1
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Varandas PAMM, Belinha R, Cobb AJA, Prates Ramalho JP, Segundo MA, Loura LMS, Silva EMP. Flow-based bioconjugation of coumarin phosphatidylethanolamine probes: Optimised synthesis and membrane molecular dynamics studies. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2024; 1866:184335. [PMID: 38763271 DOI: 10.1016/j.bbamem.2024.184335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 04/01/2024] [Accepted: 05/11/2024] [Indexed: 05/21/2024]
Abstract
A series of phosphatidylethanolamine fluorescent probes head-labelled with 3-carboxycoumarin was prepared by an improved bioconjugation approach through continuous flow synthesis. The established procedure, supported by a design of experiment (DoE) set-up, resulted in a significant reduction in the reaction time compared to the conventional batch method, in addition to a minor yield increase. The characterization of these probes was enhanced by an in-depth molecular dynamics (MD) study of the behaviour of a representative probe of this family, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine labelled with 3-carboxycoumarin (POPE-COUM), in bilayers of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC)/1-stearoyl-2-linoleoyl-sn-glycero-3-phosphocholine (SLPC) 2:1, mimicking the composition of the egg yolk lecithin membranes recently used experimentally by our group to study POPE-COUM as a biomarker of the oxidation state and integrity of large unilamellar vesicles (LUVs). The MD simulations revealed that the coumarin group is oriented towards the bilayer interior, leading to a relatively internal location, in agreement with what is observed in the nitrobenzoxadiazole fluorophore of commercial head-labelled NBD-PE probes. This behaviour is consistent with the previously stated hypothesis that POPE-COUM is entirely located within the LUVs structure. Hence, the delay on the oxidation of the probe in the oxygen radical absorbance capacity (ORAC) assays performed is related with the inaccessibility of the probe until alteration of the LUV structure occurs. Furthermore, our simulations show that POPE-COUM exerts very little global and local perturbation on the host bilayer, as evaluated by key properties of the unlabelled lipids. Together, our findings establish PE-COUM as suitable fluorescent lipid analogue probes.
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Affiliation(s)
- Pedro A M M Varandas
- LAQV, REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal
| | - Ricardo Belinha
- LAQV, REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal
| | - Alexander J A Cobb
- Department of Chemistry, King's College London, 7 Trinity Street, London SE1 1DB, United Kingdom
| | - João P Prates Ramalho
- Department of Chemistry, School of Science and Technology, University of Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal; LAQV, REQUIMTE, University of Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal; Hercules Laboratory, University of Évora, Palácio do Vimioso, Largo Marquês de Marialva 8, 7000-809 Évora, Portugal
| | - Marcela A Segundo
- LAQV, REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal.
| | - Luís M S Loura
- Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal; Coimbra Chemistry Center - Institute of Molecular Sciences (CQC-IMS), Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Eduarda M P Silva
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, University Institute of Health Sciences - CESPU, 4585-116 Gandra, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Translational Toxicology Research Laboratory, University Institute of Health Sciences (1H-TOXRUN, IUCS-CESPU), 4585-116 Gandra, Portugal
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2
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Rajput D, Mahalingavelar P, Soppina V, Kanvah S. Improved lipophilic probe for visualizing lipid droplets in erastin-induced ferroptosis. Org Biomol Chem 2023; 21:8554-8562. [PMID: 37853800 DOI: 10.1039/d3ob01545a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
Studying the viscosity of lipid droplets (LDs) provides insights into various diseases associated with LD viscosity. Ferroptosis is one such process in which LD viscosity increases due to the abnormal accumulation of lipid ROS (reactive oxygen species) caused by peroxidation. For investigating the LD imaging and ferroptosis, we developed two molecules (NNS and DNS) that show significant Stokes shifts (182-232 nm) and utilized them for sub-cellular imaging. Excellent localization is noted with the lipid droplets. Subsequently, DNS was used to monitor the variations in the LD viscosity during erastin-induced ferroptosis followed by ferroptosis inhibition. Additionally, we explored variations in the LD quantity, size, and accumulation when subjected to oleic acid stimulation. Extensive DFT and TDDFT investigations have been employed to understand the effect of NO2 substitution on the linear and branched molecular derivatives. Our results with the improved lipophilic fluorophore, exhibiting excellent colocalization with LDs, offer valuable insights into sensing erastin-induced ferroptosis and have the potential for real-time diagnostic applications.
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Affiliation(s)
- Deeksha Rajput
- Department of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat - 382055, India.
| | | | - Virupakshi Soppina
- Department of Biological Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat-382055, India.
| | - Sriram Kanvah
- Department of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat - 382055, India.
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3
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Lee D, Song S, Cho G, Dalle Ore LC, Malmstadt N, Fuwad A, Kim SM, Jeon TJ. Elucidating the Molecular Interactions between Lipids and Lysozyme: Evaporation Resistance and Bacterial Barriers for Dry Eye Disease. NANO LETTERS 2023; 23:9451-9460. [PMID: 37842945 DOI: 10.1021/acs.nanolett.3c02936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Dry eye disease (DED) is a chronic condition characterized by ocular dryness and inflammation. The tear film lipid layer (TFLL) is the outermost layer composed of lipids and proteins that protect the ocular surface. However, environmental contaminants can disrupt its structure, potentially leading to DED. Although the importance of tear proteins in the TFLL functionality has been clinically recognized, the molecular mechanisms underlying TFLL-protein interactions remain unclear. In this study, we investigated tear protein-lipid interactions and analyzed their role in the TFLL functionality. The results show that lysozyme (LYZ) increases the stability of the TFLL by reducing its surface tension and increasing its surface pressure, resulting in increased TFLL evaporation and bacterial invasion resistance, with improved wettability and lubrication performance. These findings highlight the critical role of LYZ in maintaining ocular health and provide potential avenues for investigating novel approaches to DED treatment and patient well-being.
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Affiliation(s)
- Deborah Lee
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States
| | - Seoyoon Song
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States
| | - Geonho Cho
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Lucia C Dalle Ore
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States
| | - Noah Malmstadt
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States
| | - Ahmed Fuwad
- Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Sun Min Kim
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Tae-Joon Jeon
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Department of Biological Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
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4
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Lee D, Song S, Kim S, Lee M, Kim E, Yoon S, Kim HU, Son S, Jung HS, Huh YS, Kim SM, Jeon TJ. Multicomponent-Loaded Vesosomal Drug Carrier for Controlled and Sustained Compound Release. Biomacromolecules 2023; 24:3898-3907. [PMID: 37435976 DOI: 10.1021/acs.biomac.3c00528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
Liposomes have been extensively adopted in drug delivery systems with clinically approved formulations. However, hurdles remain in terms of loading multiple components and precisely controlling their release. Herein, we report a vesosomal carrier composed of liposomes encapsulated inside the core of another liposome for the controlled and sustained release of multiple contents. The inner liposomes are made of lipids with different compositions and are co-encapsulated with a photosensitizer. Upon induction of reactive oxygen species (ROS), the contents of the liposomes are released, with each type of liposome displaying distinct kinetics due to the variance in lipid peroxidation for differential structural deformation. In vitro experiments demonstrated immediate content release from ROS-vulnerable liposomes, followed by sustained release from ROS-nonvulnerable liposomes. Moreover, the release trigger was validated at the organismal level using Caenorhabditis elegans. This study demonstrates a promising platform for more precisely controlling the release of multiple components.
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Affiliation(s)
- Deborah Lee
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Seoyoon Song
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Suheon Kim
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Mina Lee
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Eunsu Kim
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Sunhee Yoon
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Han-Ul Kim
- Department of Biochemistry, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Sejin Son
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Department of Biological Sciences, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Hyun Suk Jung
- Department of Biochemistry, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Yun Suk Huh
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Department of Biological Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Sun Min Kim
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Tae-Joon Jeon
- Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
- Department of Biological Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
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5
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Clayton AHA. Spectral Relaxation Imaging Microscopy II: Complex Dynamics. Int J Mol Sci 2023; 24:12271. [PMID: 37569641 PMCID: PMC10419246 DOI: 10.3390/ijms241512271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 07/18/2023] [Accepted: 07/25/2023] [Indexed: 08/13/2023] Open
Abstract
The dynamics of condensed matter can be measured by the time-dependent Stokes shift of a suitable fluorescent probe. The time-dependent spectral correlation function is typically described by one or more spectral relaxation correlation times, which, in liquid solvents, characterize the timescales of the dipolar relaxation processes around the excited-state probe. The phasor plot provides a powerful approach to represent and analyze time and frequency-domain data acquired as images, thus providing a spatial map of spectral dynamics in a complex structure such as a living cell. Measurements of the phase and modulation at two emission wavelength channels were shown to be sufficient to extract a single excited-state lifetime and a single spectral relaxation correlation time, supplying estimates of the mean rate of excited-state depopulation and the mean rate of spectral shift. In the present contribution, two more issues were addressed. First, the provision of analytic formulae allowing extraction of the initial generalized polarization and the relaxed generalized polarization, which characterize the fluorescence spectrum of the unrelaxed state and the fully relaxed state. Second, improved methods of model discrimination and model parameter extraction for more complex spectral relaxation phenomena. The analysis workflow was illustrated with examples from the literature.
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Affiliation(s)
- Andrew H A Clayton
- Cell Biophysics Laboratory, Department of Physics and Astronomy, Optical Sciences Centre, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne 3122, Australia
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6
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Nordholt N, O'Hara K, Resch-Genger U, Blaskovich MAT, Rühle B, Schreiber F. A fluorescently labelled quaternary ammonium compound (NBD-DDA) to study resistance mechanisms in bacteria. Front Microbiol 2022; 13:1023326. [PMID: 36504769 PMCID: PMC9731378 DOI: 10.3389/fmicb.2022.1023326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 10/21/2022] [Indexed: 11/26/2022] Open
Abstract
Quaternary ammonium compounds (QACs) are widely used as active agents in disinfectants, antiseptics, and preservatives. Despite being in use since the 1940s, there remain multiple open questions regarding their detailed mode-of-action and the mechanisms, including phenotypic heterogeneity, that can make bacteria less susceptible to QACs. To facilitate studies on resistance mechanisms towards QACs, we synthesized a fluorescent quaternary ammonium compound, namely N-dodecyl-N,N-dimethyl-[2-[(4-nitro-2,1,3-benzoxadiazol-7-yl)amino]ethyl]azanium-iodide (NBD-DDA). NBD-DDA is readily detected by flow cytometry and fluorescence microscopy with standard GFP/FITC-settings, making it suitable for molecular and single-cell studies. As a proof-of-concept, NBD-DDA was then used to investigate resistance mechanisms which can be heterogeneous among individual bacterial cells. Our results reveal that the antimicrobial activity of NBD-DDA against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa is comparable to that of benzalkonium chloride (BAC), a widely used QAC, and benzyl-dimethyl-dodecylammonium chloride (BAC12), a mono-constituent BAC with alkyl-chain length of 12 and high structural similarity to NBD-DDA. Characteristic time-kill kinetics and increased tolerance of a BAC tolerant E. coli strain against NBD-DDA suggest that the mode of action of NBD-DDA is similar to that of BAC. As revealed by confocal laser scanning microscopy (CLSM), NBD-DDA is preferentially localized to the cell envelope of E. coli, which is a primary target of BAC and other QACs. Leveraging these findings and NBD-DDA's fluorescent properties, we show that reduced cellular accumulation is responsible for the evolved BAC tolerance in the BAC tolerant E. coli strain and that NBD-DDA is subject to efflux mediated by TolC. Overall, NBD-DDA's antimicrobial activity, its fluorescent properties, and its ease of detection render it a powerful tool to study resistance mechanisms of QACs in bacteria and highlight its potential to gain detailed insights into its mode-of-action.
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Affiliation(s)
- Niclas Nordholt
- Division of Biodeterioration and Reference Organisms (4.1), Department of Materials and the Environment, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
| | - Kate O'Hara
- Division of Biodeterioration and Reference Organisms (4.1), Department of Materials and the Environment, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany,Division of Biophotonics (1.2), Department of Analytical Chemistry, Reference Materials, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
| | - Ute Resch-Genger
- Division of Biophotonics (1.2), Department of Analytical Chemistry, Reference Materials, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
| | - Mark A. T. Blaskovich
- Centre for Superbug Solutions, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Bastian Rühle
- Division of Biophotonics (1.2), Department of Analytical Chemistry, Reference Materials, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
| | - Frank Schreiber
- Division of Biodeterioration and Reference Organisms (4.1), Department of Materials and the Environment, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany,*Correspondence: Frank Schreiber,
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7
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Sivaiah A, Ramanujam B, Ramesh Babu K. Fluorescent benzofurazan derivatized triazole linked mono and di-glucopyranosyl conjugates: Selective sensing of fluoride ion and coordination features by DFT computation. Carbohydr Res 2022; 521:108653. [DOI: 10.1016/j.carres.2022.108653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 08/20/2022] [Accepted: 08/22/2022] [Indexed: 11/02/2022]
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Yazdani H, Shahbazi MA, Varma RS. 2D and 3D Covalent Organic Frameworks: Cutting-Edge Applications in Biomedical Sciences. ACS APPLIED BIO MATERIALS 2022; 5:40-58. [PMID: 35014828 DOI: 10.1021/acsabm.1c01015] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Covalent organic frameworks (COFs) are crystalline porous organic structures with two- or three-dimensional (2D or 3D) features and composed of building blocks being connected via covalent bonds. The manifold applications of COFs in optoelectronic devices, energy conversion and storage, adsorption, separation, sensing, organocatalysis, photocatalysis, electrocatalytic reactions, and biomedicine are increasing because of their notable intrinsic features such as large surface area, porosity, designable structure, low density, crystallinity, biocompatibility, and high chemical stability. These properties have rendered 2D and 3D COF-based materials as desirable entities for drug delivery, gene delivery, photothermal therapy, photodynamic therapy, combination therapy, biosensing, bioimaging, and anticancer activities. Herein, different reactions and methods for the synthesis of 2D and 3D COFs are reviewed with special emphasis on the construction and state-of-the-art progress pertaining to the biomedical applications of 2D and 3D COFs of varying shapes, sizes, and structures. Specifically, stimuli-responsive COFs-based systems and targeted drug delivery approaches are summarized.
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Affiliation(s)
- Hossein Yazdani
- Department of Organic Chemistry, Shahid Beheshti University G.C., Tehran 1983963113, Iran
| | - Mohammad-Ali Shahbazi
- Department of Biomedical Engineering, University of Groningen, University Medical Center Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands.,Zanjan Pharmaceutical Nanotechnology Research Center (ZPNRC), Zanjan University of Medical Sciences, 45139-46184 Zanjan, Iran
| | - Rajender S Varma
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute Palacký University in Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
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Barrantes FJ. Fluorescence sensors for imaging membrane lipid domains and cholesterol. CURRENT TOPICS IN MEMBRANES 2021; 88:257-314. [PMID: 34862029 DOI: 10.1016/bs.ctm.2021.09.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Lipid membrane domains are supramolecular lateral heterogeneities of biological membranes. Of nanoscopic dimensions, they constitute specialized hubs used by the cell as transient signaling platforms for a great variety of biologically important mechanisms. Their property to form and dissolve in the bulk lipid bilayer endow them with the ability to engage in highly dynamic processes, and temporarily recruit subpopulations of membrane proteins in reduced nanometric compartments that can coalesce to form larger mesoscale assemblies. Cholesterol is an essential component of these lipid domains; its unique molecular structure is suitable for interacting intricately with crevices and cavities of transmembrane protein surfaces through its rough β face while "talking" to fatty acid acyl chains of glycerophospholipids and sphingolipids via its smooth α face. Progress in the field of membrane domains has been closely associated with innovative improvements in fluorescence microscopy and new fluorescence sensors. These advances enabled the exploration of the biophysical properties of lipids and their supramolecular platforms. Here I review the rationale behind the use of biosensors over the last few decades and their contributions towards elucidation of the in-plane and transbilayer topography of cholesterol-enriched lipid domains and their molecular constituents. The challenges introduced by super-resolution optical microscopy are discussed, as well as possible scenarios for future developments in the field, including virtual ("no staining") staining.
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Affiliation(s)
- Francisco J Barrantes
- Biomedical Research Institute (BIOMED), Catholic University of Argentina (UCA)-National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina.
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10
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Scollo F, Evci H, Amaro M, Jurkiewicz P, Sykora J, Hof M. What Does Time-Dependent Fluorescence Shift (TDFS) in Biomembranes (and Proteins) Report on? Front Chem 2021; 9:738350. [PMID: 34778202 PMCID: PMC8586494 DOI: 10.3389/fchem.2021.738350] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 09/21/2021] [Indexed: 11/17/2022] Open
Abstract
The organization of biomolecules and bioassemblies is highly governed by the nature and extent of their interactions with water. These interactions are of high intricacy and a broad range of methods based on various principles have been introduced to characterize them. As these methods view the hydration phenomena differently (e.g., in terms of time and length scales), a detailed insight in each particular technique is to promote the overall understanding of the stunning “hydration world.” In this prospective mini-review we therefore critically examine time-dependent fluorescence shift (TDFS)—an experimental method with a high potential for studying the hydration in the biological systems. We demonstrate that TDFS is very useful especially for phospholipid bilayers for mapping the interfacial region formed by the hydrated lipid headgroups. TDFS, when properly applied, reports on the degree of hydration and mobility of the hydrated phospholipid segments in the close vicinity of the fluorophore embedded in the bilayer. Here, the interpretation of the recorded TDFS parameters are thoroughly discussed, also in the context of the findings obtained by other experimental techniques addressing the hydration phenomena (e.g., molecular dynamics simulations, NMR spectroscopy, scattering techniques, etc.). The differences in the interpretations of TDFS outputs between phospholipid biomembranes and proteins are also addressed. Additionally, prerequisites for the successful TDFS application are presented (i.e., the proper choice of fluorescence dye for TDFS studies, and TDFS instrumentation). Finally, the effects of ions and oxidized phospholipids on the bilayer organization and headgroup packing viewed from TDFS perspective are presented as application examples.
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Affiliation(s)
- Federica Scollo
- J. Heyrovský Institute of Physical Chemistry of the CAS, Prague, Czechia
| | - Hüseyin Evci
- J. Heyrovský Institute of Physical Chemistry of the CAS, Prague, Czechia
| | - Mariana Amaro
- J. Heyrovský Institute of Physical Chemistry of the CAS, Prague, Czechia
| | - Piotr Jurkiewicz
- J. Heyrovský Institute of Physical Chemistry of the CAS, Prague, Czechia
| | - Jan Sykora
- J. Heyrovský Institute of Physical Chemistry of the CAS, Prague, Czechia
| | - Martin Hof
- J. Heyrovský Institute of Physical Chemistry of the CAS, Prague, Czechia
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11
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Gracheva IA, Tretiakova DS, Zamyshlyaeva OG, Kudriashova ES, Vodovozova EL, Fedorov AY, Boldyrev IA. Cy5-Labeled Phosphatidylcholine. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1068162021050265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Rajan S, de Guzman HC, Palaia T, Goldberg IJ, Hussain MM. A simple, rapid, and sensitive fluorescence-based method to assess triacylglycerol hydrolase activity. J Lipid Res 2021; 62:100115. [PMID: 34508728 PMCID: PMC8488599 DOI: 10.1016/j.jlr.2021.100115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 08/26/2021] [Accepted: 08/30/2021] [Indexed: 01/22/2023] Open
Abstract
Lipases constitute an important class of water-soluble enzymes that catalyze the hydrolysis of hydrophobic triacylglycerol (TAG). Their enzymatic activity is typically measured using multistep procedures involving isolation and quantification of the hydrolyzed products. We report here a new fluorescence method to measure lipase activity in real time that does not require the separation of substrates from products. We developed this method using adipose triglyceride lipase (ATGL) and lipoprotein lipase (LpL) as model lipases. We first incubated a source of ATGL or LpL with substrate vesicles containing nitrobenzoxadiazole (NBD)-labeled TAG, then measured increases in NBD fluorescence, and calculated enzyme activities. Incorporation of NBD-TAG into phosphatidylcholine (PC) vesicles resulted in some hydrolysis; however, incorporation of phosphatidylinositol into these NBD-TAG/PC vesicles and increasing the ratio of NBD-TAG to PC greatly enhanced substrate hydrolysis. This assay was also useful in measuring the activity of pancreatic lipase and hormone-sensitive lipase. Next, we tested several small-molecule lipase inhibitors and found that orlistat inhibits all lipases, indicating that it is a pan-lipase inhibitor. In short, we describe a simple, rapid, fluorescence-based triacylglycerol hydrolysis assay to assess four major TAG hydrolases: intracellular ATGL and hormone-sensitive lipase, LpL localized at the extracellular endothelium, and pancreatic lipase present in the intestinal lumen. The major advantages of this method are its speed, simplicity, and elimination of product isolation. This assay is potentially applicable to a wide range of lipases, is amenable to high-throughput screening to discover novel modulators of triacylglycerol hydrolases, and can be used for diagnostic purposes.
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Affiliation(s)
- Sujith Rajan
- Department of Foundations of Medicine, NYU Long Island School of Medicine, and Diabetes and Obesity Research Center, NYU Langone Hospitals - Long Island, Mineola, NY, USA
| | - Hazel C de Guzman
- Department of Foundations of Medicine, NYU Long Island School of Medicine, and Diabetes and Obesity Research Center, NYU Langone Hospitals - Long Island, Mineola, NY, USA; Department of Environmental Medicine, NYU Grossman School of Medicine, New York, NY, USA
| | - Thomas Palaia
- Department of Foundations of Medicine, NYU Long Island School of Medicine, and Diabetes and Obesity Research Center, NYU Langone Hospitals - Long Island, Mineola, NY, USA
| | - Ira J Goldberg
- Division of Endocrinology, Department of Medicine, NYU Grossman School of Medicine, New York, NY, USA
| | - M Mahmood Hussain
- Department of Foundations of Medicine, NYU Long Island School of Medicine, and Diabetes and Obesity Research Center, NYU Langone Hospitals - Long Island, Mineola, NY, USA; VA New York Harbor Healthcare System, Brooklyn, NY, USA.
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13
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de Abreu RC, Ramos CV, Becher C, Lino M, Jesus C, da Costa Martins PA, Martins PAT, Moreno MJ, Fernandes H, Ferreira L. Exogenous loading of miRNAs into small extracellular vesicles. J Extracell Vesicles 2021; 10:e12111. [PMID: 34377372 PMCID: PMC8329988 DOI: 10.1002/jev2.12111] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 04/13/2021] [Accepted: 05/12/2021] [Indexed: 01/01/2023] Open
Abstract
Small extracellular vesicles (sEVs), through their natural ability to interact with biological membranes and exploit endogenous processing pathways to convey biological information, are quintessential for the delivery of therapeutically relevant compounds, such as microRNAs (miRNAs) and proteins. Here, we used a fluorescently-labelled miRNA to quantify the efficiency of different methods to modulate the cargo of sEVs. Our results showed that, compared with electroporation, heat shock, permeation by a detergent-based compound (saponin) or cholesterol-modification of the miRNA, Exo-Fect was the most efficient method with > 50% transfection efficiency. Furthermore, qRT-PCR data showed that, compared with native sEVs, Exo-Fect modulation led to a > 1000-fold upregulation of the miRNA of interest. Importantly, this upregulation was observed for sEVs isolated from multiple sources. The modulated sEVs were able to delivery miR-155-5p into a reporter cell line, confirming the successful delivery of the miRNA to the target cell and, more importantly, its functionality. Finally, we showed that the membrane of Exo-Fect-loaded sEVs was altered compared with native sEVs and that enhanced the internalization of Exo-Fect-loaded sEVs within the target cells and decreased the interaction of those modulated sEVs with lysosomes.
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Affiliation(s)
- Ricardo C. de Abreu
- CNC ‐ Centro de Neurociências e Biologia CelularCIBB ‐ Centro de Inovação em Biomedicina e BiotecnologiaUniversity of CoimbraCoimbraPortugal
- Faculty of Health, Medicine and Life SciencesCARIM School for Cardiovascular DiseasesMaastricht UniversityMaastrichtThe Netherlands
- Department of Molecular GeneticsFaculty of Sciences and EngineeringMaastricht UniversityMaastrichtThe Netherlands
| | - Cristiana V. Ramos
- Chemistry DepartmentFaculty of Science and TechnologyCoimbra Chemistry CentreUniversity of CoimbraCoimbraPortugal
| | - Clarissa Becher
- CNC ‐ Centro de Neurociências e Biologia CelularCIBB ‐ Centro de Inovação em Biomedicina e BiotecnologiaUniversity of CoimbraCoimbraPortugal
| | - Miguel Lino
- CNC ‐ Centro de Neurociências e Biologia CelularCIBB ‐ Centro de Inovação em Biomedicina e BiotecnologiaUniversity of CoimbraCoimbraPortugal
| | - Carlos Jesus
- CNC ‐ Centro de Neurociências e Biologia CelularCIBB ‐ Centro de Inovação em Biomedicina e BiotecnologiaUniversity of CoimbraCoimbraPortugal
| | - Paula A. da Costa Martins
- Faculty of Health, Medicine and Life SciencesCARIM School for Cardiovascular DiseasesMaastricht UniversityMaastrichtThe Netherlands
- Department of Molecular GeneticsFaculty of Sciences and EngineeringMaastricht UniversityMaastrichtThe Netherlands
| | - Patrícia A. T. Martins
- CNC ‐ Centro de Neurociências e Biologia CelularCIBB ‐ Centro de Inovação em Biomedicina e BiotecnologiaUniversity of CoimbraCoimbraPortugal
- Chemistry DepartmentFaculty of Science and TechnologyCoimbra Chemistry CentreUniversity of CoimbraCoimbraPortugal
| | - Maria João Moreno
- Chemistry DepartmentFaculty of Science and TechnologyCoimbra Chemistry CentreUniversity of CoimbraCoimbraPortugal
| | - Hugo Fernandes
- CNC ‐ Centro de Neurociências e Biologia CelularCIBB ‐ Centro de Inovação em Biomedicina e BiotecnologiaUniversity of CoimbraCoimbraPortugal
- Faculty of MedicineUniversity of CoimbraCoimbraPortugal
| | - Lino Ferreira
- CNC ‐ Centro de Neurociências e Biologia CelularCIBB ‐ Centro de Inovação em Biomedicina e BiotecnologiaUniversity of CoimbraCoimbraPortugal
- Faculty of MedicineUniversity of CoimbraCoimbraPortugal
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14
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Wongso H, Yamasaki T, Kumata K, Ono M, Higuchi M, Zhang MR, Fulham MJ, Katsifis A, Keller PA. Design, Synthesis, and Biological Evaluation of Novel Fluorescent Probes Targeting the 18-kDa Translocator Protein. ChemMedChem 2021; 16:1902-1916. [PMID: 33631047 DOI: 10.1002/cmdc.202000984] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/22/2021] [Indexed: 12/20/2022]
Abstract
A series of fluorescent probes from the 6-chloro-2-phenylimidazo[1,2-a]pyridine-3-yl acetamides ligands featuring the 7-nitro-2-oxa-1,3-diazol-4-yl (NBD) moiety has been synthesized and biologically evaluated for their fluorescence properties and for their binding affinity to the 18-kDa translocator protein (TSPO). Spectroscopic studies including UV/Vis absorption and fluorescence measurements showed that the synthesized fluorescent probes exhibit favorable spectroscopic properties, especially in nonpolar environments. In vitro fluorescence staining in brain sections from lipopolysaccharide (LPS)-injected mice revealed partial colocalization of the probes with the TSPO. The TSPO binding affinity of the probes was measured on crude mitochondrial fractions separated from rat brain homogenates in a [11 C]PK11195 radioligand binding assay. All the new fluorescent probes demonstrated moderate to high binding affinity to the TSPO, with affinity (Ki ) values ranging from 0.58 nM to 3.28 μM. Taking these data together, we propose that the new fluorescent probes could be used to visualize the TSPO.
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Affiliation(s)
- Hendris Wongso
- School of Chemistry and Molecular Bioscience, and Molecular Horizons, University of Wollongong, Wollongong, NSW, 2522, Australia.,Center for Applied Nuclear Science and Technology, National Nuclear Energy Agency, Bandung, 40132, Indonesia
| | - Tomoteru Yamasaki
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, Chiba, 263-8555, Japan
| | - Katsushi Kumata
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, Chiba, 263-8555, Japan
| | - Maiko Ono
- Department of Functional Brain Imaging Research, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Makoto Higuchi
- Department of Functional Brain Imaging Research, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Ming-Rong Zhang
- Department of Advanced Nuclear Medicine Sciences, National Institute of Radiological Sciences, Chiba, 263-8555, Japan
| | - Michael J Fulham
- Department of PET and Nuclear Medicine, Royal Prince Alfred Hospital, Camperdown, NSW, 2050, Australia
| | - Andrew Katsifis
- Department of PET and Nuclear Medicine, Royal Prince Alfred Hospital, Camperdown, NSW, 2050, Australia
| | - Paul A Keller
- School of Chemistry and Molecular Bioscience, and Molecular Horizons, University of Wollongong, Wollongong, NSW, 2522, Australia
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15
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Tang J, You G, Ruan L, Lu Y, Wen B, Wu S. Antioxidant Behavior Affected by Polarity in the Olive Oil: Experimental and Molecular Simulation Investigations. ACS OMEGA 2021; 6:7119-7126. [PMID: 33748625 PMCID: PMC7970541 DOI: 10.1021/acsomega.1c00120] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
Natural antioxidants are essential potential sources for protecting the oxidation of food oils. However, until now, the mechanisms are still not very clear, especially from the quantitatively theoretical level to analyze the antioxidant behavior. In this work, the micromechanisms of the antioxidant behavior affected by polarity in the olive oil were systematically investigated by experimental and computational methods. The results showed that the polarity of antioxidants decreased with the growth of the alkyl chains, which had multiple impacts on the effectiveness of antioxidants. The excessive polarity gap between the antioxidant and oil molecules would cause the antioxidant to be dispersed at the oil-air interface, which could enhance their antioxidant ability. Meanwhile, the antioxidants with longer alkyl chains had lower polarity and better dispersibility but decreased mobility. Hence, compared with other antioxidants, medium polarity antioxidants presented both good dispersion and relatively suitable migration, indicating that they would have an optimal antioxidant effect.
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Affiliation(s)
- Jie Tang
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Guohua You
- College
of Information Science & Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Lu Ruan
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Yi Lu
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Bianying Wen
- Beijing
Key Laboratory of Quality Evaluation Technology for Hygiene and Safety
of Plastics, Beijing Technology and Business
University, Beijing 100048, PR China
| | - Sizhu Wu
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China
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16
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Moreno MJ, Teles Martins PA, Bernardino EF, Abel B, Ambudkar SV. Characterization of the Lipidome and Biophysical Properties of Membranes from High Five Insect Cells Expressing Mouse P-Glycoprotein. Biomolecules 2021; 11:biom11030426. [PMID: 33799403 PMCID: PMC8001469 DOI: 10.3390/biom11030426] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 12/31/2022] Open
Abstract
The lipid composition of biomembranes influences the properties of the lipid bilayer and that of the proteins. In this study, the lipidome and the lipid/protein ratio of membranes from High Five™ insect cells overexpressing mouse P-glycoprotein was characterized. This provides a better understanding of the lipid environment in which P-glycoprotein is embedded, and thus of its functional and structural properties. The relative abundance of the distinct phospholipid classes and their acyl chain composition was characterized. A mass ratio of 0.57 ± 0.11 phospholipids to protein was obtained. Phosphatidylethanolamines are the most abundant phospholipids, followed by phosphatidylcholines. Membranes are also enriched in negatively charged lipids (phosphatidylserines, phosphatidylinositols and phosphatidylglycerols), and contain small amounts of sphingomyelins, ceramides and monoglycosilatedceramides. The most abundant acyl chains are monounsaturated, with significant amounts of saturated chains. The characterization of the phospholipids by HPLC-MS allowed identification of the combination of acyl chains, with palmitoyl-oleoyl being the most representative for all major phospholipid classes except for phosphatidylserines, which are mostly saturated. A mixture of POPE:POPC:POPS in the ratio 45:35:20 is proposed for the preparation of simple representative model membranes. The adequacy of the model membranes was further evaluated by characterizing their surface potential and fluidity.
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Affiliation(s)
- Maria João Moreno
- Coimbra Chemistry Center, Chemistry Department, FCTUC, University of Coimbra, 3004-535 Coimbra, Portugal; (P.A.T.M.); (E.F.B.)
- CNC—Center for Neuroscience and Cell Biology, University of Coimbra, 3004-535 Coimbra, Portugal
- Correspondence:
| | | | - Eva F. Bernardino
- Coimbra Chemistry Center, Chemistry Department, FCTUC, University of Coimbra, 3004-535 Coimbra, Portugal; (P.A.T.M.); (E.F.B.)
| | - Biebele Abel
- Laboratory of Cell Biology, CCR, National Cancer Institute, NIH, Bethesda, MD 20892, USA; (B.A.); (S.V.A.)
| | - Suresh V. Ambudkar
- Laboratory of Cell Biology, CCR, National Cancer Institute, NIH, Bethesda, MD 20892, USA; (B.A.); (S.V.A.)
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17
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Chen W, Li S, Lang JC, Chang Y, Pan Z, Kroll P, Sun X, Tang L, Dong H. Combined Tumor Environment Triggered Self-Assembling Peptide Nanofibers and Inducible Multivalent Ligand Display for Cancer Cell Targeting with Enhanced Sensitivity and Specificity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2002780. [PMID: 32812362 PMCID: PMC8283777 DOI: 10.1002/smll.202002780] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/14/2020] [Indexed: 05/03/2023]
Abstract
Many new technologies, such as cancer microenvironment-induced nanoparticle targeting and multivalent ligand approach for cell surface receptors, are developed for active targeting in cancer therapy. While the principle of each technology is well illustrated, most systems suffer from low targeting specificity and sensitivity. To fill the gap, this work demonstrates a successful attempt to combine both technologies to simultaneously improve cancer cell targeting sensitivity and specificity. Specifically, the main component is a targeting ligand conjugated self-assembling monomer precursor (SAM-P), which, at the tumor site, undergoes tumor-triggered cleavage to release the active form of self-assembling monomer capable of forming supramolecular nanostructures. Biophysical characterization confirms the chemical and physical transformation of SAM-P from unimers or oligomers with low ligand valency to supramolecular assemblies with high ligand valency under a tumor-mimicking reductive microenvironment. The in vitro fluorescence assay shows the importance of supramolecular morphology in mediating ligand-receptor interactions and targeting sensitivity. Enhanced targeting specificity and sensitivity can be achieved via tumor-triggered supramolecular assembly and induces multivalent ligand presentation toward cell surface receptors, respectively. The results support this combined tumor microenvironment-induced cell targeting and multivalent ligand display approach, and have great potential for use as cell-specific molecular imaging and therapeutic agents with high sensitivity and specificity.
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Affiliation(s)
- Weike Chen
- Department of Chemistry & Biochemistry, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Shuxin Li
- Department of Bioengineering, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - John C Lang
- Department of Chemistry & Biochemistry, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Yan Chang
- College of Nursing and Health Innovation, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Zui Pan
- College of Nursing and Health Innovation, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Peter Kroll
- Department of Chemistry & Biochemistry, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Xiankai Sun
- Department of Radiology, The University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Liping Tang
- Department of Bioengineering, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - He Dong
- Department of Chemistry & Biochemistry, The University of Texas at Arlington, Arlington, TX, 76019, USA
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18
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Filipe HAL, Moreno MJ, Loura LMS. The Secret Lives of Fluorescent Membrane Probes as Revealed by Molecular Dynamics Simulations. Molecules 2020; 25:E3424. [PMID: 32731549 PMCID: PMC7435664 DOI: 10.3390/molecules25153424] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/23/2020] [Accepted: 07/25/2020] [Indexed: 12/15/2022] Open
Abstract
Fluorescent probes have been employed for more than half a century to study the structure and dynamics of model and biological membranes, using spectroscopic and/or microscopic experimental approaches. While their utilization has led to tremendous progress in our knowledge of membrane biophysics and physiology, in some respects the behavior of bilayer-inserted membrane probes has long remained inscrutable. The location, orientation and interaction of fluorophores with lipid and/or water molecules are often not well known, and they are crucial for understanding what the probe is actually reporting. Moreover, because the probe is an extraneous inclusion, it may perturb the properties of the host membrane system, altering the very properties it is supposed to measure. For these reasons, the need for independent methodologies to assess the behavior of bilayer-inserted fluorescence probes has been recognized for a long time. Because of recent improvements in computational tools, molecular dynamics (MD) simulations have become a popular means of obtaining this important information. The present review addresses MD studies of all major classes of fluorescent membrane probes, focusing in the period between 2011 and 2020, during which such work has undergone a dramatic surge in both the number of studies and the variety of probes and properties accessed.
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Affiliation(s)
- Hugo A. L. Filipe
- Chemistry Department, Coimbra Chemistry Center, Faculty of Sciences and Technology, University of Coimbra, 3004-535 Coimbra, Portugal;
| | - Maria João Moreno
- Coimbra Chemistry Center and CNC—Center for Neuroscience and Cell Biology, Chemistry Department, Faculty of Sciences and Technology, University of Coimbra, 3004-535 Coimbra, Portugal;
| | - Luís M. S. Loura
- Coimbra Chemistry Center and CNC—Center for Neuroscience and Cell Biology, Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal
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19
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Dutta T, Pal K, Koner AL. Cellular metabolic activity marker via selective turn-ON detection of transporter protein using nitrobenzoxadiazole-based fluorescent reporter. Sci Rep 2020; 10:4166. [PMID: 32139799 PMCID: PMC7058046 DOI: 10.1038/s41598-020-60954-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 02/05/2020] [Indexed: 01/21/2023] Open
Abstract
A nitrobenzoxadiazole-based fluoroprobe (NBD-Bu) is designed to probe cellular metabolic activity in cancer and normal cells. NBD-Bu shows a significant fluorescence enhancement upon selective binding to the transport protein serum albumin in PBS buffer at ambient conditions. Encouraged by this finding, the site- specificity of NBD-Bu has been explored through a competitive displacement assay in the presence of site-specific markers such as warfarin and ibuprofen. Notably, even at micromolar concentrations, the probe possesses the ability to displace the site marker drug ibuprofen, efficiently. Subsequently, high-resolution fluorescence imaging results consolidated the potential of NBD-Bu for detection of abnormal cellular metabolic activity.
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Affiliation(s)
- Tanoy Dutta
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, (MP), India
| | - Kaushik Pal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, (MP), India
- Department of Physics and Astronomy, Iowa State University, lowa, IA, 50011, USA
| | - Apurba L Koner
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, (MP), India.
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20
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Gupta A, Korte T, Herrmann A, Wohland T. Plasma membrane asymmetry of lipid organization: fluorescence lifetime microscopy and correlation spectroscopy analysis. J Lipid Res 2020; 61:252-266. [PMID: 31857388 PMCID: PMC6997606 DOI: 10.1194/jlr.d119000364] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 12/03/2019] [Indexed: 02/06/2023] Open
Abstract
A fundamental feature of the eukaryotic cell membrane is the asymmetric arrangement of lipids in its two leaflets. A cell invests significant energy to maintain this asymmetry and uses it to regulate important biological processes, such as apoptosis and vesiculation. The dynamic coupling of the inner or cytoplasmic and outer or exofacial leaflets is a challenging open question in membrane biology. Here, we combined fluorescence lifetime imaging microscopy (FLIM) with imaging total internal reflection fluorescence correlation spectroscopy (ITIR-FCS) to differentiate the dynamics and organization of the two leaflets of live mammalian cells. We characterized the biophysical properties of fluorescent analogs of phosphatidylcholine, sphingomyelin, and phosphatidylserine in the plasma membrane of two mammalian cell lines (CHO-K1 and RBL-2H3). Because of their specific transverse membrane distribution, these probes allowed leaflet-specific investigation of the plasma membrane. We compared the results of the two methods having different temporal and spatial resolution. Fluorescence lifetimes of fluorescent lipid analogs were in ranges characteristic for the liquid ordered phase in the outer leaflet and for the liquid disordered phase in the inner leaflet. The observation of a more fluid inner leaflet was supported by free diffusion in the inner leaflet, with high average diffusion coefficients. The liquid ordered phase in the outer leaflet was accompanied by slower diffusion and diffusion with intermittent transient trapping. Our results show that the combination of FLIM and ITIR-FCS with specific fluorescent lipid analogs is a powerful tool for investigating lateral and transbilayer characteristics of plasma membrane in live cell lines.
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Affiliation(s)
- Anjali Gupta
- Department of Biological Sciences and NUS Centre for Bio-Imaging Sciences National University of Singapore, Singapore
| | - Thomas Korte
- Institute for Biology/Biophysics, Faculty of Life Sciences, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Andreas Herrmann
- Institute for Biology/Biophysics, Faculty of Life Sciences, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Thorsten Wohland
- Department of Biological Sciences and NUS Centre for Bio-Imaging Sciences National University of Singapore, Singapore
- Department of Chemistry, National University of Singapore, Singapore
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21
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Varandas PAMM, Cobb AJA, Segundo MA, Silva EMP. Emergent Glycerophospholipid Fluorescent Probes: Synthesis and Applications. Bioconjug Chem 2019; 31:417-435. [DOI: 10.1021/acs.bioconjchem.9b00660] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Pedro A. M. M. Varandas
- LAQV, REQUIMTE, Department of Chemistry Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - Alexander J. A. Cobb
- Department of Chemistry, King’s College London, 7 Trinity Street, London SE1 1DB, United Kingdom
| | - Marcela A. Segundo
- LAQV, REQUIMTE, Department of Chemistry Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - Eduarda M. P. Silva
- LAQV, REQUIMTE, Department of Chemistry Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
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22
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Filipe HAL, Pokorná Š, Hof M, Amaro M, Loura LMS. Orientation of nitro-group governs the fluorescence lifetime of nitrobenzoxadiazole (NBD)-labeled lipids in lipid bilayers. Phys Chem Chem Phys 2019; 21:1682-1688. [PMID: 30418442 DOI: 10.1039/c8cp06064a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Nitrobenzoxadiazole (NBD) labeled lipids are popular fluorescent probes of membrane structure and dynamics, and have been widely used in both model systems and living cells. Irrespective of attachment to the lipid head group or hydrocarbon chains, the NBD fluorophore generally adopts a transverse bilayer location near the host lipid carbonyl/glycerol moieties. Still, considerable variability is observed in the measured fluorescence lifetimes, indicating that overall fluorophore location is not the determinant of NBD fluorescence properties. Combining fluorescence experiments and molecular dynamics simulations, we show that for two almost identical NBD probes, significant differences in fluorophore orientation and fluorescence lifetime are observed. Integrating these findings with literature data, we demonstrate a correlation between NBD orientation and fluorescence lifetime. The latter is longer when the NBD nitro group is predominantly oriented towards the bilayer interior, compared to probes for which it points to the water medium.
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Affiliation(s)
- Hugo A L Filipe
- Coimbra Chemistry Center, University of Coimbra, P-3004-535 Coimbra, Portugal
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23
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Martins PAT, Domingues N, Pires C, Alves AM, Palmeira T, Samelo J, Cardoso R, Velazquez-Campoy A, Moreno MJ. Molecular crowding effects on the distribution of amphiphiles in biological media. Colloids Surf B Biointerfaces 2019; 180:319-325. [PMID: 31071572 DOI: 10.1016/j.colsurfb.2019.04.065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 03/23/2019] [Accepted: 04/29/2019] [Indexed: 12/01/2022]
Abstract
Biological systems are the result of the interactions established among their many distinct molecules and molecular assemblies. The high concentration of small molecules dissolved in the aqueous media alter the water properties with important consequences in the interactions established. In this work, the effects of high concentrations of the disaccharide trehalose on the solubility of a homologous series of fluorescent amphiphiles (NBD-Cn, n=4-16) and on their interaction with a lipid bilayer and a serum protein are quantitatively characterized. Both kinetic and equilibrium aspects are reported for a better understanding of the effects observed. The aqueous solubility of the most hydrophobic amphiphiles (n ≥ 8) is strongly increased by 1 M trehalose, while no signifcant effect is observed for the most polar amphiphile (n = 4). This results from a decrease in the magnitude of the hydrophobic effect at molecular crowding conditions. A small decrease is observed on the equilibrium association with serum albumin. This is most significant for amphiphiles with longer alkyl chains, in agreement with their increased solubility in the aqueous media containing trehalose. The effects on the association of the amphiphiles with lipid bilayers are influenced by both equilibrium and kinetic aspects. On the one hand, the decreased magnitude of the hydrophobic effect leads to a decrease in the affinity of the amphiphiles towards the membrane. However, this tendency may be overbalanced by the effects on the kinetics of the interaction (insertion/desorption) due to the increase in the viscosity of the aqueous media. It is shown that the distribution of amphiphilic drugs in the crowded biological media is significantly different from that predicted from studies in dilute solutions and that the effects are dependent on the solute's hydrophobicity.
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Affiliation(s)
- Patrícia A T Martins
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal
| | - Neuza Domingues
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal; CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, 1169-056, Lisboa, Portugal
| | - Cristiana Pires
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal
| | - Ana Maria Alves
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal
| | - Tiago Palmeira
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal; CQFM-IN and IBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Jaime Samelo
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal
| | - Renato Cardoso
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal; Exogenus Therapeutics S.A, Biocant Park, 3060-197, Cantanhede, Portugal
| | - Adrian Velazquez-Campoy
- Institute of Biocomputation and Physics of Complex Systems (BIFI), Joint Units IQFR-CSIC-BIFI and GBsC-CSIC-BIFI, and Department of Biochemistry and Molecular and Cell Biology, Universidad de Zaragoza, 50018, Zaragoza, Spain; Aragon Institute for Health Research (IIS Aragon), 50009, Zaragoza, Spain; Biomedical Research Networking Centre for Liver and Digestive Diseases (CIBERehd), Madrid, Spain; Fundacion ARAID, Government of Aragon, 50018, Zaragoza, Spain
| | - Maria João Moreno
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal.
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24
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Temperature Dependence of the Structure and Dynamics of a Dye-Labeled Lipid in a Planar Phospholipid Bilayer: A Computational Study. J Membr Biol 2019; 252:227-240. [PMID: 31332471 DOI: 10.1007/s00232-019-00081-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 07/11/2019] [Indexed: 10/26/2022]
Abstract
Fluorescent probes are widely employed to label lipids for the investigation of structural and dynamic properties of model and cell membranes through optical microscopy techniques. Although the effect of tagging a lipid with an organic dye is generally assumed to be negligible, optically modified lipids can nonetheless affect the local lipid structure and, in turn, the lipid lateral mobility. To better assess this potential issue, all-atom (MD) molecular dynamics simulations have been performed to study structural and dynamic effects in a model DOPC membrane in the presence of a standard Rhodamine B-labeled DOPE lipid (RHB) as a function of temperature, i.e., 293 K, 303 K, and 320 K. As the temperature is increased, we observe similar changes in the structural properties of both pure DOPC and RHB-DOPC lipid bilayers: an increase of the area per lipid, a reduction of the membrane thickness and a decrease of lipid order parameters. The partial density profile of the RHB headgroups and their orientation within the lipid bilayer confirm the amphiphilic nature of the RHB fluorescent moiety, which mainly partitions in the DOPC glycerol backbone region at each temperature. Moreover, at all temperatures, our results on lipid lateral diffusion support a non-neutral role of the dye with respect to the unlabeled lipid mobility, thus suggesting important implications for optical microscopy studies of lipid membranes.
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Stone MRL, Masi M, Phetsang W, Pagès JM, Cooper MA, Blaskovich MAT. Fluoroquinolone-derived fluorescent probes for studies of bacterial penetration and efflux. MEDCHEMCOMM 2019; 10:901-906. [PMID: 31303987 PMCID: PMC6596217 DOI: 10.1039/c9md00124g] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 04/16/2019] [Indexed: 12/21/2022]
Abstract
Fluorescent probes derived from the fluoroquinolone antibiotic ciprofloxacin were synthesised using a Cu(i)-catalysed azide–alkyne cycloaddition (CuAAC) to link a ciprofloxacin azide derivative with alkyne-substituted green and blue fluorophores.
Fluorescent probes derived from the fluoroquinolone antibiotic ciprofloxacin were synthesised using a Cu(i)-catalysed azide–alkyne cycloaddition (CuAAC) to link a ciprofloxacin azide derivative with alkyne-substituted green and blue fluorophores. The azide (2) and fluorophore (3 and 4) derivatives retained antimicrobial activity against Gram-positive and Gram-negative bacteria. The use of confocal fluorescent microscopy showed intracellular penetration, which was substantially enhanced in the presence of carbonyl cyanide 3-chlorophenylhydrazone as an efflux pump inhibitor in Escherichia coli.
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Affiliation(s)
- M Rhia L Stone
- Institute for Molecular Bioscience , The University of Queensland , Brisbane , QLD 4072 , Australia .
| | - Muriel Masi
- Membranes et Cibles Thérapeutiques , UMR_MD1 , Inserm U1261 , Aix-Marseille Univ & IRBA , Facultés de Médecine et de Pharmacie , 27 Bd Jean Moulin , 13005 Marseille , France
| | - Wanida Phetsang
- Institute for Molecular Bioscience , The University of Queensland , Brisbane , QLD 4072 , Australia .
| | - Jean-Marie Pagès
- Membranes et Cibles Thérapeutiques , UMR_MD1 , Inserm U1261 , Aix-Marseille Univ & IRBA , Facultés de Médecine et de Pharmacie , 27 Bd Jean Moulin , 13005 Marseille , France
| | - Matthew A Cooper
- Institute for Molecular Bioscience , The University of Queensland , Brisbane , QLD 4072 , Australia .
| | - Mark A T Blaskovich
- Institute for Molecular Bioscience , The University of Queensland , Brisbane , QLD 4072 , Australia .
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26
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Pinguet CE, Ryll E, Steinschulte AA, Hoffmann JM, Brugnoni M, Sybachin A, Wöll D, Yaroslavov A, Richtering W, Plamper FA. PEO-b-PPO star-shaped polymers enhance the structural stability of electrostatically coupled liposome/polyelectrolyte complexes. PLoS One 2019; 14:e0210898. [PMID: 30653618 PMCID: PMC6336312 DOI: 10.1371/journal.pone.0210898] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 01/03/2019] [Indexed: 11/18/2022] Open
Abstract
We propose a strategy to counteract the salt-driven disassembly of multiliposomal complexes made by electrostatic co-assembly of anionic small unilamellar liposomes and cationic star-shaped polyelectrolytes (made of quaternized poly(dimethylaminoethyl methacrylate) (qPDMAEMA100)3.1). The combined action of (qPDMAEMA100)3.1 and a nonionic star-shaped polymer (PEO12-b-PPO45)4, which comprises diblock copolymer arms uniting a poly(ethylene oxide) PEO inner block and a poly(propylene oxide) PPO terminal block, leads to a stabilization of these complexes against disintegration in saline solutions. Hereby, the anchoring of the PPO terminal blocks to the lipid bilayer and the bridging between several liposomes are at the origin of the promoted structural stability. Two-focus fluorescence correlation spectroscopy verifies the formation of multiliposomal complexes with (PEO12-b-PPO45)4. The polyelectrolyte and the amphiphilic polymer work synergistically, as the joint action still assures some membrane integrity, which is not seen for the mere (PEO12-b-PPO45)4-liposome interaction alone.
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Affiliation(s)
- Camille E. Pinguet
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany
| | - Esther Ryll
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany
| | | | - Jón M. Hoffmann
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany
| | - Monia Brugnoni
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany
| | - Andrey Sybachin
- Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow, Russian Federation
| | - Dominik Wöll
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany
| | - Alexander Yaroslavov
- Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow, Russian Federation
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany
| | - Felix A. Plamper
- Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany
- Institute of Physical Chemistry, TU Bergakademie Freiberg, Freiberg, Germany
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27
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Britt HM, Mosely JA, Sanderson JM. The influence of cholesterol on melittin lipidation in neutral membranes. Phys Chem Chem Phys 2019; 21:631-640. [DOI: 10.1039/c8cp06661b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cholesterol inclusion in membranes influences the rate and selectivity of acyl transfer from lipids to a membrane-embedded peptide.
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28
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Huang W, Bender M, Seehafer K, Wacker I, Schröder RR, Bunz UHF. Novel Functional TPE Polymers: Aggregation‐Induced Emission, pH Response, and Solvatochromic Behavior. Macromol Rapid Commun 2018; 40:e1800774. [DOI: 10.1002/marc.201800774] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/21/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Wei Huang
- Organisch‐Chemisches InstitutRuprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Markus Bender
- Organisch‐Chemisches InstitutRuprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Kai Seehafer
- Organisch‐Chemisches InstitutRuprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Irene Wacker
- Cryo Electron MicroscopyUniversitatsklinikum Heidelberg, BioQuant Im Neuenheimer Feld 267 69120 Heidelberg Germany
- Centre for Advanced MaterialsRuprecht‐Karls‐Universitat Heidelberg Im Neuenheimer Feld 225 69120 Heidelberg Germany
| | - Rasmus R. Schröder
- Cryo Electron MicroscopyUniversitatsklinikum Heidelberg, BioQuant Im Neuenheimer Feld 267 69120 Heidelberg Germany
- Centre for Advanced MaterialsRuprecht‐Karls‐Universitat Heidelberg Im Neuenheimer Feld 225 69120 Heidelberg Germany
| | - Uwe H. F. Bunz
- Organisch‐Chemisches InstitutRuprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Centre for Advanced MaterialsRuprecht‐Karls‐Universitat Heidelberg Im Neuenheimer Feld 225 69120 Heidelberg Germany
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Tretiakova D, Alekseeva A, Galimzyanov T, Boldyrev A, Chernyadyev A, Ermakov Y, Batishchev O, Vodovozova E, Boldyrev I. Lateral stress profile and fluorescent lipid probes. FRET pair of probes that introduces minimal distortions into lipid packing. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2337-2347. [DOI: 10.1016/j.bbamem.2018.05.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 05/17/2018] [Accepted: 05/30/2018] [Indexed: 12/31/2022]
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30
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Gao W, Li H, Pu S. A highly selective fluorescent probe for Cu2+ based on a diarylethene with a benzo[1,2,5]oxadiazol-4-ylamine Schiff base unit. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.06.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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31
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Uttam B, Kandi R, Hussain MA, Rao CP. Fluorescent Lower Rim 1,3-Dibenzooxadiazole Conjugate of Calix[4]arene in Selective Sensing of Fluoride in Solution and in Biological Cells Using Confocal Microscopy. J Org Chem 2018; 83:11850-11859. [DOI: 10.1021/acs.joc.8b01761] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bhawna Uttam
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Ravinder Kandi
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - M. Althaf Hussain
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Chebrolu Pulla Rao
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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32
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Kameta N, Akiyama H. Shrinkable Nanotubes for Duplex Formation of Short Nucleotides. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1801967. [PMID: 30019846 DOI: 10.1002/smll.201801967] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/14/2018] [Indexed: 06/08/2023]
Abstract
Molecular monolayer nanotubes produced by self-assembly of an amphiphile modified with a 2-nitrobenzyl group as a photoresponsive unit are able to encapsulate dinucleotides via electrostatic attraction. Upon photoirradiation, the 18 nm inner diameter of the nanotubes shrinks to less than 2 nm as a result of photochemical cleavage of the 2-nitrobenzyl group in the amphiphile. This shrinking of the nanotube channels leads to a propulsive release of the dinucleotides into the bulk solution and simultaneously accelerates formation of the dinucleotide duplexes. The larger nanotube channels without photoirradiation merely release each dinucleotide into the bulk solution, indicating that the squeezing via transportation in the narrow nanotube channels is necessary for duplex formation. In addition to the size effect, water with a lower polarity confined within the narrow nanotube channels helps to stabilize the energetically unfavorable hydrogen-bonded base pair between the dinucleotides. This system should enable researchers to perform biological reactions that occur only in specific environments and conditions in living organisms.
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Affiliation(s)
- Naohiro Kameta
- Department of Materials and Chemistry, Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Haruhisa Akiyama
- Department of Materials and Chemistry, Research Institute for Sustainable Chemistry, AIST, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
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33
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Determination of the fluorescence labels location in lipid bilayer based on fluorescence quenching. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.02.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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34
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Location of fluorescent probes (2′-hydroxy derivatives of 2,5-diaryl-1,3-oxazole) in lipid membrane studied by fluorescence spectroscopy and molecular dynamics simulation. Biophys Chem 2018; 235:9-18. [DOI: 10.1016/j.bpc.2018.01.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 01/26/2018] [Accepted: 01/28/2018] [Indexed: 11/20/2022]
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35
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González-Pérez M, Ooi SY, Martins S, Prates Ramalho JP, Pereira A, Caldeira AT. Gaining insight into the photophysical properties of a coumarin STP ester with potential for bioconjugation. NEW J CHEM 2018. [DOI: 10.1039/c8nj03548b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The photophysical properties of a coumarin 392 4-sulfotetrafluorophenyl ester, C392STP (sodium (E/Z)-4-(4-(2-(6,7-dimethoxycoumarin-3-yl)vinyl)-benzoyl)-2,3,5,6-tetrafluoro-benzenesulfonate), an amine reactive coumarine with potential for bioconjungation, have been studied in different solvents.
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Affiliation(s)
| | - S. Y. Ooi
- Chemistry Department
- School of Sciences and Technology
- Evora University
- Evora
- Portugal
| | - S. Martins
- HERCULES Laboratory
- Evora University
- Evora
- Portugal
| | | | - A. Pereira
- HERCULES Laboratory
- Evora University
- Evora
- Portugal
- Chemistry Department
| | - A. T. Caldeira
- HERCULES Laboratory
- Evora University
- Evora
- Portugal
- Chemistry Department
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36
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Coreta-Gomes FM, Vaz WLC, Moreno MJ. Effect of Acyl Chain Length on the Rate of Phospholipid Flip-Flop and Intermembrane Transfer. J Membr Biol 2017; 251:431-442. [PMID: 29264685 DOI: 10.1007/s00232-017-0009-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 12/13/2017] [Indexed: 11/25/2022]
Abstract
The rate at which phospholipids equilibrate between different membranes and between the non-polar environments in biological fluids is of high importance in the understanding of biomembrane diversity, as well as in the development of liposomes for drug delivery. In this work, we characterize the rate of insertion into and desorption from POPC bilayers for a homologous series of amphiphiles with the fluorescent NBD group attached to phosphoethanolamines of different acyl chain lengths, NBD-diC n -PE with n = 6, 8, 10, and 12. The rate of translocation between bilayer leaflets was also characterized, providing all the relevant parameters for their interaction with lipid bilayers. The results are complemented with data for NBD-diC14-PE obtained from literature (Abreu et al. Biophys J 87:353-365, 2004; Moreno et al. Biophys J 91:873-881, 2006). The rate of translocation between the POPC leaflets is not dependent on the length of the acyl chains, while this affects strongly the rate of desorption from the bilayer. Insertion in the POPC bilayer is not diffusion controlled showing a significant dependence on the acyl chain length and on temperature. The results obtained are compared with those previously reported for NBD-LysoC14-PE (Sampaio et al. Biophys J 88:4064-4071, 2005), and with the homologous series of single chain amphiphiles NBD-C n (Cardoso et al. J Phys Chem B 114:16337-16346, 2010; J Phys Chem B 115:10098-10108, 2011). This allows the establishment of important relations between the rate constants for interaction with the lipid bilayers and the structural properties of the amphiphiles, namely the total surface and the cross-section of their non-polar region.
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Affiliation(s)
- Filipe M Coreta-Gomes
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal
- QOPNA, Chemistry Department, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Winchil L C Vaz
- CEDOC, NOVA Medical School, Faculdadede Ciências Médicas, Universidade NOVA de Lisboa, 1169-056, Lisbon, Portugal
| | - Maria J Moreno
- CQC-Biological Chemistry Group, Chemistry Department FCTUC, Largo D. Dinis, Rua Larga, 3004-535, Coimbra, Portugal.
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37
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Concilio S, Ferrentino I, Sessa L, Massa A, Iannelli P, Diana R, Panunzi B, Rella A, Piotto S. A novel fluorescent solvatochromic probe for lipid bilayers. Supramol Chem 2017. [DOI: 10.1080/10610278.2017.1372583] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Simona Concilio
- Department of Industrial Engineering, University of Salerno, Fisciano, Italy
| | | | - Lucia Sessa
- Department of Pharmacy, University of Salerno, Fisciano, Italy
| | - Antonio Massa
- Department of Chemistry and Biology, University of Salerno, Fisciano, Italy
| | - Pio Iannelli
- Department of Pharmacy, University of Salerno, Fisciano, Italy
| | - Rosita Diana
- Department of Chemical Science, University of Napoli Federico II, Napoli, Italy
| | - Barbara Panunzi
- Department of Agriculture, University of Napoli Federico II, Portici, Italy
| | - Antonella Rella
- Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Stefano Piotto
- Department of Pharmacy, University of Salerno, Fisciano, Italy
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38
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Tokunaga T, Watanabe B, Sato S, Kawamoto J, Kurihara T. Synthesis and Functional Assessment of a Novel Fatty Acid Probe, ω-Ethynyl Eicosapentaenoic Acid Analog, to Analyze the in Vivo Behavior of Eicosapentaenoic Acid. Bioconjug Chem 2017; 28:2077-2085. [PMID: 28682621 DOI: 10.1021/acs.bioconjchem.7b00235] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Eicosapentaenoic acid (EPA) is an ω-3 polyunsaturated fatty acid that plays various beneficial roles in organisms from bacteria to humans. Although its beneficial physiological functions are well-recognized, a molecular probe that enables the monitoring of its in vivo behavior without abolishing its native functions has not yet been developed. Here, we designed and synthesized an ω-ethynyl EPA analog (eEPA) as a tool for analyzing the in vivo behavior and function of EPA. eEPA has an ω-ethynyl group tag in place of the ω-methyl group of EPA. An ethynyl group has a characteristic Raman signal and can be visualized by Raman scattering microscopy. Moreover, this group can specifically react in situ with azide compounds, such as those with fluorescent group, via click chemistry. In this study, we first synthesized eEPA efficiently based on the following well-known strategies. To introduce four C-C double bonds, a coupling reaction between terminal acetylene and propargylic halide or tosylate was employed, and then, by simultaneous and stereoselective partial hydrogenation with P-2 nickel, the triple bonds were converted to cis double bonds. One double bond and an ω-terminal C-C triple bond were introduced by Wittig reaction with a phosphonium salt harboring an ethynyl group. Then, we evaluated the in vivo function of the resulting probe by using an EPA-producing bacterium, Shewanella livingstonensis Ac10. This cold-adapted bacterium inducibly produces EPA at low temperatures, and the EPA-deficient mutant (ΔEPA) shows growth retardation and abnormal morphology at low temperatures. When eEPA was exogenously supplemented to ΔEPA, eEPA was incorporated into the membrane phospholipids as an acyl chain, and the amount of eEPA was about 5% of the total fatty acids in the membrane, which is comparable to the amount of EPA in the membrane of the parent strain. Notably, by supplementation with eEPA, the growth retardation and abnormal morphology of ΔEPA were almost completely suppressed. These results indicated that eEPA mimics EPA well and is useful for analyzing the in vivo behavior of EPA.
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Affiliation(s)
- Tomohisa Tokunaga
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Bunta Watanabe
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Sho Sato
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Jun Kawamoto
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Tatsuo Kurihara
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
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39
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Singh MK, Shweta H, Khan MF, Sen S. New insight into probe-location dependent polarity and hydration at lipid/water interfaces: comparison between gel- and fluid-phases of lipid bilayers. Phys Chem Chem Phys 2016; 18:24185-97. [DOI: 10.1039/c6cp01201a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Location dependent polarity and hydration probed by a new series of 4-aminophthalimide-based fluorescent molecules (4AP-Cn;n= 2–10, 12) show different behaviour at gel- and fluid-phase lipid/water interfaces.
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Affiliation(s)
- Moirangthem Kiran Singh
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Him Shweta
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Mohammad Firoz Khan
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Sobhan Sen
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
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