayer. Our study provides a glimpse into how Aurein 1.2 disturbs anionic lipid-containing membranes without pore formation.
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21
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Dekan Z, Headey SJ, Scanlon M, Baldo BA, Lee T, Aguilar M, Deuis JR, Vetter I, Elliott AG, Amado M, Cooper MA, Alewood D, Alewood PF. Δ‐Myrtoxin‐Mp1a is a Helical Heterodimer from the Venom of the Jack Jumper Ant that has Antimicrobial, Membrane‐Disrupting, and Nociceptive Activities. Angew Chem Int Ed Engl 2017; 56:8495-8499. [DOI: 10.1002/anie.201703360] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Zoltan Dekan
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Stephen J. Headey
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences Monash University 381 Royal Parade Parkville VIC 3052 Australia
| | - Martin Scanlon
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences Monash University 381 Royal Parade Parkville VIC 3052 Australia
| | - Brian A. Baldo
- Kolling Institute of Medical Research Royal North Shore Hospital of Sydney St. Leonards NSW 2065 Australia
| | - Tzong‐Hsien Lee
- Department of Biochemistry and Molecular Biology Monash University Wellington Rd Clayton Vic 3800 Australia
| | - Marie‐Isabel Aguilar
- Department of Biochemistry and Molecular Biology Monash University Wellington Rd Clayton Vic 3800 Australia
| | - Jennifer R. Deuis
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Irina Vetter
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Alysha G. Elliott
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Maite Amado
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Matthew A. Cooper
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Dianne Alewood
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Paul F. Alewood
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
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22
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Dekan Z, Headey SJ, Scanlon M, Baldo BA, Lee T, Aguilar M, Deuis JR, Vetter I, Elliott AG, Amado M, Cooper MA, Alewood D, Alewood PF. Δ‐Myrtoxin‐Mp1a is a Helical Heterodimer from the Venom of the Jack Jumper Ant that has Antimicrobial, Membrane‐Disrupting, and Nociceptive Activities. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Zoltan Dekan
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Stephen J. Headey
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences Monash University 381 Royal Parade Parkville VIC 3052 Australia
| | - Martin Scanlon
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences Monash University 381 Royal Parade Parkville VIC 3052 Australia
| | - Brian A. Baldo
- Kolling Institute of Medical Research Royal North Shore Hospital of Sydney St. Leonards NSW 2065 Australia
| | - Tzong‐Hsien Lee
- Department of Biochemistry and Molecular Biology Monash University Wellington Rd Clayton Vic 3800 Australia
| | - Marie‐Isabel Aguilar
- Department of Biochemistry and Molecular Biology Monash University Wellington Rd Clayton Vic 3800 Australia
| | - Jennifer R. Deuis
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Irina Vetter
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Alysha G. Elliott
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Maite Amado
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Matthew A. Cooper
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Dianne Alewood
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
| | - Paul F. Alewood
- Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia
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23
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Alaybeyoglu B, Uluocak BG, Akbulut BS, Ozkirimli E. The effect of a beta-lactamase inhibitor peptide on bacterial membrane structure and integrity: a comparative study. J Pept Sci 2017; 23:374-383. [PMID: 28299853 DOI: 10.1002/psc.2986] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Accepted: 01/31/2017] [Indexed: 12/31/2022]
Abstract
Co-administration of beta-lactam antibiotics and beta-lactamase inhibitors has been a favored treatment strategy against beta-lactamase-mediated bacterial antibiotic resistance, but the emergence of beta-lactamases resistant to current inhibitors necessitates the discovery of novel non-beta-lactam inhibitors. Peptides derived from the Ala46-Tyr51 region of the beta-lactamase inhibitor protein are considered as potent inhibitors of beta-lactamase; unfortunately, peptide delivery into the cell limits their potential. The properties of cell-penetrating peptides could guide the design of beta-lactamase inhibitory peptides. Here, our goal is to modify the peptide with the sequence RRGHYY that possesses beta-lactamase inhibitory activity under in vitro conditions. Inspired by the work on the cell-penetrating peptide pVEC, our approach involved the addition of the N-terminal hydrophobic residues, LLIIL, from pVEC to the inhibitor peptide to build a chimera. These residues have been reported to be critical in the uptake of pVEC. We tested the potential of RRGHYY and its chimeric derivative as a beta-lactamase inhibitory peptide on Escherichia coli cells and compared the results with the action of the antimicrobial peptide melittin, the beta-lactam antibiotic ampicillin, and the beta-lactamase inhibitor potassium clavulanate to get mechanistic details on their action. Our results show that the addition of LLIIL to the N-terminus of the beta-lactamase inhibitory peptide RRGHYY increases its membrane permeabilizing potential. Interestingly, the addition of this short stretch of hydrophobic residues also modified the inhibitory peptide such that it acquired antimicrobial property. We propose that addition of the hydrophobic LLIIL residues to the peptide N-terminus offers a promising strategy to design novel antimicrobial peptides in the battle against antibiotic resistance. Copyright © 2017 European Peptide Society and John Wiley & Sons, Ltd.
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Affiliation(s)
- Begum Alaybeyoglu
- Chemical Engineering Department, Bogazici University, Bebek, 34342, Istanbul, Turkey
| | - Bilge Gedik Uluocak
- Advanced Technologies R&D Center, Bogazici University, Bebek, 34342, Istanbul, Turkey
| | | | - Elif Ozkirimli
- Chemical Engineering Department, Bogazici University, Bebek, 34342, Istanbul, Turkey
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24
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Payne J, Lee TH, Anderson M, Aguilar MI. Examination of the Interaction between a Membrane Active Peptide and Artificial Bilayers by Dual Polarisation Interferometry. Bio Protoc 2017; 7:e2087. [DOI: 10.21769/bioprotoc.2087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 10/07/2016] [Accepted: 12/06/2016] [Indexed: 11/02/2022] Open
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25
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Pagnussatt FA, de Lima VR, Dora CL, Costa JAV, Putaux JL, Badiale-Furlong E. Assessment of the encapsulation effect of phenolic compounds from Spirulina sp. LEB-18 on their antifusarium activities. Food Chem 2016; 211:616-23. [DOI: 10.1016/j.foodchem.2016.05.098] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 05/14/2016] [Accepted: 05/16/2016] [Indexed: 10/21/2022]
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26
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Bunker A, Magarkar A, Viitala T. Rational design of liposomal drug delivery systems, a review: Combined experimental and computational studies of lipid membranes, liposomes and their PEGylation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2334-2352. [DOI: 10.1016/j.bbamem.2016.02.025] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/09/2016] [Accepted: 02/10/2016] [Indexed: 01/22/2023]
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27
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Hirst DJ, Lee TH, Kulkarni K, Wilce JA, Aguilar MI. The impact of cell-penetrating peptides on membrane bilayer structure during binding and insertion. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:1841-9. [PMID: 27163492 DOI: 10.1016/j.bbamem.2016.05.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 04/27/2016] [Accepted: 05/03/2016] [Indexed: 11/29/2022]
Abstract
We have studied the effect of penetratin and a truncated analogue on the bilayer structure using dual polarisation interferometry, to simultaneously measure changes in mass per unit area and birefringence (an optical parameter representing bilayer order) with high sensitivity during the binding and dissociation from the membrane. Specifically, we studied penetratin (RQIKIWFQNRRMKWKK), along with a shortened and biotinylated version known as R8K-biotin (RRMKWKKK(Biotin)-NH2). Overall both peptides bound only weakly to the neutral DMPC and POPC bilayers, while much higher binding was observed for the anionic DMPC/DMPG and POPC/POPG. The binding of penetratin to gel-phase DMPC/DMPG was adequately represented by a two-state model, whereas on the fluid-phase POPC/POPG it exhibited a distinctly different binding pattern, best represented by a three-state kinetic model. However, R8K-biotin did not bind well to DMPC/DMPG and showed a more transitory and superficial binding to POPC/POPG. Comparing the modelling results for both peptides binding to POPC/POPG suggests an important role for a securely bound intermediate prior to penetratin insertion and translocation. Overall these results further elucidate the mechanism of penetratin, and provide another example of the significance of the ability of DPI to measure structural changes and the use of kinetic analysis to investigate the stages of peptide-membrane interactions.
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Affiliation(s)
- Daniel J Hirst
- Department of Biochemistry and Molecular Biology, Monash University, Melbourne 3800,Australia
| | - Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University, Melbourne 3800,Australia
| | - Ketav Kulkarni
- Department of Biochemistry and Molecular Biology, Monash University, Melbourne 3800,Australia
| | - Jacqueline A Wilce
- Department of Biochemistry and Molecular Biology, Monash University, Melbourne 3800,Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University, Melbourne 3800,Australia.
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28
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Deuis JR, Dekan Z, Inserra MC, Lee TH, Aguilar MI, Craik DJ, Lewis RJ, Alewood PF, Mobli M, Schroeder CI, Henriques ST, Vetter I. Development of a μO-Conotoxin Analogue with Improved Lipid Membrane Interactions and Potency for the Analgesic Sodium Channel NaV1.8. J Biol Chem 2016; 291:11829-42. [PMID: 27026701 DOI: 10.1074/jbc.m116.721662] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Indexed: 12/19/2022] Open
Abstract
The μO-conotoxins MrVIA, MrVIB, and MfVIA inhibit the voltage-gated sodium channel NaV1.8, a well described target for the treatment of pain; however, little is known about the residues or structural elements that define this activity. In this study, we determined the three-dimensional structure of MfVIA, examined its membrane binding properties, performed alanine-scanning mutagenesis, and identified residues important for its activity at human NaV1.8. A second round of mutations resulted in (E5K,E8K)MfVIA, a double mutant with greater positive surface charge and greater affinity for lipid membranes compared with MfVIA. This analogue had increased potency at NaV1.8 and was analgesic in the mouse formalin assay.
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Affiliation(s)
- Jennifer R Deuis
- From the Institute for Molecular Bioscience and School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia, and
| | | | - Marco C Inserra
- From the Institute for Molecular Bioscience and School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia, and
| | - Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | | | | | | | - Mehdi Mobli
- Centre for Advanced Imaging, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | | | | | - Irina Vetter
- From the Institute for Molecular Bioscience and School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia, and
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29
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Wayment-Steele HK, Jing Y, Swann MJ, Johnson LE, Agnarsson B, Svedhem S, Johal MS, Kunze A. Effects of Al(3+) on Phosphocholine and Phosphoglycerol Containing Solid Supported Lipid Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1771-1781. [PMID: 26783873 DOI: 10.1021/acs.langmuir.5b03999] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Aluminum has attracted great attention recently as it has been suggested by several studies to be associated with increased risks for Alzheimer's and Parkinson's disease. The toxicity of the trivalent ion is assumed to derive from structural changes induced in lipid bilayers upon binding, though the mechanism of this process is still not well understood. In the present study we elucidate the effect of Al(3+) on supported lipid bilayers (SLBs) using fluorescence microscopy, the quartz crystal microbalance with dissipation (QCM-D) technique, dual-polarization interferometry (DPI), and molecular dynamics (MD) simulations. Results from these techniques show that binding of Al(3+) to SLBs containing negatively charged and neutral phospholipids induces irreversible changes such as domain formation. The measured variations in SLB thickness, birefringence, and density indicate a phase transition from a disordered to a densely packed ordered phase.
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Affiliation(s)
- Hannah K Wayment-Steele
- Department of Chemistry, Pomona College , 645 North College Ave., Claremont, California 91711, United States
| | - Yujia Jing
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - Marcus J Swann
- Swann Scientific Consulting Ltd., 110 Sandy Lane, Lymm, Cheshire, U.K
| | - Lewis E Johnson
- Department of Chemistry, Pomona College , 645 North College Ave., Claremont, California 91711, United States
- Department of Chemistry, University of Washington , 109 Bagley Hall, Seattle, Washington 98195, United States
| | - Björn Agnarsson
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - Sofia Svedhem
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
| | - Malkiat S Johal
- Department of Chemistry, Pomona College , 645 North College Ave., Claremont, California 91711, United States
| | - Angelika Kunze
- Department of Applied Physics, Chalmers University of Technology , 412 96 Göteborg, Sweden
- Institute of Physical Chemistry, University of Göttingen , 37077 Göttingen, Germany
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30
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Payne JAE, Bleackley MR, Lee TH, Shafee TMA, Poon IKH, Hulett MD, Aguilar MI, van der Weerden NL, Anderson MA. The plant defensin NaD1 introduces membrane disorder through a specific interaction with the lipid, phosphatidylinositol 4,5 bisphosphate. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:1099-109. [PMID: 26896695 DOI: 10.1016/j.bbamem.2016.02.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 02/10/2016] [Accepted: 02/13/2016] [Indexed: 10/22/2022]
Abstract
Plant defensins interact with phospholipids in bilayers as part of their cytotoxic activity. Solanaceous class II defensins with the loop 5 sequence pattern "S-[KR]-[ILVQ]-[ILVQ]-[KR]-[KR]" interact with PI(4,5)P2. Here, the prototypical defensin of this class, NaD1, is used to characterise the biophysical interactions between these defensins and phospholipid bilayers. Binding of NaD1 to bilayers containing PI(4,5)P2 occurs rapidly and the interaction is very strong. Dual polarisation interferometry revealed that NaD1 does not dissociate from bilayers containing PI(4,5)P2. Binding of NaD1 to bilayers with or without PI(4,5)P2 induced disorder in the bilayer. However, permeabilisation assays revealed that NaD1 only permeabilised liposomes with PI(4,5)P2 in the bilayer, suggesting a role for this protein-lipid interaction in the plasma membrane permeabilising activity of this defensin. No defensins in the available databases have the PI(4,5)P2 binding sequence outside the solanaceous class II defensins, leading to the hypothesis that PI(4,5)P2 binding co-evolved with the C-terminal propeptide to protect the host cell against the effects of the tight binding of these defensins to their cognate lipid as they travel along the secretory pathway. This data has allowed us to develop a new model to explain how this class of defensins permeabilises plasma membranes to kill target cells.
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Affiliation(s)
- Jennifer A E Payne
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Mark R Bleackley
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Tzong-Hsien Lee
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| | - Thomas M A Shafee
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Ivan K H Poon
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Mark D Hulett
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Marie-Isabel Aguilar
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| | - Nicole L van der Weerden
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Marilyn A Anderson
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia.
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31
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Shahmiri M, Enciso M, Mechler A. Controls and constrains of the membrane disrupting action of Aurein 1.2. Sci Rep 2015; 5:16378. [PMID: 26574052 PMCID: PMC4648102 DOI: 10.1038/srep16378] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 10/13/2015] [Indexed: 11/21/2022] Open
Abstract
Aurein 1.2 is a 13 residue antimicrobial peptide secreted by the Australian tree frog Litoria Aurea. It is a surface-acting membrane disrupting peptide that permeabilizes bacterial membranes via the carpet mechanism; the molecular details of this process are mostly unknown. Here the mechanism of action of Aurein 1.2 was investigated with an emphasis on the role of membrane charge and C-terminal amidation of the peptide. Using quartz crystal microbalance (QCM) fingerprinting it was found that the membrane charge correlates with membrane affinity of the peptide, however the binding and the membrane disrupting processes are not charge driven; increased membrane charge reduces the membrane disrupting activity. Coarse grain simulations revealed that phenylalanine residues act as membrane anchors. Accordingly Aurein 1.2 has the ability to bind to any membrane. Furthermore, bundling precludes membrane disruption in case of wild type peptides, while non C-terminal amidated peptides form random aggregates leading to detachment from the membrane. Hence C-terminal amidation is crucial for Aurein 1.2 action. Our results suggest that Aurein 1.2 acts via aggregation driven membrane penetration. The concomitant change in the tension of the outer leaflet imposes a spontaneous curvature on the membrane, leading to disintegration.
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Affiliation(s)
- Mahdi Shahmiri
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora Vic 3086, Australia
| | - Marta Enciso
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora Vic 3086, Australia
| | - Adam Mechler
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora Vic 3086, Australia
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32
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Sani MA, Lee TH, Aguilar MI, Separovic F. Proline-15 creates an amphipathic wedge in maculatin 1.1 peptides that drives lipid membrane disruption. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2277-89. [DOI: 10.1016/j.bbamem.2015.06.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 06/05/2015] [Accepted: 06/11/2015] [Indexed: 11/28/2022]
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33
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Hasan IY, Mechler A. Viscoelastic changes measured in partially suspended single bilayer membranes. SOFT MATTER 2015; 11:5571-5579. [PMID: 26073288 DOI: 10.1039/c5sm00278h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
For studies involving biomimetic phospholipid membrane systems, such as membrane-protein interactions, it is crucial that the supported membrane is biomimetic in its physical properties as well as in its composition. Two often overlooked aspects of biomimicry are the need for unrestrained lipid mobility, reflected in the viscoelastic properties of the membrane, and sufficient space between the membrane and the support for the insertion of transmembrane proteins. Here we show for a series of DMPC-based membranes that a partially suspended single bilayer membrane can be formed on functionalized gold surface without tethering. These membranes exhibit sufficient freedom of motion to represent the viscoelastic properties of a free lamellar bilayer membrane as demonstrated by determining the phase transition temperatures of these single bilayer membranes from the viscosity change upon chain melting using the dissipation signal of a quartz crystal microbalance (QCM-D). Atomic force microscopy imaging confirmed confluent, smooth membrane coverage of the QCM-D sensor that completely obscured the roughness of the sputtered gold surface. High-force AFM imaging was able to push membrane patches into the valleys of the gold morphology, confirming the inherently suspended nature of the MPA supported membrane. We show that the correlation between frequency and dissipation changes in the QCM-D sensograms is a sensitive indicator of the morphology of the membrane.
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Affiliation(s)
- Imad Younus Hasan
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Australia.
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34
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Helix 8 of the angiotensin- II type 1A receptor interacts with phosphatidylinositol phosphates and modulates membrane insertion. Sci Rep 2015; 5:9972. [PMID: 26126083 PMCID: PMC5378882 DOI: 10.1038/srep09972] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 03/26/2015] [Indexed: 11/16/2022] Open
Abstract
The carboxyl-terminus of the type 1 angiotensin II receptor (AT1A) regulates receptor activation/deactivation and the amphipathic Helix 8 within the carboxyl-terminus is a high affinity interaction motif for plasma membrane lipids. We have used dual polarisation interferometry (DPI) to examine the role of phosphatidylinositdes in the specific recognition of Helix 8 in the AT1A receptor. A synthetic peptide corresponding to Leu305 to Lys325 (Helix 8 AT1A) discriminated between PIPs and different charges on lipid membranes. Peptide binding to PtdIns(4)P-containing bilayers caused a dramatic change in the birefringence (a measure of membrane order) of the bilayer. Kinetic modelling showed that PtdIns(4)P is held above the bilayer until the mass of bound peptide reaches a threshold, after which the peptides insert further into the bilayer. This suggests that Helix 8 can respond to the presence of PI(4)P by withdrawing from the bilayer, resulting in a functional conformational change in the receptor.
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35
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Lee TH, Hirst DJ, Aguilar MI. New insights into the molecular mechanisms of biomembrane structural changes and interactions by optical biosensor technology. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:1868-85. [PMID: 26009270 DOI: 10.1016/j.bbamem.2015.05.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 05/15/2015] [Accepted: 05/17/2015] [Indexed: 12/31/2022]
Abstract
Biomolecular-membrane interactions play a critical role in the regulation of many important biological processes such as protein trafficking, cellular signalling and ion channel formation. Peptide/protein-membrane interactions can also destabilise and damage the membrane which can lead to cell death. Characterisation of the molecular details of these binding-mediated membrane destabilisation processes is therefore central to understanding cellular events such as antimicrobial action, membrane-mediated amyloid aggregation, and apoptotic protein induced mitochondrial membrane permeabilisation. Optical biosensors have provided a unique approach to characterising membrane interactions allowing quantitation of binding events and new insight into the kinetic mechanism of these interactions. One of the most commonly used optical biosensor technologies is surface plasmon resonance (SPR) and there have been an increasing number of studies reporting the use of this technique for investigating biophysical analysis of membrane-mediated events. More recently, a number of new optical biosensors based on waveguide techniques have been developed, allowing membrane structure changes to be measured simultaneously with mass binding measurements. These techniques include dual polarisation interferometry (DPI), plasmon waveguide resonance spectroscopy (PWR) and optical waveguide light mode spectroscopy (OWLS). These techniques have expanded the application of optical biosensors to allow the analysis of membrane structure changes during peptide and protein binding. This review provides a theoretical and practical overview of the application of biosensor technology with a specific focus on DPI, PWR and OWLS to study biomembrane-mediated events and the mechanism of biomembrane disruption. This article is part of a Special Issue entitled: Lipid-protein interactions.
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Affiliation(s)
- Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University, Wellington Rd, Clayton, VIC 3800, Australia
| | - Daniel J Hirst
- Department of Biochemistry and Molecular Biology, Monash University, Wellington Rd, Clayton, VIC 3800, Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University, Wellington Rd, Clayton, VIC 3800, Australia.
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36
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Kinetic study of all-or-none hemolysis induced by cationic amphiphilic polymethacrylates with antimicrobial activity. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2015.01.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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37
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Soblosky L, Ramamoorthy A, Chen Z. Membrane interaction of antimicrobial peptides using E. coli lipid extract as model bacterial cell membranes and SFG spectroscopy. Chem Phys Lipids 2015; 187:20-33. [PMID: 25707312 DOI: 10.1016/j.chemphyslip.2015.02.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 02/17/2015] [Accepted: 02/18/2015] [Indexed: 12/17/2022]
Abstract
Supported lipid bilayers are used as a convenient model cell membrane system to study biologically important molecule-lipid interactions in situ. However, the lipid bilayer models are often simple and the acquired results with these models may not provide all pertinent information related to a real cell membrane. In this work, we use sum frequency generation (SFG) vibrational spectroscopy to study molecular-level interactions between the antimicrobial peptides (AMPs) MSI-594, ovispirin-1 G18, magainin 2 and a simple 1,2-dipalmitoyl-d62-sn-glycero-3-phosphoglycerol (dDPPG)/1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol (POPG) bilayer. We compared such interactions to those between the AMPs and a more complex dDPPG/Escherichia coli (E. coli) polar lipid extract bilayer. We show that to fully understand more complex aspects of peptide-bilayer interaction, such as interaction kinetics, a heterogeneous lipid composition is required, such as the E. coli polar lipid extract. The discrepancy in peptide-bilayer interaction is likely due in part to the difference in bilayer charge between the two systems since highly negative charged lipids can promote more favorable electrostatic interactions between the peptide and lipid bilayer. Results presented in this paper indicate that more complex model bilayers are needed to accurately analyze peptide-cell membrane interactions and demonstrates the importance of using an appropriate lipid composition to study AMP interaction properties.
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Affiliation(s)
- Lauren Soblosky
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA; Biophysics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Zhan Chen
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA; Biophysics, University of Michigan, Ann Arbor, MI 48109, USA.
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38
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Escorihuela J, González-Martínez MÁ, López-Paz JL, Puchades R, Maquieira Á, Gimenez-Romero D. Dual-Polarization Interferometry: A Novel Technique To Light up the Nanomolecular World. Chem Rev 2014; 115:265-94. [DOI: 10.1021/cr5002063] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jorge Escorihuela
- Department
of Chemistry, Institute of Molecular Recognition and Technological
Development, Universitat Politècnica de València, Camino
de Vera s/n, 46022 València, Spain
| | - Miguel Ángel González-Martínez
- Department
of Chemistry, Institute of Molecular Recognition and Technological
Development, Universitat Politècnica de València, Camino
de Vera s/n, 46022 València, Spain
| | - José Luis López-Paz
- Department
of Chemistry, Institute of Molecular Recognition and Technological
Development, Universitat Politècnica de València, Camino
de Vera s/n, 46022 València, Spain
| | - Rosa Puchades
- Department
of Chemistry, Institute of Molecular Recognition and Technological
Development, Universitat Politècnica de València, Camino
de Vera s/n, 46022 València, Spain
| | - Ángel Maquieira
- Department
of Chemistry, Institute of Molecular Recognition and Technological
Development, Universitat Politècnica de València, Camino
de Vera s/n, 46022 València, Spain
| | - David Gimenez-Romero
- Physical
Chemistry Department, Faculty of Chemistry, Universitat de València, Avenida Dr. Moliner 50, 46100 Burjassot, València, Spain
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39
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Jamasbi E, Batinovic S, Sharples RA, Sani MA, Robins-Browne RM, Wade JD, Separovic F, Hossain MA. Melittin peptides exhibit different activity on different cells and model membranes. Amino Acids 2014; 46:2759-66. [DOI: 10.1007/s00726-014-1833-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 08/26/2014] [Indexed: 11/30/2022]
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Real-time measurement of membrane conformational states induced by antimicrobial peptides: balance between recovery and lysis. Sci Rep 2014; 4:5479. [PMID: 24969959 PMCID: PMC4073255 DOI: 10.1038/srep05479] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 06/09/2014] [Indexed: 11/30/2022] Open
Abstract
The disruption of membranes by antimicrobial peptides is a multi-state process involving significant structural changes in the phospholipid bilayer. However, direct measurement of these membrane structural changes is lacking. We used a combination of dual polarisation interferometry (DPI), surface plasmon resonance spectroscopy (SPR) and atomic force microscopy (AFM) to measure the real-time changes in membrane structure through the measurement of birefringence during the binding of magainin 2 (Mag2) and a highly potent analogue in which Ser8, Gly13 and Gly18 has been replaced with alanine (Mag-A). We show that the membrane bilayer undergoes a series of structural changes upon peptide binding before a critical threshold concentration is reached which triggers a significant membrane disturbance. We also propose a detailed model for antimicrobial peptide action as a function of the degree of bilayer disruption to provide an unprecedented in-depth understanding of the membrane lysis in terms of the interconversion of different membrane conformational states in which there is a balance between recovery and lysis.
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41
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An antimicrobial helix A-derived peptide of heparin cofactor II blocks endotoxin responses in vivo. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:1225-34. [DOI: 10.1016/j.bbamem.2014.01.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 01/22/2014] [Accepted: 01/27/2014] [Indexed: 11/18/2022]
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42
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Zheng Y, Yang C, Yang F, Yang X. Real-time study of interactions between cytosine-cytosine pairs in DNA oligonucleotides and silver ions using dual polarization interferometry. Anal Chem 2014; 86:3849-55. [PMID: 24611666 DOI: 10.1021/ac403992r] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The real-time conformational changes of cytosine (C)-rich ssDNA oligonucleotides upon binding with silver ions (Ag(+)) were studied using dual polarization interferometry (DPI). Upon the addition of Ag(+), Ag(+) selectively bound to cytosine-cytosine mismatches and formed C-Ag(+)-C complexes, inducing change of the structure of the C-rich ssDNA from random coil conformation to duplex conformation, whereas the control ssDNA without cytosine-cytosine mismatches had no such signal, which was consistent with circular dichroism (CD) characterization. The conformational change of DNA was reflected on the changes of the mass, thickness, and density values resolved by DPI. The calibration curves showed that as the concentration of Ag(+) increased from 10 nM to 8 μM, the thickness and mass values increased linearly while the density values decreased linearly. Other metal ions such as K(+), Ca(2+), Na(+), Mg(2+), Zn(2+), Mn(2+), Ni(2+), and Pb(2+) did not interfere with the interaction between Ag(+) and C-rich ssDNA, indicating that this method had a good selectivity. The practical application of this biosensor was also investigated in real samples such as drinking water. Besides, cysteine could specifically capture Ag(+) from C-Ag(+)-C complexes and transformed the structure of the C-rich DNA back from rigid double-stranded conformation to random coil conformation, which allowed cysteine to be detected selectively as well. It is expected that this biosensing strategy may be utilized to study the interaction of DNA with other molecules.
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Affiliation(s)
- Yu Zheng
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
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43
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Granqvist N, Yliperttula M, Välimäki S, Pulkkinen P, Tenhu H, Viitala T. Control of the morphology of lipid layers by substrate surface chemistry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2799-809. [PMID: 24564782 DOI: 10.1021/la4046622] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In this study, surface coatings were used to control the morphology of the deposited lipid layers during vesicle spreading, i.e., to control if liposomes self-assemble on a surface into a supported lipid bilayer or a supported vesicular layer. The influence of the properties of the surface coating on formation of the deposited lipid layer was studied with quartz crystal microbalance and two-wavelength multiparametric surface plasmon resonance techniques. Control of lipid self-assembly on the surface was achieved by two different types of soft substrate materials, i.e., dextran and thiolated polyethylene glycol, functionalized with hydrophobic linkers for capturing the lipid layer. The low-molecular-weight dextran-based surface promoted formation of supported lipid bilayers, while the thiolated polyethylene glycol-based surface promoted supported vesicular layer formation. A silicon dioxide surface was used as a reference surface in both measurement techniques. In addition to promoting supported lipid bilayer formation of known lipid mixtures, the dextran surface also promoted supported lipid bilayer formation of vesicles containing the cell membrane extract of human hepatoblastoma cells. The new dextran-based surface was also capable of protecting the supported lipid bilayer against dehydration when exposed to a constant flow of air. The well-established quartz crystal microbalance technique was effective in determining the morphology of the formed lipid layer, while the two-wavelength surface plasmon resonance analysis enabled further complementary characterization of the adsorbed supported lipid bilayers and supported vesicular layers.
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Affiliation(s)
- Niko Granqvist
- Faculty of Pharmacy, Division of Biopharmaceutics and Pharmacokinetics, University of Helsinki, P.O. Box 56, 00014, Helsinki, Finland, and ‡Faculty of Chemistry, Laboratory of Polymer Chemistry, University of Helsinki , P.O. Box 55, 00014 Helsinki, Finland
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44
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Comparison of reversible membrane destabilisation induced by antimicrobial peptides derived from Australian frogs. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2205-15. [PMID: 24593995 DOI: 10.1016/j.bbamem.2014.02.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/21/2014] [Accepted: 02/21/2014] [Indexed: 12/28/2022]
Abstract
The membrane destabilising properties of the antimicrobial peptides (AMP) aurein 1.2, citropin 1.1, maculatin 1.1 and caerin 1.1, have been studied by dual polarisation interferometry (DPI). The overall process of peptide induced membrane destabilisation was examined by the changes in bilayer order as a function of membrane-bound peptide mass per unit area and revealed three different modes of action. Aurein 1.2 was the only peptide that significantly destabilised the neutral membrane (DMPC), while all four peptides induced destabilisation of the negatively charged membrane (DMPC/DMPG). On DMPC, citropin 1.1, maculatin 1.1 and caerin 1.1 bound irreversibly at low concentrations but caused a reversible drop in the bilayer order. In contrast to DMPC/DMPG, these three peptides caused a mass drop at the higher concentrations, which may correspond to insertion and bilayer expansion. The critical level of bound peptide necessary to induce membrane destabilisation (peptide:lipid ratio) was determined and correlated with peptide structure. As the most lytic peptide, aurein 1.2 adsorbed strongly prior to dissolution of the bilayer. In contrast, the binding of citropin 1.1, maculatin 1.1 and caerin 1.1 needed to reach a critical level prior to insertion into the membrane and incremental expansion and disruption. Our results demonstrate that sequential events can be monitored in real-time under fluidic conditions to elucidate the complex molecular mechanism of AMP action. In particular, the analysis of birefringence in real time allows the description of a detailed mechanistic model of the impact of peptides on the membrane bilayer order. This article is part of a Special Issue entitled: Interfacially Active Peptides and Proteins. Guest Editors: William C. Wimley and Kalina Hristova.
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45
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Balhara V, Deshmukh SS, Kálmán L, Kornblatt JA. The interaction of streptococcal enolase with canine plasminogen: the role of surfaces in complex formation. PLoS One 2014; 9:e88395. [PMID: 24520380 PMCID: PMC3919783 DOI: 10.1371/journal.pone.0088395] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 01/05/2014] [Indexed: 11/18/2022] Open
Abstract
The enolase from Streptococcus pyogenes (Str enolase F137L/E363G) is a homo-octamer shaped like a donut. Plasminogen (Pgn) is a monomeric protein composed of seven discrete separated domains organized into a lock washer. The enolase is known to bind Pgn. In past work we searched for conditions in which the two proteins would bind to one another. The two native proteins in solution would not bind under any of the tried conditions. We found that if the structures were perturbed binding would occur. We stated that only the non-native Str enolase or Pgn would interact such that we could detect binding. We report here the results of a series of dual polarization interferometry (DPI) experiments coupled with atomic force microscopy (AFM), isothermal titration calorimetry (ITC), dynamic light scattering (DLS), and fluorescence. We show that the critical condition for forming stable complexes of the two native proteins involves Str enolase binding to a surface. Surfaces that attract Str enolase are a sufficient condition for binding Pgn. Under certain conditions, Pgn adsorbed to a surface will bind Str enolase.
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Affiliation(s)
- Vinod Balhara
- Department of Chemistry and Biochemistry, Concordia University, Montréal, Quebec, Canada
| | | | - László Kálmán
- Department of Physics, Concordia University, Montréal, Quebec, Canada
| | - Jack A. Kornblatt
- Department of Biology and the Centre for Structural and Functional Genomics, Concordia University, Montréal, Quebec, Canada
- * E-mail:
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46
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Singh S, Papareddy P, Kalle M, Schmidtchen A, Malmsten M. Effects of linear amphiphilicity on membrane interactions of C-terminal thrombin peptides. RSC Adv 2014. [DOI: 10.1039/c4ra05420b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Highly amphiphilic WFF25 forms aggregates in solution and at membranes. The terminal W/F stretch provides membrane selectivity for WFF25. Pronounced LTA and LPS interactions influence bactericidal effects.
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Affiliation(s)
- Shalini Singh
- Department of Pharmacy
- Uppsala University
- Uppsala, Sweden
| | - Praveen Papareddy
- Division of Dermatology and Venereology
- Department of Clinical Sciences
- Lund University
- SE-221 84 Lund, Sweden
| | - Martina Kalle
- Division of Dermatology and Venereology
- Department of Clinical Sciences
- Lund University
- SE-221 84 Lund, Sweden
| | - Artur Schmidtchen
- Division of Dermatology and Venereology
- Department of Clinical Sciences
- Lund University
- SE-221 84 Lund, Sweden
- Dermatology
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47
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Duan M, Wang H, Fang S, Liang Y. Real-time monitoring the adsorption of sodium dodecyl sulfate on a hydrophobic surface using dual polarization interferometry. J Colloid Interface Sci 2013; 417:285-92. [PMID: 24407689 DOI: 10.1016/j.jcis.2013.11.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Revised: 11/17/2013] [Accepted: 11/19/2013] [Indexed: 11/18/2022]
Abstract
The adsorption process of sodium dodecyl sulfate (SDS) at a hydrophobic layer was investigated by dual polarization interferometry (DPI), which provided the real-time information at solid/liquid interface. In dilute solution, the molecules adsorb at the surface as isotropic layer. With the increase in concentration, the molecules aggregate to form hemimicelles and the critical hemimicelles concentration (HMC) is 1 mM. The adsorption of SDS at C18 surface obeys two-step process. The competitive formations of micelles in solution and hemimicelles on C18 surface lead to particular adsorption behavior in higher concentration. We also proposed a four-stage adsorption model of SDS at C18 surface according to bulk concentration.
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Affiliation(s)
- Ming Duan
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China.
| | - Hu Wang
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China.
| | - Shenwen Fang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
| | - Ying Liang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
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48
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Importance of lipopolysaccharide aggregate disruption for the anti-endotoxic effects of heparin cofactor II peptides. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:2709-19. [DOI: 10.1016/j.bbamem.2013.06.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Revised: 06/12/2013] [Accepted: 06/14/2013] [Indexed: 11/21/2022]
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49
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Hirst DJ, Lee TH, Swann MJ, Aguilar MI. Combined mass and structural kinetic analysis of multistate antimicrobial peptide-membrane interactions. Anal Chem 2013; 85:9296-304. [PMID: 23998643 DOI: 10.1021/ac402148v] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Kinetic analysis of peptide-membrane interactions generally involves a curve fitting process with no information about what the different curves may physically correspond to. Given the multistep process of peptide-membrane interactions, a computational method that utilizes physical parameters that relate to both peptide binding and membrane structure would provide new insight into this complex process. In this study, kinetic models accounting for two-state and three-state mechanisms were fitted to our previously reported simultaneous real-time measurements of mass and birefringence during the binding and dissociation of the peptide HPA3 (Hirst, D.; Lee, T.-H.; Swann, M.; Unabia, S.; Park, Y.; Hahm, K.-S.; Aguilar, M. Eur. Biophys. J. 2011, 40, 503-514); significantly, the mass and birefringence are constrained by the same set of kinetic constants, allowing the unification of peptide binding patterns with membrane structure changes. For the saturated phospholipid dimyristoyl-phosphatidylcholine (DMPC) the two-state model was sufficient to account for the observed changes in mass and birefringence, whereas for the unsaturated phospholipid 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) the two-state model was found to be inadequate and a three-state model gave a significantly better fit. The third state of interaction for POPC was found to disrupt the bilayer much more than the previous two states. We propose a hypothesis for the mechanism of membrane permeabilization based on the results featuring a loosely bound first state, a tightly bound second state, and a highly membrane-disrupting third state. The results demonstrate the importance of the difference in membrane fluidity between the gel phase DMPC and the liquid crystal phase POPC for peptide-membrane interactions and establish the combination of DPI and kinetic modeling as a powerful tool for revealing features of peptide-membrane interaction mechanisms, including intermediate states between initial binding and full membrane disruption.
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Affiliation(s)
- Daniel J Hirst
- Department of Biochemistry and Molecular Biology, Monash University , Clayton, Victoria 3800, Australia
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50
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Balhara V, Schmidt R, Gorr SU, DeWolf C. Membrane selectivity and biophysical studies of the antimicrobial peptide GL13K. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:2193-203. [DOI: 10.1016/j.bbamem.2013.05.027] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/24/2013] [Accepted: 05/27/2013] [Indexed: 01/27/2023]
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