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Tan SW, Yoon BK, Jackman JA. Membrane-Disruptive Effects of Fatty Acid and Monoglyceride Mitigants on E. coli Bacteria-Derived Tethered Lipid Bilayers. Molecules 2024; 29:237. [PMID: 38202820 PMCID: PMC10780109 DOI: 10.3390/molecules29010237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 12/23/2023] [Accepted: 12/26/2023] [Indexed: 01/12/2024] Open
Abstract
We report electrochemical impedance spectroscopy measurements to characterize the membrane-disruptive properties of medium-chain fatty acid and monoglyceride mitigants interacting with tethered bilayer lipid membrane (tBLM) platforms composed of E. coli bacterial lipid extracts. The tested mitigants included capric acid (CA) and monocaprin (MC) with 10-carbon long hydrocarbon chains, and lauric acid (LA) and glycerol monolaurate (GML) with 12-carbon long hydrocarbon chains. All four mitigants disrupted E. coli tBLM platforms above their respective critical micelle concentration (CMC) values; however, there were marked differences in the extent of membrane disruption. In general, CA and MC caused larger changes in ionic permeability and structural damage, whereas the membrane-disruptive effects of LA and GML were appreciably smaller. Importantly, the distinct magnitudes of permeability changes agreed well with the known antibacterial activity levels of the different mitigants against E. coli, whereby CA and MC are inhibitory and LA and GML are non-inhibitory. Mechanistic insights obtained from the EIS data help to rationalize why CA and MC are more effective than LA and GML at disrupting E. coli membranes, and these measurement capabilities support the potential of utilizing bacterial lipid-derived tethered lipid bilayers for predictive assessment of antibacterial drug candidates and mitigants.
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Affiliation(s)
- Sue Woon Tan
- School of Chemical Engineering and Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Bo Kyeong Yoon
- School of Healthcare and Biomedical Engineering, Chonnam National University, Yeosu 59626, Republic of Korea
| | - Joshua A. Jackman
- School of Chemical Engineering and Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon 16419, Republic of Korea
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2
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Aloi E, Tone CM, Barberi RC, Ciuchi F, Bartucci R. Effects of curcumin in the interaction with cardiolipin-containg lipid monolayers and bilayers. Biophys Chem 2023; 301:107082. [PMID: 37544082 DOI: 10.1016/j.bpc.2023.107082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Revised: 07/21/2023] [Accepted: 07/30/2023] [Indexed: 08/08/2023]
Abstract
Curcumin, a plant polyphenol extracted from the Chinese herb turmeric, has gained widespread attention in recent years because of its multifunctional properties as antioxidant, antinflammatory, antimicrobial, and anticancer agent. Effects of the molecule on mitochondrial membranes properties have also been evidenced. In this work, the interaction of curcumin with models of mitochondrial membranes composed of dimyristoylphosphatidylcholine (DMPC) or mixtures of DMPC and 4 mol% tetramyristoylcardiolipin (TMCL) has been investigated by using biophysical techniques. Spectrophotometry and fluorescence allowed to determine the association constant and the binding energy of curcumin with pure DMPC and mixed DMPC/TMCL aqueous bilayers. The molecular organization of pure DMPC and cardiolipin-containing Langmuir monolayers at the air-water interface were investigated and the morphology of the monolayers transferred into mica substrates were characterized through atomic force microscopy (AFM). It is found that curcumin associates at the polar/apolar interface of the lipid bilayers and the binding is favored in the presence of cardiolipin. At 2 mol%, curcumin is well miscible with lipid monolayers, particularly with mixed DMPC/TMCL ones, where compact terraces formation characterized by a reduction of the surface roughness is observed in the AFM topographic images. At 10 mol%, curcumin perturbs the stability of DMPC monolayers and morphologically are evident terraces surrounded by cur aggregates. In the presence of TMCL, very few curcumin aggregates and larger compact terraces are observed. The overall results indicate that cardiolipin augments the incorporation of curcumin in model membranes highlighting the mutual interplay cardiolipin-curcumin in mitochondrial membranes.
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Affiliation(s)
- Erika Aloi
- Department of Physics, University of Calabria, 87036 Rende, Italy
| | - Caterina M Tone
- Department of Physics, University of Calabria, 87036 Rende, Italy; CNR Nanotec c/o Department of Physics, University of Calabria, 87036 Rende, Italy
| | - Riccardo C Barberi
- Department of Physics, University of Calabria, 87036 Rende, Italy; CNR Nanotec c/o Department of Physics, University of Calabria, 87036 Rende, Italy
| | - Federica Ciuchi
- CNR Nanotec c/o Department of Physics, University of Calabria, 87036 Rende, Italy.
| | - Rosa Bartucci
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, Italy.
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3
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Reis A, Teixeira JPF, Silva AMG, Ferreira M, Gameiro P, de Freitas V. Modelling Hyperglycaemia in an Epithelial Membrane Model: Biophysical Characterisation. Biomolecules 2022; 12:biom12101534. [PMID: 36291743 PMCID: PMC9599690 DOI: 10.3390/biom12101534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 10/12/2022] [Accepted: 10/14/2022] [Indexed: 11/16/2022] Open
Abstract
Biomimetic models are valuable platforms to improve our knowledge on the molecular mechanisms governing membrane-driven processes in (patho)physiological conditions, including membrane permeability, transport, and fusion. However, current membrane models are over simplistic and do not include the membrane’s lipid remodelling in response to extracellular stimuli. Our study describes the synthesis of glycated dimyristoyl-phosphatidylethanolamine (DMPE-glyc), which was structurally characterised by mass spectrometry (ESI-MS) and quantified by NMR spectroscopy to be further incorporated in a complex phospholipid (PL) membrane model enriched in cholesterol (Chol) and (glyco)sphingolipids (GSL) designed to mimic epithelial membranes (PL/Chol/GSL) under hyperglycaemia conditions. Characterisation of synthesised DMPE-glyc adducts by tandem mass spectrometry (ESI-MS/MS) show that synthetic DMPE-glyc adducts correspond to Amadori products and quantification by 1H NMR spectroscopy show that the yield of glycation reaction was 8%. The biophysical characterisation of the epithelial membrane model shows that excess glucose alters the thermotropic behaviour and fluidity of epithelial membrane models likely to impact permeability of solutes. The epithelial membrane models developed to mimic normo- and hyperglycaemic scenarios are the basis to investigate (poly)phenol-lipid and drug–membrane interactions crucial in nutrition, pharmaceutics, structural biochemistry, and medicinal chemistry.
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4
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Influence of Phase Transitions on Diffusive Molecular Transport Across Biological Membranes. Angew Chem Int Ed Engl 2022; 61:e202205608. [DOI: 10.1002/anie.202205608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Indexed: 11/07/2022]
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5
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Wu T, Wilhelm MJ, Ma J, Li Y, Wu Y, Dai HL. Influence of Phase Transitions on Diffusive Molecular Transport Across Biological Membranes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tong Wu
- Temple University Department of Chemistry UNITED STATES
| | - Michael J. Wilhelm
- Temple University Department of Chemistry 1901 N. 13th Street 19122 Philadelphia UNITED STATES
| | - Jianqiang Ma
- Temple University Department of Chemistry UNITED STATES
| | - Yujie Li
- Temple University Department of Chemistry UNITED STATES
| | - Yuhao Wu
- Temple University Department of Chemistry UNITED STATES
| | - Hai-Lung Dai
- Temple University Department of Chemistry UNITED STATES
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6
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Velez-Saboyá CS, Guzmán-Sepúlveda JR, Ruiz-Suárez JC. Phase transitions of liposomes: when light meets heat. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:124002. [PMID: 34936996 DOI: 10.1088/1361-648x/ac45b7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 12/22/2021] [Indexed: 06/14/2023]
Abstract
Phase transitions of liposomes are normally studied by differential scanning calorimetry. A suspension of liposomes is subjected to an increase (decrease) of temperature and when heat is absorbed (released), the liposomes transit from a gel (liquid) to a liquid (gel) phase. This endothermic (exothermic) process takes place at a temperature called the melting temperatureTm, which is distinctive of the type of lipids forming the vesicles. The vesicles, though, also modify their size in the transition. Indeed, the thickness of the membranes decreases (increases) because carbon tails misalign (align). Concomitant with the modifications in the membrane thickness, the diameter (D) of the liposomes changes too. Therefore, when they are inspected by light, the scattered signal carries information from such dilatation (contraction) process. We performed careful experiments using dynamic light scattering as a function of temperature to detect the size changes of different liposomes. Gaussian fits of the derivatives of theDvsTcurves coincide within 1% with thermograms, which hints to the possibility of performing thermodynamic studies of lipid systems employing light.
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Affiliation(s)
| | | | - J C Ruiz-Suárez
- CINVESTAV-Monterrey, PIIT, Apodaca, Nuevo León 66600, Mexico
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7
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Hayashi K, Mori I, Takeda K, Okada Y, Hayase A, Mori T, Nishioka Y, Manabe K. Analysis of hand environment factors contributing to the hand surface infection barrier imparted by lactic acid. Skin Res Technol 2021; 27:1135-1144. [PMID: 34532902 PMCID: PMC9293006 DOI: 10.1111/srt.13078] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 06/24/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Organic acids on the surface of human hands contribute to the barrier against transient pathogens. This is the first study to explore the synergistic contribution of lactic acid and other hand environment-related features on the antibacterial properties of the hand surface. MATERIALS AND METHODS We estimated the contribution of fingerprint depth, skin pH, stratum corneum water content, skin temperature, and sweat rate of the hands to the infection barrier using an observational survey of 105 subjects. The relationship between each factor and the antibacterial activity of the hands was analyzed using Pearson's correlation coefficient. We performed molecular dynamics simulations to study the interaction between lactic acid and bacterial membranes. RESULTS The amount of lactic acid on the hands and skin temperature contributed positively to the antimicrobial activity (r = 0.437 and P = 3.18 × 10-6 , r = 0.500 and P = 5.66 × 10-8 , respectively), while the skin pH contributed negatively (r = -0.471, P = 3.99 × 10-7 ). The predicted value of the combined antimicrobial effect of these parameters was [antimicrobial activity] = 0.21 × [lactic acid] - 0.25 × [skin pH] + 0.26 × [skin temperature] + 0.98. The coefficient of determination (R2 ) was 0.50. CONCLUSION The increase in the amount of non-ionic lactic acid due to lower pH and improvement in the fluidity of the cell membrane due to higher temperatures enable the efficient transport of lactic acid into cells and subsequent antimicrobial activity. The proposed mechanism could help to develop an effective hand infection barrier technology.
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Affiliation(s)
- Kaori Hayashi
- Personal Health Care Products Research Laboratories, Kao Corporation, Tokyo, Japan
| | - Ichiro Mori
- Personal Health Care Products Research Laboratories, Kao Corporation, Tokyo, Japan
| | - Kouske Takeda
- Analytical Science Laboratories, Kao Corporation, Wakayama, Japan
| | - Yasuhiro Okada
- Personal Health Care Products Research Laboratories, Kao Corporation, Tokyo, Japan
| | - Atsuko Hayase
- Biological Science Laboratories, Kao Corporation, Tochigi, Japan
| | - Takuya Mori
- Biological Science Laboratories, Kao Corporation, Tochigi, Japan
| | - Yuki Nishioka
- Personal Health Care Products Research Laboratories, Kao Corporation, Tokyo, Japan
| | - Kenji Manabe
- Personal Health Care Products Research Laboratories, Kao Corporation, Tokyo, Japan
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8
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Ferreira M, Gameiro P. Fluoroquinolone-Transition Metal Complexes: A Strategy to Overcome Bacterial Resistance. Microorganisms 2021; 9:microorganisms9071506. [PMID: 34361943 PMCID: PMC8303200 DOI: 10.3390/microorganisms9071506] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/01/2021] [Accepted: 07/08/2021] [Indexed: 01/12/2023] Open
Abstract
Fluoroquinolones (FQs) are antibiotics widely used in the clinical practice due to their large spectrum of action against Gram-negative and some Gram-positive bacteria. Nevertheless, the misuse and overuse of these antibiotics has triggered the development of bacterial resistance mechanisms. One of the strategies to circumvent this problem is the complexation of FQs with transition metal ions, known as metalloantibiotics, which can promote different activity and enhanced pharmacological behaviour. Here, we discuss the stability of FQ metalloantibiotics and their possible translocation pathways. The main goal of the present review is to frame the present knowledge on the conjunction of biophysical and biological tools that can help to unravel the antibacterial action of FQ metalloantibiotics. An additional goal is to shed light on the studies that must be accomplished to ensure stability and viability of such metalloantibiotics. Potentiometric, spectroscopic, microscopic, microbiological, and computational techniques are surveyed. Stability and partition constants, interaction with membrane porins and elucidation of their role in the influx, determination of the antimicrobial activity against multidrug-resistant (MDR) clinical isolates, elucidation of the mechanism of action, and toxicity assays are described for FQ metalloantibiotics.
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9
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Study of the solubilisation process of bacterial model membranes induced by DDAO. EUROPEAN PHARMACEUTICAL JOURNAL 2021. [DOI: 10.2478/afpuc-2020-0019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Solubilisation of two bacterial model membranes induced by N,N-dimethyl-1-dodecanamine-N-oxide (DDAO) was studied. The first model membrane consisted of a mixture of palmitoyloleoylphosphatidylethanolamine (POPE) and palmitoyloleoylphosphatidylglycerol (POPG) in a molar ratio 0.6:0.4 mol/mol, and a second model membrane was enriched with tetraoleoylcardiolipin (TOCL) with a composition POPE-POPG-TOCL = 0.67:0.23:0.1 mol/mol/mol. Solubilisation of these model membranes was studied by static light scattering (nephelometry). Effective ratio Re (the amount of DDAO integrated into the bilayer to the amount of lipid) at different steps of the solubilisation process was determined. The molar partition coefficient of DDAO was calculated – in case of the POPE-POPG membrane, Kp = 5,300 ± 400, for the POPE-POPG-TOCL membrane, Kp = 6,500 ± 500.
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10
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Kostelic MM, Zak CK, Jayasekera HS, Marty MT. Assembly of Model Membrane Nanodiscs for Native Mass Spectrometry. Anal Chem 2021; 93:5972-5979. [PMID: 33797873 DOI: 10.1021/acs.analchem.1c00735] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Native mass spectrometry (MS) with nanodiscs is a promising technique for characterizing membrane protein and peptide interactions in lipid bilayers. However, prior studies have used nanodiscs made of only one or two lipids, which lack the complexity of a natural lipid bilayer. To better model specific biological membranes, we developed model mammalian, bacterial, and mitochondrial nanodiscs with up to four different phospholipids. Careful selection of lipids with similar masses that balance the fluidity and curvature enabled these complex nanodiscs to be assembled and resolved with native MS. We then applied this approach to characterize the specificity and incorporation of LL-37, a human antimicrobial peptide, in single-lipid nanodiscs versus model bacterial nanodiscs. Overall, development of these model membrane nanodiscs reveals new insights into the assembly of complex nanodiscs and provides a useful toolkit for studying membrane protein, peptide, and lipid interactions in model biological membranes.
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Affiliation(s)
- Marius M Kostelic
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Ciara K Zak
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Hiruni S Jayasekera
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Michael T Marty
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States.,Bio5 Institute, University of Arizona, Tucson, Arizona 85721, United States
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11
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Perczyk P, Wójcik A, Hachlica N, Wydro P, Broniatowski M. The composition of phospholipid model bacterial membranes determines their endurance to secretory phospholipase A2 attack – The role of cardiolipin. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183239. [DOI: 10.1016/j.bbamem.2020.183239] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 02/12/2020] [Accepted: 02/13/2020] [Indexed: 10/24/2022]
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12
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Shruti SR, Rajasekaran R. Identification of therapeutic peptide scaffold from tritrpticin family for urinary tract infections using in silico techniques. J Biomol Struct Dyn 2019; 38:4407-4417. [DOI: 10.1080/07391102.2019.1680437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- S. R. Shruti
- Department of Biotechnology, School of Biosciences and Technology, VIT (Deemed to Be University), Vellore, India
| | - R. Rajasekaran
- Department of Biotechnology, School of Biosciences and Technology, VIT (Deemed to Be University), Vellore, India
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13
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Lopes SC, Ivanova G, de Castro B, Gameiro P. Revealing cardiolipins influence in the construction of a significant mitochondrial membrane model. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2465-2477. [PMID: 30040925 DOI: 10.1016/j.bbamem.2018.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 07/13/2018] [Accepted: 07/17/2018] [Indexed: 12/24/2022]
Abstract
Cardiolipins are essential for the integrity and the dynamics of the mitochondria membrane, where they exclusively exist in eukaryotes. Changes in cardiolipins membrane levels have been related to several cardiac health disorders. To evaluate cardiolipins impact on membrane properties a physico-chemical study was conducted using steady-state fluorescence anisotropy, dynamic light scattering and Nuclear Magnetic Resonance (1H and 31P NMR). Different binary and ternary mixtures of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine and a natural extract of bovine heart cardiolipin were used as models of mitochondrial membrane. The main transition temperatures, obtained by the first two techniques, revealed to be cardiolipins dependent. Cardiolipins also showed to act as a bidirectional regulator of membrane fluidity. 1H and 31P NMR results revealed that cardiolipins affects the conformation, mobility and structural order of the phospholipid molecules. According to 1H NMR results, cardiolipins disturbs the overall structure and packing order of membrane demonstrated with the decrease of the line broadening and shift of all resonances. The 31P NMR line shape analysis confirmed that, at distinct temperatures, different lipid phases coexist in the systems, and their type and quantitative distribution are cardiolipins dependent. In summary, cardiolipins presence/absence dramatically changes the membrane properties and has a major impact in the construction of a mitochondrial membrane model.
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Affiliation(s)
- S C Lopes
- Requimte, LAQV, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal.
| | - G Ivanova
- Requimte, LAQV, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal.
| | - B de Castro
- Requimte, LAQV, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal.
| | - P Gameiro
- Requimte, LAQV, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal.
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14
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Kooijman EE, Swim LA, Graber ZT, Tyurina YY, Bayır H, Kagan VE. Magic angle spinning 31P NMR spectroscopy reveals two essentially identical ionization states for the cardiolipin phosphates in phospholipid liposomes. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2017; 1859:61-68. [PMID: 27984017 PMCID: PMC5362297 DOI: 10.1016/j.bbamem.2016.10.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 10/20/2016] [Accepted: 10/25/2016] [Indexed: 01/04/2023]
Abstract
Specific membrane lipid composition is crucial for optimized structural and functional organization of biological membranes. Cardiolipin is a unique phospholipid and important component of the inner mitochondrial membrane. It is involved in energy metabolism, inner mitochondrial membrane transport, regulation of multiple metabolic reactions and apoptotic cell death. The physico-chemical properties of cardiolipin have been studied extensively but despite all these efforts there is still lingering controversy regarding the ionization of the two phosphate groups of cardiolipin. Results obtained in the 1990s and early 2000s suggested that cardiolipin has two disparate pKa values where one of the protons was proposed to be stabilized by an intramolecular hydrogen bond. This has led to extensive speculations on the roles of these two putative ionization states of cardiolipin in mitochondria. More recently the notion of two pKa values has been challenged and rejected by several groups. These studies relied on external measurements of proton adsorption or electrophoretic mobility of membranes but did not take into account the low pH phase behavior and chemical stability of cardiolipin. Here we used 31P NMR to show that in the physiologically relevant membrane phospholipid environment, cardiolipin carries two negative charges at physiological pH. We additionally demonstrate the pH dependent phase behavior and chemical stability of cardiolipin containing membranes.
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Affiliation(s)
- E E Kooijman
- Department of Biological Sciences, Kent State University, Kent, OH, United States.
| | - L A Swim
- Department of Biological Sciences, Kent State University, Kent, OH, United States
| | - Z T Graber
- Department of Chemistry and Biochemistry, Kent State University, Kent, OH, United States
| | - Y Y Tyurina
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA, United States
| | - H Bayır
- Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA, United States
| | - V E Kagan
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA, United States
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15
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Lind TK, Wacklin H, Schiller J, Moulin M, Haertlein M, Pomorski TG, Cárdenas M. Formation and Characterization of Supported Lipid Bilayers Composed of Hydrogenated and Deuterated Escherichia coli Lipids. PLoS One 2015; 10:e0144671. [PMID: 26658241 PMCID: PMC4676697 DOI: 10.1371/journal.pone.0144671] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 11/20/2015] [Indexed: 01/26/2023] Open
Abstract
Supported lipid bilayers are widely used for sensing and deciphering biomolecular interactions with model cell membranes. In this paper, we present a method to form supported lipid bilayers from total lipid extracts of Escherichia coli by vesicle fusion. We show the validity of this method for different types of extracts including those from deuterated biomass using a combination of complementary surface sensitive techniques; quartz crystal microbalance, neutron reflection and atomic force microscopy. We find that the head group composition of the deuterated and the hydrogenated lipid extracts is similar (approximately 75% phosphatidylethanolamine, 13% phosphatidylglycerol and 12% cardiolipin) and that both samples can be used to reconstitute high-coverage supported lipid bilayers with a total thickness of 41 ± 3 Å, common for fluid membranes. The formation of supported lipid bilayers composed of natural extracts of Escherichia coli allow for following biomolecular interactions, thus advancing the field towards bacterial-specific membrane biomimics.
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Affiliation(s)
- Tania Kjellerup Lind
- Nano-Science Center and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
- European Spallation Source ESS AB, Lund, Sweden
| | - Hanna Wacklin
- Nano-Science Center and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
- European Spallation Source ESS AB, Lund, Sweden
| | - Jürgen Schiller
- Institute of Medical Physics and Biophysics, Faculty of Medicine, University of Leipzig, Leipzig, Germany
| | - Martine Moulin
- Institut Laue-Langevin, Life Science Group, Grenoble, France
| | | | - Thomas Günther Pomorski
- Centre for Membrane Pumps in Cells and Disease—PUMPKIN, Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Marité Cárdenas
- Nano-Science Center and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
- Malmoe University, Department of Biomedical Sciences, Health & Society, 20500 Malmoe, Sweden
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16
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Bonucci A, Caldaroni E, Balducci E, Pogni R. A Spectroscopic Study of the Aggregation State of the Human Antimicrobial Peptide LL-37 in Bacterial versus Host Cell Model Membranes. Biochemistry 2015; 54:6760-8. [PMID: 26502164 DOI: 10.1021/acs.biochem.5b00813] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The LL-37 antimicrobial peptide is the only cathelicidin peptide found in humans that has antimicrobial and immunomodulatory properties. Because it exerts also chemotactic and angiogenetic activity, LL-37 is involved in promoting wound healing, reducing inflammation, and strengthening the host immune response. The key to the effectiveness of antimicrobial peptides (AMPs) lies in the different compositions of bacterial versus host cell membranes. In this context, antimicrobial peptide LL-37 and two variants were studied in the presence of model membranes with different lipid compositions and charges. The investigation was performed using an experimental strategy that combines the site-directed spin labeling-electron paramagnetic resonance technique with circular dichroism and fluorescence emission spectroscopies. LL-37 interacts with negatively charged membranes forming a stable aggregate, which can likely produce toroidal pores until the amount of bound peptide exceeds a critical concentration. At the same time, we have clearly detected an aggregate with a higher oligomeric degree for interaction of LL-37 with neutral membranes. These data confirm the absence of cell selectivity of the peptide and a more complex role in stimulating host cells.
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Affiliation(s)
- Alessio Bonucci
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena , 53100 Siena, Italy
| | - Elena Caldaroni
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena , 53100 Siena, Italy
| | - Enrico Balducci
- School of Biosciences and Veterinary Medicine, University of Camerino , 62032 Camerino, Italy
| | - Rebecca Pogni
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena , 53100 Siena, Italy
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17
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Lopes SC, Ferreira M, Sousa CF, Gameiro P. A fast way to track functional OmpF reconstitution in liposomes: Escherichia coli total lipid extract. Anal Biochem 2015; 479:54-9. [PMID: 25841673 DOI: 10.1016/j.ab.2015.03.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 03/24/2015] [Accepted: 03/25/2015] [Indexed: 10/23/2022]
Abstract
A major requirement to perform structural studies with membrane proteins is to define efficient reconstitution protocols that ensure a high incorporation degree and protein directionality and topology that mimics its in vivo conditions. For this kind of studies, protein reconstitution in membrane systems via a detergent-mediated pathway is usually successfully adopted because detergents are generally used in the initial isolation and purification of membrane proteins. This study reports OmpF reconstitution in preformed Escherichia coli liposomes followed by detection of its insertion by analyzing modifications on membrane structure by two different techniques: steady-state fluorescence anisotropy and dynamic light scattering. Another important issue is protein directionality. For OmpF, it is known that interaction with polyamines promotes channel blockage. In this work, the spermine-OmpF interaction was evaluated using surface plasmon resonance, and protein directionality was confirmed.
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Affiliation(s)
- S C Lopes
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
| | - M Ferreira
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
| | - C F Sousa
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
| | - P Gameiro
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal.
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Taylor GJ, Sarles SA. Heating-enabled formation of droplet interface bilayers using Escherichia coli total lipid extract. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 31:325-37. [PMID: 25514167 DOI: 10.1021/la503471m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Droplet interface bilayers (DIBs) serve as a convenient platform to study interactions between synthetic lipid membranes and proteins. However, a majority of DIBs have been assembled using a single lipid type, diphytanoylphosphatidylcholine (DPhPC). The work described herein establishes a new method to assemble DIBs using total lipid extract from Escherichia coli (eTLE); it is found that incubating oil-submerged aqueous droplets containing eTLE liposomes at a temperature above the gel-fluid phase transition temperature (Tg) promotes monolayer self-assembly that does not occur below Tg. Once monolayers are properly assembled via heating, droplets can be directly connected or cooled below Tg and then connected to initiate bilayer formation. This outcome contrasts immediate droplet coalescence observed upon contact between nonheated eTLE-infused droplets. Specific capacitance measurements confirm that the interface between droplets containing eTLE lipids is a lipid bilayer with thickness of 29.6 Å at 25 °C in hexadecane. We observe that bilayers formed from eTLE or DPhPC survive cooling and heating between 25 and 50 °C and demonstrate gigaohm (GΩ) membrane resistances at all temperatures tested. Additionally, we study the insertion of alamethicin peptides into both eTLE and DPhPC membranes to understand how lipid composition, temperature, and membrane phase influence ion channel formation. Like in DPhPC bilayers, alamethicin peptides in eTLE exhibit discrete, voltage-dependent gating characterized by multiple open channel conductance levels, though at significantly lower applied voltages. Cyclic voltammetry measurements of macroscopic channel currents confirm that the voltage-dependent conductance of alamethicin channels in eTLE bilayers occurs at lower voltages than in DPhPC bilayers at equivalent peptide concentrations. This result suggests that eTLE membranes, via composition, fluidity, or the presence of subdomains, offer an environment that enhances alamethicin insertion. For both membrane compositions, increasing temperature reduces the lifetimes of single channel gating events and increases the voltage required to cause an exponential increase in channel current. However, the fact that alamethicin insertion in eTLE exhibits significantly greater sensitivity to temperature changes through its Tg suggests that membrane phase plays an important role in channel formation. These effects are much less severe in DPhPC, where heating from 25 to 50 °C does not induce a phase change. The described technique for heating-assisted monolayer formation permits the use of other high transition temperature lipids in aqueous droplets for DIB formation, thereby increasing the types of lipids that can be considered for assembling model membranes.
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Affiliation(s)
- Graham J Taylor
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States
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19
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Ciprofloxacin Metalloantibiotic: An Effective Antibiotic with an Influx Route Strongly Dependent on Lipid Interaction? J Membr Biol 2014; 248:125-36. [DOI: 10.1007/s00232-014-9749-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 10/29/2014] [Indexed: 12/01/2022]
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20
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Human neutrophil peptide 1 variants bearing arginine modified cationic side chains: effects on membrane partitioning. Biophys Chem 2014; 190-191:32-40. [PMID: 24820901 DOI: 10.1016/j.bpc.2014.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 04/14/2014] [Accepted: 04/15/2014] [Indexed: 11/22/2022]
Abstract
α-Defensins (e.g. human neutrophil peptides, HNPs) have a broad spectrum bactericidal activity contributing to human innate immunity. The positive charge of amino acid side chains is responsible for the first interaction of cationic antimicrobial peptides with negatively charged bacterial membranes. α-Defensins contain a high content of Arg residues compared to Lys. In this paper, different peptide analogs including substitution of Arg-14 respectively with N(G)-N(G')-asymmetric dimethyl-l-arginine (ADMA), N(G)-N(G')-symmetric dimethyl-l-arginine (SDMA) and Lys (R14K and R15KR14KR15K) variants have been studied to test the role of Arg guanidino group and the localized cationic charge of Lys for interaction with lipid membranes. Our findings show that all the variants have a decreased disruptive activity against the bilayer. The methylated analogs show a reduction in membrane partitioning due to the lack of their ability to form hydrogen bonds. Comparison with the native HNP-1 peptide has been discussed.
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21
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Bonucci A, Balducci E, Pistolesi S, Pogni R. The defensin–lipid interaction: Insights on the binding states of the human antimicrobial peptide HNP-1 to model bacterial membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:758-64. [DOI: 10.1016/j.bbamem.2012.11.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 10/08/2012] [Accepted: 11/08/2012] [Indexed: 01/13/2023]
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22
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Palermo G, Campomanes P, Neri M, Piomelli D, Cavalli A, Rothlisberger U, De Vivo M. Wagging the Tail: Essential Role of Substrate Flexibility in FAAH Catalysis. J Chem Theory Comput 2013; 9:1202-13. [PMID: 26588763 DOI: 10.1021/ct300611q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The serine hydrolase, fatty acid amide hydrolase (FAAH), is responsible for the intracellular degradation of anandamide and other bioactive fatty acid ethanolamides involved in the regulation of pain, inflammation, and other pathophysiological processes. The catalytic site of FAAH is composed of multiple cavities with mixed hydrophobic and hydrophilic properties, the role of which remains incompletely understood. Anandamide is thought to enter the active site through a "membrane-access" (MA) channel and position its flexible fatty acyl chain in a highly hydrophobic "acyl chain-binding" (AB) cavity to allow for hydrolysis to occur. Using microsecond molecular dynamics (MD) simulations of FAAH embedded in a realistic membrane/water environment, we show now that anandamide may not lock itself into the AB cavity but may rather assume catalytically significant conformations required for hydrolysis by moving its flexible arachidonoyl tail between the MA and AB cavities. This process is regulated by a phenylalanine residue (Phe432) located at the boundary between the two cavities, which may act as a "dynamic paddle." The results identify structural flexibility as a key determinant by which FAAH recognizes its primary lipid substrate.
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Affiliation(s)
- Giulia Palermo
- Department of Drug Discovery and Development, Italian Institute of Technology, Via Morego 30, 16163 Genova, Italy.,Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Pablo Campomanes
- Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Marilisa Neri
- Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Daniele Piomelli
- Department of Drug Discovery and Development, Italian Institute of Technology, Via Morego 30, 16163 Genova, Italy.,Department of Anatomy and Neurobiology, University of California, Irvine, California 92697, United States
| | - Andrea Cavalli
- Department of Drug Discovery and Development, Italian Institute of Technology, Via Morego 30, 16163 Genova, Italy.,Department of Pharmaceutical Sciences, University of Bologna, via Belmeloro 6, I-40126 Bologna, Italy
| | - Ursula Rothlisberger
- Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Marco De Vivo
- Department of Drug Discovery and Development, Italian Institute of Technology, Via Morego 30, 16163 Genova, Italy
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23
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Pallicer JM, Krämer SD. Evaluation of fluorescence anisotropy to assess drug–lipid membrane partitioning. J Pharm Biomed Anal 2012; 71:219-27. [DOI: 10.1016/j.jpba.2012.08.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Revised: 08/05/2012] [Accepted: 08/08/2012] [Indexed: 01/17/2023]
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24
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Lopes SC, Ribeiro C, Gameiro P. A New Approach to Counteract Bacteria Resistance: A Comparative Study Between Moxifloxacin and a New Moxifloxacin Derivative in Different Model Systems of Bacterial Membrane. Chem Biol Drug Des 2012; 81:265-74. [DOI: 10.1111/cbdd.12071] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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25
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Lopes SC, Neves CS, Eaton P, Gameiro P. Improved model systems for bacterial membranes from differing species: Theimportance of varying composition in PE/PG/cardiolipin ternary mixtures. Mol Membr Biol 2012; 29:207-17. [DOI: 10.3109/09687688.2012.700491] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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26
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Das S, Powe AM, Baker GA, Valle B, El-Zahab B, Sintim HO, Lowry M, Fakayode SO, McCarroll ME, Patonay G, Li M, Strongin RM, Geng ML, Warner IM. Molecular Fluorescence, Phosphorescence, and Chemiluminescence Spectrometry. Anal Chem 2011; 84:597-625. [DOI: 10.1021/ac202904n] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Susmita Das
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Aleeta M. Powe
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40208, United States
| | - Gary A. Baker
- Department of Chemistry, University of Missouri−Columbia, Columbia, Missouri 65211-7600, United States
| | - Bertha Valle
- Department of Chemistry, Texas Southern University, Houston, Texas 77004, United States
| | - Bilal El-Zahab
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Herman O. Sintim
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Mark Lowry
- Department of Chemistry, Portland State University, Portland, Oregon 97207, United States
| | - Sayo O. Fakayode
- Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, United States
| | - Matthew E. McCarroll
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901-4409, United States
| | - Gabor Patonay
- Department of Chemistry, Georgia State University, Atlanta, Georgia 30302-4098, United States
| | - Min Li
- Process Development Center, Albemarle Corporation, Baton Rouge, Louisiana 70805, United States
| | - Robert M. Strongin
- Department of Chemistry, Portland State University, Portland, Oregon 97207, United States
| | - Maxwell L. Geng
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Isiah M. Warner
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Ribeiro C, Lopes SC, Gameiro P. New Insights into the Translocation Route of Enrofloxacin and Its Metalloantibiotics. J Membr Biol 2011; 241:117-25. [DOI: 10.1007/s00232-011-9368-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Accepted: 04/27/2011] [Indexed: 01/16/2023]
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28
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Cheng JTJ, Hale JD, Elliott M, Hancock REW, Straus SK. The importance of bacterial membrane composition in the structure and function of aurein 2.2 and selected variants. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1808:622-33. [PMID: 21144817 DOI: 10.1016/j.bbamem.2010.11.025] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Revised: 10/08/2010] [Accepted: 11/20/2010] [Indexed: 11/29/2022]
Abstract
For cationic antimicrobial peptides to become useful therapeutic agents, it is important to understand their mechanism of action. To obtain high resolution data, this involves studying the structure and membrane interaction of these peptides in tractable model bacterial membranes rather than directly utilizing more complex bacterial surfaces. A number of lipid mixtures have been used as bacterial mimetics, including a range of lipid headgroups, and different ratios of neutral to negatively charged headgroups. Here we examine how the structure and membrane interaction of aurein 2.2 and some of its variants depend on the choice of lipids, and how these models correlate with activity data in intact bacteria (MICs, membrane depolarization). Specifically, we investigated the structure and membrane interaction of aurein 2.2 and aurein 2.3 in 1:1 cardiolipin/1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (CL/POPG) (mol/mol), as an alternative to 1:1 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine(POPC)/POPG and a potential model for Gram positive bacteria such as S. aureus. The structure and membrane interaction of aurein 2.2, aurein 2.3, and five variants of aurein 2.2 were also investigated in 1:1 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine (POPE)/POPG (mol/mol) lipids as a possible model for other Gram positive bacteria, such as Bacillus cereus. Solution circular dichroism (CD) results demonstrated that the aurein peptides adopted α-helical structure in all lipid membranes examined, but demonstrated a greater helical content in the presence of POPE/POPG membranes. Oriented CD and ³¹P NMR results showed that the aurein peptides had similar membrane insertion profiles and headgroup disordering effects on POPC/POPG and CL/POPG bilayers, but demonstrated reduced membrane insertion and decreased headgroup disordering on mixing with POPE/POPG bilayers at low peptide concentrations. Since the aurein peptides behaved very differently in POPE/POPG membrane, minimal inhibitory concentrations (MICs) of the aurein peptides in B. cereus strain C737 were determined. The MIC results indicated that all aurein peptides are significantly less active against B. cereus than against S. aureus and S. epidermidis. Overall, the data suggest that it is important to use a relevant model for bacterial membranes to gain insight into the mode of action of a given antimicrobial peptide in specific bacteria.
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Affiliation(s)
- John T J Cheng
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T1Z1, Canada
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