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Henderson RDE, Mei N, Xu Y, Gaikwad R, Wettig S, Leonenko Z. Nanoscale Structure of Lipid-Gemini Surfactant Mixed Monolayers Resolved with AFM and KPFM Microscopy. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:572. [PMID: 38607107 PMCID: PMC11013119 DOI: 10.3390/nano14070572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 03/18/2024] [Accepted: 03/20/2024] [Indexed: 04/13/2024]
Abstract
Drug delivery vehicles composed of lipids and gemini surfactants (GS) are promising in gene therapy. Tuning the composition and properties of the delivery vehicle is important for the efficient load and delivery of DNA fragments (genes). In this paper, we studied novel gene delivery systems composed of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), 1,2-dipalmitoyl-sn-3-phosphocholine (DPPC), and GS of the type N,N-bis(dimethylalkyl)-α,ω-alkanediammonium dibromide at different ratios. The nanoscale properties of the mixed DOPC-DPPC-GS monolayers on the surface of the gene delivery system were studied using atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). We demonstrate that lipid-GS mixed monolayers result in the formation of nanoscale domains that vary in size, height, and electrical surface potential. We show that the presence of GS can impart significant changes to the domain topography and electrical surface potential compared to monolayers composed of lipids alone.
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Affiliation(s)
- Robert D. E. Henderson
- Department of Physics & Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada; (R.D.E.H.); (N.M.); (Y.X.)
- Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Nanqin Mei
- Department of Physics & Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada; (R.D.E.H.); (N.M.); (Y.X.)
- Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Yue Xu
- Department of Physics & Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada; (R.D.E.H.); (N.M.); (Y.X.)
| | - Ravi Gaikwad
- Department of Physics & Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada; (R.D.E.H.); (N.M.); (Y.X.)
| | - Shawn Wettig
- Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
- School of Pharmacy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Zoya Leonenko
- Department of Physics & Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada; (R.D.E.H.); (N.M.); (Y.X.)
- Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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2
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Jansen G, Schulz S, van der Vight F. Effects of Dispersion and Charge‐Transfer Interactions on Structures of Heavy Chalcogenide Compounds: A Quantum Chemical Case Study for (Et2Bi)2Te. Chempluschem 2022; 87:e202100487. [DOI: 10.1002/cplu.202100487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 02/03/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Georg Jansen
- Universitat Duisburg-Essen Chemistry Universitätsstr. 5-7 45141 Essen GERMANY
| | - Stephan Schulz
- University of Duisburg-Essen: Universitat Duisburg-Essen Chemistry Universitätsstr. 5-7 45141 Essen GERMANY
| | - Felix van der Vight
- University of Duisburg-Essen: Universitat Duisburg-Essen Chemistry Universitätsstr. 5-7 45141 Essen GERMANY
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3
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Li S, Wu L, Zhu M, Cheng X, Jiang X. Effect of dipole potential on the orientation of Voltage-gated Alamethicin peptides regulated by chaotropic anions. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2021.115880] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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4
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Bohinc K, Špadina M, Reščič J, Shimokawa N, Spada S. Influence of Charge Lipid Head Group Structures on Electric Double Layer Properties. J Chem Theory Comput 2021; 18:448-460. [PMID: 34937343 PMCID: PMC8757465 DOI: 10.1021/acs.jctc.1c00800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
In this study we
derived a model for a multicomponent lipid monolayer
in contact with an aqueous solution by means of a generalized classical
density functional theory and Monte Carlo simulations. Some of the
important biological lipid systems were studied as monolayers composed
of head groups with different shapes and charge distributions. Starting
from the free energy of the system, which includes the electrostatic
interactions, additional internal degrees of freedom are included
as positional and orientational entropic contributions to the free
energy functional. The calculus of variation was used to derive Euler–Lagrange
equations, which were solved numerically by the finite element method.
The theory and Monte Carlo simulations predict that there are mainly
two distinct regions of the electric double layer: (1) the interfacial
region, with thickness less than or equal to the length of the fully
stretched conformation of the lipid head group, and (2) the outside
region, which follows the usual screening of the interface. In the
interfacial region, the electric double layer is strongly perturbed,
and electrostatic profiles and ion distributions have functionality
distinct to classical mean-field theories. Based purely on Coulomb
interactions, the theory suggests that the dominant effect on the
lipid head group conformation is from the charge density of the interface
and the structured lipid mole fraction in the monolayer, rather than
the salt concentration in the system.
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Affiliation(s)
- Klemen Bohinc
- Faculty of Health Sciences, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Mario Špadina
- Faculty of Health Sciences, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Jurij Reščič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Naofumi Shimokawa
- Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Simone Spada
- National Institute of Oceanography and Applied Geophysics - OGS, 34010 Trieste, Italy
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5
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Shen H, Wu Z, Zou X. Interfacial Water Structure at Zwitterionic Membrane/Water Interface: The Importance of Interactions between Water and Lipid Carbonyl Groups. ACS OMEGA 2020; 5:18080-18090. [PMID: 32743182 PMCID: PMC7391366 DOI: 10.1021/acsomega.0c01633] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 07/07/2020] [Indexed: 06/11/2023]
Abstract
In this work, atomistic molecular dynamics (MD) simulations of palmitoyl-oleoyl-phosphatidylcholine (POPC) bilayer were carried out to investigate the effect of water models on membrane dipole potential, which is primarily associated with the preferential orientation of molecular dipoles at the membrane-water interface. We discovered that the overestimation of the dipole potential by the TIPS3P water model can be effectively reduced by the TIP4P water model. On the one hand, the TIP4P water model decreases the negative contribution of lipid to the dipole potential through influencing the orientation of lipid headgroups. On the other hand, the TIP4P water model reduces the positive contribution of water to the dipole potential by increasing the preference of H-down orientation (the water dipole orients toward the bilayer center). Interestingly, the TIP4P water model affects the orientation of interfacial water molecules more obviously than that of lipid headgroups, leading to the decrease in the dipole potential. Furthermore, the MD results revealed that the water close to the positively charged choline (namely, N-associated water) prefers the H-down orientation while the water around the negatively charged phosphate (namely, P-associated water) favors the H-up orientation, in support of recent experimental and MD studies. However, interfacial water molecules are more strongly influenced by the phosphate groups than by the choline groups, resulting in the net H-up orientation (the water dipole orients toward the bilayer center) in the region of lipid headgroups. In addition, it is intriguing that the preference of H-up orientation decreases when water molecules penetrate more deeply into the lipid bilayer. This is attributed to the counteracting effect of lipid carbonyl groups, and the effect varies with the lipid chains (oleoyl and palmitoyl chains), suggesting the important role of lipid carbonyl groups.
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Affiliation(s)
- Hujun Shen
- Guizhou
Provincial Key Laboratory of Computational Nano-Material Science,
Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced
Manufacturing Technology, Guizhou Education
University, No. 115,
Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
- Guizhou
University of Finance and Economics, School of Information, University City of Huaxi District, Guiyang, Guizhou 550025, P. R. China
| | - Zhenhua Wu
- Guizhou
University of Finance and Economics, School of Information, University City of Huaxi District, Guiyang, Guizhou 550025, P. R. China
| | - Xuefeng Zou
- Guizhou
Provincial Key Laboratory of Computational Nano-Material Science,
Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced
Manufacturing Technology, Guizhou Education
University, No. 115,
Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
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6
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Ma T, Feng X, Ohori T, Miyata R, Tadaki D, Yamaura D, Deguchi T, Komiya M, Kanomata K, Hirose F, Niwano M, Hirano-Iwata A. Modulation of Photoinduced Transmembrane Currents in a Fullerene-Doped Freestanding Lipid Bilayer by a Lateral Bias. ACS OMEGA 2019; 4:18299-18303. [PMID: 31720530 PMCID: PMC6844088 DOI: 10.1021/acsomega.9b02336] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 10/10/2019] [Indexed: 06/01/2023]
Abstract
We report on a novel lipid bilayer system, in which a lateral bias can be applied in addition to a conventional transmembrane voltage. Freestanding bilayer lipid membranes (BLMs) doped with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were formed in a microaperture, around which metal electrodes were deposited. Using this system, it was possible to modulate and amplify photoinduced transmembrane currents by applying a lateral bias along the BLM. The results indicate that the microfabricated Si chip with embedded electrodes is a promising platform for the formation of transistor-like devices based on PCBM-doped BLMs and have potential for use in a wide variety of nanohybrid devices.
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Affiliation(s)
- Teng Ma
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Xingyao Feng
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Takeshi Ohori
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Ryusuke Miyata
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Daisuke Tadaki
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Daichi Yamaura
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Takafumi Deguchi
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Maki Komiya
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
| | - Kensaku Kanomata
- Graduate
School of Science and Engineering, Yamagata
University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
| | - Fumihiko Hirose
- Graduate
School of Science and Engineering, Yamagata
University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
| | - Michio Niwano
- Kansei
Fukushi Research Institute, Tohoku Fukushi
University, 6-149-1 Kunimi-ga-oka, Aoba-ku, Sendai, Miyagi 989-3201, Japan
| | - Ayumi Hirano-Iwata
- Advanced
Institute for Materials Research (WPI-AIMR) and Research Institute
of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
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7
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Shen H, Wu Z, Zhao K, Yang H, Deng M, Wen S. Effect of Cholesterol and 6-Ketocholestanol on Membrane Dipole Potential and Sterol Flip-Flop Motion in Bilayer Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11232-11241. [PMID: 31373497 DOI: 10.1021/acs.langmuir.9b01802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A variety of experimental and theoretical approaches have been employed to investigate the sterol flip-flop motion in lipid bilayer membranes. However, the sterol effect on the dipole potential of lipid bilayer membranes is less well studied and the influence of dipole potential on sterol flip-flop motion in lipid bilayer membranes is less well understood. In our previous works, we have demonstrated the performance of our coarse-grained (CG) model in the computation of the dipole potential. In this work, five 30 μs CG simulations of dimyristoylphosphatidylcholine (DMPC) bilayers were carried out at different sterol concentrations (in a range from 10 to 50% mole fraction). Then, a comparison was made between the effects of cholesterol (CHOL) and 6-ketocholestanol (6-KC) on the dipole potential of DMPC lipid bilayers as well as the sterol flip-flop motion. Our CG simulations show that the membrane dipole potential is impacted more significantly by 6-KC than by CHOL. This finding is consistent with recent experimental studies. Meanwhile, our work suggests that the sterol-sterol interactions (in particular, electrostatic interactions) should be critical to the formation of sterol-sterol clusters, which would hinder the sterol flip-flop motion inside the lipid bilayers. This is in support of the recent experimental study on the sterol transportation in lipid bilayer membranes.
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Affiliation(s)
- Hujun Shen
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology , Guizhou Education University , No. 115, Gaoxin Road , Guiyang , Guizhou 550018 , P. R. China
- School of Information , Guizhou University of Finance and Economics , University City of Huaxi District, Guiyang , Guizhou 550025 , P. R. China
| | - Zhenhua Wu
- School of Information , Guizhou University of Finance and Economics , University City of Huaxi District, Guiyang , Guizhou 550025 , P. R. China
| | - Kun Zhao
- School of Information , Guizhou University of Finance and Economics , University City of Huaxi District, Guiyang , Guizhou 550025 , P. R. China
| | - Hengxiu Yang
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology , Guizhou Education University , No. 115, Gaoxin Road , Guiyang , Guizhou 550018 , P. R. China
| | - Mingsen Deng
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology , Guizhou Education University , No. 115, Gaoxin Road , Guiyang , Guizhou 550018 , P. R. China
- School of Information , Guizhou University of Finance and Economics , University City of Huaxi District, Guiyang , Guizhou 550025 , P. R. China
| | - Shuiguo Wen
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology , Guizhou Education University , No. 115, Gaoxin Road , Guiyang , Guizhou 550018 , P. R. China
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8
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Mangiarotti A, Galassi VV, Puentes EN, Oliveira RG, Del Pópolo MG, Wilke N. Hopanoids Like Sterols Form Compact but Fluid Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9848-9857. [PMID: 31268719 DOI: 10.1021/acs.langmuir.9b01641] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hopanoids are pentacyclic molecules present in membranes from some bacteria, recently proposed as sterol surrogates in these organisms. Diplopterol is an abundant hopanoid that, similar to sterols, does not self-aggregate in lamellar structures when pure, but forms monolayers at the air-water interface. Here, we analyze the interfacial behavior of pure diplopterol and compare it with sterols from different organisms: cholesterol from mammals, ergosterol from fungi, and stigmasterol from plants. We prepared Langmuir monolayers of the compounds and studied their surface properties using different experimental approaches and molecular dynamics simulations. Our results indicate that the films formed by diplopterol, despite being compact with low mean molecular areas, high surface potentials, and high refractive index, depict shear viscosity values similar to that for fluid films. Altogether, our results reveal that hopanoids have similar interfacial behavior than that of sterols, and thus they may have the capacity of modulating bacterial membrane properties in a similar way sterols do in eukaryotes.
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Affiliation(s)
| | - Vanesa V Galassi
- CONICET y Facultad de Ciencias Exactas y Naturales , Universidad Nacional de Cuyo , Padre Jorge Contreras 1300 , Parque General San Martín, M5502JMA Mendoza , Argentina
| | | | | | - Mario G Del Pópolo
- CONICET y Facultad de Ciencias Exactas y Naturales , Universidad Nacional de Cuyo , Padre Jorge Contreras 1300 , Parque General San Martín, M5502JMA Mendoza , Argentina
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9
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Tesei G, Vazdar M, Lund M. Coarse-grained model of titrating peptides interacting with lipid bilayers. J Chem Phys 2018; 149:244108. [PMID: 30599743 DOI: 10.1063/1.5058234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular-level computer simulations of peptide aggregation, translocation, and protonation at and in biomembranes are impeded by the large time and length scales involved. We present a computationally efficient, coarse-grained, and solvent-free model for the interaction between lipid bilayers and peptides. The model combines an accurate description of mechanical membrane properties with a new granular representation of the dielectric mismatch between lipids and the aqueous phase. All-atom force fields can be easily mapped onto the coarse-grained model, and parameters for coarse-grained monopeptides accurately extrapolate to membrane permeation free energies for the corresponding dipeptides and tripeptides. Acid-base equilibria of titratable amino acid residues are further studied using a constant-pH ensemble, capturing protonation state changes upon membrane translocation. Important differences between histidine, lysine, and arginine are observed, which are in good agreement with experimental observations.
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Affiliation(s)
- Giulio Tesei
- Division of Theoretical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
| | - Mario Vazdar
- Division of Organic Chemistry and Biochemistry, Rudjer Bošković Institute, P.O. Box 180, HR-10002 Zagreb, Croatia
| | - Mikael Lund
- Division of Theoretical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
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10
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Huang B, Tan Z, Bohinc K, Zhang S. Interaction between nanoparticles and charged phospholipid membranes. Phys Chem Chem Phys 2018; 20:29249-29263. [PMID: 30427341 DOI: 10.1039/c8cp04740e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Charged lipids in cell membranes and subcellular organelles are arranged in the form of a bilayer with the hydrocarbon tails sequestered away from the water and the polar head groups exposed to the aqueous environment. Most of them bear net negative charges leading to the negatively charged cell membranes. Charged lipid-lipid and lipid-protein interactions are generally dynamic and heavily depend on their local molecular concentrations. To examine the electrostatic properties of charged lipid layers in contact with an electrolyte solution, we incorporate the single chain mean field theory with Poisson-Boltzmann theory to explore the equilibrium structure of charged phospholipid membranes. Using the three bead coarse-grained model we reproduced the essential equilibrium properties of the charged phospholipid bilayer. We also investigate the influence of the mobile ions on the thickness of the layer, the area per lipid (APL), and the electrostatic potential of the membrane. Then we investigate the attraction-repulsion property of two charged nanoparticles which are stuck on the charged lipid molecules surrounded with mobile ions. After that we simulated the interaction between the Pleckstrin homology domain (PH domain) of Akt and the cytoplasmic membrane. Taking into account the electrostatic interaction, we observe the structure changes of the membrane at different concentrations of mobile ions in its equilibrium state. Also we discuss the influence of mobile ions on the size of the pore opened in the membrane by the charged protein. Such an observation may shed light on the activation of oncogenic Akt (or protein kinase B) around the membrane at the molecular level.
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Affiliation(s)
- Beibei Huang
- Intelligent Molecular Discovery Laboratory, Department of Experimental Therapeutics, The University of Texas M. D. Anderson Cancer Center, 1901 East Road, Houston, TX 77054, USA.
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11
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Dreier LB, Bernhard C, Gonella G, Backus EHG, Bonn M. Surface Potential of a Planar Charged Lipid-Water Interface. What Do Vibrating Plate Methods, Second Harmonic and Sum Frequency Measure? J Phys Chem Lett 2018; 9:5685-5691. [PMID: 30212219 DOI: 10.1021/acs.jpclett.8b02093] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The interfacial electrical potential is an important parameter influencing, for instance, electrochemical reactions and biomolecular interactions at membranes. A deeper understanding of different methods that measure quantities related to the surface potential is thus of great scientific and technological relevance. We use lipid monolayers with varying charge density and thoroughly compare the results of surface potential measurements performed with the vibrating plate capacitor method and second harmonic generation spectroscopy. The two techniques provide very different results as a function of surface charge. Using the molecular information on lipid alkyl chain, lipid headgroup, and interfacial water provided by sum frequency generation spectroscopy, we disentangle the different contributions to the surface potential measured by the different techniques. Our results show that the two distinct approaches are dominated by different molecular moieties and effects. While the shape of the SPOT method response as a function of charge density is dominated by the lipid carbonyl groups, the SHG results contain contributions from the interfacial water molecules, the lipids and hyper-Rayleigh scattering.
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Affiliation(s)
- L B Dreier
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
- Graduate School Materials Science in Mainz , Staudingerweg 9 , 55128 Mainz , Germany
| | - C Bernhard
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - G Gonella
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - E H G Backus
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - M Bonn
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
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12
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Shen H, Wu Z, Deng M, Wen S, Gao C, Li S, Wu X. Molecular Dynamics Simulations of Ether- and Ester-Linked Phospholipid Bilayers: A Comparative Study of Water Models. J Phys Chem B 2018; 122:9399-9408. [DOI: 10.1021/acs.jpcb.8b06726] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Hujun Shen
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
- School of Information, Guizhou University of Finance and Economics, University City of Huaxi District, Guiyang, Guizhou 550025, P. R. China
| | - Zhenhua Wu
- School of Information, Guizhou University of Finance and Economics, University City of Huaxi District, Guiyang, Guizhou 550025, P. R. China
| | - Mingsen Deng
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
- School of Information, Guizhou University of Finance and Economics, University City of Huaxi District, Guiyang, Guizhou 550025, P. R. China
| | - Shuiguo Wen
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Chenggui Gao
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Shixiong Li
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Xupu Wu
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
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13
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Hollmann A, Martinez M, Maturana P, Semorile LC, Maffia PC. Antimicrobial Peptides: Interaction With Model and Biological Membranes and Synergism With Chemical Antibiotics. Front Chem 2018; 6:204. [PMID: 29922648 PMCID: PMC5996110 DOI: 10.3389/fchem.2018.00204] [Citation(s) in RCA: 185] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 05/17/2018] [Indexed: 01/10/2023] Open
Abstract
Antimicrobial peptides (AMPs) are promising novel antibiotics since they have shown antimicrobial activity against a wide range of bacterial species, including multiresistant bacteria; however, toxicity is the major barrier to convert antimicrobial peptides into active drugs. A profound and proper understanding of the complex interactions between these peptides and biological membranes using biophysical tools and model membranes seems to be a key factor in the race to develop a suitable antimicrobial peptide therapy for clinical use. In the search for such therapy, different combined approaches with conventional antibiotics have been evaluated in recent years and demonstrated to improve the therapeutic potential of AMPs. Some of these approaches have revealed promising additive or synergistic activity between AMPs and chemical antibiotics. This review will give an insight into the possibilities that physicochemical tools can give in the AMPs research and also address the state of the art on the current promising combined therapies between AMPs and conventional antibiotics, which appear to be a plausible future opportunity for AMPs treatment.
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Affiliation(s)
- Axel Hollmann
- Laboratory of Molecular Microbiology, Institute of Basic and Applied Microbiology, National University of Quilmes, Bernal, Argentina.,Centro de Investigación en Biofísica Aplicada y Alimentos, Consejo Nacional de Investigaciones Científicas y Técnicas and National University of Santiago del Estero, Santiago del Estero, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Melina Martinez
- Laboratory of Molecular Microbiology, Institute of Basic and Applied Microbiology, National University of Quilmes, Bernal, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Patricia Maturana
- Centro de Investigación en Biofísica Aplicada y Alimentos, Consejo Nacional de Investigaciones Científicas y Técnicas and National University of Santiago del Estero, Santiago del Estero, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Liliana C Semorile
- Laboratory of Molecular Microbiology, Institute of Basic and Applied Microbiology, National University of Quilmes, Bernal, Argentina
| | - Paulo C Maffia
- Laboratory of Molecular Microbiology, Institute of Basic and Applied Microbiology, National University of Quilmes, Bernal, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
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14
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Bohinc K, Bossa GV, May S. Incorporation of ion and solvent structure into mean-field modeling of the electric double layer. Adv Colloid Interface Sci 2017; 249:220-233. [PMID: 28571611 DOI: 10.1016/j.cis.2017.05.001] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/28/2017] [Accepted: 05/02/2017] [Indexed: 01/13/2023]
Abstract
An electric double layer forms when the small mobile ions of an electrolyte interact with an extended charged object, a macroion. The competition between electrostatic attraction and translational entropy loss of the small ions results in a diffuse layer of partially immobilized ions in the vicinity of the macroion. Modeling structure and energy of the electric double layer has a long history that has lead to the classical Poisson-Boltzmann theory and numerous extensions that account for ion-ion correlations and structural ion and solvent properties. The present review focuses on approaches that instead of going beyond the mean-field character of Poisson-Boltzmann theory introduce structural details of the ions and the solvent into the Poisson-Boltzmann modeling framework. The former include not only excluded volume effects but also the presence of charge distributions on individual ions, spatially extended ions, and internal ionic degrees of freedom. The latter treat the solvent either explicitly as interacting Langevin dipoles or in the form of effective non-electrostatic interactions, in particular Yukawa interactions, that are added to the Coulomb potential. We discuss how various theoretical models predict structural properties of the electric double layer such as the differential capacitance and compare some of these predictions with computer simulations.
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Affiliation(s)
- Klemen Bohinc
- Faculty of Health Sciences, University of Ljubljana, Ljubljana SI-1000, Slovenia.
| | | | - Sylvio May
- Department of Physics, North Dakota State University, Fargo, ND 58108-6050, USA
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15
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Shen H, Deng M, Zhang Y. Extension of CAVS coarse-grained model to phospholipid membranes: The importance of electrostatics. J Comput Chem 2017; 38:971-980. [DOI: 10.1002/jcc.24770] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Revised: 01/24/2017] [Accepted: 01/30/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Hujun Shen
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science; Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University; No. 115, Gaoxin Road Guiyang Guizhou 550018 People's Republic of China
| | - Mingsen Deng
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science; Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University; No. 115, Gaoxin Road Guiyang Guizhou 550018 People's Republic of China
| | - Yachao Zhang
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science; Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University; No. 115, Gaoxin Road Guiyang Guizhou 550018 People's Republic of China
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16
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Rufeil-Fiori E, Wilke N, Banchio AJ. Dipolar interactions between domains in lipid monolayers at the air-water interface. SOFT MATTER 2016; 12:4769-77. [PMID: 27139819 DOI: 10.1039/c5sm02862k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A great variety of biologically relevant monolayers present phase coexistence characterized by domains formed by lipids in an ordered phase state dispersed in a continuous, disordered phase. From the difference in surface densities between these phases, inter-domain dipolar interactions arise. These interactions are relevant for the determination of the spacial distribution of domains as well as their dynamics. In this work, we propose a novel way of estimating the dipolar repulsion using a passive method that involves the analysis of images of the monolayer with phase coexistence. This method is based on the comparison of the pair correlation function obtained from experiments with that obtained from Brownian dynamics simulations of a model system. As an example, we determined the difference in dipolar density of a binary monolayer of DSPC/DMPC at the air-water interface from the analysis of the radial distribution of domains, and the results are compared with those obtained by surface potential determinations. A systematic analysis for the experimentally relevant parameter range is given, which may be used as a working curve for obtaining the dipolar repulsion in different systems.
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Affiliation(s)
- Elena Rufeil-Fiori
- Instituto de Física Enrique Gaviola, IFEG, CONICET and Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
| | - Natalia Wilke
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Adolfo J Banchio
- Instituto de Física Enrique Gaviola, IFEG, CONICET and Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
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Casper CB, Verreault D, Adams EM, Hua W, Allen HC. Surface Potential of DPPC Monolayers on Concentrated Aqueous Salt Solutions. J Phys Chem B 2016; 120:2043-52. [PMID: 26761608 DOI: 10.1021/acs.jpcb.5b10483] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Clayton B. Casper
- Department of Chemistry and
Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Dominique Verreault
- Department of Chemistry and
Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Ellen M. Adams
- Department of Chemistry and
Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Wei Hua
- Department of Chemistry and
Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Heather C. Allen
- Department of Chemistry and
Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
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Khitrin A, Khitrin K, Model M. A model for membrane potential and intracellular ion distribution. Chem Phys Lipids 2014; 184:76-81. [DOI: 10.1016/j.chemphyslip.2014.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 10/27/2014] [Accepted: 10/31/2014] [Indexed: 10/24/2022]
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