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Nguyen TTT, Haam S, Park JS, Lee SW. Cysteine-Encapsulated Liposome for Investigating Biomolecular Interactions at Lipid Membranes. Int J Mol Sci 2022; 23:ijms231810566. [PMID: 36142476 PMCID: PMC9500635 DOI: 10.3390/ijms231810566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/05/2022] [Accepted: 09/07/2022] [Indexed: 11/29/2022] Open
Abstract
The development of a strategy to investigate interfacial phenomena at lipid membranes is practically useful because most essential biomolecular interactions occur at cell membranes. In this study, a colorimetric method based on cysteine-encapsulated liposomes was examined using gold nanoparticles as a probe to provide a platform to report an enzymatic activity at lipid membranes. The cysteine-encapsulated liposomes were prepared with varying ratios of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and cholesterol through the hydration of lipid films and extrusions in the presence of cysteine. The size, composition, and stability of resulting liposomes were analyzed by scanning electron microscopy (SEM), dynamic light scattering (DLS), nuclear magnetic resonance (NMR) spectroscopy, and UV-vis spectrophotometry. The results showed that the increased cholesterol content improved the stability of liposomes, and the liposomes were formulated with 60 mol % cholesterol for the subsequent experiments. Triton X-100 was tested to disrupt the lipid membranes to release the encapsulated cysteine from the liposomes. Cysteine can induce the aggregation of gold nanoparticles accompanying a color change, and the colorimetric response of gold nanoparticles to the released cysteine was investigated in various media. Except in buffer solutions at around pH 5, the cysteine-encapsulated liposomes showed the color change of gold nanoparticles only after being incubated with Triton X-100. Finally, the cysteine-encapsulated liposomal platform was tested to report the enzymatic activity of phospholipase A2 that hydrolyzes phospholipids in the membrane. The hydrolysis of phospholipids triggered the release of cysteine from the liposomes, and the released cysteine was successfully detected by monitoring the distinct red-to-blue color change of gold nanoparticles. The presence of phospholipase A2 was also confirmed by the appearance of a peak around 690 nm in the UV-vis spectra, which is caused by the cysteine-induced aggregation of gold nanoparticles. The results demonstrated that the cysteine-encapsulated liposome has the potential to be used to investigate biological interactions occurring at lipid membranes.
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Affiliation(s)
- Trang Thi Thuy Nguyen
- Department of Chemical and Biological Engineering, Gachon University, Seongnam-si 13120, Korea
| | - Seungjoo Haam
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Korea
| | - Joon-Seo Park
- Department of Chemistry, Eastern University, St. Davids, PA 19087, USA
- Correspondence: (J.-S.P.); (S.-W.L.)
| | - Sang-Wha Lee
- Department of Chemical and Biological Engineering, Gachon University, Seongnam-si 13120, Korea
- Correspondence: (J.-S.P.); (S.-W.L.)
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2
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Konstantinidi A, Chountoulesi M, Naziris N, Sartori B, Amenitsch H, Mali G, Čendak T, Plakantonaki M, Triantafyllakou I, Tselios T, Demetzos C, Busath DD, Mavromoustakos T, Kolocouris A. The boundary lipid around DMPC-spanning influenza A M2 transmembrane domain channels: Its structure and potential for drug accommodation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1862:183156. [PMID: 31846647 DOI: 10.1016/j.bbamem.2019.183156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 12/11/2019] [Accepted: 12/12/2019] [Indexed: 10/25/2022]
Abstract
We have investigated the perturbation of influenza A M2TM in DMPC bilayers. We have shown that (a) DSC and SAXS detect changes in membrane organization caused by small changes (micromolar) in M2TM or aminoadamantane concentration and aminoadamantane structure, by comparison of amantadine and spiro[pyrrolidine-2,2'-adamantane] (AK13), (b) that WAXS and MD can suggest details of ligand topology. DSC and SAXS show that at a low M2TM micromolar concentration in DPMC bilayers, two lipid domains are observed, which likely correspond to M2TM boundary lipids and bulk-like lipids. At higher M2TM concentrations, one domain only is identified, which constitutes essentially all of the lipid molecules behaving as boundary lipids. According to SAXS, WAXS, and DSC in the absence of M2TM, both aminoadamantane drugs exert a similar perturbing effect on the bilayer at low concentrations. At the same concentrations of the drug when M2TM is present, amantadine and, to a lesser extent, AK13 cause, according to WAXS, a significant disordering of chain-stacking, which also leads to the formation of two lipid domains. This effect is likely due, according to MD simulations, to the preference of the more lipophilic AK13 to locate closer to the lateral surfaces of M2TM when compared to amantadine, which forms stronger ionic interactions with phosphate groups. The preference of AK13 to concentrate inside the lipid bilayer close to the exterior of the hydrophobic M2TM helices may contribute to its higher binding affinity compared to amantadine.
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Affiliation(s)
- Athina Konstantinidi
- Section of Pharmaceutical Chemistry, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - Maria Chountoulesi
- Section of Pharmaceutical Technology, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - Nikolaos Naziris
- Section of Pharmaceutical Technology, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - Barbara Sartori
- Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9/IV, A-8010 Graz, Austria
| | - Heinz Amenitsch
- Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9/IV, A-8010 Graz, Austria
| | - Gregor Mali
- Department of Inorganic Chemistry and Technology, National Institute of Chemistry, Ljubljana SI-1001, Slovenia
| | - Tomaž Čendak
- Department of Inorganic Chemistry and Technology, National Institute of Chemistry, Ljubljana SI-1001, Slovenia
| | - Maria Plakantonaki
- Department of Chemistry, School of Natural Sciences, University of Patras, Rion, Patras 26500, Greece
| | - Iro Triantafyllakou
- Department of Chemistry, School of Natural Sciences, University of Patras, Rion, Patras 26500, Greece
| | - Theodore Tselios
- Department of Chemistry, School of Natural Sciences, University of Patras, Rion, Patras 26500, Greece
| | - Costas Demetzos
- Section of Pharmaceutical Technology, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - David D Busath
- Department of Physiology and Developmental Biology, Brigham Young University, Provo, UT 84602, USA
| | - Thomas Mavromoustakos
- Section of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Athens 15771, Greece.
| | - Antonios Kolocouris
- Section of Pharmaceutical Chemistry, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens 15771, Greece.
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3
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Hasan M, Patel D, Ellis N, Brown SP, Lewandowski JR, Dixon AM. Modulation of Transmembrane Domain Interactions in Neu Receptor Tyrosine Kinase by Membrane Fluidity and Cholesterol. J Membr Biol 2019; 252:357-369. [DOI: 10.1007/s00232-019-00075-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 06/09/2019] [Indexed: 01/06/2023]
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4
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Konstantinidi A, Naziris N, Chountoulesi M, Kiriakidi S, Sartori B, Kolokouris D, Amentisch H, Mali G, Ntountaniotis D, Demetzos C, Mavromoustakos T, Kolocouris A. Comparative Perturbation Effects Exerted by the Influenza A M2 WT Protein Inhibitors Amantadine and the Spiro[pyrrolidine-2,2'-adamantane] Variant AK13 to Membrane Bilayers Studied Using Biophysical Experiments and Molecular Dynamics Simulations. J Phys Chem B 2018; 122:9877-9895. [PMID: 30285441 DOI: 10.1021/acs.jpcb.8b07071] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Aminoadamantane drugs are lipophilic amines that block the membrane-embedded influenza A M2 WT (wild type) ion channel protein. The comparative effects of amantadine ( Amt) and its synthetic spiro[pyrrolidine-2,2'-adamantane] (AK13) analogue in dimyristoylphosphatidylcholine (DMPC) bilayers were studied using a combination of experimental biophysical methods, differential scanning calorimetry (DSC), X-ray diffraction, solid-state NMR (ssNMR) spectroscopy, and molecular dynamics (MD) simulations. All three experimental methods pointed out that the two analogues perturbed drastically the DMPC bilayers with AK13 to be more effective at high concentrations. AK13 was tolerated in lipid bilayers at very high concentrations, while Amt was crystallized. This is an important consideration in the formulations of drugs as it designates a limitation of Amt incorporation. MD simulations verify provided details about the strong interactions of the drugs in the interface region between phosphoglycerol backbone and lipophilic segments. The two drugs form hydrogen bonding with both water and sn-2 carbonyls in their amine form or water and phosphate oxygens in their ammonium form. Such localization of the drugs explains the DMPC bilayers reorientation and their strong perturbing effect evidenced by all biophysical methodologies applied.
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Affiliation(s)
| | | | | | | | - Barbara Sartori
- Institute of Inorganic Chemistry , Graz University of Technology , Stremayrgasse 9/5 , A-8010 Graz , Austria
| | | | - Heinz Amentisch
- Institute of Inorganic Chemistry , Graz University of Technology , Stremayrgasse 9/5 , A-8010 Graz , Austria
| | - Gregor Mali
- Department of Inorganic Chemistry and Technology , National Institute of Chemistry , Ljubljana SI-1001 , Slovenia
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5
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Craig AF, Clark EE, Sahu ID, Zhang R, Frantz ND, Al-Abdul-Wahid MS, Dabney-Smith C, Konkolewicz D, Lorigan GA. Tuning the size of styrene-maleic acid copolymer-lipid nanoparticles (SMALPs) using RAFT polymerization for biophysical studies. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2931-2939. [PMID: 27539205 DOI: 10.1016/j.bbamem.2016.08.004] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 07/15/2016] [Accepted: 08/07/2016] [Indexed: 11/29/2022]
Abstract
Characterization of membrane proteins is challenging due to the difficulty in mimicking the native lipid bilayer with properly folded and functional membrane proteins. Recently, styrene-maleic acid (StMA) copolymers have been shown to facilitate the formation of disc-like lipid bilayer mimetics that maintain the structural and dynamic integrity of membrane proteins. Here we report the controlled synthesis and characterization of StMA containing block copolymers. StMA polymers with different compositions and molecular weights were synthesized and characterized by size exclusion chromatography (SEC). These polymers act as macromolecular surfactants for 1-Palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC)/1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol (POPG) lipids, forming disc like structures of the lipids with the polymer wrapping around the hydrophobic lipid edge. A combination of dynamic light scattering (DLS), solid-state nuclear magnetic resonance (SSNMR) spectroscopy, and transmission electron microscopy (TEM) was used to characterize the size of the nanoparticles created using these StMA polymers. At a weight ratio of 1.25:1 StMA to lipid, the nanoparticle size created is 28+1nm for a 2:1 ratio, 10+1nm for a 3:1 StMA ratio and 32+1nm for a 4:1 StMA ratio independent of the molecular weight of the polymer. Due to the polymer acting as a surfactant that forms disc like nanoparticles, we term these StMA based block copolymers "RAFT SMALPs". RAFT SMALPs show promise as a new membrane mimetic with different nanoscale sizes, which can be used for a wide variety of biophysical studies of membrane proteins.
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Affiliation(s)
- Andrew F Craig
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - Emily E Clark
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - Indra D Sahu
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - Rongfu Zhang
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - Nick D Frantz
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - M Sameer Al-Abdul-Wahid
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - Carole Dabney-Smith
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - Dominik Konkolewicz
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States
| | - Gary A Lorigan
- Department of Chemistry and Biochemistry, Miami University, 651 E. High Street, Oxford, OH 45056, United States.
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6
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Probing the gel to liquid-crystalline phase transition and relevant conformation changes in liposomes by (13)C magic-angle spinning NMR spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:3134-9. [PMID: 26375416 DOI: 10.1016/j.bbamem.2015.09.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 09/04/2015] [Accepted: 09/10/2015] [Indexed: 11/24/2022]
Abstract
A straightforward way to visualize gel to liquid-crystalline phase transition in phospholipid membranes is presented by using ¹³C magic-angle spinning NMR. The changes in the 13C isotropic chemical shifts with increasing temperature are shown to be a sensitive probe of the main thermotropic phase transition related to lipid hydrocarbon chain dynamics and relevant conformational changes. The average value of the energy difference between trans and gauche states in the central C4–11 fragment of the DMPC acyl chain was estimated to be 4.02 ± 0.2 kJ mol⁻¹ in the liquid crystalline phase. The reported spectral features will be useful in 13C solid state NMR studies for direct monitoring of the effective lipid chain melting allowing rapid uniaxial rotation of membrane proteins in the biologically relevant liquid-crystalline phase.
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7
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Lindholm L, Ariöz C, Jawurek M, Liebau J, Mäler L, Wieslander Å, von Ballmoos C, Barth A. Effect of lipid bilayer properties on the photocycle of green proteorhodopsin. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1847:698-708. [DOI: 10.1016/j.bbabio.2015.04.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 04/17/2015] [Accepted: 04/21/2015] [Indexed: 01/20/2023]
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8
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Nierzwicki L, Wieczor M, Censi V, Baginski M, Calucci L, Samaritani S, Czub J, Forte C. Interaction of cisplatin and two potential antitumoral platinum(ii) complexes with a model lipid membrane: a combined NMR and MD study. Phys Chem Chem Phys 2015; 17:1458-68. [DOI: 10.1039/c4cp04360j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Multinuclear NMR and MD calculations highlighted the different interactions of cisplatin and two potential antitumoral Pt(ii) complexes with a model membrane.
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Affiliation(s)
- L. Nierzwicki
- Department of Physical Chemistry
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - M. Wieczor
- Department of Physical Chemistry
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - V. Censi
- Department of Chemistry and Industrial Chemistry
- University of Pisa
- 56126 Pisa
- Italy
| | - M. Baginski
- Department of Pharmaceutical Technology and Biochemistry
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - L. Calucci
- Institute of the Chemistry of Organometallic Compounds
- CNR
- 56124 Pisa
- Italy
| | - S. Samaritani
- Department of Chemistry and Industrial Chemistry
- University of Pisa
- 56126 Pisa
- Italy
| | - J. Czub
- Department of Physical Chemistry
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - C. Forte
- Institute of the Chemistry of Organometallic Compounds
- CNR
- 56124 Pisa
- Italy
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9
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Lee M, Hong M. Cryoprotection of lipid membranes for high-resolution solid-state NMR studies of membrane peptides and proteins at low temperature. JOURNAL OF BIOMOLECULAR NMR 2014; 59:263-77. [PMID: 25015530 PMCID: PMC4160392 DOI: 10.1007/s10858-014-9845-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 07/03/2014] [Indexed: 05/09/2023]
Abstract
Solid-state NMR spectra of membrane proteins often show significant line broadening at cryogenic temperatures. Here we investigate the effects of several cryoprotectants to preserve the spectral resolution of lipid membranes and membrane peptides at temperatures down to ~200 K. Trehalose, glycerol, dimethylsulfoxide (DMSO), dimethylformamide (DMF), and polyethylene glycol (PEG), were chosen. These compounds are commonly used in protein crystallography and cryobiology. 13C and 1H magic-angle-spinning spectra of several types of lipid membranes show that DMSO provides the best resolution enhancement over unprotected membranes and also best retards ice formation at low temperature. DMF and PEG-400 show slightly weaker cryoprotection, while glycerol and trehalose neither prevent membrane line broadening nor prevent ice formation under the conditions of our study. Neutral saturated-chain phospholipids are the most amenable to cryoprotection, whereas negatively charged and unsaturated lipids attenuate cryoprotection. 13C-1H dipolar couplings and 31P chemical shift anisotropies indicate that high spectral resolution at low temperature is correlated with stronger immobilization of the lipids at high temperature, indicating that line narrowing results from reduction of the conformational space sampled by the lipid molecules at high temperature. DMSO selectively narrowed the linewidths of the most disordered residues in the influenza M2 transmembrane peptide, while residues that exhibit narrow linewidths in the unprotected membrane are less impacted. A relatively rigid β-hairpin antimicrobial peptide, PG-1, showed a linewidth increase of ~0.5 ppm over a ~70 K temperature drop both with and without cryoprotection. Finally, a short-chain saturated lipid, DLPE, exhibits excellent linewidths, suggesting that it may be a good medium for membrane protein structure determination. The three best cryoprotectants found in this work-DMSO, PEG, and DMF-should be useful for low-temperature membrane-protein structural studies by SSNMR without compromising spectral resolution.
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Affiliation(s)
| | - Mei Hong
- Corresponding author: Mei Hong, Tel: 515-294-3521, Fax: 515-294-0105,
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10
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Alsop RJ, Barrett MA, Zheng S, Dies H, Rheinstädter MC. Acetylsalicylic acid (ASA) increases the solubility of cholesterol when incorporated in lipid membranes. SOFT MATTER 2014; 10:4275-4286. [PMID: 24789086 DOI: 10.1039/c4sm00372a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Cholesterol has been well established as a mediator of cell membrane fluidity. By interacting with lipid tails, cholesterol causes the membrane tails to be constrained thereby reducing membrane fluidity, well known as the condensation effect. Acetylsalicylic acid (ASA), the main ingredient in aspirin, has recently been shown to increase fluidity in lipid bilayers by primarily interacting with lipid head groups. We used high-resolution X-ray diffraction to study both ASA and cholesterol coexisting in model membranes of dimyristoylphosphatidylcholine (DMPC). While a high cholesterol concentration of 40 mol% cholesterol leads to the formation of immiscible cholesterol bilayers, as was reported previously, increasing the amount of ASA in the membranes between 0 to 12.5 mol% was found to significantly increase the fluidity of the bilayers and dissolve the cholesterol plaques. We, therefore, present experimental evidence for an interaction between cholesterol and ASA on the level of the cell membrane at elevated levels of cholesterol and ASA.
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Affiliation(s)
- Richard J Alsop
- Department of Physics and Astronomy, McMaster University, Hamilton, ON, Canada
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11
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Dutagaci B, Becker-Baldus J, Faraldo-Gómez JD, Glaubitz C. Ceramide-lipid interactions studied by MD simulations and solid-state NMR. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2511-9. [PMID: 24882733 DOI: 10.1016/j.bbamem.2014.05.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 05/20/2014] [Accepted: 05/21/2014] [Indexed: 01/08/2023]
Abstract
Ceramides play a key modulatory role in many cellular processes, which results from their effect on the structure and dynamics of biological membranes. In this study, we investigate the influence of C16-ceramide (C16) on the biophysical properties of DMPC lipid bilayers using solid-state NMR and atomistic molecular dynamics (MD) simulations. MD simulations and NMR measurements were carried out for a pure DMPC bilayer and for a 20% DMPC-C16 mixture. Calculated key structural properties, namely area per lipid, chain order parameters, and mass density profiles, indicate that C16 has an ordering effect on the DMPC bilayer. Furthermore, the simulations predict that specific hydrogen-bonds form between DMPC and C16 molecules. Multi-nuclear solid-state NMR was used to verify these theoretical predictions. Chain order parameters extracted from (13)C(1)H dipole couplings were measured for both lipid and ceramide and follow the trend suggested by the MD simulations. Furthermore, (1)H-MAS NMR experiments showed a direct contact between ceramide and lipids.
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Affiliation(s)
- Bercem Dutagaci
- Institute of Biophysical Chemistry, J.W. Goethe-University, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Johanna Becker-Baldus
- Institute of Biophysical Chemistry, J.W. Goethe-University, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - José D Faraldo-Gómez
- Theoretical Molecular Biophysics Section, National Heart, Lung & Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry, J.W. Goethe-University, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany.
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12
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Sierant M, Paluch P, Florczak M, Rozanski A, Miksa B. Photosensitive nanocapsules for use in imaging from poly(styrene-co-divinylbenzene) cross-linked with coumarin derivatives. Colloids Surf B Biointerfaces 2013; 111:571-8. [DOI: 10.1016/j.colsurfb.2013.07.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 06/29/2013] [Accepted: 07/01/2013] [Indexed: 12/23/2022]
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13
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Toppozini L, Dies H, Deamer DW, Rheinstädter MC. Adenosine monophosphate forms ordered arrays in multilamellar lipid matrices: insights into assembly of nucleic acid for primitive life. PLoS One 2013; 8:e62810. [PMID: 23667523 PMCID: PMC3646914 DOI: 10.1371/journal.pone.0062810] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 03/26/2013] [Indexed: 11/18/2022] Open
Abstract
A fundamental question of biology is how nucleic acids first assembled and then were incorporated into the earliest forms of cellular life 4 billion years ago. The polymerization of nucleotides is a condensation reaction in which phosphodiester bonds are formed. This reaction cannot occur in aqueous solutions, but guided polymerization in an anhydrous lipid environment could promote a non-enzymatic condensation reaction in which oligomers of single stranded nucleic acids are synthesized. We used X-ray scattering to investigate 5′-adenosine monophosphate (AMP) molecules captured in a multilamellar phospholipid matrix composed of dimyristoylphosphatidylcholine. Bragg peaks corresponding to the lateral organization of the confined AMP molecules were observed. Instead of forming a random array, the AMP molecules are highly entangled, with the phosphate and ribose groups in close proximity. This structure may facilitate polymerization of the nucleotides into RNA-like polymers.
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Affiliation(s)
- Laura Toppozini
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
- Origins Institute, McMaster University, Hamilton, Ontario, Canada
- * E-mail: (LT); (DWD); (MCR))
| | - Hannah Dies
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - David W. Deamer
- Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, California, United States of America
- * E-mail: (LT); (DWD); (MCR))
| | - Maikel C. Rheinstädter
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
- Origins Institute, McMaster University, Hamilton, Ontario, Canada
- Canadian Neutron Beam Centre, National Research Council Canada, Chalk River Laboratories, Chalk River, Ontario, Canada
- * E-mail: (LT); (DWD); (MCR))
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14
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Barrett MA, Zheng S, Roshankar G, Alsop RJ, Belanger RKR, Huynh C, Kučerka N, Rheinstädter MC. Interaction of aspirin (acetylsalicylic acid) with lipid membranes. PLoS One 2012; 7:e34357. [PMID: 22529913 PMCID: PMC3328472 DOI: 10.1371/journal.pone.0034357] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Accepted: 03/01/2012] [Indexed: 11/18/2022] Open
Abstract
We studied the interaction of Aspirin (acetylsalicylic acid) with lipid membranes using x-ray diffraction for bilayers containing up to 50 mol% of aspirin. From 2D x-ray intensity maps that cover large areas of reciprocal space we determined the position of the ASA molecules in the phospholipid bilayers and the molecular arrangement of the molecules in the plane of the membranes. We present direct experimental evidence that ASA molecules participate in saturated lipid bilayers of DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine) and preferably reside in the head group region of the membrane. Up to 50 mol% ASA molecules can be dissolved in this type of bilayer before the lateral membrane organization is disturbed and the membranes are found to form an ordered, 2D crystal-like structure. Furthermore, ASA and cholesterol were found to co-exist in saturated lipid bilayers, with the ASA molecules residing in the head group region and the cholesterol molecules participating in the hydrophobic membrane core.
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Affiliation(s)
- Matthew A. Barrett
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - Songbo Zheng
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - Golnaz Roshankar
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - Richard J. Alsop
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - Randy K. R. Belanger
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - Chris Huynh
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - Norbert Kučerka
- Canadian Neutron Beam Centre, National Research Council Canada, Chalk River, Ontario, Canada
| | - Maikel C. Rheinstädter
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
- Canadian Neutron Beam Centre, National Research Council Canada, Chalk River, Ontario, Canada
- * E-mail:
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