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Liu S, Zhang C, Li L, Deng X, Hu C, Yang F, Liu Q, Tan W. Organization of an Artificial Multicellular System with a Tunable DNA Patch on a Membrane Surface. Nano Lett 2024; 24:433-440. [PMID: 38112415 DOI: 10.1021/acs.nanolett.3c04249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Coordinating multiple artificial cellular compartments into a well-organized artificial multicellular system (AMS) is of great interest in bottom-up synthetic biology. However, developing a facile strategy for fabricating an AMS with a controlled arrangement remains a challenge. Herein, utilizing in situ DNA hybridization chain reaction on the membrane surface, we developed a DNA patch-based strategy to direct the interconnection of vesicles. By tuning the DNA patch that generates heterotrophic adhesion for the attachment of vesicles, we could produce an AMS with higher-order structures straightforwardly and effectively. Furthermore, a hybrid AMS comprising live cells and vesicles was fabricated, and we found the hybrid AMS with higher-order structures arouses efficient molecular transportation from vesicles to living cells. In brief, our work provides a versatile strategy for modulating the self-assembly of AMSs, which could expand our capability to engineer synthetic biological systems and benefit synthetic cell research in programmable manipulation of intercellular communications.
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Affiliation(s)
- Shuang Liu
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
| | - Chunjuan Zhang
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
| | - Lexun Li
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
| | - Xiaodan Deng
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
| | - Canqiong Hu
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
| | - Fan Yang
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
| | - Qiaoling Liu
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
| | - Weihong Tan
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, FuRong Laboratory, College of Biology, Hunan University, Changsha, Hunan 410082, China
- The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institute of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, Zhejiang 310022, China
- School of Materials Science and Engineering, Institute of Molecular Medicine (IMM), Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai 200240, China
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2
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Balleza D. Peptide Flexibility and the Hydrophobic Moment are Determinants to Evaluate the Clinical Potential of Magainins. J Membr Biol 2023; 256:317-330. [PMID: 37097306 DOI: 10.1007/s00232-023-00286-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Accepted: 04/05/2023] [Indexed: 04/26/2023]
Abstract
Using a flexibility prediction algorithm and in silico structural modeling, we have calculated the intrinsic flexibility of several magainin derivatives. In the case of magainin-2 (Mag-2) and magainin H2 (MAG-H2) we have found that MAG-2 is more flexible than its hydrophobic analog, Mag-H2. This affects the degree of bending of both peptides, with a kink around two central residues (R10, R11), whereas, in Mag-H2, W10 stiffens the peptide. Moreover, this increases the hydrophobic moment of Mag-H2, which could explain its propensity to form pores in POPC model membranes, which exhibit near-to-zero spontaneous curvatures. Likewise, the protective effect described in DOPC membranes for this peptide regarding its facilitation in pore formation would be related to the propensity of this lipid to form membranes with negative spontaneous curvature. The flexibility of another magainin analog (MSI-78) is even greater than that of Mag-2. This facilitates the peptide to present a kind of hinge around the central F12 as well as a C-terminal end prone to be disordered. Such characteristics are key to understanding the broad-spectrum antimicrobial actions exhibited by this peptide. These data reinforce the hypothesis on the determinant role of spontaneous membrane curvature, intrinsic peptide flexibility, and specific hydrophobic moment in assessing the bioactivity of membrane-active antimicrobial peptides.
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Affiliation(s)
- Daniel Balleza
- Laboratorio de Microbiología, Unidad de Investigación y Desarrollo en Alimentos, Instituto Tecnológico de Veracruz, Tecnológico Nacional de México, Veracruz, Mexico.
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3
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Park S, Cho NJ. Lipid Membrane Interface Viewpoint: From Viral Entry to Antiviral and Vaccine Development. Langmuir 2023; 39:1-11. [PMID: 36576966 DOI: 10.1021/acs.langmuir.2c02501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Membrane-enveloped viruses are responsible for most viral pandemics in history, and more effort is needed to advance broadly applicable countermeasures to mitigate the impact of future outbreaks. In this Perspective, we discuss how biosensing techniques associated with lipid model membrane platforms are contributing to improving our mechanistic knowledge of membrane fusion and destabilization that is closely linked to viral entry as well as vaccine and antiviral drug development. A key benefit of these platforms is the simplicity of interpreting the results which can be complemented by other techniques to decipher more complicated biological observations and evaluate the biophysical functionalities that can be correlated to biological activities. Then, we introduce exciting application examples of membrane-targeting antivirals that have been refined over time and will continue to improve based on biophysical insights. Two ways to abrogate the function of viral membranes are introduced here: (1) selective disruption of the viral membrane structure and (2) alteration of the membrane component. While both methods are suitable for broadly useful antivirals, the latter also has the potential to produce an inactivated vaccine. Collectively, we emphasize how biosensing tools based on membrane interfacial science can provide valuable information that could be translated into biomedicines and improve their selectivity and performance.
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Affiliation(s)
- Soohyun Park
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Hazra B, Mondal A, Prasad M, Gayen S, Mandal R, Sardar A, Tarafdar PK. Lipidated Lysine and Fatty Acids Assemble into Protocellular Membranes to Assist Regioselective Peptide Formation: Correlation to the Natural Selection of Lysine over Nonproteinogenic Lower Analogues. Langmuir 2022; 38:15422-15432. [PMID: 36450098 DOI: 10.1021/acs.langmuir.2c02849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The self-assembly of prebiotically plausible amphiphiles (fatty acids) to form a bilayer membrane for compartmentalization is an important factor during protocellular evolution. Such fatty acid-based membranes assemble at relatively high concentrations, and they lack robust stability. We have demonstrated that a mixture of lipidated lysine (cationic) and prebiotic fatty acids (decanoic acid, anionic) can form protocellular membranes (amino acid-based membranes) at low concentrations via electrostatic, hydrogen bonding, and hydrophobic interactions. The formation of vesicular membranes was characterized by dynamic light scattering (DLS), pyrene and Nile Red partitioning, cryo-transmission electron microscopy (TEM) images, and glucose encapsulation studies. The lipidated nonproteinogenic analogues of lysine (Lys), such as ornithine (Orn) and 2,4-diaminobutyric acid (Dab), also form membranes with decanoate (DA). Time-dependent turbidimetric and 1H NMR studies suggested that the Lys-based membrane is more stable than the membranes prepared from nonproteinogenic lower analogues. The Lys-based membrane embeds a model acylating agent (aminoacyl-tRNA mimic) and facilitates the colocalization of substrates to support regioselective peptide formation via the α-amine of Lys. These membranes thereby assist peptide formation and control the positioning of the reactants (model acylating agent and -NH2 of amino acids) to initiate biologically relevant reactions during early evolution.
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Affiliation(s)
- Bibhas Hazra
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Anoy Mondal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Mahesh Prasad
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Soumajit Gayen
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Raki Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Avijit Sardar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Pradip K Tarafdar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
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Disalvo EA, Rosa AS, Cejas JP, Frias MDLA. Water as a Link between Membrane and Colloidal Theories for Cells. Molecules 2022; 27:molecules27154994. [PMID: 35956945 PMCID: PMC9370763 DOI: 10.3390/molecules27154994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/01/2022] [Accepted: 08/01/2022] [Indexed: 11/16/2022]
Abstract
This review is an attempt to incorporate water as a structural and thermodynamic component of biomembranes. With this purpose, the consideration of the membrane interphase as a bidimensional hydrated polar head group solution, coupled to the hydrocarbon region allows for the reconciliation of two theories on cells in dispute today: one considering the membrane as an essential part in terms of compartmentalization, and another in which lipid membranes are not necessary and cells can be treated as a colloidal system. The criterium followed is to describe the membrane state as an open, non-autonomous and responsive system using the approach of Thermodynamic of Irreversible Processes. The concept of an open/non-autonomous membrane system allows for the visualization of the interrelationship between metabolic events and membrane polymorphic changes. Therefore, the Association Induction Hypothesis (AIH) and lipid properties interplay should consider hydration in terms of free energy modulated by water activity and surface (lateral) pressure. Water in restricted regions at the lipid interphase has thermodynamic properties that explain the role of H-bonding networks in the propagation of events between membrane and cytoplasm that appears to be relevant in the context of crowded systems.
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Pismenskaya N, Rybalkina O, Moroz I, Mareev S, Nikonenko V. Influence of Electroconvection on Chronopotentiograms of an Anion-Exchange Membrane in Solutions of Weak Polybasic Acid Salts. Int J Mol Sci 2021; 22:ijms222413518. [PMID: 34948329 PMCID: PMC8708104 DOI: 10.3390/ijms222413518] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/10/2021] [Accepted: 12/13/2021] [Indexed: 12/25/2022] Open
Abstract
Visualization of electroconvective (EC) vortices at the undulated surface of an AMX anion-exchange membrane (Astom, Osaka, Japan) was carried out in parallel with the measurement of chronopotentiograms. Weak polybasic acid salts, including 0.02 M solutions of tartaric (NaHT), phosphoric (NaH2PO4), and citric (NaH2Cit) acids salts, and NaCl were investigated. It was shown that, for a given current density normalized to the theoretical limiting current calculated by the Leveque equation (i/ilimtheor), EC vortex zone thickness, dEC, decreases in the order NaCl > NaHT > NaH2PO4 > NaH2Cit. This order is inverse to the increase in the intensity of proton generation in the membrane systems under study. The higher the intensity of proton generation, the lower the electroconvection. This is due to the fact that protons released into the depleted solution reduce the space charge density, which is the driver of EC. In all studied systems, a region in chronopotentiograms between the rapid growth of the potential drop and the attainment of its stationary values corresponds to the appearance of EC vortex clusters. The amplitude of the potential drop oscillations in the chronopotentiograms is proportional to the size of the observed vortex clusters.
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Kabir MA, Hirakawa A, Zhu B, Yokozeki K, Shakya M, Huang B, Akazawa T, Todoh M, Murata M. Mechanical Properties of Human Concentrated Growth Factor (CGF) Membrane and the CGF Graft with Bone Morphogenetic Protein-2 (BMP-2) onto Periosteum of the Skull of Nude Mice. Int J Mol Sci 2021; 22:11331. [PMID: 34768759 PMCID: PMC8582862 DOI: 10.3390/ijms222111331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 11/25/2022] Open
Abstract
Concentrated growth factor (CGF) is 100% blood-derived, cross-linked fibrin glue with platelets and growth factors. Human CGF clot is transformed into membrane by a compression device, which has been widely used clinically. However, the mechanical properties of the CGF membranes have not been well characterized. The aims of this study were to measure the tensile strength of human CGF membrane and observe its behavior as a scaffold of BMP-2 in ectopic site over the skull. The tensile test of the full length was performed at the speed of 2mm/min. The CGF membrane (5 × 5 × 2 mm3) or the CGF/BMP-2 (1.0 μg) membrane was grafted onto the skull periosteum of nude mice (5-week-old, male), and harvested at 14 days after the graft. The appearance and size of the CGF membranes were almost same for 7 days by soaking at 4 °C in saline. The average values of the tensile strength at 0 day and 7 days were 0.24 MPa and 0.26 MPa, respectively. No significant differences of both the tensile strength and the elastic modulus were found among 0, 1, 3, and 7 days. Supra-periosteal bone induction was found at 14 days in the CGF/BMP-2, while the CGF alone did not induce bone. These results demonstrated that human CGF membrane could become a short-term, sticky fibrin scaffold for BMP-2, and might be preserved as auto-membranes for wound protection after the surgery.
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Affiliation(s)
- Md. Arafat Kabir
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Akihiro Hirakawa
- Biomechanical Design Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-0819, Japan; (A.H.); (M.T.)
| | - Bowen Zhu
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Kenji Yokozeki
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Mamata Shakya
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Bingzhen Huang
- Corefront Corporation, 2-11 Ichitanihonmura-cho, Shinjuku-ku, Tokyo 162-0845, Japan;
| | - Toshiyuki Akazawa
- Industrial Technology and Environment Research Development, Hokkaido Research Organization, Kita 19-jo Nishi 11-chome, Kita-ku, Sapporo 060-0819, Japan;
| | - Masahiro Todoh
- Biomechanical Design Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-0819, Japan; (A.H.); (M.T.)
| | - Masaru Murata
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
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8
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Scarascia G, Fortunato L, Myshkevych Y, Cheng H, Leiknes T, Hong PY. UV and bacteriophages as a chemical-free approach for cleaning membranes from anaerobic bioreactors. Proc Natl Acad Sci U S A 2021; 118:e2016529118. [PMID: 34493685 PMCID: PMC8449398 DOI: 10.1073/pnas.2016529118] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Anaerobic membrane bioreactor (AnMBR) for wastewater treatment has attracted much interest due to its efficacy in providing high-quality effluent with minimal energy costs. However, membrane biofouling represents the main bottleneck for AnMBR because it diminishes flux and necessitates frequent replacement of membranes. In this study, we assessed the feasibility of combining bacteriophages and UV-C irradiation to provide a chemical-free approach to remove biofoulants on the membrane. The combination of bacteriophage and UV-C resulted in better log cells removal and ca. 2× higher extracellular polymeric substance (EPS) concentration reduction in mature biofoulants compared to either UV-C or bacteriophage alone. The cleaning mechanism behind this combined approach is by 1) reducing the relative abundance of Acinetobacter spp. and selected bacteria (e.g., Paludibacter, Pseudomonas, Cloacibacterium, and gram-positive Firmicutes) associated with the membrane biofilm and 2) forming cavities in the biofilm to maintain water flux through the membrane. When the combined treatment was further compared with the common chemical cleaning procedure, a similar reduction on the cell numbers was observed (1.4 log). However, the combined treatment was less effective in removing EPS compared with chemical cleaning. These results suggest that the combination of UV-C and bacteriophage have an additive effect in biofouling reduction, representing a potential chemical-free method to remove reversible biofoulants on membrane fitted to an AnMBR.
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Affiliation(s)
- Giantommaso Scarascia
- Water Desalination and Reuse Center, Biological and Environmental Science & Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Luca Fortunato
- Water Desalination and Reuse Center, Biological and Environmental Science & Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Yevhen Myshkevych
- Water Desalination and Reuse Center, Biological and Environmental Science & Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Hong Cheng
- Water Desalination and Reuse Center, Biological and Environmental Science & Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - TorOve Leiknes
- Water Desalination and Reuse Center, Biological and Environmental Science & Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Pei-Ying Hong
- Water Desalination and Reuse Center, Biological and Environmental Science & Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
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Yang F, Hellbach F, Rochau F, Belzig W, Weig EM, Rastelli G, Scheer E. Persistent Response in an Ultrastrongly Driven Mechanical Membrane Resonator. Phys Rev Lett 2021; 127:014304. [PMID: 34270281 DOI: 10.1103/physrevlett.127.014304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 06/01/2021] [Accepted: 06/04/2021] [Indexed: 06/13/2023]
Abstract
We study experimentally and theoretically the phenomenon of "persistent response" in ultrastrongly driven membrane resonators. The term persistent response denotes the development of a vibrating state with nearly constant amplitude over an extreme wide frequency range. We reveal the underlying mechanism by directly imaging the vibrational state using advanced optical interferometry. We argue that this state is related to the nonlinear interaction between higher-order flexural modes and higher-order overtones of the driven mode. Finally, we propose a stability diagram for the different vibrational states that the membrane can adopt.
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Affiliation(s)
- Fan Yang
- Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
| | | | - Felix Rochau
- Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
| | - Wolfgang Belzig
- Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
| | - Eva M Weig
- Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
- Fakultät für Elektrotechnik und Informationstechnik, Technische Universität München, 80333 München, Germany
| | - Gianluca Rastelli
- Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
- INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy
| | - Elke Scheer
- Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
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Mertz M, Castiglione K. Increased Protein Encapsulation in Polymersomes with Hydrophobic Membrane Anchoring Peptides in a Scalable Process. Int J Mol Sci 2021; 22:7134. [PMID: 34281201 PMCID: PMC8268381 DOI: 10.3390/ijms22137134] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/28/2021] [Accepted: 06/28/2021] [Indexed: 11/17/2022] Open
Abstract
Hollow vesicles made from a single or double layer of block-copolymer molecules, called polymersomes, represent an important technological platform for new developments in nano-medicine and nano-biotechnology. A central aspect in creating functional polymersomes is their combination with proteins, especially through encapsulation in the inner cavity of the vesicles. When producing polymersomes by techniques such as film rehydration, significant proportions of the proteins used are trapped in the vesicle lumen, resulting in high encapsulation efficiencies. However, because of the difficulty of scaling up, such methods are limited to laboratory experiments and are not suitable for industrial scale production. Recently, we developed a scalable polymersome production process in stirred-tank reactors, but the statistical encapsulation of proteins resulted in fairly low encapsulation efficiencies of around 0.5%. To increase encapsulation in this process, proteins were genetically fused with hydrophobic membrane anchoring peptides. This resulted in encapsulation efficiencies of up to 25.68%. Since proteins are deposited on the outside and inside of the polymer membrane in this process, two methods for the targeted removal of protein domains by proteolysis with tobacco etch virus protease and intein splicing were evaluated. This study demonstrates the proof-of-principle for production of protein-functionalized polymersomes in a scalable process.
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Affiliation(s)
| | - Kathrin Castiglione
- Institute of Bioprocess Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91052 Erlangen, Germany;
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11
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Roterman I, Stapor K, Fabian P, Konieczny L, Banach M. Model of Environmental Membrane Field for Transmembrane Proteins. Int J Mol Sci 2021; 22:ijms22073619. [PMID: 33807215 PMCID: PMC8036355 DOI: 10.3390/ijms22073619] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/20/2021] [Accepted: 03/27/2021] [Indexed: 11/16/2022] Open
Abstract
The water environment determines the activity of biological processes. The role of such an environment interpreted in the form of an external field expressed by the 3D Gaussian distribution in the fuzzy oil drop model directs the folding process towards the generation of a centrally located hydrophobic core with the simultaneous exposure of polar residues on the surface. In addition to proteins soluble in the water environment, there is a significant group of membrane proteins that act as receptors or channels, including ion channels in particular. The change of the polar (water) environment into a highly hydrophobic (membrane) environment is quite radical, resulting in a different hydrophobicity distribution within the membrane protein. Modification of the notation of the force field expressing the presence of the hydrophobic environment has been proposed in this work. A modified fuzzy oil drop model with its adaptation to membrane proteins was used to interpret the structure of membrane proteins–mechanosensitive channel. The modified model was also used to describe the so-called negative cases—i.e., for water-soluble proteins with a clear distribution consistent with the fuzzy oil drop model.
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Affiliation(s)
- Irena Roterman
- Department of Bioinformatics and Telemedicine, Jagiellonian University—Medical College, 30-688 Kraków, Poland;
- Correspondence:
| | - Katarzyna Stapor
- Institute of Computer Science, Silesian University of Technology, 44-100 Gliwice, Poland; (K.S.); (P.F.)
| | - Piotr Fabian
- Institute of Computer Science, Silesian University of Technology, 44-100 Gliwice, Poland; (K.S.); (P.F.)
| | - Leszek Konieczny
- Chair of Medical Biochemistry, Jagiellonian University—Medical College, 31-034 Kraków, Poland;
| | - Mateusz Banach
- Department of Bioinformatics and Telemedicine, Jagiellonian University—Medical College, 30-688 Kraków, Poland;
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12
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Trombino S, Curcio F, Poerio T, Pellegrino M, Russo R, Cassano R. Chitosan Membranes Filled with Cyclosporine A as Possible Devices for Local Administration of Drugs in the Treatment of Breast Cancer. Molecules 2021; 26:molecules26071889. [PMID: 33810514 PMCID: PMC8036521 DOI: 10.3390/molecules26071889] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/19/2021] [Accepted: 03/23/2021] [Indexed: 01/12/2023] Open
Abstract
The aim of this work is the design, preparation and characterization of membranes based on cyclosporine A (CsA) and chitosan carboxylate (CC) to be used as an implantable subcutaneous medical device for a prolonged therapeutic effect in the treatment of breast cancer. The choice to use CsA is due to literature data that have demonstrated its possible antitumor activity on different types of neoplastic cells. To this end, CsA was bound to CC through an amidation reaction to obtain a prodrug to be dispersed in a chitosan-based polymeric membrane. The reaction intermediates and the final product were characterized by Fourier transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (1H-NMR). Membranes were analyzed by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The data obtained showed the effective formation of the amide bond between CsA and CC and the complete dispersion of CsA inside the polymeric membrane. Furthermore, preliminary tests, conducted on MDA-MB-231, a type of breast cancer cell line, have shown a high reduction in the proliferation of cancer cells. These results indicate the possibility of using the obtained membranes as an interesting strategy for the release of cyclosporin-A in breast cancer patients.
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Affiliation(s)
- Sonia Trombino
- Department of Pharmacy and Health and Nutrition Sciences, University of Calabria, Arcavacata di Rende, 87036 Cosenza, Italy; (S.T.); (F.C.); (M.P.); (R.R.)
| | - Federica Curcio
- Department of Pharmacy and Health and Nutrition Sciences, University of Calabria, Arcavacata di Rende, 87036 Cosenza, Italy; (S.T.); (F.C.); (M.P.); (R.R.)
| | - Teresa Poerio
- Institute on Membrane Technology (CNR-ITM), University of Calabria, Arcavacata di Rende, 87036 Cosenza, Italy;
| | - Michele Pellegrino
- Department of Pharmacy and Health and Nutrition Sciences, University of Calabria, Arcavacata di Rende, 87036 Cosenza, Italy; (S.T.); (F.C.); (M.P.); (R.R.)
| | - Rossella Russo
- Department of Pharmacy and Health and Nutrition Sciences, University of Calabria, Arcavacata di Rende, 87036 Cosenza, Italy; (S.T.); (F.C.); (M.P.); (R.R.)
| | - Roberta Cassano
- Department of Pharmacy and Health and Nutrition Sciences, University of Calabria, Arcavacata di Rende, 87036 Cosenza, Italy; (S.T.); (F.C.); (M.P.); (R.R.)
- Correspondence: ; Tel.: +39-984-493227
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13
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Sarewicz M, Pintscher S, Pietras R, Borek A, Bujnowicz Ł, Hanke G, Cramer WA, Finazzi G, Osyczka A. Catalytic Reactions and Energy Conservation in the Cytochrome bc1 and b6f Complexes of Energy-Transducing Membranes. Chem Rev 2021; 121:2020-2108. [PMID: 33464892 PMCID: PMC7908018 DOI: 10.1021/acs.chemrev.0c00712] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Indexed: 12/16/2022]
Abstract
This review focuses on key components of respiratory and photosynthetic energy-transduction systems: the cytochrome bc1 and b6f (Cytbc1/b6f) membranous multisubunit homodimeric complexes. These remarkable molecular machines catalyze electron transfer from membranous quinones to water-soluble electron carriers (such as cytochromes c or plastocyanin), coupling electron flow to proton translocation across the energy-transducing membrane and contributing to the generation of a transmembrane electrochemical potential gradient, which powers cellular metabolism in the majority of living organisms. Cytsbc1/b6f share many similarities but also have significant differences. While decades of research have provided extensive knowledge on these enzymes, several important aspects of their molecular mechanisms remain to be elucidated. We summarize a broad range of structural, mechanistic, and physiological aspects required for function of Cytbc1/b6f, combining textbook fundamentals with new intriguing concepts that have emerged from more recent studies. The discussion covers but is not limited to (i) mechanisms of energy-conserving bifurcation of electron pathway and energy-wasting superoxide generation at the quinol oxidation site, (ii) the mechanism by which semiquinone is stabilized at the quinone reduction site, (iii) interactions with substrates and specific inhibitors, (iv) intermonomer electron transfer and the role of a dimeric complex, and (v) higher levels of organization and regulation that involve Cytsbc1/b6f. In addressing these topics, we point out existing uncertainties and controversies, which, as suggested, will drive further research in this field.
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Affiliation(s)
- Marcin Sarewicz
- Department
of Molecular Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
| | - Sebastian Pintscher
- Department
of Molecular Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
| | - Rafał Pietras
- Department
of Molecular Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
| | - Arkadiusz Borek
- Department
of Molecular Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
| | - Łukasz Bujnowicz
- Department
of Molecular Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
| | - Guy Hanke
- School
of Biological and Chemical Sciences, Queen
Mary University of London, London E1 4NS, U.K.
| | - William A. Cramer
- Department
of Biological Sciences, Purdue University, West Lafayette, Indiana 47907 United States
| | - Giovanni Finazzi
- Laboratoire
de Physiologie Cellulaire et Végétale, Université Grenoble Alpes, Centre National Recherche Scientifique,
Commissariat Energie Atomique et Energies Alternatives, Institut National
Recherche l’agriculture, l’alimentation et l’environnement, 38054 Grenoble Cedex 9, France
| | - Artur Osyczka
- Department
of Molecular Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland
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14
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Wu L, Jin X, Zhao T, Wang H, Dai Z. Impact factors of the degradation of bisphenol A by nitrocellulose membrane under illumination. J Environ Sci (China) 2021; 100:193-202. [PMID: 33279032 DOI: 10.1016/j.jes.2020.05.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 05/08/2020] [Accepted: 05/08/2020] [Indexed: 06/12/2023]
Abstract
Nitrocellulose membrane (NCM) can produce hydroxyl radicals under illumination, which promotes the oxidative degradation of organic pollutants. In this paper, NCM was used to oxidize bisphenol A (BPA) under simulated sunlight. The effects of pH, temperature, light intensity, anion and cation on the degradation of BPA were analyzed. The photodegradation process of BPA was discussed. The optimal photolysis rate was 0.031 min-1 when the temperature was 30°C, the light intensity was 2.67 × 104 Lux, and the pH value was 9.0. The alkaline environment, temperature and light intensity can promote the photodegradation of BPA. Except for nitrate ions, anions and cations can inhibit the photodegradation of BPA. Compared with cations, anions have a greater inhibitory effect on BPA degradation. The degradation products of BPA by NCM were analyzed by gas chromatographic/mass. This study may provide useful information for the BPA degradation by NCM in complex water samples.
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Affiliation(s)
- Li Wu
- Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China; Collaborative Innovation Center for Coal-Bed Methane and Shale Gas of Henan, Jiaozuo 454000, China
| | - Xinmiao Jin
- Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
| | - Tongqian Zhao
- Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China.
| | - Haipo Wang
- Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
| | - Zhifeng Dai
- Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
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15
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Boldini A, Cha Y, Porfiri M. Solvation-Driven Electrochemical Actuation. Phys Rev Lett 2021; 126:046001. [PMID: 33576667 DOI: 10.1103/physrevlett.126.046001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 11/03/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
We demonstrate a novel principle of contactless actuation for ionic membranes in salt solution based on solvation. Actuation is driven by differential swelling of the sides of the membrane, due to comigrating water in the solvation shells of mobile ions. We validate our theory through a series of experiments, which unravel a strong dependence of membrane deflection on the hydration numbers of mobile ions in the external solution and membrane. Our study suggests a critical role of solvation in the chemoelectromechanics of natural and artificial selectively permeable membranes.
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Affiliation(s)
- Alain Boldini
- Department of Mechanical and Aerospace Engineering, New York University Tandon School of Engineering, Brooklyn, New York 11201, USA
| | - Youngsu Cha
- Center for Intelligent and Interactive Robotics, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Maurizio Porfiri
- Department of Mechanical and Aerospace Engineering, Department of Biomedical Engineering, and Center for Urban Science and Progress, New York University Tandon School of Engineering, Brooklyn, New York 11201, USA
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16
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Zizovic I, Tyrka M, Matyja K, Moric I, Senerovic L, Trusek A. Functional Modification of Cellulose Acetate Microfiltration Membranes by Supercritical Solvent Impregnation. Molecules 2021; 26:E411. [PMID: 33466808 PMCID: PMC7831027 DOI: 10.3390/molecules26020411] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 01/10/2021] [Accepted: 01/11/2021] [Indexed: 12/11/2022] Open
Abstract
This study investigates the modification of commercial cellulose acetate microfiltration membranes by supercritical solvent impregnation with thymol to provide them with antibacterial properties. The impregnation process was conducted in a batch mode, and the effect of pressure and processing time on thymol loading was followed. The impact of the modification on the membrane's microstructure was analyzed using scanning electron and ion-beam microscopy, and membranes' functionality was tested in a cross-flow filtration system. The antibiofilm properties of the obtained materials were studied against Staphyloccocus aureus and Pseudomonas aeruginosa, while membranes' blocking in contact with bacteria was examined for S. aureus and Escherichia coli. The results revealed a fast impregnation process with high thymol loadings achievable after just 0.5 h at 15 MPa and 20 MPa. The presence of 20% of thymol provided strong antibiofilm properties against the tested strains without affecting the membrane's functionality. The study showed that these strong antibacterial properties could be implemented to the commercial membranes' defined polymeric structure in a short and environmentally friendly process.
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Affiliation(s)
- Irena Zizovic
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland; (M.T.); (K.M.); (A.T.)
| | - Marcin Tyrka
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland; (M.T.); (K.M.); (A.T.)
| | - Konrad Matyja
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland; (M.T.); (K.M.); (A.T.)
| | - Ivana Moric
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11010 Belgrade, Serbia; (I.M.); (L.S.)
| | - Lidija Senerovic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11010 Belgrade, Serbia; (I.M.); (L.S.)
| | - Anna Trusek
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland; (M.T.); (K.M.); (A.T.)
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17
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Hammond K, Benn G, Bennett I, Parsons ES, Ryadnov MG, Hoogenboom BW, Pyne ALB. Imaging the Effects of Peptide Materials on Phospholipid Membranes by Atomic Force Microscopy. Methods Mol Biol 2021; 2208:225-235. [PMID: 32856266 DOI: 10.1007/978-1-0716-0928-6_15] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Recent advances in biomolecular design require accurate measurements performed in native or near-native environments in real time. Atomic force microscopy (AFM) is a powerful tool to observe the dynamics of biologically relevant processes at aqueous interfaces with high spatial resolution. Here, we describe imaging protocols to characterize the effects of peptide materials on phospholipid membranes in solution by AFM. These protocols can be used to determine the mechanism and kinetics of membrane-associated activities at the nanoscale.
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Affiliation(s)
- Katharine Hammond
- London Centre for Nanotechnology, University College London, London, UK
- National Physical Laboratory, Teddington, UK
- Department of Physics and Astronomy, University College London, London, UK
| | - Georgina Benn
- London Centre for Nanotechnology, University College London, London, UK
- National Physical Laboratory, Teddington, UK
- Institute of Structural and Molecular Biology, University College London, London, UK
| | - Isabel Bennett
- London Centre for Nanotechnology, University College London, London, UK
| | - Edward S Parsons
- London Centre for Nanotechnology, University College London, London, UK
| | | | - Bart W Hoogenboom
- London Centre for Nanotechnology, University College London, London, UK
- Institute of Structural and Molecular Biology, University College London, London, UK
- Department of Physics and Astronomy, University College London, London, UK
| | - Alice L B Pyne
- London Centre for Nanotechnology, University College London, London, UK.
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK.
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18
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Liu CJ, Strathmann TJ, Bellona C. Rejection of per- and polyfluoroalkyl substances (PFASs) in aqueous film-forming foam by high-pressure membranes. Water Res 2021; 188:116546. [PMID: 33125991 DOI: 10.1016/j.watres.2020.116546] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 10/15/2020] [Accepted: 10/20/2020] [Indexed: 06/11/2023]
Abstract
The ubiquitous use and manufacturing of per- and polyfluoroalkyl substances (PFASs) have led to the contamination of water resources worldwide. High-pressure membranes, including nanofiltration (NF) and reverse osmosis (RO), are increasingly being deployed for water treatment and may be an effective barrier to PFASs. However, the impact of membrane operating conditions, background water matrix, and solute adsorption on rejection of diverse PFASs by NF and RO remains unclear. Rejection of perfluoroalkyl acids (PFAAs) present in aqueous film-forming foam (AFFF) diluted into a laboratory electrolyte matrix by NF and RO spiral wound elements was >98% and >99%, respectively. Rejection of the same PFAAs present in an AFFF-impacted groundwater matrix by NF was lower, between 92-98%, and was attributed to background water matrix constituents. Operating conditions did not have a significant impact on rejection of PFASs with the exception of shorter chain perfluoroalkyl sulfonic acids (PFSAs) in the AFFF-impacted groundwater matrix, where rejection increased with increasing flux. Structure-activity analysis of 42 PFASs, including 10 PFAAs and 32 PFASs identified in AFFF through high-resolution mass spectrometry suspect screening methods, showed some correlation between rejection and compound molecular weight. Adsorptive losses of PFAAs, most notably longer-chain hydrophobic PFAAs, to the spiral wound membrane elements and the membrane system were observed. Adsorption of PFAAs to the permeate spacer was especially pronounced and may have implications of artificially high rejection values. Still, rejection of PFASs by NF remained consistently >98% over 13 days of continuous operation.
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Affiliation(s)
- Charlie J Liu
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, Colorado 80401, United States.
| | - Timothy J Strathmann
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, Colorado 80401, United States.
| | - Christopher Bellona
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, Colorado 80401, United States.
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19
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Elshaarawy RFM, Abd El-Aal RM, Mustafa FHA, Borai AE, Schmidt S, Janiak C. Dual ionic liquid-based crosslinked chitosan for fine-tuning of antifouling, water throughput, and denitrification performance of polysulfone membrane. Int J Biol Macromol 2020; 170:572-582. [PMID: 33385455 DOI: 10.1016/j.ijbiomac.2020.12.186] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/13/2020] [Accepted: 12/23/2020] [Indexed: 11/17/2022]
Abstract
This study aimed to design a facile and efficient protocol for upgrading the performance indices of polysulfone (PS) membrane (porosity, hydrophilicity, pure water flux (PWF), surface charge, and fouling-resistance) by blending with newly synthesized poly(ionic) crosslinked chitosan Schiff bases (PICCSBs). The PS-PICCSBs mixed-matrix membranes (MMMs) have successfully fabricated and characterized based on spectral and microscopic analyses, porosity, zeta potential, water contact angle, and water uptake (wettability) measurements. The PWF, fouling-resistance against bovine serum albumin (BSA), as well as ion exchange capacity (IEC) against nitrate anion were studied. The wettability, hydrophilicity and overall porosity of new MMMs have greatly increased, in comparison to a pristine PS membrane (M0). In addition, blending of PS with PICCSBs resulted in switching its surface from negatively- to positively-charged. The PWF of MMMs has increased to reach a maximum value of 238.6 L/m2 h for MMM1 (9.3-fold higher than M0). Meanwhile, BSA rejection has declined from 96.62% for M0 to 41.9% for MMM1. The fouling parameters results of MMMs indicated their low fouling propensity. The IEC of nitrate anions revealed that the nitrate uptake by MMM1 is higher than that for M0 and MMM2 by 34% and 14%, respectively.
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Affiliation(s)
- Reda F M Elshaarawy
- Faculty of Science, Suez University, Suez, Egypt; Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine Universität Düsseldorf, 40204 Düsseldorf, Germany.
| | | | - Fatma H A Mustafa
- Marine Chemistry Laboratory, Marine Environment Division, National Institute of Oceanography and Fisheries (NIOF), Suez, Egypt
| | | | - Stephan Schmidt
- Department of Colloidal Adhesion, Organic and Macromolecular Chemistry Institute, Heinrich-Heine Universität Düsseldorf, 40225 Düsseldorf, Germany
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine Universität Düsseldorf, 40204 Düsseldorf, Germany
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20
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Doucette KA, Chaiyasit P, Calkins DL, Martinez KN, Van Cleave C, Knebel CA, Tongraar A, Crans DC. The Interfacial Interactions of Glycine and Short Glycine Peptides in Model Membrane Systems. Int J Mol Sci 2020; 22:ijms22010162. [PMID: 33375246 PMCID: PMC7795424 DOI: 10.3390/ijms22010162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/19/2020] [Accepted: 12/22/2020] [Indexed: 12/20/2022] Open
Abstract
The interactions of amino acids and peptides at model membrane interfaces have considerable implications for biological functions, with the ability to act as chemical messengers, hormones, neurotransmitters, and even as antibiotics and anticancer agents. In this study, glycine and the short glycine peptides diglycine, triglycine, and tetraglycine are studied with regards to their interactions at the model membrane interface of Aerosol-OT (AOT) reverse micelles via 1H NMR spectroscopy, dynamic light scattering (DLS), and Langmuir trough measurements. It was found that with the exception of monomeric glycine, the peptides prefer to associate between the interface and bulk water pool of the reverse micelle. Monomeric glycine, however, resides with the N-terminus in the ordered interstitial water (stern layer) and the C-terminus located in the bulk water pool of the reverse micelle.
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Affiliation(s)
- Kaitlin A. Doucette
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA;
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Prangthong Chaiyasit
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; (P.C.); (A.T.)
| | - Donn L. Calkins
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Kayli N. Martinez
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Cameron Van Cleave
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Callan A. Knebel
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
| | - Anan Tongraar
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; (P.C.); (A.T.)
| | - Debbie C. Crans
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA;
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (D.L.C.); (K.N.M.); (C.V.C.); (C.A.K.)
- Correspondence: ; Tel.: +1-970-491-7635
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21
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Tran LT, Do AT, Pham TH, Nguyen KT, Duong HC. Decentralised, small-scale coagulation-membrane treatment of wastewater from metal recycling villages - a case study from Vietnam. Water Sci Technol 2020; 82:2125-2133. [PMID: 33263589 DOI: 10.2166/wst.2020.493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Effective treatment of wastewaters laden with heavy metals is critical to the sustainable social and economic growth of metal recycling villages in Vietnam. Currently, most wastewaters from metal recycling villages in Vietnam are directly discharged, posing great threats to the environment and human health. In this study, a small-scale combined coagulation-membrane filtration treatment of wastewater collected from a metal recycling village in Vietnam was experimentally investigated. The experimental results manifested the technical viability of the combined coagulation-membrane filtration process for the treatment of the heavily polluted metal recycling wastewater for beneficial reuse. In this combined treatment process, coagulation using ferric chloride (FeCl2) served as a pre-treatment prior to the microfiltration (MF)/reverse osmosis (RO) process. Under the optimised conditions, coagulation at the dosage of 0.2 g FeCl2 per 1,000 ml wastewater removed more than 90% of heavy metals (i.e. most notably including aluminium and chromium) from the wastewater, reducing the aluminium and chromium concentrations in the wastewater from 548.0 to 52.3 mg/L to 32.6 and 1.7 mg/L, respectively. The MF treatment of the wastewater following the coagulation further removed suspended solids and organic matters, rendering the wastewater safe for the subsequent RO filtration with respect to membrane fouling. Given the efficient pre-treatment of coagulation and MF, the RO process at the controlled water recovery of 50% was able to effectively treat the wastewater to potable water.
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Affiliation(s)
- Lan Thu Tran
- Institute of Environmental Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Anh Tien Do
- Vietnam Meteorological and Hydrological Administration, Hanoi, Vietnam
| | - Tuan Hung Pham
- Vietnam National University of Civil Engineering, Hanoi, Vietnam
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22
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Levin I, Deegan R, Sharon E. Self-Oscillating Membranes: Chemomechanical Sheets Show Autonomous Periodic Shape Transformation. Phys Rev Lett 2020; 125:178001. [PMID: 33156660 DOI: 10.1103/physrevlett.125.178001] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 06/24/2020] [Accepted: 09/22/2020] [Indexed: 06/11/2023]
Abstract
While living organisms have mastered the dynamic control of residual stresses within sheets to induce shape transformation and locomotion, man-made implementations are rudimentary. We present the first autonomously shape-shifting sheets made of a gel that shrinks and swells in response to the phase of an oscillatory chemical (Belousov-Zhabotinsky) reaction. Propagating reaction-diffusion fronts induce localized deformation of the gel. We show that these localized deformations prescribe a spatiotemporal pattern of Gaussian curvature, leading to time-periodic global shape changes. We present the computational tools and experimental protocols needed to control this system, principally the relationship between the Gaussian curvature and the reaction phase, and optical imprinting of the wave pattern. Together, our results demonstrate a route for developing fully autonomous soft machines mimicking some of the locomotive capabilities of living organisms.
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Affiliation(s)
- Ido Levin
- Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
| | - Robert Deegan
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Eran Sharon
- Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
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23
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Acebrón I, Righetto RD, Schoenherr C, de Buhr S, Redondo P, Culley J, Rodríguez CF, Daday C, Biyani N, Llorca O, Byron A, Chami M, Gräter F, Boskovic J, Frame MC, Stahlberg H, Lietha D. Structural basis of Focal Adhesion Kinase activation on lipid membranes. EMBO J 2020; 39:e104743. [PMID: 32779739 PMCID: PMC7527928 DOI: 10.15252/embj.2020104743] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 07/01/2020] [Accepted: 07/10/2020] [Indexed: 12/13/2022] Open
Abstract
Focal adhesion kinase (FAK) is a key component of the membrane proximal signaling layer in focal adhesion complexes, regulating important cellular processes, including cell migration, proliferation, and survival. In the cytosol, FAK adopts an autoinhibited state but is activated upon recruitment into focal adhesions, yet how this occurs or what induces structural changes is unknown. Here, we employ cryo-electron microscopy to reveal how FAK associates with lipid membranes and how membrane interactions unlock FAK autoinhibition to promote activation. Intriguingly, initial binding of FAK to the membrane causes steric clashes that release the kinase domain from autoinhibition, allowing it to undergo a large conformational change and interact itself with the membrane in an orientation that places the active site toward the membrane. In this conformation, the autophosphorylation site is exposed and multiple interfaces align to promote FAK oligomerization on the membrane. We show that interfaces responsible for initial dimerization and membrane attachment are essential for FAK autophosphorylation and resulting cellular activity including cancer cell invasion, while stable FAK oligomerization appears to be needed for optimal cancer cell proliferation in an anchorage-independent manner. Together, our data provide structural details of a key membrane bound state of FAK that is primed for efficient autophosphorylation and activation, hence revealing the critical event in integrin mediated FAK activation and signaling at focal adhesions.
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Affiliation(s)
- Iván Acebrón
- Structural Biology ProgrammeSpanish National Cancer Research CentreMadridSpain
| | - Ricardo D Righetto
- Center for Cellular Imaging and NanoAnalyticsBiozentrumUniversity of BaselBaselSwitzerland
| | - Christina Schoenherr
- Cancer Research UK Edinburgh CentreInstitute of Genetics and Molecular MedicineUniversity of EdinburghEdinburghUK
| | - Svenja de Buhr
- Heidelberg Institute for Theoretical StudiesHeidelbergGermany
- Interdisciplinary Center for Scientific ComputingHeidelberg UniversityHeidelbergGermany
| | - Pilar Redondo
- Structural Biology ProgrammeSpanish National Cancer Research CentreMadridSpain
| | - Jayne Culley
- Cancer Research UK Edinburgh CentreInstitute of Genetics and Molecular MedicineUniversity of EdinburghEdinburghUK
| | - Carlos F Rodríguez
- Structural Biology ProgrammeSpanish National Cancer Research CentreMadridSpain
| | - Csaba Daday
- Heidelberg Institute for Theoretical StudiesHeidelbergGermany
- Interdisciplinary Center for Scientific ComputingHeidelberg UniversityHeidelbergGermany
| | - Nikhil Biyani
- Center for Cellular Imaging and NanoAnalyticsBiozentrumUniversity of BaselBaselSwitzerland
| | - Oscar Llorca
- Structural Biology ProgrammeSpanish National Cancer Research CentreMadridSpain
| | - Adam Byron
- Cancer Research UK Edinburgh CentreInstitute of Genetics and Molecular MedicineUniversity of EdinburghEdinburghUK
| | - Mohamed Chami
- Center for Cellular Imaging and NanoAnalyticsBiozentrumUniversity of BaselBaselSwitzerland
| | - Frauke Gräter
- Heidelberg Institute for Theoretical StudiesHeidelbergGermany
- Interdisciplinary Center for Scientific ComputingHeidelberg UniversityHeidelbergGermany
| | - Jasminka Boskovic
- Structural Biology ProgrammeSpanish National Cancer Research CentreMadridSpain
| | - Margaret C Frame
- Cancer Research UK Edinburgh CentreInstitute of Genetics and Molecular MedicineUniversity of EdinburghEdinburghUK
| | - Henning Stahlberg
- Center for Cellular Imaging and NanoAnalyticsBiozentrumUniversity of BaselBaselSwitzerland
| | - Daniel Lietha
- Structural Biology ProgrammeSpanish National Cancer Research CentreMadridSpain
- Centro de Investigaciones Biológicas Margarita SalasSpanish National Research Council (CSIC)MadridSpain
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24
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Schiffbauer J, Demekhin E, Ganchenko G. Transitions and Instabilities in Imperfect Ion-Selective Membranes. Int J Mol Sci 2020; 21:ijms21186526. [PMID: 32906711 PMCID: PMC7554848 DOI: 10.3390/ijms21186526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/31/2020] [Accepted: 09/02/2020] [Indexed: 11/16/2022] Open
Abstract
Numerical investigation of the underlimiting, limiting, and overlimiting current modes and their transitions in imperfect ion-selective membranes with fluid flow through permitted through the membrane is presented. The system is treated as a three layer composite system of electrolyte-porous membrane-electrolyte where the Nernst–Planck–Poisson–Stokes system of equations is used in the electrolyte, and the Darcy–Brinkman approach is employed in the nanoporous membrane. In order to resolve thin Debye and Darcy layers, quasi-spectral methods are applied using Chebyshev polynomials for their accumulation of zeros and, hence, best resolution in the layers. The boundary between underlimiting and overlimiting current regimes is subject of linear stability analysis, where the transition to overlimiting current is assumed due to the electrokinetic instability of the one-dimensional quiescent state. However, the well-developed overlimiting current is inherently a problem of nonlinear stability and is subject of the direct numerical simulation of the full system of equations. Both high and low fixed charge density membranes (low- and high concentration electrolyte solutions), acting respectively as (nearly) perfect or imperfect membranes, are considered. The perfect membrane is adequately described by a one-layer model while the imperfect membrane has a more sophisticated response. In particular, the direct transition from underlimiting to overlimiting currents, bypassing the limiting currents, is found to be possible for imperfect membranes (high-concentration electrolyte). The transition to the overlimiting currents for the low-concentration electrolyte solutions is monotonic, while for the high-concentration solutions it is oscillatory. Despite the fact that velocities in the porous membrane are much smaller than in the electrolyte region, it is further demonstrated that they can dramatically influence the nature and transition to the overlimiting regimes. A map of the bifurcations, transitions, and regimes is constructed in coordinates of the fixed membrane charge and the Darcy number.
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Affiliation(s)
- Jarrod Schiffbauer
- Department of Physical and Environmental Sciences, Colorado Mesa University, Grand Junction, CO 81501, USA;
| | - Evgeny Demekhin
- Department of Mathematics and Computer Science, Financial University, 350051 Krasnodar, Russia
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University, 350051 Krasnodar, Russia;
- Laboratory of General Aeromechanics, Institute of Mechanics, Moscow State University, 119192 Moscow, Russia
- Correspondence:
| | - Georgy Ganchenko
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University, 350051 Krasnodar, Russia;
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25
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Louf JF, Knoblauch J, Jensen KH. Bending and Stretching of Soft Pores Enable Passive Control of Fluid Flows. Phys Rev Lett 2020; 125:098101. [PMID: 32915604 DOI: 10.1103/physrevlett.125.098101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
Programmable valves and actuators are widely used in man-made systems to provide sophisticated control of fluid flows. In nature, however, this process is frequently achieved using passive soft materials. Here we study how elastic deformations of cylindrical pores embedded in a flexible membrane enable passive flow control. We develop biomimetic valves with variable pore radius, membrane radius, and thickness. Our experiments reveal a mechanism where small deformations bend the membrane and constrict the pore-thus reducing flow-while larger deformations stretch the membrane, expand the pore, and enhance flow. We develop a theory capturing this highly nonmonotonic behavior, and validate the scaling across a broad range of material and geometric parameters. Our results suggest that intercompartmental flow control in living systems can be encoded entirely in the physical attributes of soft materials. Moreover, this design could enable autonomous flow control in man-made systems.
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Affiliation(s)
- Jean-François Louf
- Department of Physics, Technical University of Denmark, DK-2800 Kgs, Lyngby, Denmark
| | - Jan Knoblauch
- Department of Physics, Technical University of Denmark, DK-2800 Kgs, Lyngby, Denmark
| | - Kaare H Jensen
- Department of Physics, Technical University of Denmark, DK-2800 Kgs, Lyngby, Denmark
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26
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Rideau E, Wurm FR, Landfester K. Membrane Engineering: Phase Separation in Polymeric Giant Vesicles. Small 2020; 16:e1905230. [PMID: 32468728 DOI: 10.1002/smll.201905230] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 04/21/2020] [Accepted: 04/23/2020] [Indexed: 06/11/2023]
Abstract
Cell membranes exhibit elaborate lipidic patterning to carry out a myriad of functions such as signaling and trafficking. Domain formation in giant unilamellar vesicles (GUVs) is thus of interest for understanding fundamental biological processes and to provide new prospects for biocompatible soft materials. Lipid rearrangements in lipidic GUVs and lipid/polymer GUVs are extensively studied whereas polymer/polymer hybrid GUVs remain evasive. Here, the focus is on the thermodynamically driven phase separation of amphiphilic polymers in GUVs. It is demonstrated that polymer phase separation is entropically dictated by hydrophobic block incompatibilities and that films topology can help to determine the outcome of polymeric phase separation in GUVs. Lastly, Janus-GUVs are obtained and GUVs exhibit a single large domain by using a compatibilizing hydrophobic block copolymer.
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Affiliation(s)
- Emeline Rideau
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, 55128, Germany
| | - Frederik R Wurm
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, 55128, Germany
| | - Katharina Landfester
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, 55128, Germany
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27
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Chao MD, Donaldson EA, Wu W, Welter AA, O'Quinn TG, Hsu WW, Schulte MD, Lonergan SM. Characterizing membrane phospholipid hydrolysis of pork loins throughout three aging periods. Meat Sci 2020; 163:108065. [PMID: 31986363 DOI: 10.1016/j.meatsci.2020.108065] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 01/20/2020] [Accepted: 01/20/2020] [Indexed: 12/19/2022]
Abstract
Three chops from 20 pork carcasses were aged for 1, 8, and 21 days. Electrospray ionization-tandem mass spectrometry was used to comprehensively analyze profiles of phospholipids from each sample (n = 60). Total phospholipid quantity decreased 4-folds (P < .01) from 1 to 21 days of aging in pork loins. Phosphatidylinositol (PI) and phosphatidylserine (PS) increased by 30% and 73%, respectively, from 1 to 21 days of aging in pork loins (P < .01). This increase was mainly due to relative percentage increase from PI 38:4 (18:0-20:4) and PS 36:2 (18:0-18:2; P < .01). The results also showed that the relative percentage of lysophosphatidylcholine increased by 35% after short term aging (8d), and phosphatidic acid increased by 10-folds after extended aging (21d; P < .01). These results documented that phospholipids undergo enzymatic hydrolysis during aging, but also indicated that lipid species containing 18:2 or 20:4 within PI and PS were slightly more resistant to enzymatic hydrolysis compared with the other phospholipids.
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Affiliation(s)
- M D Chao
- Kansas State University, Department of Animal Sciences and Industry, Manhattan, Kansas 66506, USA.
| | - E A Donaldson
- Kansas State University, Department of Animal Sciences and Industry, Manhattan, Kansas 66506, USA
| | - W Wu
- Kansas State University, Department of Animal Sciences and Industry, Manhattan, Kansas 66506, USA
| | - A A Welter
- Kansas State University, Department of Animal Sciences and Industry, Manhattan, Kansas 66506, USA
| | - T G O'Quinn
- Kansas State University, Department of Animal Sciences and Industry, Manhattan, Kansas 66506, USA
| | - W-W Hsu
- Kansas State University, Department of Statistics, Manhattan, Kansas 66506, USA
| | - M D Schulte
- Iowa State University, Department of Animal Science, Ames, Iowa 50011, USA
| | - S M Lonergan
- Iowa State University, Department of Animal Science, Ames, Iowa 50011, USA
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28
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Ali E, Orfi J, Najib A. Developing and validating a dynamic model of water production by direct-contact membrane distillation. PLoS One 2020; 15:e0230207. [PMID: 32208423 PMCID: PMC7092998 DOI: 10.1371/journal.pone.0230207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 02/24/2020] [Indexed: 11/18/2022] Open
Abstract
We consider the development and fitting of a dynamic model for desalinated water production by a direct-contact membrane distillation (DCMD) unit. Two types of dynamic-model structures, namely, lumped parameter and spatial, were evaluated. Both the models were validated using experimental response data generated by step testing the inlet hot stream temperature of a DCMD pilot plant. Both the model structures failed to follow the dynamic response adequately. However, a modification of the model by adding a heat loss term resulted in enhanced predictions for both model structures. The overall relative error in the model–plant mismatch was approximately 3%. This is reasonable considering the random uncertainties associated with the plant operation. This observation also improves our understanding of the importance of using better correlations for heat-transfer coefficients, to develop a more reliable and accurate predictive model for a wide range of operating conditions.
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Affiliation(s)
- Emad Ali
- Department of Chemical Engineering, King Saud University, Riyadh, Saudi Arabia
- * E-mail:
| | - Jamel Orfi
- Department of Mechanical Engineering, King Saud University, Riyadh, Saudi Arabia
| | - Abdullah Najib
- Department of Mechanical Engineering, King Saud University, Riyadh, Saudi Arabia
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29
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Zhou YM, Liu XC, Li YQ, Wang P, Han RM, Zhang JP, Skibsted LH. Synergy between plant phenols and carotenoids in stabilizing lipid-bilayer membranes of giant unilamellar vesicles against oxidative destruction. Soft Matter 2020; 16:1792-1800. [PMID: 31970380 DOI: 10.1039/c9sm01415b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We have investigated the synergism between plant phenols and carotenoids in protecting the phosphatidylcholine (PC) membranes of giant unilamellar vesicles (GUVs) from oxidative destruction, for which chlorophyll-a (Chl-a) was used as a lipophilic photosensitizer. The effect was examined for seven different combinations of β-carotene (β-CAR) and plant phenols. The light-induced change in GUV morphology was monitored via conventional optical microscopy, and quantified by a dimensionless image-entropy parameter, ΔE. The ΔE-t time evolution profiles exhibiting successive lag phase, budding phase and ending phase could be accounted for by a Boltzmann model function. The length of the lag phase (LP in s) for the combination of syringic acid and β-CAR was more than seven fold longer than for β-CAR alone, and those for other different combinations followed the order: salicylic acid < vanillic acid < syringic acid > rutin > caffeic acid > quercetin > catechin, indicating that moderately reducing phenols appeared to be the most efficient membrane co-stabilizers. The same order held for the residual contents of β-CAR in membranes after light-induced oxidative degradation as determined by resonance Raman spectroscopy. The dependence of LP on the reducing power of phenols coincided with the Marcus theory plot for the rate of electron transfer from phenols to the radical cation β-CAR˙+ as a primary oxidative product, suggesting that the plant phenol regeneration of β-CAR plays an important role in stabilizing the GUV membranes, as further supported by the involvement of CAR˙+ and the distinct shortening of its lifetime as shown by transient absorption spectroscopy.
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Affiliation(s)
- Yi-Ming Zhou
- Department of Chemistry, Renmin University of China, Beijing, 100872, China.
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30
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Kaneshige Y, Hayashi F, Morigaki K, Tanimoto Y, Yamashita H, Fujii M, Awazu A. Affinity of rhodopsin to raft enables the aligned oligomer formation from dimers: Coarse-grained molecular dynamics simulation of disk membranes. PLoS One 2020; 15:e0226123. [PMID: 32032370 PMCID: PMC7006936 DOI: 10.1371/journal.pone.0226123] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 01/13/2020] [Indexed: 12/16/2022] Open
Abstract
The visual photopigment protein rhodopsin (Rh) is a typical G protein-coupled receptor (GPCR) that initiates the phototransduction cascade in retinal disk membrane of rod-photoreceptor cells. Rh molecule has a tendency to form dimer, and the dimer tends to form rows, which is suggested to heighten phototransduction efficiency in single-photon regime. In addition, the dimerization confers Rh an affinity for lipid raft, i.e. raftophilicity. However, the mechanism by which Rh-dimer raftophilicity contributes to the organization of the higher order structure remains unknown. In this study, we performed coarse-grained molecular dynamics simulations of a disk membrane model containing unsaturated lipids, saturated lipids with cholesterol, and Rh-dimers. We described the Rh-dimers by two-dimensional particle populations where the palmitoyl moieties of each Rh exhibits raftophilicity. We simulated the structuring of Rh in a disk for two types of Rh-dimer, i.e., the most and second most stable Rh dimers, which exposes the raftophilic regions at the dimerization-interface (H1/H8 dimer) and two edges away from the interface (H4/H5 dimer), respectively. Our simulations revealed that only the H1/H8 dimer could form a row structure. A small number of raftophilic lipids recruited to and intercalated in a narrow space between H1/H8 dimers stabilize the side-by-side interaction between dimers in a row. Our results implicate that the nano-sized lipid raft domains act as a “glue” to organize the long row structures of Rh-dimers.
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Affiliation(s)
- Yukito Kaneshige
- Department of Mathematical and Life Sciences, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Japan
| | - Fumio Hayashi
- Graduate School of Science, Kobe University, Rokkodaicho, Nada, Kobe, Japan
| | - Kenichi Morigaki
- Biosignal Research Center, Kobe University, Rokkodaicho, Nada, Kobe, Japan
| | - Yasushi Tanimoto
- Graduate School of Science, Kobe University, Rokkodaicho, Nada, Kobe, Japan
| | - Hayato Yamashita
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan
| | - Masashi Fujii
- Department of Mathematical and Life Sciences, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Japan
| | - Akinori Awazu
- Department of Mathematical and Life Sciences, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Japan
- * E-mail:
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31
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Tang X, Zhang S, Zhou H, Zhou B, Liu S, Yang Z. The role of electrostatic potential polarization in the translocation of graphene quantum dots across membranes. Nanoscale 2020; 12:2732-2739. [PMID: 31951244 DOI: 10.1039/c9nr09258g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Graphene quantum dots (GQDs) have shown promising potential applications in the field of biomedicine. To date, understanding the GQD-cell membrane interactions remains a key issue in developing their biomedical applications, such as targeted drug delivery and bio-imaging. In this study, we mainly shed light on the mechanism of how to control the interactions between GQDs and membranes by tuning the electrostatic potential (EP) of GQDs. Charge distributions at the edge sites were adjusted to mimic the modified EP of GQDs, given that the physicochemical properties of GQDs are usually regulated and determined by the grafted groups and doped atoms at edges. We found that the dynamics of GQDs in the GQD-membrane system can be regulated effectively by modulating the EP of GQDs, which is not only determined by the direct GQD-cell interactions but also by the GQD-water interactions. GQDs with non- or less-polarized EP are hydrophobic, and they can easily translocate into the inner membrane from the bulk water because of the decreased GQD-POPC van der Waals interactions and the favorable dehydration process. In the case of a GQD with more polarized EP, the nanomaterial prefers to adsorb onto the membrane surface due to the strong electrostatic attraction between the GQD and lipid headgroups, and especially, the high dehydration free energy of GQDs can even lead to transient detachment from the surface. These findings would be helpful to understand the interactions between GQD-based nanomaterials and cell membranes, facilitating the rational design of GQD-related biomedicines.
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Affiliation(s)
- Xiaofeng Tang
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Shitong Zhang
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Hong Zhou
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Bo Zhou
- School of Electronic Engineering, Chengdu Technological University, Chengdu 611730, China
| | - Shengtang Liu
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Zaixing Yang
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
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32
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Du X, Song Y, Xuan X, Chen S, Wu X, Jiang HB, Lee ES, Wang X. Characterization of a Bioresorbable Magnesium-Reinforced PLA-Integrated GTR/GBR Membrane as Dental Applications. Scanning 2020; 2020:6743195. [PMID: 33024479 PMCID: PMC7520691 DOI: 10.1155/2020/6743195] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 07/27/2020] [Accepted: 08/17/2020] [Indexed: 05/03/2023]
Abstract
Inferior mechanical properties have always been a limitation of the bioresorbable membranes in GBR/GTR. This study is aimed at fabricating a bioresorbable magnesium-reinforced polylactic acid- (PLA-) integrated membrane and investigating its mechanical properties, degradation rate, and biocompatibility. The uncoated and fluoride-coated magnesium alloys, AZ91, were made into strips. Then, magnesium-reinforced PLA-integrated membrane was made through integration. PLA strips were used in the control group instead of magnesium strips. Specimens were cut into rectangular shape and immersed in Hank's Balanced Salt Solution (HBSS) at 37°C for 4, 8, and 12 d. The weight loss of the AZ91 strips was measured. Three-point bending tests were conducted before and after the immersion to determine the maximum load on specimens. Potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) were conducted on coated and uncoated AZ91 plates to examine corrosion resistance. Murine fibroblast and osteoblast cells were cultured on circular specimens and titanium disks for 1, 3, and 5 d. Thereafter, WST test was performed to examine cell proliferation. As a result, the coated and uncoated groups showed higher maximum loads than the control group at all time points. The weight loss of AZ91 strips used in the coated group was lower than that in the uncoated group. PDP, EIS, SEM, and EDS showed that the coated AZ91 had a better corrosion resistance than the uncoated AZ91. The cell proliferation test showed that the addition of AZ91 did not have an adverse effect on osteoblast cells. Conclusively, the magnesium-reinforced PLA-integrated membrane has excellent load capacity, corrosion resistance, cell affinity, and proper degradation rate. Moreover, it has great potential as a bioresorbable membrane in the GBR/GTR application.
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Affiliation(s)
- Xin Du
- Stomatological Materials Laboratory, School of Stomatology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, Shandong 271016, China
| | - Yahui Song
- Stomatological Materials Laboratory, School of Stomatology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, Shandong 271016, China
| | - Xinxin Xuan
- Stomatological Materials Laboratory, School of Stomatology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, Shandong 271016, China
| | - Shuzhen Chen
- Stomatological Materials Laboratory, School of Stomatology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, Shandong 271016, China
| | - Xia Wu
- Jinan Stomatological Hospital, Jinan, Shandong 250001, China
| | - Heng Bo Jiang
- Stomatological Materials Laboratory, School of Stomatology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, Shandong 271016, China
| | - Eui-Seok Lee
- Department of Oral and Maxillofacial Surgery, Graduate School of Clinical Dentistry, Korea University Guro Hospital, Seoul 08308, Republic of Korea
| | - Xiaohui Wang
- Stomatological Materials Laboratory, School of Stomatology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, Shandong 271016, China
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Fahimipour F, Bastami F, Khoshzaban A, Jahangir S, Eslaminejad MB, Khayyatan F, Safiaghdam H, Sadooghi Y, Safa M, Jafarzadeh Kashi TS, Dashtimoghadam E, Tayebi L. Critical-sized bone defects regeneration using a bone-inspired 3D bilayer collagen membrane in combination with leukocyte and platelet-rich fibrin membrane (L-PRF): An in vivo study. Tissue Cell 2019; 63:101326. [PMID: 32223953 DOI: 10.1016/j.tice.2019.101326] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 12/16/2019] [Accepted: 12/16/2019] [Indexed: 11/18/2022]
Abstract
OBJECTIVES We aim to develop a 3D-bilayer collagen (COL) membrane reinforced with nano beta-tricalcium-phosphate (nβ-TCP) particles and to evaluate its bone regeneration in combination with leukocyte-platelet-rich fibrin (L-PRF) in vivo. BACKGROUND DATA L-PRF has exhibited promising results as a cell carrier in bone regeneration in a number of clinical studies, however there are some studies that did not confirm the positive results of L-PRF application. METHODS Mechanical & physiochemical characteristics of the COL/nβ-TCP membrane (1/2 & 1/4) were tested. Proliferation and osteogenic differentiation of seeded cells on bilayer collagen/nβ-TCP thick membrane was examined. Then, critical-sized calvarial defects in 8 white New Zealand rabbits were filled with either Col, Col/nβ-TCP, Col/nβ-TCP combined with L-PRF membrane, or left empty. New bone formation (NBF) was measured histomorphometrically 4 & 8 weeks postoperatively. RESULTS Compressive modulus increases while porosity decreases with higher β-TCP concentrations. Mechanical properties improve, with 89 % porosity (pore size ∼100 μm) in the bilayer-collagen/nβ-TCP membrane. The bilayer design also enhances the proliferation and ALP activity. In vivo study shows no significant difference among test groups at 4 weeks, but Col/nβ-TCP + L-PRF demonstrates more NBF compared to others (P < 0.05) after 8 weeks. CONCLUSION The bilayer-collagen/nβ-TCP thick membrane shows promising physiochemical in vitro results and significant NBF, as ¾ of the defect is filled with lamellar bone when combined with L-PRF membrane.
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Affiliation(s)
- Farahnaz Fahimipour
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Marquette University School of Dentistry, Milwaukee, WI 53233, USA; Department of Chemistry, University of North Carolina at Chapel Hill, NC, USA
| | - Farshid Bastami
- Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Oral and Maxillofacial Surgery Department, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ahad Khoshzaban
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Iranian Tissue Bank and Research Center, Imam Khomeini Medical Complex Hospital, Tehran University of Medical Sciences, Tehran, Iran; Arcazistsazeh Research Center& Industry complex, Tehran, Iran
| | - Shahrbanoo Jahangir
- Department of Tissue Engineering and Regenerative Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran; Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Mohamadreza Baghaban Eslaminejad
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Fahimeh Khayyatan
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Hannaneh Safiaghdam
- Students Research Committee, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Yeganeh Sadooghi
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Majid Safa
- Department of Tissue Engineering and Regenerative Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran; Department of Hematology and Blood Banking, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Tahereh S Jafarzadeh Kashi
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Iranian Tissue Bank and Research Center, Imam Khomeini Medical Complex Hospital, Tehran University of Medical Sciences, Tehran, Iran.
| | - Erfan Dashtimoghadam
- Marquette University School of Dentistry, Milwaukee, WI 53233, USA; Department of Chemistry, University of North Carolina at Chapel Hill, NC, USA
| | - Lobat Tayebi
- Marquette University School of Dentistry, Milwaukee, WI 53233, USA
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Rantamäki AH, Chen W, Hyväri P, Helminen J, Partl G, King AWT, Wiedmer SK. Interactions of Ionic Liquids and Spirocyclic Compounds with Liposome Model Membranes. A Steady-State Fluorescence Anisotropy Study. Sci Rep 2019; 9:18349. [PMID: 31797938 PMCID: PMC6892914 DOI: 10.1038/s41598-019-53893-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 11/05/2019] [Indexed: 02/08/2023] Open
Abstract
Understanding the toxicity of ionic liquids (ILs) is crucial in the search of greener chemicals. By comparing in vivo toxicity and in vitro interactions determined between compounds and biomimetic lipid membranes, more detailed toxicity vs. structure relation can be obtained. However, determining the interactions between non-surface-active compounds and liposomes has been a challenging task. Organisational changes induced by ILs and IL-like spirocyclic compounds within 1,6-diphenyl-1,3,5-hexatriene-doped biomimetic liposomes was studied by steady-state fluorescence anisotropy technique. The extent of organisational changes detected within the liposome bilayers were compared to the toxicity of the compounds determined using Vibrio Fischeri bacteria. Four liposome compositions made of pure 1-palmitoyl-2-oleyl-sn-glycero-3-phosphocoline (POPC) and mixtures of POPC, 1-palmitoyl-2-oleyl-sn-glycero-3-phosphoserine (POPS), and cholesterol (Chol) were tested as biomimetic models. Changes observed within the POPC/POPS/Chol 55:20:25 bilayers correlated the best with the toxicity results: ten out of twelve compounds followed the trend of increasing bilayer disorder - increasing toxicity. The study suggests that the toxicity of non-surface-active compounds is dependent on their ability to diffuse into the bilayers. The extent of bilayer's organisational changes correlates rather well with the toxicity of the compounds. Highly sensitive technique, such as fluorescence anisotropy measurements, is needed for detecting subtle changes within the bilayer structures.
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Affiliation(s)
- Antti H Rantamäki
- Department of Chemistry, A.I. Virtasen aukio 1, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland.
| | - Wen Chen
- Department of Chemistry, A.I. Virtasen aukio 1, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland
| | - Paulus Hyväri
- Department of Chemistry, A.I. Virtasen aukio 1, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland
| | - Jussi Helminen
- Department of Chemistry, A.I. Virtasen aukio 1, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland
| | - Gabriel Partl
- Department of Chemistry, A.I. Virtasen aukio 1, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland
| | - Alistair W T King
- Department of Chemistry, A.I. Virtasen aukio 1, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland
| | - Susanne K Wiedmer
- Department of Chemistry, A.I. Virtasen aukio 1, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland.
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35
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Sproul GD. Membranes Composed of Lipopeptides and Liponucleobases Inspired Protolife Evolution. ORIGINS LIFE EVOL B 2019; 49:241-254. [PMID: 31883067 DOI: 10.1007/s11084-019-09587-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 10/21/2019] [Indexed: 11/30/2022]
Abstract
Amino acids and peptides have been demonstrated to form lipoamino acids and lipopeptides under presumed prebiotic conditions, and readily form liposomes. Of the common nucleobases, adenine forms a liponucleobase even below 100 °C. Adenine as well as other nucleobases can also be derivatized with ethylene carbonate (and likely other similar compounds) onto which fatty acids can be attached. The fatty acid tails along with appropriately functionalized nucleobases provide some solubility of liponucleobases in membranes. Such membranes would provide a structure in which three of biology's major components are closely associated and available for chemical interactions. Nucleobase-to-nucleobase interactions would ensure that the liponucleobases would have a uniquely different head-group relationship than other amphiphiles within a membrane, likely forming rafts due their π-π interactions and providing surface discontinuities that could serve as catalytic sites. The π-π bond distance in aromatic compounds is typically 0.34 nm, commensurate with that of the amine to carboxylate distance in alpha amino acids. This would have provided opportunity for hydrogen bonding between amino acids and the distal primary amines or tautomeric carbonyl/hydroxyl groups of two π-bonded nucleobases. Such bonding would weaken the covalent linkages within the amino acids, making them susceptible to forming peptide bonds with an adjacent amino acid, likely a lipoamino acid or lipopeptide. Were this second lipoamino acid bound to a third π-bonded nucleobase, it could result in orientation, destabilization and peptide formation. The stacked triplet of nucleobases might constitute the primordial codon triplet from which peptides were synthesized: primordial translation.
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Affiliation(s)
- Gordon D Sproul
- University of South Carolina Beaufort (USCB), One University Blvd, Bluffton, SC, 29909; 37 Barnwell Dr, Beaufort, SC, 29907, USA.
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36
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Boge L, Browning KL, Nordström R, Campana M, Damgaard LSE, Seth Caous J, Hellsing M, Ringstad L, Andersson M. Peptide-Loaded Cubosomes Functioning as an Antimicrobial Unit against Escherichia coli. ACS Appl Mater Interfaces 2019; 11:21314-21322. [PMID: 31120236 DOI: 10.1021/acsami.9b01826] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Dispersions of cubic liquid crystalline phases, also known as cubosomes, have shown great promise as delivery vehicles for a wide range of medicines. Due to their ordered structure, comprising alternating hydrophilic and hydrophobic domains, cubosomes possess unique delivery properties and compatibility with both water-soluble and -insoluble drugs. However, the drug delivery mechanism and cubosome interaction with human cells and bacteria are still poorly understood. Herein, we reveal how cubosomes loaded with the human cathelicidin antimicrobial peptide LL-37, a system with high bacteria-killing effect, interact with the bacterial membrane and provide new insights into the eradication mechanism. Combining the advanced experimental techniques neutron reflectivity and quartz crystal microbalance with dissipation monitoring, a mechanistic drug delivery model for LL-37-loaded cubosomes on bacterial mimicking bilayers was constructed. Moreover, the cubosome interaction with Escherichia coli was directly visualized using super-resolution laser scanning microscopy and cryogenic electron tomography. We could conclude that cubosomes loaded with LL-37 adsorbed and distorted bacterial membranes, providing evidence that the peptide-loaded cubosomes function as an antimicrobial unit.
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Affiliation(s)
- Lukas Boge
- RISE Research Institutes of Sweden , Borås 501 15 , Sweden
- Department of Chemistry and Chemical Engineering , Chalmers University of Technology , Göteborg 412 96 , Sweden
| | - Kathryn L Browning
- Department of Pharmacy , University of Copenhagen , København 2100 , Denmark
| | - Randi Nordström
- Department of Pharmacy , Uppsala University , Uppsala 751 23 , Sweden
| | - Mario Campana
- Rutherford Appleton Laboratory , Didcot OX11 0DE , United Kingdom
| | - Liv S E Damgaard
- Department of Pharmacy , University of Copenhagen , København 2100 , Denmark
| | | | - Maja Hellsing
- RISE Research Institutes of Sweden , Borås 501 15 , Sweden
| | | | - Martin Andersson
- Department of Chemistry and Chemical Engineering , Chalmers University of Technology , Göteborg 412 96 , Sweden
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37
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Abstract
Lipid monolayers are used as experimental model systems to study the physical chemical properties of biomembranes. With this purpose, surface pressure/area per molecule isotherms provide a way to obtain information on packing and compressibility properties of the lipids. These isotherms have been interpreted considering the monolayer as a two dimensional ideal or van der Waals gas without contact with the water phase. These modelistic approaches do not fit the experimental results. Based on Thermodynamics of Irreversible Processes (TIP), the expansion/compression process is interpreted in terms of coupled phenomena between area changes and water fluxes between a bidimensional solution of hydrated head groups in the monolayer and the bulk solution. The formalism obtained can reproduce satisfactorily the surface pressure/area per lipid isotherms of monolayer in different states and also can explain the area expansion and compression produced in particles enclosed by bilayers during osmotic fluxes. This novel approach gives relevance to the lipid-water interaction in restricted media near the membrane and provides a formalism to understand the thermodynamic and kinetic response of biointerphases to biological effectors.
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Affiliation(s)
- O. A. Pinto
- Instituto de Bionanotecnología del NOA (INBIONATEC), Universidad Nacional de Santiago de Estero (UNSE- CONICET), Villa el Zanjón, Santiago del Estero, Argentina
| | - E. A. Disalvo
- Laboratorio de Biointerfases y Sistemas Biomiméticos, Centro de Investigaciones en Biofisica Aplicada y Alimentos (CIBAAL) (UNSE-CONICET), Villa el Zanjón, Santiago del Estero, Argentina
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38
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Santoro S, Vidorreta I, Coelhoso I, Lima JC, Desiderio G, Lombardo G, Drioli E, Mallada R, Crespo J, Criscuoli A, Figoli A. Experimental Evaluation of the Thermal Polarization in Direct Contact Membrane Distillation Using Electrospun Nanofiber Membranes Doped With Molecular Probes. Molecules 2019; 24:molecules24030638. [PMID: 30759729 PMCID: PMC6384993 DOI: 10.3390/molecules24030638] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 01/30/2019] [Accepted: 02/01/2019] [Indexed: 11/22/2022] Open
Abstract
Membrane distillation (MD) has recently gained considerable attention as a valid process for the production of fresh-water due to its ability to exploit low grade waste heat for operation and to ensure a nearly feed concentration-independent production of high-purity distillate. Limitations have been related to polarization phenomena negatively affecting the thermal efficiency of the process and, as a consequence, its productivity. Several theoretical models have been developed to predict the impact of the operating conditions of the process on the thermal polarization, but there is a lack of experimental validation. In this study, electrospun nanofiber membranes (ENMs) made of Poly(vinylidene fluoride) (PVDF) and doped with (1, 10-phenanthroline) ruthenium (II) Ru(phen)3 were tested at different operating conditions (i.e., temperature and velocity of the feed) in direct contact membrane distillation (DCMD). The temperature sensitive luminophore, Ru(phen)3, allowed the on-line and non-invasive mapping of the temperature at the membrane surface during the process and the experimental evaluation of the effect of the temperature and velocity of the feed on the thermal polarization.
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Affiliation(s)
- Sergio Santoro
- Institute on Membrane Technology (ITM-CNR), via P. Bucci 17/C, 87036 Rende (CS), Italy.
- Institute of Nanoscience of Aragon (INA) and Department of Chemical, Engineering and Environmental Technology, University of Zaragoza, C/Mariano Esquillor, s/n, I+D+i Building, 50018 Zaragoza, Spain.
- LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Ivan Vidorreta
- Institute of Nanoscience of Aragon (INA) and Department of Chemical, Engineering and Environmental Technology, University of Zaragoza, C/Mariano Esquillor, s/n, I+D+i Building, 50018 Zaragoza, Spain.
| | - Isabel Coelhoso
- LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Joao Carlos Lima
- LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Giovanni Desiderio
- Istituto di Nanotecnologia (CNR - NANOTEC), Via P. Bucci 31c, 87036 Rende (Cs), Italy.
| | - Giuseppe Lombardo
- Istituto per i Processi Chimico-Fisici, CNR-IPCF, Viale F. Stagno D'Alcontres 37, 98158 Messina, Italy.
| | - Enrico Drioli
- Institute on Membrane Technology (ITM-CNR), via P. Bucci 17/C, 87036 Rende (CS), Italy.
| | - Reyes Mallada
- Institute of Nanoscience of Aragon (INA) and Department of Chemical, Engineering and Environmental Technology, University of Zaragoza, C/Mariano Esquillor, s/n, I+D+i Building, 50018 Zaragoza, Spain.
| | - Joao Crespo
- LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Alessandra Criscuoli
- Institute on Membrane Technology (ITM-CNR), via P. Bucci 17/C, 87036 Rende (CS), Italy.
| | - Alberto Figoli
- Institute on Membrane Technology (ITM-CNR), via P. Bucci 17/C, 87036 Rende (CS), Italy.
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39
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Abstract
Ultraviolet resonance Raman (UVRR) spectroscopy is a vibrational technique that reveals structures and dynamics of biological macromolecules without the use of extrinsic labels. By tuning the Raman excitation wavelength to the deep UV region (e.g., 228 nm), Raman signal from tryptophan and tyrosine residues are selectively enhanced, allowing for the study of these functionally relevant amino acids in lipid and aqueous environments. In this chapter, we present methods on the UVRR data acquisition and analysis of the tryptophan vibrational modes of a model β-barrel membrane protein, OmpA, in folded and unfolded conformations.
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Affiliation(s)
- DeeAnn K Asamoto
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - Judy E Kim
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA.
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40
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Yamamoto T, Endo J, Kataoka M, Matsuhashi T, Katsumata Y, Shirakawa K, Yoshida N, Isobe S, Moriyama H, Goto S, Yamashita K, Nakanishi H, Shimanaka Y, Kono N, Shinmura K, Arai H, Fukuda K, Sano M. Decrease in membrane phospholipids unsaturation correlates with myocardial diastolic dysfunction. PLoS One 2018; 13:e0208396. [PMID: 30533011 PMCID: PMC6289418 DOI: 10.1371/journal.pone.0208396] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 11/17/2018] [Indexed: 11/19/2022] Open
Abstract
Increase in saturated fatty acid (SFA) content in membrane phospholipids dramatically affects membrane properties and cellular functioning. We sought to determine whether exogenous SFA from the diet directly affects the degree of membrane phospholipid unsaturation in adult hearts and if these changes correlate with contractile dysfunction. Although both SFA-rich high fat diets (HFDs) and monounsaturated FA (MUFA)-rich HFDs cause the same degree of activation of myocardial FA uptake, triglyceride turnover, and mitochondrial FA oxidation and accumulation of toxic lipid intermediates, the former induced more severe diastolic dysfunction than the latter, which was accompanied with a decrease in membrane phospholipid unsaturation, induction of unfolded protein response (UPR), and a decrease in the expression of Sirt1 and stearoyl-CoA desaturase-1 (SCD1), catalyzing the conversion of SFA to MUFA. When the SFA supply in the heart overwhelms the cellular capacity to use it for energy, excess exogenous SFA channels to membrane phospholipids, leading to UPR induction, and development of diastolic dysfunction.
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Affiliation(s)
- Tsunehisa Yamamoto
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Jin Endo
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Japan Science and Technology Agency, Tokyo, Japan
| | - Masaharu Kataoka
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | | | | | - Kohsuke Shirakawa
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Naohiro Yoshida
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Department of Endocrinology and Hypertension, Tokyo Women’s Medical University, Tokyo, Japan
| | - Sarasa Isobe
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Hidenori Moriyama
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Shinichi Goto
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Kaoru Yamashita
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Department of Endocrinology and Hypertension, Tokyo Women’s Medical University, Tokyo, Japan
| | | | - Yuta Shimanaka
- Graduate School of Pharmaceutical Sciences, Tokyo University, Tokyo, Japan
| | - Nozomu Kono
- Graduate School of Pharmaceutical Sciences, Tokyo University, Tokyo, Japan
| | - Ken Shinmura
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Department of General Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Hiroyuki Arai
- Graduate School of Pharmaceutical Sciences, Tokyo University, Tokyo, Japan
| | - Keiichi Fukuda
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Motoaki Sano
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Japan Science and Technology Agency, Tokyo, Japan
- * E-mail:
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41
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Zhou P, Wu S, Liu X, Hegazy M, Wu G, Huang X. Multifunctional and Programmable Modulated Interface Reactions on Proteinosomes. ACS Appl Mater Interfaces 2018; 10:38565-38573. [PMID: 30360104 DOI: 10.1021/acsami.8b11216] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A multiresponsive microcapsule has been synthesized by incorporating photoswitchable spiropyran units and the thermoresponsive monomer N-isopropylacrylamide into membrane lumens. By using functionalized light or thermoresponsive groups, this multifunctional microcapsule can modulate programmed release and interface reactions between lipase and fluorescein diacetate, alkaline phosphatase and fluorescein diphosphate, and others. Exposing this multifunctional microcapsule in a programmed controlled way allowed us to develop schematics to understand complicated interface interactions on protocells.
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Affiliation(s)
- Pei Zhou
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, The Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , China
| | - Shuang Wu
- The First Affiliated Hospital of Zhengzhou University , 40 Daxue Road , Zhengzhou 450052 , China
| | - Xiaoman Liu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, The Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , China
| | - Mohammad Hegazy
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, The Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , China
| | - Guangyu Wu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, The Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , China
| | - Xin Huang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, The Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , China
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42
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Abstract
Ionic conductance in membrane channels exhibits a power-law dependence on electrolyte concentration ( G ∼ cα). The many scaling exponents, α, reported in the literature usually require detailed interpretations concerning each particular system under study. Here, we critically evaluate the predictive power of scaling exponents by analyzing conductance measurements in four biological channels with contrasting architectures. We show that scaling behavior depends on several interconnected effects whose contributions change with concentration so that the use of oversimplified models missing critical factors could be misleading. In fact, the presence of interfacial effects could give rise to an apparent universal scaling that hides the channel distinctive features. We complement our study with 3D structure-based Poisson-Nernst-Planck (PNP) calculations, giving results in line with experiments and validating scaling arguments. Our findings not only provide a unified framework for the study of ion transport in confined geometries but also highlight that scaling arguments are powerful and simple tools with which to offer a comprehensive perspective of complex systems, especially those in which the actual structure is unknown.
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Affiliation(s)
- María Queralt-Martín
- Section on Molecular Transport, Eunice Kennedy Shriver
NICHD, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - M. Lidón López
- Laboratory of Molecular Biophysics, Department of Physics,
Universitat Jaume I, Av. Vicent Sos Baynat s/n 12071 Castellón, Spain
| | - Marcel Aguilella-Arzo
- Laboratory of Molecular Biophysics, Department of Physics,
Universitat Jaume I, Av. Vicent Sos Baynat s/n 12071 Castellón, Spain
| | - Vicente M. Aguilella
- Laboratory of Molecular Biophysics, Department of Physics,
Universitat Jaume I, Av. Vicent Sos Baynat s/n 12071 Castellón, Spain
| | - Antonio Alcaraz
- Laboratory of Molecular Biophysics, Department of Physics,
Universitat Jaume I, Av. Vicent Sos Baynat s/n 12071 Castellón, Spain
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43
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Karimi AH, Mirdamadi HR, Ziaei-Rad S. Mathematical modeling of dynamic behavior of fluid bilayer membranes under the effect of density asymmetry. J Theor Biol 2018; 454:330-344. [PMID: 29959964 DOI: 10.1016/j.jtbi.2018.06.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 05/14/2018] [Accepted: 06/26/2018] [Indexed: 11/18/2022]
Abstract
Shape transformations in biological membranes are crucial in a variety of cellular processes such as transport in the Golgi apparatus and endoplasmic reticulum, shaping the cell organelles and signaling in neuronal synapses. Dynamic analysis of lipid bilayer membranes is popular among researchers as valuable information about cell functions can be retrieved. There are several limitations in experimental tests and simulations such as computational and implementation cost while in theoretical studies, different phenomena can be modeled and the effect of each parameter can be investigated. In this paper, a continuum model including elastic energies and dissipation functions is utilized with energy approach to obtain the governing equations of an enclosed lipid bilayer membrane. The governing equations are solved numerically for vesicles initially disturbed and the relaxation dynamics is studied. The stationary shape of the vesicles for different values of reduced volume and reduced area difference is obtained to explore the phase diagram and verify the governing equations. Then, the density asymmetry in bilayers caused by the change in the density or the equilibrium density of the outer monolayer is studied. This leads to the formation of buds, tubules, and pearls. This can be observed in the recruitment of proteins to the outer monolayer or pH gradients of the environment of a vesicle. The effect of density difference and curvature on creation and growth of tubules are investigated. An interesting metastable state in the adsorption of the final bud due to the increase in the density of the outer monolayer is observed in which the shape of the vesicle is almost unchanged. A prolate vesicle relaxes toward an oblate or a stomatocyte vesicle when the equilibrium density of the outer monolayer increases.
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Affiliation(s)
- A H Karimi
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
| | - H R Mirdamadi
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
| | - S Ziaei-Rad
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
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44
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Karausta A, Bukusoglu E. Liquid Crystal-Templated Synthesis of Mesoporous Membranes with Predetermined Pore Alignment. ACS Appl Mater Interfaces 2018; 10:33484-33492. [PMID: 30198253 DOI: 10.1021/acsami.8b14121] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We demonstrate that polymeric films templated from liquid crystals (LCs) provide basic design principles for the synthesis of mesoporous films with predetermined pore alignment. Specifically, we used LC mixtures of reactive [4-(3-acryloyoxypropyloxy) benzoic acid 2-methyl-1,4-phenylene ester (RM257)] and nonreactive [4-cyano-4'-pentylbiphenyl (5CB)] mesogens confined in film geometries. The LC alignment was maintained by functionalization of the surfaces contacting the films during polymerization. Through photopolymerization followed by extraction of the unreacted mesogens, films of area in the order of 10 cm2 were obtained. We found that, when restricted to an area either through a mechanical or a configurational constraint, open and accessible pores were incorporated into the films. The average direction of the pores could be determined by the LC director during polymerization, and the average diameter of the pores can be tuned in the range of 10-40 nm by varying the reactive monomer concentration. The polymeric films synthesized here can potentially be used for the ultrafiltration purposes. We demonstrated successful separations of proteins and nanoparticles from aqueous media using the polymeric films. The films exhibited 2 orders of magnitude higher flux when the pores were aligned parallel to the permeate direction compared to the perpendicular direction. Overall, the outcomes of this study provide basic tools for the synthesis of porous polymeric films with predetermined pore directions that can potentially be suitable for separations, drug delivery, catalysts, and so forth.
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Affiliation(s)
- Aslı Karausta
- Chemical Engineering Department , Middle East Technical University , Ankara 06800 , Turkey
| | - Emre Bukusoglu
- Chemical Engineering Department , Middle East Technical University , Ankara 06800 , Turkey
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45
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Urbančič I, Brun J, Shrestha D, Waithe D, Eggeling C, Chojnacki J. Lipid Composition but Not Curvature Is the Determinant Factor for the Low Molecular Mobility Observed on the Membrane of Virus-Like Vesicles. Viruses 2018; 10:v10080415. [PMID: 30096847 PMCID: PMC6116177 DOI: 10.3390/v10080415] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 08/03/2018] [Accepted: 08/07/2018] [Indexed: 12/14/2022] Open
Abstract
Human Immunodeficiency Virus type-1 (HIV-1) acquires its lipid membrane from the plasma membrane of the infected cell from which it buds out. Previous studies have shown that the HIV-1 envelope is an environment of very low mobility, with the diffusion of incorporated proteins two orders of magnitude slower than in the plasma membrane. One of the reasons for this difference is thought to be the HIV-1 membrane composition that is characterised by a high degree of rigidity and lipid packing, which has, until now, been difficult to assess experimentally. To further refine the model of the molecular mobility on the HIV-1 surface, we herein investigated the relative importance of membrane composition and curvature in simplified model membrane systems, large unilamellar vesicles (LUVs) of different lipid compositions and sizes (0.1–1 µm), using super-resolution stimulated emission depletion (STED) microscopy-based fluorescence correlation spectroscopy (STED-FCS). Establishing an approach that is also applicable to measurements of molecule dynamics in virus-sized particles, we found, at least for the 0.1–1 µm sized vesicles, that the lipid composition and thus membrane rigidity, but not the curvature, play an important role in the decreased molecular mobility on the vesicles’ surface. This observation suggests that the composition of the envelope rather than the particle geometry contributes to the previously described low mobility of proteins on the HIV-1 surface. Our vesicle-based study thus provides further insight into the dynamic properties of the surface of individual HIV-1 particles, as well as paves the methodological way towards better characterisation of the properties and function of viral lipid envelopes in general.
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Affiliation(s)
- Iztok Urbančič
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
- "Jožef Stefan" Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia.
| | - Juliane Brun
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
| | - Dilip Shrestha
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
| | - Dominic Waithe
- Wolfson Imaging Centre Oxford, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
| | - Christian Eggeling
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
- Wolfson Imaging Centre Oxford, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
- Institute of Applied Optics, Friedrich-Schiller-University Jena, Max-Wien Platz 4, 07743 Jena, Germany.
- Leibniz Institute of Photonic Technology e.V., Albert-Einstein-Straße 9, 07745 Jena, Germany.
| | - Jakub Chojnacki
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
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Abstract
We investigate the shape of a growing interface in the presence of an impenetrable moving membrane. The two distinct geometrical arrangements of the interface and membrane, obtained by placing the membrane behind or ahead of the interface, are not symmetrically related. On the basis of numerical results and an exact calculation, we argue that these two arrangements represent two distinct universality classes for interfacial growth: while the well-established Kardar-Parisi-Zhang (KPZ) growth is obtained in the "ahead" arrangement, we find an arrested KPZ growth with a smaller roughness exponent in the "behind" arrangement. This suggests that the surface properties of growing cell membranes and expanding bacterial colonies, for example, are fundamentally distinct.
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Affiliation(s)
- J Whitehouse
- SUPA, School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom
| | - R A Blythe
- SUPA, School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom
| | - M R Evans
- SUPA, School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom
| | - D Mukamel
- Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel
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Poudyal R, Cakmak FP, Keating CD, Bevilacqua PC. Physical Principles and Extant Biology Reveal Roles for RNA-Containing Membraneless Compartments in Origins of Life Chemistry. Biochemistry 2018; 57:2509-2519. [PMID: 29560725 PMCID: PMC7276092 DOI: 10.1021/acs.biochem.8b00081] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
This Perspective focuses on RNA in biological and nonbiological compartments resulting from liquid-liquid phase separation (LLPS), with an emphasis on origins of life. In extant cells, intracellular liquid condensates, many of which are rich in RNAs and intrinsically disordered proteins, provide spatial regulation of biomolecular interactions that can result in altered gene expression. Given the diversity of biogenic and abiogenic molecules that undergo LLPS, such membraneless compartments may have also played key roles in prebiotic chemistries relevant to the origins of life. The RNA World hypothesis posits that RNA may have served as both a genetic information carrier and a catalyst during the origin of life. Because of its polyanionic backbone, RNA can undergo LLPS by complex coacervation in the presence of polycations. Phase separation could provide a mechanism for concentrating monomers for RNA synthesis and selectively partition longer RNAs with enzymatic functions, thus driving prebiotic evolution. We introduce several types of LLPS that could lead to compartmentalization and discuss potential roles in template-mediated non-enzymatic polymerization of RNA and other related biomolecules, functions of ribozymes and aptamers, and benefits or penalties imparted by liquid demixing. We conclude that tiny liquid droplets may have concentrated precious biomolecules and acted as bioreactors in the RNA World.
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Affiliation(s)
- Raghav Poudyal
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Center for RNA Molecular Biology, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Fatma Pir Cakmak
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Christine D. Keating
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Philip C. Bevilacqua
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Center for RNA Molecular Biology, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, Pennsylvania 16802, United States
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48
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Yang Y, Zhang Y, Zhang S, Chen Q, Ma K, Bao L, Tao Y, Yin W, Wang G, Liu H. Identification and Characterization of a Membrane-Bound Sesterterpene Cyclase from Streptomyces somaliensis. J Nat Prod 2018; 81:1089-1092. [PMID: 29553734 DOI: 10.1021/acs.jnatprod.7b01033] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Sesterterpenes are usually found in plants and fungi, but are rare in bacteria. Here, we present the identification of StsC from Streptomyces somaliensis, a member of the UbiA superfamily, as a membrane-bound sesterterpene cyclase in bacteria. The cyclized products for StsC, somaliensenes A (1) and B (2), were identified by expressing the corresponding gene in an engineered Escherichia coli strain. The structures of 1 and 2 were determined by analysis of the NMR and MS spectroscopic data.
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Affiliation(s)
- Yanlong Yang
- State Key Laboratory of Mycology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
| | - Yuting Zhang
- State Key Laboratory of Mycology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
- Savaid Medical School , University of Chinese Academy of Sciences , Beijing , 100049 , People's Republic of China
| | - Shasha Zhang
- Chinese Academy of Science, Key Laboratory of Microbial Physiology and Metabolic Engineering , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
| | - Qingwen Chen
- State Key Laboratory of Plant Genomics , Institute of Genetics and Developmental Biology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
| | - Ke Ma
- State Key Laboratory of Mycology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
- Savaid Medical School , University of Chinese Academy of Sciences , Beijing , 100049 , People's Republic of China
| | - Li Bao
- State Key Laboratory of Mycology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
- Savaid Medical School , University of Chinese Academy of Sciences , Beijing , 100049 , People's Republic of China
| | - Yong Tao
- Chinese Academy of Science, Key Laboratory of Microbial Physiology and Metabolic Engineering , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
| | - Wenbing Yin
- State Key Laboratory of Mycology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
- Savaid Medical School , University of Chinese Academy of Sciences , Beijing , 100049 , People's Republic of China
| | - Guodong Wang
- State Key Laboratory of Plant Genomics , Institute of Genetics and Developmental Biology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
| | - Hongwei Liu
- State Key Laboratory of Mycology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China
- Savaid Medical School , University of Chinese Academy of Sciences , Beijing , 100049 , People's Republic of China
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49
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Zeno WF, Ogunyankin MO, Longo ML. Scaling relationships for translational diffusion constants applied to membrane domain dissolution and growth. Biochim Biophys Acta Biomembr 2018; 1860:1994-2003. [PMID: 29501605 DOI: 10.1016/j.bbamem.2018.02.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 02/24/2018] [Accepted: 02/26/2018] [Indexed: 01/10/2023]
Abstract
We compare the way that relationships for diffusion constants scale with the size of diffusing membrane domains and the geometry of their environments. Then, we review our experimental work on the dynamics of dissolution/growth of membrane domains in crowding induced mixing, phase separation, and Ostwald ripening in a highly confined environment. Overall, the scaling relationships applied to diffusion constants obtained by fits to our dynamic data indicate that dissolution and growth is influenced by the diffusion of clusters or small domains of lipids, in addition to kinetic processes and geometrical constraints.
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Affiliation(s)
- Wade F Zeno
- Department of Chemical Engineering, University of California Davis, Davis, CA 95616, United States
| | - Maria O Ogunyankin
- Department of Chemical Engineering, University of California Davis, Davis, CA 95616, United States
| | - Marjorie L Longo
- Department of Chemical Engineering, University of California Davis, Davis, CA 95616, United States.
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50
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Marusak KE, Krug JR, Feng Y, Cao Y, You L, Zauscher S. Bacterially driven cadmium sulfide precipitation on porous membranes: Toward platforms for photocatalytic applications. Biointerphases 2018; 13:011006. [PMID: 29426227 PMCID: PMC5807096 DOI: 10.1116/1.5008393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 01/11/2018] [Accepted: 01/19/2018] [Indexed: 11/17/2022] Open
Abstract
The emerging field of biofabrication capitalizes on nature's ability to create materials with a wide range of well-defined physical and electronic properties. Particularly, there is a current push to utilize programmed, self-organization of living cells for material fabrication. However, much research is still necessary at the interface of synthetic biology and materials engineering to make biofabrication a viable technique to develop functional devices. Here, the authors exploit the ability of Escherichia coli to contribute to material fabrication by designing and optimizing growth platforms to direct inorganic nanoparticle (NP) synthesis, specifically cadmium sulfide (CdS) NPs, onto porous polycarbonate membranes. Additionally, current, nonbiological, chemical synthesis methods for CdS NPs are typically energy intensive and use high concentrations of hazardous cadmium precursors. Using biosynthesis methods through microorganisms could potentially alleviate these issues by precipitating NPs with less energy and lower concentrations of toxic precursors. The authors adopted extracellular precipitation strategies to form CdS NPs on the membranes as bacterial/membrane composites and characterized them by spectroscopic and imaging methods, including energy dispersive spectroscopy, and scanning and transmission electron microscopy. This method allowed us to control the localization of NP precipitation throughout the layered bacterial/membrane composite, by varying the timing of the cadmium precursor addition. Additionally, the authors demonstrated the photodegradation of methyl orange using the CdS functionalized porous membranes, thus confirming the photocatalytic properties of these composites for eventual translation to device development. If combined with the genetically programmed self-organization of cells, this approach promises to directly pattern CdS nanostructures on solid supports.
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Affiliation(s)
- Katherine E Marusak
- Department of Mechanical Engineering and Materials Science, Duke University, 144 Hudson Hall Box 90300, Durham, North Carolina 27708
| | - Julia R Krug
- Department of Mechanical Engineering and Materials Science, Duke University, 144 Hudson Hall Box 90300, Durham, North Carolina 27708
| | - Yaying Feng
- Department of Mechanical Engineering and Materials Science, Duke University, 144 Hudson Hall Box 90300, Durham, North Carolina 27708
| | - Yangxiaolu Cao
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, North Carolina 27708
| | - Lingchong You
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, North Carolina 27708; Center for Genomic and Computational Biology, Duke University, 101 Science Drive, Durham, North Carolina 27708; and Department of Molecular Genetics and Microbiology, Duke University School of Medicine, DUMC 3710, Durham, North Carolina 27710
| | - Stefan Zauscher
- Department of Mechanical Engineering and Materials Science, Duke University, 144 Hudson Hall Box 90300, Durham, North Carolina 27708 and Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, North Carolina 27708
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