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Ramezanpour M, Schmidt ML, Bashe BYM, Pruim JR, Link ML, Cullis PR, Harper PE, Thewalt JL, Tieleman DP. Structural Properties of Inverted Hexagonal Phase: A Hybrid Computational and Experimental Approach. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:6668-6680. [PMID: 32437159 DOI: 10.1021/acs.langmuir.0c00600] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Inverted/reverse hexagonal (HII) phases are of special interest in several fields of research, including nanomedicine. We used molecular dynamics (MD) simulation to study HII systems composed of dioleoylphosphatidylethanolamine (DOPE) and palmitoyloleoylphosphatidylethanolamine (POPE) at several hydration levels and temperatures. The effect of the hydration level on several HII structural parameters, including deuterium order parameters, was investigated. We further used MD simulations to estimate the maximum hydrations of DOPE and POPE HII lattices at several given temperatures. Finally, the effect of acyl chain unsaturation degree on the HII structure was studied via comparing the DOPE with POPE HII systems. In addition to MD simulations, we used deuterium nuclear magnetic resonance (2H NMR) and small-angle X-ray scattering (SAXS) experiments to measure the DOPE acyl chain order parameters, lattice plane distances, and the water core radius in HII phase DOPE samples at several temperatures in the presence of excess water. Structural parameters calculated from MD simulations are in excellent agreement with the experimental data. Dehydration decreases the radius of the water core. An increase in hydration level slightly increased the deuterium order parameter of lipids acyl chains, whereas an increase in temperature decreased it. Lipid cylinders undulated along the cylinder axis as a function of hydration level. The maximum hydration levels of PE HII phases at different temperatures were successfully predicted by MD simulations based on a single experimental measurement for the lattice plane distance in the presence of excess water. An increase in temperature decreases the maximum hydration and consequently the radius of the water core and lattice plane distances. Finally, DOPE formed HII structures with a higher curvature compared to POPE, as expected. We propose a general protocol for constructing computational HII systems that correspond to the experimental systems. This protocol could be used to study HII systems composed of molecules other than the PE systems used here and to improve and validate force field parameters by using the target data in the HII phase.
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Affiliation(s)
- M Ramezanpour
- Centre for Molecular Simulation, Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - M L Schmidt
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - B Y M Bashe
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - J R Pruim
- Department of Physics and Astronomy, Calvin University, Grand Rapids, Michigan 49546, United States
| | - M L Link
- Department of Physics and Astronomy, Calvin University, Grand Rapids, Michigan 49546, United States
| | - P R Cullis
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - P E Harper
- Department of Physics and Astronomy, Calvin University, Grand Rapids, Michigan 49546, United States
| | - J L Thewalt
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
- Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - D P Tieleman
- Centre for Molecular Simulation, Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada
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Mishraki-Berkowitz T, Aserin A, Garti N. Structural properties and release of insulin-loaded reverse hexagonal (HII) liquid crystalline mesophase. J Colloid Interface Sci 2017; 486:184-193. [DOI: 10.1016/j.jcis.2016.09.074] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 09/28/2016] [Accepted: 09/28/2016] [Indexed: 12/15/2022]
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Oliveira ACN, Nogueira SS, Gonçalves O, Cerqueira MF, Alpuim P, Tovar J, Rodriguez-Abreu C, Brezesinski G, Gomes AC, Lúcio M, Oliveira MECDR. Role of counter-ion and helper lipid content in the design and properties of nanocarrier systems: a biophysical study in 2D and 3D lipid assemblies. RSC Adv 2016. [DOI: 10.1039/c6ra08125h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study validates a model for DODAX : MO assemblies highlighting the role of counter-ion and MO content in their biophysical properties.
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Affiliation(s)
- Ana C. N. Oliveira
- CBMA (Centre of Molecular and Environmental Biology)
- Department of Biology
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
| | - Sara S. Nogueira
- CFUM (Centre of Physics)
- Department of Physics
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
| | - Odete Gonçalves
- CBMA (Centre of Molecular and Environmental Biology)
- Department of Biology
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
| | - M. F. Cerqueira
- CFUM (Centre of Physics)
- Department of Physics
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
| | - P. Alpuim
- CFUM (Centre of Physics)
- Department of Physics
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
| | - Júlia Tovar
- CFUM (Centre of Physics)
- Department of Physics
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
| | | | | | - Andreia C. Gomes
- CBMA (Centre of Molecular and Environmental Biology)
- Department of Biology
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
| | - Marlene Lúcio
- CFUM (Centre of Physics)
- Department of Physics
- University of Minho
- Campus of Gualtar
- 4710-057 Braga
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Unit cell structure of water-filled monoolein in inverted hexagonal mesophase in the presence of incorporated tricaprylin and entrapped lysozyme. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2015; 45:99-112. [DOI: 10.1007/s00249-015-1080-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 09/01/2015] [Accepted: 09/02/2015] [Indexed: 11/27/2022]
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Roy B, Satpathi S, Gavvala K, Koninti RK, Hazra P. Solvation Dynamics in Different Phases of the Lyotropic Liquid Crystalline System. J Phys Chem B 2015; 119:11721-31. [PMID: 26258397 DOI: 10.1021/acs.jpcb.5b04370] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Reverse hexagonal (HII) liquid crystalline material based on glycerol monooleate (GMO) is considered as a potential carrier for drugs and other important biomolecules due to its thermotropic phase change and excellent morphology. In this work, the dynamics of encapsulated water, which plays important role in stabilization and formation of reverse hexagonal mesophase, has been investigated by time dependent Stokes shift method using Coumarin-343 as a solvation probe. The formation of the reverse hexagonal mesophase (HII) and transformation to the L2 phase have been monitored using small-angle X-ray scattering and polarized light microscopy experiments. REES studies suggest the existence of different polar regions in both HII and L2 systems. The solvation dynamics study inside the reverse hexagonal (HII) phase reveals the existence of two different types of water molecules exhibiting dynamics on a 120-900 ps time scale. The estimated diffusion coefficients of both types of water molecules obtained from the observed dynamics are in good agreement with the measured diffusion coefficient collected from the NMR study. The calculated activation energy is found to be 2.05 kcal/mol, which is associated with coupled rotational-translational water relaxation dynamics upon the transition from "bound" to "quasi-free" state. The observed ∼2 ns faster dynamics of the L2 phase compared to the HII phase may be associated with both the phase transformation as well as thermotropic effect on the relaxation process. Microviscosities calculated from time-resolved anisotropy studies infer that the interface is almost ∼22 times higher viscous than the central part of the cylinder. Overall, our results reveal the unique dynamical features of water inside the cylinder of reverse hexagonal and inverse micellar phases.
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Affiliation(s)
- Bibhisan Roy
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Sagar Satpathi
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Krishna Gavvala
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Raj Kumar Koninti
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Partha Hazra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
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Yurchenko SO, Kryuchkov NP. The structure and spectral properties of two-dimensional dipole systems. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/486/1/012031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nguan H, Ahmadi S, Hashim R. Molecular dynamics simulations of the lyotropic reverse hexagonal (HII) of Guerbet branched-chain β-d-glucoside. Phys Chem Chem Phys 2014; 16:324-34. [DOI: 10.1039/c3cp52385c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Modulation of physical properties of reverse hexagonal mesophases: A dielectric spectroscopy study. J Colloid Interface Sci 2013; 396:178-86. [DOI: 10.1016/j.jcis.2012.12.067] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Revised: 12/17/2012] [Accepted: 12/18/2012] [Indexed: 11/19/2022]
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