1
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Andrilli LHS, Sebinelli HG, Cominal JG, Bolean M, Hayann L, Millán JL, Ramos AP, Ciancaglini P. Differential effects of the lipidic and ionic microenvironment on NPP1's phosphohydrolase and phosphodiesterase activities. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2024; 1866:184292. [PMID: 38342362 DOI: 10.1016/j.bbamem.2024.184292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 12/30/2023] [Accepted: 01/31/2024] [Indexed: 02/13/2024]
Abstract
Ecto-nucleotide pyrophosphatase/phosphodiesterase 1 (NPP1) is an enzyme present in matrix vesicles (MV). NPP1 participates on the regulation of bone formation by producing pyrophosphate (PPi) from adenosine triphosphate (ATP). Here, we have used liposomes bearing dipalmitoylphosphatidylcholine (DPPC), sphingomyelin (SM), and cholesterol (Chol) harboring NPP1 to mimic the composition of MV lipid rafts to investigate ionic and lipidic influence on NPP1 activity and mineral propagation. Atomic force microscopy (AFM) revealed that DPPC-liposomes had spherical and smooth surface. The presence of SM and Chol elicited rough and smooth surface, respectively. NPP1 insertion produced protrusions in all the liposome surface. Maximum phosphodiesterase activity emerged at 0.082 M ionic strength, whereas maximum phosphomonohydrolase activity arose at low ionic strength. Phosphoserine-Calcium Phosphate Complex (PS-CPLX) and amorphous calcium-phosphate (ACP) induced mineral propagation in DPPC- and DPPC:SM-liposomes and in DPPC:Chol-liposomes, respectively. Mineral characterization revealed the presence of bands assigned to HAp in the mineral propagated by NPP1 harbored in DPPC-liposomes without nucleators or in DPPC:Chol-liposomes with ACP nucleators. These data show that studying how the ionic and lipidic environment affects NPP1 properties is important, especially for HAp obtained under controlled conditions in vitro.
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Affiliation(s)
- Luiz H S Andrilli
- Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto, SP, Brazil; Sanford Children's Health Research Center, Sanford Burnham Prebys, La Jolla, CA, USA
| | - Heitor G Sebinelli
- Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Juçara G Cominal
- Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Maytê Bolean
- Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Larwsk Hayann
- Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - José Luís Millán
- Sanford Children's Health Research Center, Sanford Burnham Prebys, La Jolla, CA, USA
| | - Ana P Ramos
- Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto, SP, Brazil.
| | - Pietro Ciancaglini
- Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto, SP, Brazil.
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2
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Maleš P, Pem B, Petrov D, Jurašin DD, Bakarić D. Deciphering the origin of the melting profile of unilamellar phosphatidylcholine liposomes by measuring the turbidity of its suspensions. SOFT MATTER 2022; 18:6703-6715. [PMID: 36017811 DOI: 10.1039/d2sm00878e] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The elucidation of the thermal properties of phosphatidylcholine liposomes is often based on the analysis of the thermal capacity profiles of multilamellar liposomes (MLV), which may qualitatively disagree with those of unilamellar liposomes (LUV). Experiments and interpretation of LUV liposomes is further complicated by aggregation and lamellarization of lipid bilayers in a short time period, which makes it almost impossible to distinguish the signatures of the two types of bilayers. To characterize independently MLV and LUV of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), the latter were prepared with the addition of small amounts of 1,2-dipalmitoyl-sn-glycero-3-phosphatidylglycerol (DPPG) which, due to the sterical hindrance and negative charge at a given pH value, cause LUV repellence and contribute to their stability. Differential scanning calorimetry curves and temperature-dependent UV/Vis spectra of the prepared MLV and LUV were measured. Multivariate analysis of spectrophotometric data determined the phase transition temperatures (pretransition at Tp and the main phase transition at Tm), and based on the changes in turbidities, the thickness of the lipid bilayer in LUV was determined. The obtained data suggested that the curvature change is a key distinguishing factor in MLV and LUV heat capacity profiles. By combining the experimental results and those obtained by MD simulations, the interfacial water layer was characterized and its contribution to the thermal properties of LUV was discussed.
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Affiliation(s)
- Petra Maleš
- Division for Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia.
| | - Barbara Pem
- Division for Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia.
| | - Dražen Petrov
- Institute of Molecular Modeling and Simulation, University of Natural Resources and Life Sciences, 1180 Vienna, Austria
| | - Darija Domazet Jurašin
- Division for Physical Chemistry, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Danijela Bakarić
- Division for Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia.
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3
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Shafaa MW, Hassan ESE, Faraag AHI, Essawy E, Abdelfattah MS. Fabrication and characterization of pigmented secondary metabolites bound liposomes with improved cytotoxic activity against prostate and hepatic cancer. INTERNATIONAL NANO LETTERS 2022. [DOI: 10.1007/s40089-022-00375-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Mahrous GR, Elkholy NS, Safwat G, Shafaa MW. Enhanced cytotoxic activity of beta carotene conjugated liposomes towards breast cancer cell line: comparative studies with cyclophosphamide. Anticancer Drugs 2022; 33:e462-e476. [PMID: 34726638 DOI: 10.1097/cad.0000000000001245] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This work aims to evaluate cyclophosphamide (Cyclo) cytotoxic efficacy combined with liposomes in the presence or absence of beta carotene (beta) by detecting the effects of these compounds on the breast cancer cell line (MCF-7) DNA damage. The IC50 value for beta in cytotoxic assay with MCF-7 treated cells was 21.15 μg/ml, while with liposomal beta (LipoBeta) being 121 μg/ml. The free Cyclo IC50 value was 719.86 μg/ml, its liposomal form (LipoCyclo) was 172 μg/ml. The results indicated that in contrast with Cyclo and control values, all comet assay parameters for the LipoBeta were significantly increased (P < 0.05). In MCF-7 cells treated with beta, the findings show a higher intensity of comet tail than those treated with LipoBeta. The presence of several double-strand breaks suggests this high intensity relative to the head. The molecular combination between Cyclo and liposomes in the presence or absence of beta was characterized. Dynamic light scattering measurements confirmed the mono-dispersity of all samples. The incorporation of Cyclo or beta into liposomes exhibited a slight shift to higher temperature compared to the main peak of empty liposomes that exists at 101.5°C which creates a conformational disorder within the phospholipids. The FTIR study showed structural alterations in vesicles after liposome encapsulation.
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Affiliation(s)
- Gina R Mahrous
- Faculty of Biotechnology, October University for Modern Science and Arts, Cairo, Egypt
| | - Nourhan S Elkholy
- Medical Biophysics Division, Physics Department, Faculty of Science, Helwan University, Cairo, Egypt
| | - Gehan Safwat
- Faculty of Biotechnology, October University for Modern Science and Arts, Cairo, Egypt
| | - Medhat W Shafaa
- Medical Biophysics Division, Physics Department, Faculty of Science, Helwan University, Cairo, Egypt
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5
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Munusamy S, Conde R, Bertrand B, Munoz-Garay C. Biophysical approaches for exploring lipopeptide-lipid interactions. Biochimie 2020; 170:173-202. [PMID: 31978418 PMCID: PMC7116911 DOI: 10.1016/j.biochi.2020.01.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 01/19/2020] [Indexed: 02/07/2023]
Abstract
In recent years, lipopeptides (LPs) have attracted a lot of attention in the pharmaceutical industry due to their broad-spectrum of antimicrobial activity against a variety of pathogens and their unique mode of action. This class of compounds has enormous potential for application as an alternative to conventional antibiotics and for pest control. Understanding how LPs work from a structural and biophysical standpoint through investigating their interaction with cell membranes is crucial for the rational design of these biomolecules. Various analytical techniques have been developed for studying intramolecular interactions with high resolution. However, these tools have been barely exploited in lipopeptide-lipid interactions studies. These biophysical approaches would give precise insight on these interactions. Here, we reviewed these state-of-the-art analytical techniques. Knowledge at this level is indispensable for understanding LPs activity and particularly their potential specificity, which is relevant information for safe application. Additionally, the principle of each analytical technique is presented and the information acquired is discussed. The key challenges, such as the selection of the membrane model are also been briefly reviewed.
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Affiliation(s)
- Sathishkumar Munusamy
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, 62210, Cuernavaca, Mexico
| | - Renaud Conde
- Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, Mexico
| | - Brandt Bertrand
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, 62210, Cuernavaca, Mexico
| | - Carlos Munoz-Garay
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, 62210, Cuernavaca, Mexico.
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6
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Wu HL, Sheng YJ, Tsao HK. Phase behaviors and membrane properties of model liposomes: Temperature effect. J Chem Phys 2014; 141:124906. [DOI: 10.1063/1.4896382] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Affiliation(s)
- Hsing-Lun Wu
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
| | - Yu-Jane Sheng
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
| | - Heng-Kwong Tsao
- Department of Chemical and Materials Engineering, Department of Physics, National Central University, Jhongli 320, Taiwan
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7
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Structure of solid-supported lipid membrane probed by noble metal nanoparticle deposition. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:2884-91. [DOI: 10.1016/j.bbamem.2012.07.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 07/04/2012] [Accepted: 07/11/2012] [Indexed: 11/20/2022]
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8
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Cardoso AM, Trabulo S, Cardoso AL, Lorents A, Morais CM, Gomes P, Nunes C, Lúcio M, Reis S, Padari K, Pooga M, Pedroso de Lima MC, Jurado AS. S4(13)-PV cell-penetrating peptide induces physical and morphological changes in membrane-mimetic lipid systems and cell membranes: Implications for cell internalization. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:877-88. [DOI: 10.1016/j.bbamem.2011.12.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 12/05/2011] [Accepted: 12/21/2011] [Indexed: 01/09/2023]
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9
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Eriksson SK, Kutzer M, Procek J, Gröbner G, Harryson P. Tunable membrane binding of the intrinsically disordered dehydrin Lti30, a cold-induced plant stress protein. THE PLANT CELL 2011; 23:2391-404. [PMID: 21665998 PMCID: PMC3160030 DOI: 10.1105/tpc.111.085183] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Dehydrins are intrinsically disordered plant proteins whose expression is upregulated under conditions of desiccation and cold stress. Their molecular function in ensuring plant survival is not yet known, but several studies suggest their involvement in membrane stabilization. The dehydrins are characterized by a broad repertoire of conserved and repetitive sequences, out of which the archetypical K-segment has been implicated in membrane binding. To elucidate the molecular mechanism of these K-segments, we examined the interaction between lipid membranes and a dehydrin with a basic functional sequence composition: Lti30, comprising only K-segments. Our results show that Lti30 interacts electrostatically with vesicles of both zwitterionic (phosphatidyl choline) and negatively charged phospholipids (phosphatidyl glycerol, phosphatidyl serine, and phosphatidic acid) with a stronger binding to membranes with high negative surface potential. The membrane interaction lowers the temperature of the main lipid phase transition, consistent with Lti30's proposed role in cold tolerance. Moreover, the membrane binding promotes the assembly of lipid vesicles into large and easily distinguishable aggregates. Using these aggregates as binding markers, we identify three factors that regulate the lipid interaction of Lti30 in vitro: (1) a pH dependent His on/off switch, (2) phosphorylation by protein kinase C, and (3) reversal of membrane binding by proteolytic digest.
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Affiliation(s)
- Sylvia K. Eriksson
- Department of Biochemistry and Biophysics, Arrhenius Laboratories for Natural Sciences, Stockholm University, 106 91 Stockholm, Sweden
| | - Michael Kutzer
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umea, Sweden
| | - Jan Procek
- Department of Biophysical Chemistry, Umeå University, 90187 Umea, Sweden
| | - Gerhard Gröbner
- Department of Biophysical Chemistry, Umeå University, 90187 Umea, Sweden
| | - Pia Harryson
- Department of Biochemistry and Biophysics, Arrhenius Laboratories for Natural Sciences, Stockholm University, 106 91 Stockholm, Sweden
- Address correspondence to
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10
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Yokoyama Y, Negishi L, Kitoh T, Sonoyama M, Asami Y, Mitaku S. Effect of Lipid Phase Transition on Molecular Assembly and Structural Stability of Bacteriorhodopsin Reconstituted into Phosphatidylcholine Liposomes with Different Acyl-Chain Lengths. J Phys Chem B 2010; 114:15706-11. [DOI: 10.1021/jp108034n] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yasunori Yokoyama
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603 Japan, and TA Instruments Japan, Inc., Tokyo, 141-0031 Japan
| | - Lumi Negishi
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603 Japan, and TA Instruments Japan, Inc., Tokyo, 141-0031 Japan
| | - Taku Kitoh
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603 Japan, and TA Instruments Japan, Inc., Tokyo, 141-0031 Japan
| | - Masashi Sonoyama
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603 Japan, and TA Instruments Japan, Inc., Tokyo, 141-0031 Japan
| | - Yasuo Asami
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603 Japan, and TA Instruments Japan, Inc., Tokyo, 141-0031 Japan
| | - Shigeki Mitaku
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603 Japan, and TA Instruments Japan, Inc., Tokyo, 141-0031 Japan
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11
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El Kirat K, Morandat S, Dufrêne YF. Nanoscale analysis of supported lipid bilayers using atomic force microscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1798:750-65. [DOI: 10.1016/j.bbamem.2009.07.026] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2009] [Revised: 07/17/2009] [Accepted: 07/23/2009] [Indexed: 12/11/2022]
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12
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Ye G, Gupta A, DeLuca R, Parang K, Bothun GD. Bilayer disruption and liposome restructuring by a homologous series of small Arg-rich synthetic peptides. Colloids Surf B Biointerfaces 2010; 76:76-81. [PMID: 19913394 DOI: 10.1016/j.colsurfb.2009.10.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Revised: 10/06/2009] [Accepted: 10/08/2009] [Indexed: 11/24/2022]
Abstract
The effects of a series of low molecular weight water-soluble cationic linear peptide analogs (LPAs, <1000 MW) with increasing hydrophobic/hydrophilic balance on lipid bilayer phase behavior and permeability were examined using liposomes composed of zwitterionic dipalmitoylphosphatidylcholine (DPPC) and mixed zwitterionic/anionic DPPC/dipalmitoylphosphatidylglycerol (DPPG) lipid bilayers. LPAs were synthesized using a previously reported alkyl linkage strategy as Arg-C(n)-Arg-C(n)-Lys, where C(n) represents the saturated alkyl linkage separating the cationic residues (n=4, 7, or 11) (Ye et al., 2007 [1]). Differential scanning calorimetry results show that the cationic LPAs bound to and disrupted DPPC and, to a greater extent, DPPC/DPPG phase behavior. When added to preformed unilamellar liposomes, the LPAs led to significant structural changes based on cryogenic transmission electron microscopy (cryo-TEM). Coupling cryo-TEM with carboxyfluorescein leakage studies indicate that the LPAs induced permeabilization through bilayer expansion, which caused membrane thinning. The effects were inconsistent with increasing LPA hydrophobicity, which suggests that a cooperative effect between electrostatic binding and hydrophobic insertion determined the location of LPAs within the bilayer and their membrane activity. Our results for LPA-induced membrane disruption correlate with previous breast cancer cell uptake studies that showed minimal LPA-C(4) uptake, but high LPA-C(11) uptake through a non-endocytic mechanism.
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Affiliation(s)
- Guofeng Ye
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA
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13
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Pakkanen KI, Duelund L, Vuento M, Ipsen JH. Phase coexistence in a triolein-phosphatidylcholine system. Implications for lysosomal membrane properties. Chem Phys Lipids 2009; 163:218-27. [PMID: 19962372 DOI: 10.1016/j.chemphyslip.2009.11.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2009] [Revised: 10/10/2009] [Accepted: 11/25/2009] [Indexed: 10/20/2022]
Abstract
The effects of tri- and monoglycerides on phospholipid (POPC) membranes were studied using spectroscopical methods. Triolein was found to form two types of POPC-rich membranes, both with POPC or as a three-component system with monopalmitin. These two membrane types were determined as co-existing phases based on their spontaneous and stable separation and named heavy and light phase according to their sedimentation behaviour. Marked differences were seen in the physical properties of these phases, even though only minor compositional variation was detected. The light, less polar phase was found to be less ordered and more fluid and seemed to allow significantly lower amount of water penetration into the membrane-water interface than pure POPC membrane. The heavy phase, apart from their slightly altered water penetration, resembled more a pure POPC membrane. As triglycerides are present in lysosomal membranes, the present results can be seen as an implication for polarity-based water permeability barrier possibly contributing to the integrity of lysosomes.
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Affiliation(s)
- Kirsi I Pakkanen
- Nanoscience Center, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
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14
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Fox CB, Wayment JR, Myers GA, Endicott SK, Harris JM. Single-Molecule Fluorescence Imaging of Peptide Binding to Supported Lipid Bilayers. Anal Chem 2009; 81:5130-8. [DOI: 10.1021/ac9007682] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher B. Fox
- Department of Bioengineering, University of Utah, 50 South Central Campus Drive, Salt Lake City, Utah 84112-9202, Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, and HSC Core Research Facilities, University of Utah, 50 North Medical Drive, Salt Lake City, Utah 84132
| | - Joshua R. Wayment
- Department of Bioengineering, University of Utah, 50 South Central Campus Drive, Salt Lake City, Utah 84112-9202, Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, and HSC Core Research Facilities, University of Utah, 50 North Medical Drive, Salt Lake City, Utah 84132
| | - Grant A. Myers
- Department of Bioengineering, University of Utah, 50 South Central Campus Drive, Salt Lake City, Utah 84112-9202, Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, and HSC Core Research Facilities, University of Utah, 50 North Medical Drive, Salt Lake City, Utah 84132
| | - Scott K. Endicott
- Department of Bioengineering, University of Utah, 50 South Central Campus Drive, Salt Lake City, Utah 84112-9202, Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, and HSC Core Research Facilities, University of Utah, 50 North Medical Drive, Salt Lake City, Utah 84132
| | - Joel M. Harris
- Department of Bioengineering, University of Utah, 50 South Central Campus Drive, Salt Lake City, Utah 84112-9202, Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, and HSC Core Research Facilities, University of Utah, 50 North Medical Drive, Salt Lake City, Utah 84132
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15
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Yaroslavov AA, Sitnikova TA, Rakhnyanskaya AA, Yaroslavova EG, Davydov DA, Burova TV, Grinberg VY, Shi L, Menger FM. Biomembrane sensitivity to structural changes in bound polymers. J Am Chem Soc 2009; 131:1666-7. [PMID: 19152326 DOI: 10.1021/ja808461s] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Anionic liposomes containing a 4:1 molar ratio of neutral to anionic phospholipids were treated with an excess of five zwitterionic polymers differing only in the spacer length separating their cationic and anionic moieties. Although the polymers do not disrupt the structural integrity of the liposomes, they can induce spacer-dependent molecular rearrangements within the liposomes. Thus, the following were observed: spacer length = 1, no binding to the liposomes; spacer length = 2, adsorption to the liposomes, but no molecular rearrangement; spacer length = 3, lateral lipid segregation but little or no flip-flop; spacer length = 4 or 5, lateral lipid segregation and flip-flop. These diverse behaviors are relevant to the use of biomedical formulations where polyelectrolytes play a role.
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Affiliation(s)
- Alexander A Yaroslavov
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow, RF
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16
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Erickson B, DiMaggio S, Mullen DG, Kelly CV, Leroueil PR, Berry SA, Baker JR, Orr BG, Banaszak Holl MM. Interactions of poly(amidoamine) dendrimers with Survanta lung surfactant: the importance of lipid domains. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:11003-11008. [PMID: 18763817 PMCID: PMC2917325 DOI: 10.1021/la801497d] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The interaction of generation 5 (G5) and 7 (G7) poly(amidoamine) (PAMAM) dendrimers with mica-supported Survanta bilayers is studied with atomic force microscopy (AFM). In these experiments, Survanta forms distinct gel and fluid domains with differing lipid composition. Nanoscale defects are induced by the PAMAM dendrimers. The positively charged dendrimers remove lipid from the fluid domains at a significantly greater rate than for the gel domains. Dendrimer accumulation on lipid edges and terraces preceding lipid removal has been directly imaged. Immediately following lipid removal, the mica surface is clean, indicating that lipid defects are not induced by dendrimers binding to the mica substrate and displacing the lipid.
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Affiliation(s)
| | | | | | | | | | | | | | - Bradford G. Orr
- To whom correspondence should be addressed. Phone: 734-936-3609(B.G.O);734-763-2283(M.M.B.H.). (B.G.O.); (M.M.B.H.)
| | - Mark M. Banaszak Holl
- To whom correspondence should be addressed. Phone: 734-936-3609(B.G.O);734-763-2283(M.M.B.H.). (B.G.O.); (M.M.B.H.)
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Affiliation(s)
- Daniel J. Muller
- Biotechnology Center, Technische Universität Dresden, D-01307 Dresden, Germany
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Effects of palmitoylation on dynamics and phospholipid-bilayer-perturbing properties of the N-terminal segment of pulmonary surfactant protein SP-C as shown by 2H-NMR. Biophys J 2008; 95:2308-17. [PMID: 18502795 DOI: 10.1529/biophysj.108.132845] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
It has been proposed that palmitoylation of the N-terminal segment of surfactant protein SP-C is important for maintaining association of pulmonary surfactant complexes with interfacial films compressed to high pressures at the end of expiration. In this study, we examined surfactant membrane models containing palmitoylated and nonpalmitoylated synthetic peptides, based on the N-terminal SP-C sequence, in dipalmitoylphosphatidylcholine (DPPC)/egg phosphatidylglycerol (7:3, w/w) by (2)H-NMR. Perturbations of lipid properties by the peptide versions were compared in samples containing chain- and headgroup-deuterated lipid (DPPC-d(62) and DPPC-d(4) respectively). Also, deuterated peptide palmitate chains were compared with those of DPPC in otherwise identical lipid-protein mixtures. Palmitoylated peptide increased average DPPC-d(62) chain orientational order slightly, particularly for temperatures spanning gel and liquid crystalline coexistence, implying penetration of palmitoylated peptide into ordered membrane. In contrast, the nonpalmitoylated peptide had a small disordering effect in this temperature range. Both peptide versions perturbed DPPC-d(4) headgroup orientation similarly, suggesting little effect of palmitoylation on the largely electrostatic peptide-headgroup interaction. Deuterated acyl chains attached to the SP-C N-terminal segment displayed a qualitatively different distribution of chain order, and lower average order, than DPPC-d(62) in the same membranes. This likely reflects local perturbation of lipid headgroup spacing by the peptide portion interacting with the bilayer near the peptide palmitate chains. This study suggests that SP-C-attached acyl chains could be important for coupling of lipid and protein motions in surfactant bilayers and monolayers, especially in the context of ordered phospholipid structures such as those potentially formed during exhalation, when stabilization of the respiratory surface by surfactant is the most crucial.
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Plasencia I, Baumgart F, Andreu D, Marsh D, Pérez-Gil J. Effect of acylation on the interaction of the N-Terminal segment of pulmonary surfactant protein SP-C with phospholipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1274-82. [DOI: 10.1016/j.bbamem.2008.02.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Revised: 01/22/2008] [Accepted: 02/07/2008] [Indexed: 02/02/2023]
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Khandelia H, Ipsen JH, Mouritsen OG. The impact of peptides on lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1528-36. [PMID: 18358231 DOI: 10.1016/j.bbamem.2008.02.009] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Revised: 02/22/2008] [Accepted: 02/24/2008] [Indexed: 11/26/2022]
Abstract
We review the fundamental strategies used by small peptides to associate with lipid membranes and how the different strategies impact on the structure and dynamics of the lipids. In particular we focus on the binding of amphiphilic peptides by electrostatic and hydrophobic forces, on the anchoring of peptides to the bilayer by acylation and prenylation, and on the incorporation of small peptides that form well-defined channels. The effect of lipid-peptide interactions on the lipids is characterized in terms of lipid acyl-chain order, membrane thickness, membrane elasticity, permeability, lipid-domain and annulus formation, as well as acyl-chain dynamics. The different situations are illustrated by specific cases for which experimental observations can be interpreted and supplemented by theoretical modeling and simulations. A comparison is made with the effect on lipids of trans-membrane proteins. The various cases are discussed in the context of the possible roles played by lipid-peptide interactions for the biological, physiological, and pharmacological function of peptides.
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Affiliation(s)
- Himanshu Khandelia
- MEMPHYS-Center for Biomembrane Physics, Department of Physics and Chemistry, University of Southern Denmark, Campusvej 55, Odense M, Denmark
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Oliynyk V, Kaatze U, Heimburg T. Defect formation of lytic peptides in lipid membranes and their influence on the thermodynamic properties of the pore environment. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2007; 1768:236-45. [PMID: 17141732 DOI: 10.1016/j.bbamem.2006.10.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Revised: 10/10/2006] [Accepted: 10/11/2006] [Indexed: 10/24/2022]
Abstract
We present an experimental study of the pore formation processes of small amphipathic peptides in model phosphocholine lipid membranes. We used atomic force microscopy to characterize the spatial organization and structure of alamethicin- and melittin-induced defects in lipid bilayer membranes and the influence of the peptide on local membrane properties. Alamethicin induced holes in gel DPPC membranes were directly visualized at different peptide concentrations. We found that the thermodynamic state of lipids in gel membranes can be influenced by the presence of alamethicin such that nanoscopic domains of fluid lipids form close to the peptide pores, and that the elastic constants of the membrane are altered in their vicinity. Melittin-induced holes were visualized in DPPC and DLPC membranes at room temperature in order to study the influence of the membrane state on the peptide induced hole formation. Also differential scanning calorimetry was used to investigate the effect of alamethicin on the lipid membrane phase behaviour.
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Affiliation(s)
- Vitaliy Oliynyk
- Complex Fluids Group, Drittes Physikalisches Institut, Georg-August Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
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Dwiecki K, Górnas P, Wilk A, Nogala-Kałucka M, Polewski K. Spectroscopic studies of D-alpha-tocopherol concentration-induced transformation in egg phosphatidylcholine vesicles. Cell Mol Biol Lett 2006; 12:51-69. [PMID: 17124545 PMCID: PMC6275860 DOI: 10.2478/s11658-006-0059-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2006] [Accepted: 08/09/2006] [Indexed: 12/05/2022] Open
Abstract
The effects of embedding up to 60 mol% of α-tocopherol (α-Toc) on the morphology and structure of the egg phosphatidylcholine (PC) membrane were studied using spectroscopic techniques. The resulting vesicles were subjected to turbidometric and dynamic light scattering measurements to evaluate their size distribution. The α-Toc intrinsic fluorescence and its quenching was used to estimate the tocopherol position in the membrane. Optical microscopy was used to visualize morphological changes in the vesicles during the inclusion of tocopherol into the 2 mg/ml PC membrane. The incorporation of up to 15 mol% of tocopherol molecules into PC vesicles is accompanied by a linear increase in the fluorescence intensity and the simultaneous formation of larger, multilamellar vesicles. Increasing the tocopherol concentration above 20 mol% induced structural and morphological changes leading to the disappearance of micrometer-sized vesicles and the formation of small unilamellar vesicles of size ranging from 30 to 120 nm, mixed micelles and non-lamellar structures.
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