1
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Caritá AC, Cavalcanti RRM, Oliveira MSS, Riske KA. Solubilization of biomimetic lipid mixtures by some commonly used non-ionic detergents. Chem Phys Lipids 2023; 255:105327. [PMID: 37442532 DOI: 10.1016/j.chemphyslip.2023.105327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/03/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023]
Abstract
Detergents are amphiphilic molecules often used to solubilize biological membranes and separate their components. Here we investigate the solubilization of lipid vesicles by the commonly used non-ionic detergents polyoxyethylene (20) oleyl ether (Brij 98), n-octyl-β-D-glucoside (OG), and n-dodecyl β-D maltoside (DDM) and compare the results with the standard detergent Triton X-100 (TX-100). The vesicles were composed of palmitoyl oleoyl phosphatidylcholine (POPC) or of a biomimetic ternary mixture of POPC, egg sphingomyelin (SM) and cholesterol (2:1:2 molar ratio). To follow the solubilization profile of large unilamellar vesicles (LUVs), 90° light scattering measurements were done along the titration of LUVs with the detergents. Then, giant unilamellar vesicles (GUVs) were observed with optical microscopy during exposure to the detergents, to allow direct visualization of the solubilization process. Isothermal titration calorimetry (ITC) was used to assess the binding constant of the detergents in POPC bilayers. The results show that the incorporation of TX-100, Brij 98 and, to a lesser extent, OG in the pure POPC liposomes leads to an increase in the vesicle area, which indicates their ability to redistribute between the two leaflets of the membrane in a short scale of time. On the other hand, DDM incorporates mainly in the external leaflet causing an increase in vesicle curvature/tension leading ultimately to vesicle burst. Only TX-100 and OG were able to completely solubilize the POPC vesicles, whereas the biomimetic ternary mixture was partially insoluble in all detergents tested. TX-100 and OG were able to incorporate in the bilayer of the ternary mixture and induce macroscopic phase separation of liquid-ordered (Lo) and liquid-disordered (Ld) domains, with selective solubilization of the latter. Combination of ITC data with turbidity results showed that TX-100 and OG can be incorporated up to almost 0.3 detergent/lipid, significantly more than Brij 98 and DDM. This fact seems to be directly related to their higher capacity to solubilize POPC membranes and their ability to induce macroscopic phase separation in the biomimetic lipid mixture.
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Affiliation(s)
- Amanda C Caritá
- Universidade Federal de São Paulo, Department of Biophysics, São Paulo, Brazil
| | | | | | - Karin A Riske
- Universidade Federal de São Paulo, Department of Biophysics, São Paulo, Brazil.
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2
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Beratto-Ramos A, Dagnino-Leone J, Martínez-Oyanedel J, Fernández M, Aranda M, Bórquez R. Optimization of detergents in solubilization and reconstitution of Aquaporin Z: A structural approach. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2023; 1865:184101. [PMID: 36535340 DOI: 10.1016/j.bbamem.2022.184101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 12/03/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND The exceptional capacities of aquaporins in terms of water permeation and selectivity have made them an interesting system for membrane applications. Despite the multiple attempts for immobilizing the aquaporins over a porous substrate, there is a lack of studies related to the purification and reconstitution steps, principally associated with the use of detergents in solubilization and destabilization steps. This study analyzed the effect of detergents in Aquaporin Z solubilization, considering the purity and structural homogeneity of the protein. METHODS The extraction process was optimized by the addition of detergent at the sonication step, which enabled the omission of the ultracentrifugation and resuspension steps. Two detergents, Triton X-100, and octyl-glucoside were also evaluated. Destabilization mediated by detergents was used as reconstitution method. Saturation and solubilization points were defined by detergent concentration and both, liposomes and proteoliposomes, were analyzed by size distribution and permeability assays. Detergent removal with Bio-beads was also analyzed. RESULTS Octyl glucoside ensures structural stability and homogeneity of Aquaporin Z. However, high concentrations of detergents induce the presence of defects in proteoliposomes. While saturated liposomes create homogeneous and functional structures, solubilized liposomes get affected by a reassembly process, creating vesicle defects with anomalous permeability profiles. CONCLUSIONS Detergent concentration affects the structural conformation of proteoliposomes in the reconstitution process. GENERAL SIGNIFICANCE Since the destabilization process is dependent on vesicle, detergent, and buffer composition, optimization of this process should be mandatory for further studies. All these considerations will allow achieving the potential of Aquaporins and any other integral membrane protein in their applications for industrial purposes.
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Affiliation(s)
| | | | - José Martínez-Oyanedel
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Biológicas, Universidad de Concepción, Chile
| | - Marcos Fernández
- Departamento de Farmacia, Facultad de Farmacia, Universidad de Concepción, Chile
| | - Mario Aranda
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Chile
| | - Rodrigo Bórquez
- Department of Chemical Engineering, Universidad de Concepción, Chile.
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3
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Pamu R, Khomami B, Mukherjee D. Observation of anomalous carotenoid and blind chlorophyll activations in photosystem I under synthetic membrane confinements. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183930. [PMID: 35398026 DOI: 10.1016/j.bbamem.2022.183930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 03/27/2022] [Accepted: 04/01/2022] [Indexed: 06/14/2023]
Abstract
The role of natural thylakoid membrane confinements in architecting the robust structural and electrochemical properties of PSI is not fully understood. Most PSI studies till date extract the proteins from their natural confinements that can lead to non-native conformations. Recently our group had successfully reconstituted PSI in synthetic lipid membranes using detergent-mediated liposome solubilizations. In this study, we investigate the alterations in chlorophylls and carotenoids interactions and reorganization in PSI based on spectral property changes induced by its confinement in anionic DPhPG and zwitterionic DPhPC phospholipid membranes. To this end, we employ a combination of absorption, fluorescence, and circular dichroism (CD) spectroscopic measurements. Our results indicate unique activation and alteration of photoresponses from the PSI carotenoid (Car) bands in PSI-DPhPG proteoliposomes that can tune the Excitation Energy Transfer (EET), otherwise absent in PSI at non-native environments. Specifically, we observe broadband light harvesting via enhanced absorption in the otherwise non-absorptive green region (500-580 nm) of the Chlorophylls (Chl) along with ~64% increase in the full-width half maximum of the Qy band (650-720 nm). The CD results indicate enhanced Chl-Chl and Chl-Car interactions along with conformational changes in protein secondary structures. Such distinct changes in the Car and Chl bands are not observed in PSI confined in DPhPC. The fundamental insights into membrane microenvironments tailoring PSI subunits reorganization and interactions provide novel strategies for tuning photoexcitation processes and rational designing of biotic-abiotic interfaces in PSI-based photoelectrochemical energy conversion systems.
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Affiliation(s)
- Ravi Pamu
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3), University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA
| | - Bamin Khomami
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA; Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA.
| | - Dibyendu Mukherjee
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3), University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA.
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4
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Dresser L, Graham SP, Miller LM, Schaefer C, Conteduca D, Johnson S, Leake MC, Quinn SD. Tween-20 Induces the Structural Remodeling of Single Lipid Vesicles. J Phys Chem Lett 2022; 13:5341-5350. [PMID: 35678387 PMCID: PMC9208007 DOI: 10.1021/acs.jpclett.2c00704] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 05/31/2022] [Indexed: 05/04/2023]
Abstract
The solubilization of lipid membranes by Tween-20 is crucial for a number of biotechnological applications, but the mechanistic details remain elusive. Evidence from ensemble assays supports a solubilization model that encompasses surfactant association with the membrane and the release of mixed micelles to solution, but whether this process also involves intermediate transitions between regimes is unanswered. In search of mechanistic origins, increasing focus is placed on identifying Tween-20 interactions with controllable membrane mimetics. Here, we employed ultrasensitive biosensing approaches, including single-vesicle spectroscopy based on fluorescence and energy transfer from membrane-encapsulated molecules, to interrogate interactions between Tween-20 and submicrometer-sized vesicles below the optical diffraction limit. We discovered that Tween-20, even at concentrations below the critical micellar concentration, triggers stepwise and phase-dependent structural remodeling events, including permeabilization and swelling, in both freely diffusing and surface-tethered vesicles, highlighting the substantial impact the surfactant has on vesicle conformation and stability prior to lysis.
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Affiliation(s)
- Lara Dresser
- Department
of Physics, University of York, York YO10 5DD, U.K.
| | - Sarah P. Graham
- Department
of Physics, University of York, York YO10 5DD, U.K.
| | - Lisa M. Miller
- Department
of Electronic Engineering, University of
York, York YO10 5DD, U.K.
| | | | | | - Steven Johnson
- Department
of Electronic Engineering, University of
York, York YO10 5DD, U.K.
- York
Biomedical Research Institute, University
of York, York YO10 5DD, U.K.
| | - Mark C. Leake
- Department
of Physics, University of York, York YO10 5DD, U.K.
- Department
of Biology, University of York, York YO10 5DD, U.K.
- York
Biomedical Research Institute, University
of York, York YO10 5DD, U.K.
| | - Steven D. Quinn
- Department
of Physics, University of York, York YO10 5DD, U.K.
- York
Biomedical Research Institute, University
of York, York YO10 5DD, U.K.
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5
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Gutiérrez-Méndez N, Chavez-Garay DR, Leal-Ramos MY. Lecithins: A comprehensive review of their properties and their use in formulating microemulsions. J Food Biochem 2022; 46:e14157. [PMID: 35355280 DOI: 10.1111/jfbc.14157] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 03/08/2022] [Accepted: 03/15/2022] [Indexed: 11/28/2022]
Abstract
Lecithins are a phospholipid-rich mixture recovered from the degumming process of crude vegetable oils. Since the nineteenth century, this by-product of oil processing has been used as a food and pharmaceutical ingredient. Lecithins' popularity as an ingredient in the pharmaceutical and food industries arises from their particular properties, such as their hydrophilic-lipophilic balance, critical micellar concentration, and assembly properties. However, there is limited knowledge of the use of lecithins to formulate pharmaceutical- and food-grade microemulsions. Unlike conventional emulsions, microemulsions are thermodynamically stable systems that offer long-term stability. Besides, microemulsions show nano-sized droplets, transparency, ease of preparation and scale-up, and do not require expensive equipment. This review aims to provide a comprehensive overview of lecithins, their properties, and their use in formulating microemulsions, a promising method to incorporate, protect, and deliver bioactive compounds in pharmaceutical and food products. PRACTICAL APPLICATIONS: Lecithins are a phospholipid-rich mixture recovered from the degumming process of crude vegetable oils. Since the nineteenth century, this by-product of oil processing has been used as a food ingredient. Lecithin phospholipids are commonly used as emulsifier agents in the food and pharmaceutical industries because of their particular properties. However, there is limited knowledge of the use of lecithins to formulate pharmaceutical- or food-grade microemulsions. Unlike conventional emulsions, microemulsions are stable systems that offer long-term stability, nano-sized droplets, transparency, ease of preparation and scale-up, and do not require expensive equipment. This review aims to provide a comprehensive overview of lecithins, their properties, and their use in formulating microemulsions, a promising method to incorporate, protect, and deliver bioactive compounds such as vitamins, flavors, antioxidants, nutrients, colors, antimicrobials, and polyphenols.
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6
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Lombardo D, Kiselev MA. Methods of Liposomes Preparation: Formation and Control Factors of Versatile Nanocarriers for Biomedical and Nanomedicine Application. Pharmaceutics 2022; 14:pharmaceutics14030543. [PMID: 35335920 PMCID: PMC8955843 DOI: 10.3390/pharmaceutics14030543] [Citation(s) in RCA: 129] [Impact Index Per Article: 64.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 02/21/2022] [Accepted: 02/24/2022] [Indexed: 12/13/2022] Open
Abstract
Liposomes are nano-sized spherical vesicles composed of an aqueous core surrounded by one (or more) phospholipid bilayer shells. Owing to their high biocompatibility, chemical composition variability, and ease of preparation, as well as their large variety of structural properties, liposomes have been employed in a large variety of nanomedicine and biomedical applications, including nanocarriers for drug delivery, in nutraceutical fields, for immunoassays, clinical diagnostics, tissue engineering, and theranostics formulations. Particularly important is the role of liposomes in drug-delivery applications, as they improve the performance of the encapsulated drugs, reducing side effects and toxicity by enhancing its in vitro- and in vivo-controlled delivery and activity. These applications stimulated a great effort for the scale-up of the formation processes in view of suitable industrial development. Despite the improvements of conventional approaches and the development of novel routes of liposome preparation, their intrinsic sensitivity to mechanical and chemical actions is responsible for some critical issues connected with a limited colloidal stability and reduced entrapment efficiency of cargo molecules. This article analyzes the main features of the formation and fabrication techniques of liposome nanocarriers, with a special focus on the structure, parameters, and the critical factors that influence the development of a suitable and stable formulation. Recent developments and new methods for liposome preparation are also discussed, with the objective of updating the reader and providing future directions for research and development.
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Affiliation(s)
- Domenico Lombardo
- Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico-Fisici, 98158 Messina, Italy
- Correspondence: ; Tel.: +39-090-39762222
| | - Mikhail A. Kiselev
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia;
- Department of Nuclear Physics, Dubna State University, 141980 Dubna, Moscow Region, Russia
- Physics Department, Lomonosov Moscow State University, 119991 Moscow, Moscow Region, Russia
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7
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Zeng L, Wang H, Shi W, Chen L, Chen T, Chen G, Wang W, Lan J, Huang Z, Zhang J, Chen J. Aloe derived nanovesicle as a functional carrier for indocyanine green encapsulation and phototherapy. J Nanobiotechnology 2021; 19:439. [PMID: 34930289 PMCID: PMC8686546 DOI: 10.1186/s12951-021-01195-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 12/08/2021] [Indexed: 12/27/2022] Open
Abstract
Background Cancer is one of the devastating diseases in the world. The development of nanocarrier provides a promising perspective for improving cancer therapeutic efficacy. However, the issues with potential toxicity, quantity production, and excessive costs limit their further applications in clinical practice. Results Herein, we proposed a nanocarrier obtained from aloe with stability and leak-proofness. We isolated nanovesicles from the gel and rind of aloe (gADNVs and rADNVs) with higher quality and yield by controlling the final centrifugation time within 20 min, and modulating the viscosity at 2.98 mPa S and 1.57 mPa S respectively. The gADNVs showed great structure and storage stability, antioxidant and antidetergent capacity. They could be efficiently taken up by melanoma cells, and with no toxicity in vitro or in vivo. Indocyanine green (ICG) loaded in gADNVs (ICG/gADNVs) showed great stability in both heating system and in serum, and its retention rate exceeded 90% after 30 days stored in gADNVs. ICG/gADNVs stored 30 days could still effectively damage melanoma cells and inhibit melanoma growth, outperforming free ICG and ICG liposomes. Interestingly, gADNVs showed prominent penetrability to mice skin which might be beneficial to noninvasive transdermal administration. Conclusions Our research was designed to simplify the preparation of drug carrier, and reduce production cost, which provided an alternative for the development of economic and safe drug delivery system. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s12951-021-01195-7.
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Affiliation(s)
- Lupeng Zeng
- The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China.,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Huaying Wang
- The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China.,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Wanhua Shi
- The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China.,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Lingfan Chen
- Fujian Province New Drug Safety Evaluation Centre, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Tingting Chen
- The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China.,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Guanyu Chen
- The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China.,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Wenshen Wang
- Department of Chemical Biology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, People's Republic of China
| | - Jianming Lan
- The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China.,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Zhihong Huang
- Public Technology Service Center, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China
| | - Jing Zhang
- Department of Chemical Biology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, People's Republic of China.
| | - Jinghua Chen
- The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China. .,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, The School of Pharmacy, Fujian Medical University, Fuzhou, 350122, Fujian, People's Republic of China.
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8
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Wang Z, Mim C. Optimizing purification of the peripheral membrane protein FAM92A1 fused to a modified spidroin tag. Protein Expr Purif 2021; 189:105992. [PMID: 34648955 DOI: 10.1016/j.pep.2021.105992] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 10/05/2021] [Accepted: 10/06/2021] [Indexed: 11/30/2022]
Abstract
Cryo-electron microscopy has revolutionized structural biology. In particular structures of proteins at the membrane interface have been a major contribution of cryoEM. Yet, visualization and characterization of peripheral membrane proteins remains challenging; mostly because there is no unified purification strategy for these proteins. FAM92A1 is a novel peripheral membrane protein that binds to the mitochondrial inner membrane. There, FAM92A1 dimers bind to the membrane and play an essential role in regulating the mitochondrial ultrastructure. Curiously, FAM92A1 has also an important function in ciliogenesis. FAM92A1 is part of the membrane bending Bin1/Amphiphsyin/RVS (BAR) domain protein family. Currently, there is no structure of FAM92A1, mostly because FAM92A1 is unstable and insoluble at high concentrations, like many BAR domain proteins. Yet, pure and concentrated protein is a necessity for screening to generate samples suitable for structure determination. Here, we present an optimized purification and expression strategy for dimeric FAM92A1. To our knowledge, we are the first to use the spidroin tag NT* to successfully purify a peripheral membrane protein. Our results show that NT* not only increases solubility but stabilizes FAM92A1 as a dimer. FAM92A1 fused to NT* is active because it is able to efficiently bend membranes. Taken together, our strategy indicates that this is a possible avenue to express and purify other challenging BAR domain proteins.
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Affiliation(s)
- Zuoneng Wang
- Department of Biomedical Engineering and Health Systems, Royal Technical Institute (KTH), Hälsovägen 11C, 141 2 Huddinge, Sweden
| | - Carsten Mim
- Department of Biomedical Engineering and Health Systems, Royal Technical Institute (KTH), Hälsovägen 11C, 141 2 Huddinge, Sweden.
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9
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Solis-Gonzalez OA, Avendaño-Gómez JR, Rojas-Aguilar A. A thermodynamic study of F108 and F127 block copolymer interactions with liposomes at physiological temperature. J Liposome Res 2021; 32:32-44. [PMID: 33322974 DOI: 10.1080/08982104.2020.1865401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The interactions of egg yolk phosphatidylcholine liposomes with F108 and F127 triblock copolymers, in the monomer state, were analyzed by isothermal titration calorimetry (ITC) at 37 °C. According to the results, the critical micelle concentration was determined to be 0.4 and 0.04 wt.% for F108 and F127, respectively, by surface tension at 37 °C. According to the results, liposomes/poloxamers were not favoured energetically, since endothermic interactions were observed. However, positive changes in entropy promoted a spontaneous process. F127 had a greater partition coefficient (51.97 ± 1.77 × 104), stronger affinity, than F108 (8.19 ± 0.37 × 104) towards the vesicle lipid bilayer due to its larger hydrophobic block. After the ITC experiments, an increased vesicle size (within about 1-3 nm average) by dynamic light scattering and the formation of bilayer discs by electron microscopy (EM) was observed at low copolymer concentrations (0.57 mol% of F108 and 1.01 mol% of F127). The EM and ITC results confirmed the intimate association of the copolymers with the membrane instead of being simply absorbed onto the bilayer surface. Our results indicate that the temperature of the system (37 °C), the copolymer concentration and hydrophobic chain length are important factors for the interaction of poloxamers with lipid bilayers and the stability of liposomes.
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Affiliation(s)
- Obed Andres Solis-Gonzalez
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, Ciudad de México, México
| | - Juan Ramon Avendaño-Gómez
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, Ciudad de México, México
| | - Aarón Rojas-Aguilar
- Departamento de Química, Centro de Investigación y Estudios Avanzados del IPN, Ciudad de México, México
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10
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Juan-Colás J, Dresser L, Morris K, Lagadou H, Ward RH, Burns A, Tear S, Johnson S, Leake MC, Quinn SD. The Mechanism of Vesicle Solubilization by the Detergent Sodium Dodecyl Sulfate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11499-11507. [PMID: 32870686 DOI: 10.1021/acs.langmuir.0c01810] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Membrane solubilization by sodium dodecyl sulfate (SDS) is indispensable for many established biotechnological applications, including viral inactivation and protein extraction. Although the ensemble thermodynamics have been thoroughly explored, the underlying molecular dynamics have remained inaccessible, owing to major limitations of traditional measurement tools. Here, we integrate multiple advanced biophysical approaches to gain multiangle insight into the time-dependence and fundamental kinetic steps associated with the solubilization of single submicron sized vesicles in response to SDS. We find that the accumulation of SDS molecules on intact vesicles triggers biphasic solubilization kinetics comprising an initial vesicle expansion event followed by rapid lipid loss and micellization. Our findings support a general mechanism of detergent-induced membrane solubilization, and we expect that the framework of correlative biophysical technologies presented here will form a general platform for elucidating the complex kinetics of membrane perturbation induced by a wide variety of surfactants and disrupting agents.
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Affiliation(s)
- José Juan-Colás
- Department of Electronic Engineering, University of York, Heslington, York YO10 5DD, U.K
| | - Lara Dresser
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
| | - Katie Morris
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
| | - Hugo Lagadou
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
| | - Rebecca H Ward
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
| | - Amy Burns
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
| | - Steve Tear
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
| | - Steven Johnson
- Department of Electronic Engineering, University of York, Heslington, York YO10 5DD, U.K
- York Biomedical Research Institute, University of York, Heslington, York YO10 5DD, U.K
| | - Mark C Leake
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
- Department of Biology, University of York, Heslington, York YO10 5DD, U.K
- York Biomedical Research Institute, University of York, Heslington, York YO10 5DD, U.K
| | - Steven D Quinn
- Department of Physics, University of York, Heslington, York YO10 5DD, U.K
- York Biomedical Research Institute, University of York, Heslington, York YO10 5DD, U.K
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11
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Rottet S, Iqbal S, Beales PA, Lin A, Lee J, Rug M, Scott C, Callaghan R. Characterisation of Hybrid Polymersome Vesicles Containing the Efflux Pumps NaAtm1 or P-Glycoprotein. Polymers (Basel) 2020; 12:E1049. [PMID: 32375237 PMCID: PMC7284524 DOI: 10.3390/polym12051049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 04/24/2020] [Accepted: 04/25/2020] [Indexed: 11/18/2022] Open
Abstract
Investigative systems for purified membrane transporters are almost exclusively reliant on the use of phospholipid vesicles or liposomes. Liposomes provide an environment to support protein function; however, they also have numerous drawbacks and should not be considered as a "one-size fits all" system. The use of artificial vesicles comprising block co-polymers (polymersomes) offers considerable advantages in terms of structural stability; provision of sufficient lateral pressure; and low passive permeability, which is a particular issue for transport assays using hydrophobic compounds. The present investigation demonstrates strategies to reconstitute ATP binding cassette (ABC) transporters into hybrid vesicles combining phospholipids and the block co-polymer poly (butadiene)-poly (ethylene oxide). Two efflux pumps were chosen; namely the Novosphingobium aromaticivorans Atm1 protein and human P-glycoprotein (Pgp). Polymersomes were generated with one of two lipid partners, either purified palmitoyl-oleoyl-phosphatidylcholine, or a mixture of crude E. coli lipid extract and cholesterol. Hybrid polymersomes were characterised for size, structural homogeneity, stability to detergents, and permeability. Two transporters, NaAtm1 and P-gp, were successfully reconstituted into pre-formed and surfactant-destabilised hybrid polymersomes using a detergent adsorption strategy. Reconstitution of both proteins was confirmed by density gradient centrifugation and the hybrid polymersomes supported substrate dependent ATPase activity of both transporters. The hybrid polymersomes also displayed low passive permeability to a fluorescent probe (calcein acetomethoxyl-ester (C-AM)) and offer the potential for quantitative measurements of transport activity for hydrophobic compounds.
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Affiliation(s)
- Sarah Rottet
- CSIRO Synthetic Biology Future Science Platform, GPO Box 1700, Acton, Canberra 2601, Australia; (S.R.); (C.S.)
| | - Shagufta Iqbal
- Research School of Biology, and the Medical School, Australian National University, Canberra 2601, Australia; (S.I.); (A.L.)
| | - Paul A. Beales
- School of Chemistry Bragg Centre for Materials Research and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK;
| | - Anran Lin
- Research School of Biology, and the Medical School, Australian National University, Canberra 2601, Australia; (S.I.); (A.L.)
| | - Jiwon Lee
- Centre for Advanced Microscopy, Australian National University, Canberra 2601, Australia; (J.L.); (M.R.)
| | - Melanie Rug
- Centre for Advanced Microscopy, Australian National University, Canberra 2601, Australia; (J.L.); (M.R.)
| | - Colin Scott
- CSIRO Synthetic Biology Future Science Platform, GPO Box 1700, Acton, Canberra 2601, Australia; (S.R.); (C.S.)
| | - Richard Callaghan
- Research School of Biology, and the Medical School, Australian National University, Canberra 2601, Australia; (S.I.); (A.L.)
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12
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Borràs J, Mesa V, Suades J, Barnadas-Rodríguez R. Direct Synthesis of Rhenium and Technetium-99m Metallosurfactants by a Transmetallation Reaction of Lipophilic Groups: Potential Applications in the Radiolabeling of Liposomes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1993-2002. [PMID: 31995988 DOI: 10.1021/acs.langmuir.9b03231] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A new zinc dithiocarbamate functionalized with palmitoyl groups is described as a useful tool for the preparation of metallosurfactants through a transmetallation reaction with the transition metals rhenium and technetium. An amphiphilic rhenium complex is synthesized by a transmetallation reaction with the zinc complex in presence of the polar phosphine sodium triphenylphosphine trisulfonate, which leads to a rhenium complex with a lipophilic dithiocarbamate and a polar phosphine ligand. The study of this rhenium complex has shown that it self-aggregates, leading to the formation of aggregates that have been analyzed by dynamic light scattering and cryotransmission electron microscopy (cryo-TEM). In addition, this amphiphilic rhenium complex is incorporated into soy phosphatidylcholine liposomes, whether liposomes are prepared by mixing phospholipid and the rhenium complex or by the incorporation of the rhenium complex into preformed liposomes. The one-pot reaction of the radiocompound [99mTc(H2O)3(CO)3]+ with the above-mentioned zinc dithiocarbamate, the phosphine sodium triphenylphosphine trisulfonate and the phospholipid soy phosphatidylcholine, leads to liposomes labeled with a Tc-99m homologous complex of the rhenium complex, in accordance with the high-performance liquid chromatography (HPLC) data.
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Affiliation(s)
- Jordi Borràs
- Departament de Quı́mica, Edifici C, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Catalonia, Spain
| | - Verónica Mesa
- Departament de Quı́mica, Edifici C, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Catalonia, Spain
| | - Joan Suades
- Departament de Quı́mica, Edifici C, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Catalonia, Spain
| | - Ramon Barnadas-Rodríguez
- Unitat de Biofı́sica/Centre d'Estudis en Biofı́sica, Departament de Bioquı́mica i Biologia Molecular, Facultat de Medicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Catalonia, Spain
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13
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Pamu R, Sandireddy VP, Kalyanaraman R, Khomami B, Mukherjee D. Plasmon-Enhanced Photocurrent from Photosystem I Assembled on Ag Nanopyramids. J Phys Chem Lett 2018; 9:970-977. [PMID: 29405719 DOI: 10.1021/acs.jpclett.7b03255] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Plasmonic metal nanostructures have been known to tune optoelectronic properties of fluorophores. Here, we report the first-ever experimental observation of plasmon-induced photocurrent enhancements from Photosystem I (PSI) immobilized on Fischer patterns of silver nanopyramids (Ag-NP). To this end, the plasmonic peaks of Ag-NP were tuned to match the PSI absorption peaks at ∼450 and ∼680 nm wavelengths. Specifically, the plasmon-enhanced photocurrents indicate enhancement factors of ∼6.5 and ∼5.8 as compared to PSI assembly on planar Ag substrates for nominal excitation wavelengths of 660 and 470 nm, respectively. The comparable enhancement factors from both 470 and 660 nm excitations, in spite of a significantly weaker plasmon absorption peak at ∼450 nm for the Ag-NP structures, can be rationalized by previously reported excessive plasmon-induced fluorescence emission losses from PSI in the red region as compared to the blue region of the excitation wavelengths.
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Affiliation(s)
- Ravi Pamu
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - V Prasad Sandireddy
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Ramki Kalyanaraman
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Bamin Khomami
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Dibyendu Mukherjee
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
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14
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Tang J, Ma D, Pecic S, Huang C, Zheng J, Li J, Yang R. Noninvasive and Highly Selective Monitoring of Intracellular Glucose via a Two-Step Recognition-Based Nanokit. Anal Chem 2017; 89:8319-8327. [PMID: 28707883 DOI: 10.1021/acs.analchem.7b01532] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Accurate determination of intracellular glucose is very important for exploring its chemical and biological functions in metabolism events of living cells. In this paper, we developed a new noninvasive and highly selective nanokit for intracellular glucose monitoring via two-step recognition. The liposome-based nanokit coencapsulated the aptamer-functionalized gold nanoparticles (AuNPs) and the Shinkai's receptor together. When the proposed nanokit was transfected into living cells, the Shinkai's receptor could recognize glucose first and then changed its conformation to endow aptamers with binding and sensing properties which were not readily accessible otherwise. Then, the binary complexes formed by the intracellular glucose and the Shinkai's receptor can in situ displace the complementary oligonucleotide of the aptamer on the surface of AuNPs. The fluorophore-labeled aptamer was away from the AuNPs, and the fluorescent state switched from "off" to "on". Through the secondary identification of aptamer, the selectivity of the Shinkai's receptor could be greatly improved while the intracellular glucose level was assessed by fluorescence signal recovery of aptamer. In the follow-up application, the approach exhibits excellent selectivity and is noninvasive for intracellular glucose monitoring under normoxia and hypoxia. To the best of our knowledge, this is the first time that the advantages of organic receptors and nucleic acids have been combined and highly selective monitoring of intracellular glucose has been realized via two-step recognition. We expect it to open up new possibilities to integrate devices for diagnosis of various metabolic diseases and insulin delivery.
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Affiliation(s)
- Jianru Tang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha, Hunan 410082, China
| | - Dandan Ma
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha, Hunan 410082, China
| | - Stevan Pecic
- University Medical Center, Columbia University , New York, New York 10032, United States
| | - Caixia Huang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha, Hunan 410082, China
| | - Jing Zheng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha, Hunan 410082, China
| | - Jishan Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha, Hunan 410082, China
| | - Ronghua Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha, Hunan 410082, China.,School of Chemistry and Biological Engineering, Changsha University of Science and Technology , Changsha, Hunan 410082, China
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15
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Niroomand H, Mukherjee D, Khomami B. Tuning the photoexcitation response of cyanobacterial Photosystem I via reconstitution into Proteoliposomes. Sci Rep 2017; 7:2492. [PMID: 28559589 PMCID: PMC5449388 DOI: 10.1038/s41598-017-02746-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/19/2017] [Indexed: 12/25/2022] Open
Abstract
The role of natural thylakoid membrane housing of Photosystem I (PSI), the transmembrane photosynthetic protein, in its robust photoactivated charge separation with near unity quantum efficiency is not fundamentally understood. To this end, incorporation of suitable protein scaffolds for PSI incorporation is of great scientific and device manufacturing interest. Areas of interest include solid state bioelectronics, and photoelectrochemical devices that require bio-abio interfaces that do not compromise the photoactivity and photostability of PSI. Therefore, the surfactant-induced membrane solubilization of a negatively charged phospholipid (DPhPG) with the motivation of creating biomimetic reconstructs of PSI reconstitution in DPhPG liposomes is studied. Specifically, a simple yet elegant method for incorporation of PSI trimeric complexes into DPhPG bilayer membranes that mimic the natural thylakoid membrane housing of PSI is introduced. The efficacy of this method is demonstrated via absorption and fluorescence spectroscopy measurements as well as direct visualization using atomic force microscopy. This study provides direct evidence that PSI confinements in synthetic lipid scaffolds can be used for tuning the photoexcitation characteristics of PSI. Hence, it paves the way for development of fundamental understanding of microenvironment alterations on photochemical response of light activated membrane proteins.
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Affiliation(s)
- Hanieh Niroomand
- Sustainable Energy Education and Research Center (SEERC), Knoxville, USA.,Department of Chemical and Biomolecular Engineering, Knoxville, USA
| | - Dibyendu Mukherjee
- Sustainable Energy Education and Research Center (SEERC), Knoxville, USA. .,Department of Chemical and Biomolecular Engineering, Knoxville, USA. .,Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, USA.
| | - Bamin Khomami
- Sustainable Energy Education and Research Center (SEERC), Knoxville, USA. .,Department of Chemical and Biomolecular Engineering, Knoxville, USA. .,Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, USA.
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