1
|
Qi C, Li X, Li Q, Shi X, Xia MC, Chen Y, Wang Z, Abliz Z. Mass Spectrometry Imaging for the Characterization of C═C Localization in Unsaturated Lipid Isomers at the Single-Cell Level. Anal Chem 2024. [PMID: 39269953 DOI: 10.1021/acs.analchem.4c03679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2024]
Abstract
Unsaturated lipids with carbon-carbon double bonds (C═C) have been implicated in the pathogenesis of various diseases. While mass spectrometry imaging (MSI) has been employed to map the distribution of lipid isomers in tissue sections, the identification of lipid C═C positional isomers at the single-cell level using MSI poses a significant challenge. In this study, we developed a novel approach utilizing ToF-SIMS in conjunction with the Paternò-Büchi (P-B) photochemical reaction to characterize the C═C localization in unsaturated lipid isomers at the single-cell level. The P-B reaction was employed to produce adduct products, which were subsequently subjected to collision-induced dissociation by the primary ion beam of ToF-SIMS to generate characteristic ion pairs indicative of the presence of C═C bonds. Utilizing this approach, lipid isomers in brain and skeletal tissues from mice, as well as different cell lines, were visualized at single-cell resolution. Furthermore, distinct variations in the composition of FA 18:1 isomers across different microregions and cell types were revealed. Our P-B ToF-SIMS approach enables the accurate identification and characterization of complex lipid structures with remarkable spatial resolution and can be helpful in understanding the physiological role of these C═C positional isomers.
Collapse
Affiliation(s)
- Chengjian Qi
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Center for Imaging and Systems Biology, College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Xiaoni Li
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Center for Imaging and Systems Biology, College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Qian Li
- Key Laboratory of Ethnomedicine of Ministry of Education, School of Pharmacy, Minzu University of China, Beijing 100081, China
| | - Xiujuan Shi
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Center for Imaging and Systems Biology, College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Meng-Chan Xia
- National Narcotics Laboratory Beijing Regional Center, Beijing 100164, China
| | - Yanhua Chen
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Center for Imaging and Systems Biology, College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
- Beijing Engineering Research Center of Food Environment and Public Health, Minzu University of China, Beijing 100081, China
| | - Zhaoying Wang
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Center for Imaging and Systems Biology, College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
- Beijing Engineering Research Center of Food Environment and Public Health, Minzu University of China, Beijing 100081, China
| | - Zeper Abliz
- Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Center for Imaging and Systems Biology, College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
- Key Laboratory of Ethnomedicine of Ministry of Education, School of Pharmacy, Minzu University of China, Beijing 100081, China
| |
Collapse
|
2
|
Synthesis of Spin-Labeled Ibuprofen and Its Interaction with Lipid Membranes. Molecules 2022; 27:molecules27134127. [PMID: 35807376 PMCID: PMC9268589 DOI: 10.3390/molecules27134127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Revised: 06/22/2022] [Accepted: 06/24/2022] [Indexed: 02/04/2023] Open
Abstract
Ibuprofen is a non-steroidal anti-inflammatory drug possessing analgesic and antipyretic activity. Electron paramagnetic resonance (EPR) spectroscopy could be applied to study its interaction with biological membranes and proteins if its spin-labeled analogs were synthesized. Here, a simple sequence of ibuprofen transformations—nitration, esterification, reduction, Sandmeyer reaction, Sonogashira cross-coupling, oxidation and saponification—was developed to attain this goal. The synthesis resulted in spin-labeled ibuprofen (ibuprofen-SL) in which the spin label TEMPOL is attached to the benzene ring. EPR spectra confirmed interaction of ibuprofen-SL with 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) bilayers. Using 2H electron spin echo envelope modulation (ESEEM) spectroscopy, ibuprofen-SL was found to be embedded into the hydrophobic bilayer interior.
Collapse
|
3
|
Smorygina AS, Golysheva EA, Dzuba SA. Clustering of Stearic Acids in Model Phospholipid Membranes Revealed by Double Electron-Electron Resonance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13909-13916. [PMID: 34787421 DOI: 10.1021/acs.langmuir.1c02460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Free fatty acids play various important roles in biological membranes. Double electron-electron resonance spectroscopy (DEER, also known as PELDOR) of spin-labeled biomolecules is capable of studying magnetic dipole-dipole (d-d) interactions between spin labels at the nanoscale range of distances. Here, DEER is applied to study intermolecular d-d interactions between doxyl-spin-labeled stearic acids (DSA) in gel-phase phospholipid bilayers composed either of an equimolecular mixture of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and 1,2-dioleoyl-sn-glycero-3-phosphocholine or of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine. DEER data obtained for different DSA concentrations showed that DSA molecules at their concentration in the bilayer χ larger than 0.5 mol % are assembled into lateral lipid-mediated clusters, with a characteristic intermolecular distance of 2 nm. Some evidences were obtained indicating that clusters may consist of "subclusters", alternatively appearing in two opposite leaflets. Conventional electron paramagnetic resonance (EPR) spectra for the gel-phase bilayers showed that for χ larger than 2 mol % the molecules in the clusters stick together, forming oligomers. Room-temperature EPR spectra for the liquid-crystalline phase were found to change noticeably for χ larger than 0.5 mol %, which may indicate the clustering in a liquid-crystalline phase similar to that observed by DEER in the gel phase.
Collapse
Affiliation(s)
- Anna S Smorygina
- Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - Elena A Golysheva
- Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - Sergei A Dzuba
- Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Novosibirsk 630090, Russia
- Department of Physics, Novosibirsk State University, Novosibirsk 630090, Russia
| |
Collapse
|
4
|
Róg T, Girych M, Bunker A. Mechanistic Understanding from Molecular Dynamics in Pharmaceutical Research 2: Lipid Membrane in Drug Design. Pharmaceuticals (Basel) 2021; 14:1062. [PMID: 34681286 PMCID: PMC8537670 DOI: 10.3390/ph14101062] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 11/17/2022] Open
Abstract
We review the use of molecular dynamics (MD) simulation as a drug design tool in the context of the role that the lipid membrane can play in drug action, i.e., the interaction between candidate drug molecules and lipid membranes. In the standard "lock and key" paradigm, only the interaction between the drug and a specific active site of a specific protein is considered; the environment in which the drug acts is, from a biophysical perspective, far more complex than this. The possible mechanisms though which a drug can be designed to tinker with physiological processes are significantly broader than merely fitting to a single active site of a single protein. In this paper, we focus on the role of the lipid membrane, arguably the most important element outside the proteins themselves, as a case study. We discuss work that has been carried out, using MD simulation, concerning the transfection of drugs through membranes that act as biological barriers in the path of the drugs, the behavior of drug molecules within membranes, how their collective behavior can affect the structure and properties of the membrane and, finally, the role lipid membranes, to which the vast majority of drug target proteins are associated, can play in mediating the interaction between drug and target protein. This review paper is the second in a two-part series covering MD simulation as a tool in pharmaceutical research; both are designed as pedagogical review papers aimed at both pharmaceutical scientists interested in exploring how the tool of MD simulation can be applied to their research and computational scientists interested in exploring the possibility of a pharmaceutical context for their research.
Collapse
Affiliation(s)
- Tomasz Róg
- Department of Physics, University of Helsinki, 00014 Helsinki, Finland;
| | - Mykhailo Girych
- Department of Physics, University of Helsinki, 00014 Helsinki, Finland;
| | - Alex Bunker
- Drug Research Program, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, 00014 Helsinki, Finland;
| |
Collapse
|
5
|
Complexity of seemingly simple lipid nanodiscs. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183420. [DOI: 10.1016/j.bbamem.2020.183420] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 06/26/2020] [Accepted: 07/07/2020] [Indexed: 12/15/2022]
|
6
|
Schmallegger M, Barbon A, Bortolus M, Chemelli A, Bilkis I, Gescheidt G, Weiner L. Systematic Quantification of Electron Transfer in a Bare Phospholipid Membrane Using Nitroxide-Labeled Stearic Acids: Distance Dependence, Kinetics, and Activation Parameters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:10429-10437. [PMID: 32787070 PMCID: PMC7586382 DOI: 10.1021/acs.langmuir.0c01585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/24/2020] [Indexed: 06/11/2023]
Abstract
In this report, we present a method to characterize the kinetics of electron transfer across the bilayer of a unilamellar liposome composed of 1,2-dimyristoyl-sn-glycero-3-phosphocholine. The method utilizes synthetic phospholipids containing noninvasive nitroxide spin labels having the >N-O• moiety at well-defined distances from the outer surface of the liposome to serve as reporters for their local environment and, at the same time, permit measurement of the kinetics of electron transfer. We used 5-doxyl and 16-doxyl stearic acids. The paramagnetic >N-O• moiety is photo-oxidized to the corresponding diamagnetic oxoammonium cation by a ruthenium electron acceptor formed in the solution. Electron transfer is monitored by three independent spectroscopic methods: by both steady-state and time-resolved electron paramagnetic resonance and by optical spectroscopy. These techniques allowed us to differentiate between the electron transfer rates of nitroxides located in the outer leaflet of the phospholipid bilayer and of those located in the inner leaflet. Measurement of electron transfer rates as a function of temperature revealed a low-activation barrier (ΔG‡ ∼ 40 kJ/mol) that supports a tunneling mechanism.
Collapse
Affiliation(s)
- Max Schmallegger
- Institute
of Physical and Theoretical Chemistry, Graz
University of Technology, Stremayrgasse 9, Graz 8010, Austria
| | - Antonio Barbon
- Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via Marzolo 1, Padova 35131, Italy
| | - Marco Bortolus
- Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via Marzolo 1, Padova 35131, Italy
| | - Angela Chemelli
- Institute
of Inorganic Chemistry, Graz University
of Technology, Stremayrgasse 9, Graz 8010, Austria
| | - Itzhak Bilkis
- Faculty
of Agricultural, Food and Environmental Sciences, Hebrew University, Rehovot 76100, Israel
| | - Georg Gescheidt
- Institute
of Physical and Theoretical Chemistry, Graz
University of Technology, Stremayrgasse 9, Graz 8010, Austria
| | - Lev Weiner
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 76100, Israel
| |
Collapse
|
7
|
Shao S, Do TN, Razi A, Chitgupi U, Geng J, Alsop RJ, Dzikovski BG, Rheinstädter MC, Ortega J, Karttunen M, Spernyak JA, Lovell JF. Design of Hydrated Porphyrin-Phospholipid Bilayers with Enhanced Magnetic Resonance Contrast. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:10.1002/smll.201602505. [PMID: 27739249 PMCID: PMC5209247 DOI: 10.1002/smll.201602505] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 08/30/2016] [Indexed: 05/29/2023]
Abstract
Computer simulations are used to design more hydrated bilayers, formed from amine-modified porphyrin-phospholipids (PoPs). Experiments confirm that the new constructs give rise to bilayers with greater water content. When chelated with manganese, amine-modified PoPs provide improved contrast for magnetic resonance and are safely used for imaging in vivo.
Collapse
Affiliation(s)
- Shuai Shao
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York 14260, USA
| | - Trang Nhu Do
- Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada
| | - Aida Razi
- Department of Biochemistry and Biomedical Sciences and M. G. DeGroote Institute for Infectious Diseases Research, McMaster University, Hamilton, Ontario L8S4L8, Canada
| | - Upendra Chitgupi
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York 14260, USA
| | - Jumin Geng
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York 14260, USA
| | - Richard J. Alsop
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S4M1, Canada
| | - Boris G. Dzikovski
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
| | - Maikel C Rheinstädter
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S4M1, Canada
| | - Joaquin Ortega
- Department of Biochemistry and Biomedical Sciences and M. G. DeGroote Institute for Infectious Diseases Research, McMaster University, Hamilton, Ontario L8S4L8, Canada
| | - Mikko Karttunen
- Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada. Department of Mathematics and Computer Science & Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, Netherlands
| | - Joseph A. Spernyak
- Department of Cell Stress Biology, Roswell Park Cancer Institute Buffalo, NY 14263, USA
| | - Jonathan F. Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York 14260, USA
| |
Collapse
|
8
|
Kepczynski M, Róg T. Functionalized lipids and surfactants for specific applications. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2362-2379. [PMID: 26946243 DOI: 10.1016/j.bbamem.2016.02.038] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 02/23/2016] [Accepted: 02/25/2016] [Indexed: 12/17/2022]
Abstract
Synthetic lipids and surfactants that do not exist in biological systems have been used for the last few decades in both basic and applied science. The most notable applications for synthetic lipids and surfactants are drug delivery, gene transfection, as reporting molecules, and as support for structural lipid biology. In this review, we describe the potential of the synergistic combination of computational and experimental methodologies to study the behavior of synthetic lipids and surfactants embedded in lipid membranes and liposomes. We focused on select cases in which molecular dynamics simulations were used to complement experimental studies aiming to understand the structure and properties of new compounds at the atomistic level. We also describe cases in which molecular dynamics simulations were used to design new synthetic lipids and surfactants, as well as emerging fields for the application of these compounds. This article is part of a Special Issue entitled: Biosimulations edited by Ilpo Vattulainen and Tomasz Róg.
Collapse
Affiliation(s)
- Mariusz Kepczynski
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland.
| | - Tomasz Róg
- Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101, Tampere, Finland; Department of Physics, Helsinki University, P.O. Box 64, FI 00014 Helsinki, Finland.
| |
Collapse
|
9
|
Faller R. Molecular modeling of lipid probes and their influence on the membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2353-2361. [PMID: 26891817 DOI: 10.1016/j.bbamem.2016.02.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Revised: 02/08/2016] [Accepted: 02/09/2016] [Indexed: 01/03/2023]
Abstract
In this review a number of Molecular Dynamics simulation studies are discussed which focus on the understanding of the behavior of lipid probes in biomembranes. Experiments often use specialized probe moieties or molecules to report on the behavior of a membrane and try to gain information on the membrane as a whole from the probe lipids as these probes are the only things an experiment sees. Probes can be used to make NMR, EPR and fluorescence accessible to the membrane and use fluorescent or spin-active moieties for this purpose. Clearly membranes with and without probes are not identical which makes it worthwhile to elucidate the differences between them with detailed atomistic simulations. In almost all cases these differences are confined to the local neighborhood of the probe molecules which are sparsely used and generally present as single molecules. In general, the behavior of the bulk membrane lipids can be qualitatively understood from the probes but in most cases their properties cannot be directly quantitatively deduced from the probe behavior. This article is part of a Special Issue entitled: Biosimulations edited by Ilpo Vattulainen and Tomasz Róg.
Collapse
Affiliation(s)
- Roland Faller
- Department of Chemical Engineering & Materials Science, University of California-Davis, Davis, CA 95616, USA.
| |
Collapse
|
10
|
Dzieciuch M, Rissanen S, Szydłowska N, Bunker A, Kumorek M, Jamróz D, Vattulainen I, Nowakowska M, Róg T, Kepczynski M. PEGylated Liposomes as Carriers of Hydrophobic Porphyrins. J Phys Chem B 2015; 119:6646-57. [DOI: 10.1021/acs.jpcb.5b01351] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Monika Dzieciuch
- Faculty
of Chemistry, Jagiellonian University, Krakow 31-007, Poland
| | - Sami Rissanen
- Department
of Physics, Tampere University of Technology, Tampere 33720, Finland
| | | | - Alex Bunker
- Centre
for Drug Research, Faculty of Pharmacy, University of Helsinki, Helsinki 00100, Finland
| | - Marta Kumorek
- Faculty
of Chemistry, Jagiellonian University, Krakow 31-007, Poland
| | - Dorota Jamróz
- Faculty
of Chemistry, Jagiellonian University, Krakow 31-007, Poland
| | - Ilpo Vattulainen
- Department
of Physics, Tampere University of Technology, Tampere 33720, Finland
- MEMPHYS-Center
for Biomembrane Physics, University of Southern Denmark, Odense 5230, Denmark
| | - Maria Nowakowska
- Faculty
of Chemistry, Jagiellonian University, Krakow 31-007, Poland
| | - Tomasz Róg
- Department
of Physics, Tampere University of Technology, Tampere 33720, Finland
| | | |
Collapse
|
11
|
Urbančič I, Ljubetič A, Štrancar J. Resolving Internal Motional Correlations to Complete the Conformational Entropy Meter. J Phys Chem Lett 2014; 5:3593-3600. [PMID: 26278615 DOI: 10.1021/jz5020828] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Conformational entropy (SΩ) has long been used to theoretically characterize the dynamics of proteins, DNA, and other polymers. Though recent advances enabled its calculation also from simulations and nuclear magnetic resonance (NMR) relaxation experiments, correlated molecular motion has hitherto greatly hindered both numerical and experimental determination, requiring demanding empirical and computational calibrations. Herein, we show that these motional correlations can be estimated directly from the temperature-dependent SΩ series that reveal effective persistence lengths of the polymers, which we demonstrate by measuring SΩ of amphiphilic molecules in model lipid systems by spin-labeling electron paramagnetic resonance (EPR) spectroscopy. We validate our correlation-corrected SΩ meter against the basic biophysical interactions underlying biomembrane formation and stability, against the changes in enthalpy and diffusion coefficients upon phase transitions, and against the energetics of fatty acid dissociation. As the method can be directly applied to conformational analysis of proteins and other polymers, as well as adapted to NMR or polarized fluorescence techniques, we believe that the approach can greatly enrich the scope of experimentally available statistical thermodynamics, offering new physical insights into the behavior of biomolecules.
Collapse
Affiliation(s)
- Iztok Urbančič
- Laboratory of Biophysics, Condensed Matter Physics Department, "Jožef Stefan" Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
| | - Ajasja Ljubetič
- Laboratory of Biophysics, Condensed Matter Physics Department, "Jožef Stefan" Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
| | - Janez Štrancar
- Laboratory of Biophysics, Condensed Matter Physics Department, "Jožef Stefan" Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
| |
Collapse
|
12
|
Koklic T. Perifosine induced release of contents of trans cell-barrier transport efficient liposomes. Chem Phys Lipids 2014; 183:50-9. [DOI: 10.1016/j.chemphyslip.2014.05.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Revised: 05/13/2014] [Accepted: 05/15/2014] [Indexed: 01/10/2023]
|
13
|
Sommer LAM, Janke JJ, Bennett WFD, Bürck J, Ulrich AS, Tieleman DP, Dames SA. Characterization of the Immersion Properties of the Peripheral Membrane Anchor of the FATC Domain of the Kinase “Target of Rapamycin” by NMR, Oriented CD Spectroscopy, and MD Simulations. J Phys Chem B 2014; 118:4817-31. [DOI: 10.1021/jp501533d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lisa A. M. Sommer
- Chair
of Biomolecular NMR Spectroscopy, Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
| | - J. Joel Janke
- Department
of Biological Sciences and Institute for Biocomplexity and Informatics, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - W. F. Drew Bennett
- Department
of Biological Sciences and Institute for Biocomplexity and Informatics, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Jochen Bürck
- Karlsruhe Institute of Technology (KIT), Institute of Biological Interfaces (IBG-2), P.O.B.
3640, 76021 Karlsruhe, Germany
| | - Anne S. Ulrich
- Karlsruhe Institute of Technology (KIT), Institute of Biological Interfaces (IBG-2), P.O.B.
3640, 76021 Karlsruhe, Germany
| | - D. Peter Tieleman
- Department
of Biological Sciences and Institute for Biocomplexity and Informatics, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Sonja A. Dames
- Chair
of Biomolecular NMR Spectroscopy, Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
- Institute
of Structural Biology, Helmholtz Zentrum München, Ingolstädter
Landstrasse 1, 85764 Neuherberg, Germany
| |
Collapse
|
14
|
Kemmerer S, Voss JC, Faller R. Molecular dynamics simulation of dipalmitoylphosphatidylcholine modified with a MTSL nitroxide spin label in a lipid membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:2770-7. [DOI: 10.1016/j.bbamem.2013.07.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 07/22/2013] [Accepted: 07/31/2013] [Indexed: 11/16/2022]
|
15
|
Yonar D, Horasan N, Paktaş DD, Abramović Z, Štrancar J, Sünnetçioğlu MM, Šentjurc M. Interaction of Antidepressant Drug, Clomipramine, with Model and Biological Stratum Corneum Membrane as Studied by Electron Paramagnetic Resonance. J Pharm Sci 2013; 102:3762-72. [DOI: 10.1002/jps.23687] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 06/19/2013] [Accepted: 07/10/2013] [Indexed: 11/06/2022]
|
16
|
Kyrychenko A, Ladokhin AS. Molecular dynamics simulations of depth distribution of spin-labeled phospholipids within lipid bilayer. J Phys Chem B 2013; 117:5875-85. [PMID: 23614631 DOI: 10.1021/jp4026706] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Spin-labeled lipids are commonly used as fluorescence quenchers in studies of membrane penetration of dye-labeled proteins and peptides using depth-dependent quenching. Accurate calculations of depth of the fluorophore rely on the use of several spin labels placed in the membrane at various positions. The depth of the quenchers (spin probes) has to be determined independently; however, experimental determination of transverse distributions of spin probe depths is difficult. In this Article, we use molecular dynamics (MD) simulations to study the membrane behavior and depth distributions of spin-labeled phospholipids in a 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) bilayer. To probe different depths within the bilayer, a series containing five Doxyl-labeled lipids (n-Doxyl PC) has been studied, in which a spin moiety was covalently attached to nth carbon atoms (where n = 5, 7, 10, 12, and 14) of the sn-2 stearoyl chain of the host phospholipid. Our results demonstrate that the chain-attached spin labels are broadly distributed across the model membrane and their environment is characterized by a high degree of mobility and structural heterogeneity. Despite the high thermal disorder, the depth distributions of the Doxyl labels were found to correlate well with their attachment positions, indicating that the distribution of the spin label within the model membrane is dictated by the depth of the nth lipid carbon atom and not by intrinsic properties of the label. In contrast, a much broader and heterogeneous distribution was observed for a headgroup-attached Tempo spin label of Tempo-PC lipids. MD simulations reveal that, due to the hydrophobic nature, a Tempo moiety favors partitioning from the headgroup region deeper into the membrane. Depending on the concentration of Tempo-PC lipids, the probable depth of the Tempo moiety could span a range from 14.4 to 18.2 Å from the membrane center. Comparison of the MD-estimated immersion depths of Tempo and n-Doxyl labels with their suggested experimental depth positions allows us to review critically the possible sources of error in depth-dependent fluorescence quenching studies.
Collapse
Affiliation(s)
- Alexander Kyrychenko
- Department of Biochemistry and Molecular Biology, Kansas University Medical Center, Kansas City, Kansas 66160-7421, USA.
| | | |
Collapse
|
17
|
Lipid peroxidation and water penetration in lipid bilayers: a W-band EPR study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1828:510-7. [PMID: 23036933 DOI: 10.1016/j.bbamem.2012.09.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 09/24/2012] [Accepted: 09/25/2012] [Indexed: 11/20/2022]
Abstract
Lipid peroxidation plays a key role in the alteration of cell membrane's properties. Here we used as model systems multilamellar vesicles (MLVs) made of the first two products in the oxidative cascade of linoleoyl lecithin, namely 1-palmitoyl-2-(13-hydroperoxy-9,11-octadecanedienoyl)-lecithin (HpPLPC) and 1-palmitoyl-2-(13-hydroxy-9,11-octadecanedienoyl)-lecithin (OHPLPC), exhibiting a hydroperoxide or a hydroxy group at position 13, respectively. The two oxidized lipids were used either pure or in a 1:1 molar ratio mixture with untreated 1-palmitoyl-2-linoleoyl-lecithin (PLPC). The model membranes were doped with spin-labeled lipids to study bilayer alterations by electron paramagnetic resonance (EPR) spectroscopy. Two different spin-labeled lipids were used, bearing the doxyl ring at position (n) 5 or 16: γ-palmitoyl-β-(n-doxylstearoyl)-lecithin (n-DSPPC) and n-doxylstearic acid (n-DSA). Small changes in the acyl chain order in the sub-polar region and at the methyl-terminal induced by lipid peroxidation were detected by X-band EPR. Concomitantly, the polarity and proticity of the membrane bilayer in those regions were investigated at W band in frozen samples. Analysis of the g(xx) and A(zz) parameters revealed that OHPLPC, but mostly HpPLPC, induced a measurable increase in polarity and H-bonding propensity in the central region of the bilayer. Molecular dynamics simulation performed on 16-DSA in the PLPC-HpPLPC bilayer revealed that water molecules are statistically favored with respect to the hydroperoxide groups to interact with the nitroxide at the methyl-terminal, confirming that the H-bonds experimentally observed are due to increased water penetration in the bilayer. The EPR and MD data on model membranes demonstrate that cell membrane damage by oxidative stress cause alteration of water penetration in the bilayer.
Collapse
|
18
|
Wong-Ekkabut J, Karttunen M. Assessment of Common Simulation Protocols for Simulations of Nanopores, Membrane Proteins, and Channels. J Chem Theory Comput 2012; 8:2905-11. [PMID: 26592129 DOI: 10.1021/ct3001359] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Molecular dynamics (MD) simulation has become a common technique to study biological systems. Transport of small molecules through carbon nanotubes and membrane proteins has been an intensely studied topic, and MD simulations have been able to provide valuable predictions, many of which have later been experimentally proven. Simulations of such systems pose challenges, and unexpected problems in commonly used protocols and methods have been found in the past few years. The two main reasons why some were not found before are that most of these newly discovered errors do not lead to unstable simulations. Furthermore, some of them manifest themselves only after relatively long simulation times. We assessed the reliability of the most common simulations protocols by MD and stochastic dynamics (SD) or Langevin dynamics, simulations of an alpha hemolysin nanochannel embedded in a palmitoyloleoylphosphatidylcholine (POPC) lipid bilayer. Our findings are that (a) reaction field electrostatics should not be used in simulations of such systems, (b) local thermostats should be preferred over global ones since the latter may lead to an unphysical temperature distribution,
Collapse
Affiliation(s)
- Jirasak Wong-Ekkabut
- Department of Physics, Faculty of Science, Kasetsart University , 50 Phahon Yothin Road, Chatuchak, Bangkok 10900, Thailand
| | - Mikko Karttunen
- Department of Chemistry, University of Waterloo , 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
| |
Collapse
|
19
|
O'Young J, Liao Y, Xiao Y, Jalkanen J, Lajoie G, Karttunen M, Goldberg HA, Hunter GK. Matrix Gla protein inhibits ectopic calcification by a direct interaction with hydroxyapatite crystals. J Am Chem Soc 2011; 133:18406-12. [PMID: 21961692 DOI: 10.1021/ja207628k] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Mice lacking the gene encoding matrix gla protein (MGP) exhibit massive mineral deposition in blood vessels and die soon after birth. We hypothesize that MGP prevents arterial calcification by adsorbing to growing hydroxyapatite (HA) crystals. To test this, we have used a combined experimental-computational approach. We synthesized peptides covering the entire sequence of human MGP, which contains three sites of serine phosphorylation and five sites of γ-carboxylation, and studied their effects on HA crystal growth using a constant-composition autotitration assay. In parallel studies, the interactions of these sequences with the {100} and {001} faces of HA were analyzed using atomistic molecular dynamics (MD) simulations. YGlapS (amino acids 1-14 of human MGP) and SK-Gla (MGP43-56) adsorbed rapidly to the {100} and {001} faces and strongly inhibited HA growth (IC(50) = 2.96 μg/mL and 4.96 μg/mL, respectively). QR-Gla (MGP29-42) adsorbed more slowly and was a moderate growth inhibitor, while the remaining three (nonpost-translationally modified) peptides had little or no effect in either analysis. Substitution of gla with glutamic acid reduced the adsorption and inhibition activities of SK-Gla and (to a lesser extent) QR-Gla but not YGlapS; substitution of phosphoserine with serine reduced the inhibitory potency of YGlapS. These studies suggest that MGP prevents arterial calcification by a direct interaction with HA crystals that involves both phosphate groups and gla residues of the protein. The strong correlation between simulated adsorption and measured growth inhibition indicates that MD provides a powerful tool to predict the effects of proteins and peptides on crystal formation.
Collapse
Affiliation(s)
- Jason O'Young
- School of Dentistry, University of Western Ontario, London, Canada
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Kepczynski M, Kumorek M, Stepniewski M, Róg T, Kozik B, Jamróz D, Bednar J, Nowakowska M. Behavior of 2,6-bis(decyloxy)naphthalene inside lipid bilayer. J Phys Chem B 2010; 114:15483-94. [PMID: 21058682 DOI: 10.1021/jp103753f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Interactions between small organic molecules and lipid or cell membranes are important because of their role in the distribution of biologically active substances inside the membrane and their permeation through the cell membranes. In the current paper, we have explored the effect of the attachment of long hydrocarbon tails on the behavior of small organic molecule inside the lipid membrane. Naphthalene with two decyloxy groups attached at the opposite sites of the ring (2,6-bis(decyloxy)naphthalene, 3) was synthesized and incorporated into phosphatidylcholine (PC) vesicles. Fluorescence methods as well as molecular dynamic (MD) simulations were used to estimate the position, orientation, and migration of compound 3 in PC bilayer. It was found that the naphthalene ring of compound 3 resides in the upper acyl chain region of the bilayer and the hydrocarbon tails are directed to the center of the bilayer. As was shown with cryotransmission electron microscopy (cryo-TEM), such lipidlike conformation enables compound 3 to be incorporated into liposomes at a very high content without their disintegration. Moreover, compound 3 can migrate from one leaflet to other. The mechanism of this process is, however, different from that characteristic of the flip-flop event of lipid molecules in the membrane. Finally, the possible application of compound 3 as a rotational molecular probe for monitoring fluidity of liposomal membrane in the acyl side chain region was checked by studies of the effect of cholesterol on the fluorescence anisotropy of 3.
Collapse
Affiliation(s)
- Mariusz Kepczynski
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland.
| | | | | | | | | | | | | | | |
Collapse
|
21
|
Oreopoulos J, Yip CM. Probing membrane order and topography in supported lipid bilayers by combined polarized total internal reflection fluorescence-atomic force microscopy. Biophys J 2009; 96:1970-84. [PMID: 19254557 DOI: 10.1016/j.bpj.2008.11.041] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Accepted: 11/17/2008] [Indexed: 11/19/2022] Open
Abstract
Determining the local structure, dynamics, and conformational requirements for protein-protein and protein-lipid interactions in membranes is critical to understanding biological processes ranging from signaling to the translocating and membranolytic action of antimicrobial peptides. We report here the application of a combined polarized total internal reflection fluorescence microscopy-in situ atomic force microscopy platform. This platform's ability to image membrane orientational order was demonstrated on DOPC/DSPC/cholesterol model membranes containing the fluorescent membrane probe, DiI-C(20) or BODIPY-PC. Spatially resolved order parameters and fluorophore tilt angles extracted from the polarized total internal reflection fluorescence microscopy images were in good agreement with the topographical details resolved by in situ atomic force microscopy, portending use of this technique for high-resolution characterization of membrane domain structures and peptide-membrane interactions.
Collapse
Affiliation(s)
- John Oreopoulos
- Institute of Biomaterials and Biomedical Engineering, Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Canada
| | | |
Collapse
|
22
|
Pajk S, Pečar S. Synthesis of novel amphiphilic spin probes with the paramagnetic doxyl group in the polar region. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.11.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
23
|
Ordering effects of cholesterol and its analogues. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:97-121. [DOI: 10.1016/j.bbamem.2008.08.022] [Citation(s) in RCA: 450] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2008] [Revised: 08/27/2008] [Accepted: 08/31/2008] [Indexed: 12/12/2022]
|
24
|
Vartorelli MR, Garay AS, Rodrigues DE. Spin-labeled Stearic Acid Behavior and Perturbations on the Structure of a Gel-Phase-Lipid Bilayer in Water: 5-, 12- and 16-SASL. J Phys Chem B 2008; 112:16830-42. [DOI: 10.1021/jp806476a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Martín R. Vartorelli
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and INTEC (UNL-CONICET), C.C. 242, Ciudad Universitaria, C.P. S3000ZAA, Santa Fe, Argentina
| | - Alberto S. Garay
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and INTEC (UNL-CONICET), C.C. 242, Ciudad Universitaria, C.P. S3000ZAA, Santa Fe, Argentina
| | - Daniel E. Rodrigues
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and INTEC (UNL-CONICET), C.C. 242, Ciudad Universitaria, C.P. S3000ZAA, Santa Fe, Argentina
| |
Collapse
|
25
|
Isaev NP, Dzuba SA. Fast Stochastic Librations and Slow Rotations of Spin Labeled Stearic Acids in a Model Phospholipid Bilayer at Cryogenic Temperatures. J Phys Chem B 2008; 112:13285-91. [DOI: 10.1021/jp805794c] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Nikolay P. Isaev
- Institute of Chemical Kinetics and Combustion, Institutskaya-3, 630090 Novosibirsk, Russia, and Novosibirsk State University, 630090, Pirogova-2, Novosibirsk, Russia
| | - Sergei A. Dzuba
- Institute of Chemical Kinetics and Combustion, Institutskaya-3, 630090 Novosibirsk, Russia, and Novosibirsk State University, 630090, Pirogova-2, Novosibirsk, Russia
| |
Collapse
|