1
|
Schiroli D, Gómara MJ, Maurizi E, Atkinson SD, Mairs L, Christie KA, Cobice DF, McCrudden CM, Nesbit MA, Haro I, Moore T. Effective In Vivo Topical Delivery of siRNA and Gene Silencing in Intact Corneal Epithelium Using a Modified Cell-Penetrating Peptide. MOLECULAR THERAPY. NUCLEIC ACIDS 2019; 17:891-906. [PMID: 31476668 PMCID: PMC6723413 DOI: 10.1016/j.omtn.2019.07.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 07/18/2019] [Accepted: 07/19/2019] [Indexed: 01/03/2023]
Abstract
Autosomal dominantly inherited genetic disorders such as corneal dystrophies are amenable to allele-specific gene silencing with small interfering RNA (siRNA). siRNA delivered to the cornea by injection, although effective, is not suitable for a frequent long-term treatment regimen, whereas topical delivery of siRNA to the cornea is hampered by the eye surface's protective mechanisms. Herein we describe an attractive and innovative alternative for topical application using cell-penetrating peptide derivatives capable of complexing siRNA non-covalently and delivering them into the cornea. Through a rational design approach, we modified derivatives of a cell-penetrating peptide, peptide for ocular delivery (POD), already proved to diffuse into the corneal layers. These POD derivatives were able to form siRNA-peptide complexes (polyplexes) of size and ζ-potential similar to those reported able to undergo cellular internalization. Successful cytoplasmic release and gene silencing in vitro was obtained when an endosomal disruptor, chloroquine, was added. A palmitoylated-POD, displaying the best delivery properties, was covalently functionalized with trifluoromethylquinoline, an analog of chloroquine. This modified POD, named trifluoromethylquinoline-palmitoyl-POD (QN-Palm-POD), when complexed with siRNA and topically applied to the eye in vivo, resulted in up to 30% knockdown of luciferase reporter gene expression in the corneal epithelium. The methods developed within represent a valid standardized approach that is ideal for screening of a range of delivery formulations.
Collapse
Affiliation(s)
- Davide Schiroli
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland
| | - María J Gómara
- Unit of Synthesis and Biomedical Applications of Peptides, Department of Biomedical Chemistry, Institute for Advanced Chemistry of Catalonia, Consejo Superior de Investigaciones Científicas (IQAC-CSIC), Barcelona, Spain
| | - Eleonora Maurizi
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland
| | - Sarah D Atkinson
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland; Northern Ireland Centre for Stratified Medicine, University of Ulster, Londonderry BT47 6SB, UK
| | - Laura Mairs
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland
| | - Kathleen A Christie
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland
| | - Diego F Cobice
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland
| | - Cian M McCrudden
- School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland
| | - M Andrew Nesbit
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland
| | - Isabel Haro
- Unit of Synthesis and Biomedical Applications of Peptides, Department of Biomedical Chemistry, Institute for Advanced Chemistry of Catalonia, Consejo Superior de Investigaciones Científicas (IQAC-CSIC), Barcelona, Spain
| | - Tara Moore
- Biomedical Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, Northern Ireland.
| |
Collapse
|
2
|
Chen L, Zhang S, Pan X, Hu X, Zhang YH, Yuan F, Huang T, Cai YD. HIV infection alters the human epigenetic landscape. Gene Ther 2018; 26:29-39. [PMID: 30443044 DOI: 10.1038/s41434-018-0051-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/30/2018] [Accepted: 10/31/2018] [Indexed: 02/07/2023]
Abstract
Many complex diseases or traits are the results of both genetic and environmental factors. The environmental factors affect the human body by modifying its epigenetics, which controls the activity of genomes without mutating it. Viral infection is one of the common environmental factors for complex diseases. For example, the human immunodeficiency virus (HIV) infection can cause acquired immune deficiency syndrome (AIDS), HBV, and HCV infections are associated with hepatocellular carcinoma, and human papillomavirus infection is a causal factor in cervical carcinoma. In this study, to investigate how HIV infection affects DNA methylation, we analyzed the blood DNA methylation data of 485 512 sites in 44 HIV- and 142 HIV + patients. Several advanced computational methods were applied to identify the core distinctive features that were different between the HIV patients and the healthy controls. These methods can be used for differentiating HIV-infected patients from uninfected ones. These core distinctive DNA methylation features were confirmed to be functionally connected to premature aging and abnormal immune regulation, two typical pathological symptoms of HIV infection, revealing the potential regulatory mechanisms of HIV infection on the DNA methylation status of the host cells and provided novel insights on the pathogenesis of HIV infection and AIDS.
Collapse
Affiliation(s)
- Lei Chen
- School of Life Sciences, Shanghai University, Shanghai, 200444, China.,Shanghai Key Laboratory of PMMP, East China Normal University, Shanghai, 200241, China.,College of Information Engineering, Shanghai Maritime University, Shanghai, 201306, China
| | - Shiqi Zhang
- Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark
| | - Xiaoyong Pan
- Department of Medical Informatics, Erasmus MC, Rotterdam, Netherlands
| | - XiaoHua Hu
- Department of Biostatistics and Computational Biology, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Yu-Hang Zhang
- Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Fei Yuan
- Department of Science & Technology, Binzhou Medical University Hospital, Binzhou, 256603, Shandong, China
| | - Tao Huang
- Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China.
| | - Yu-Dong Cai
- School of Life Sciences, Shanghai University, Shanghai, 200444, China.
| |
Collapse
|
3
|
Guo C, Dugas T, Scates C, Garcia-Villarreal M, Ticich T, McMartin KE. Aluminum citrate blocks toxicity of calcium oxalate crystals by preventing binding with cell membrane phospholipids. Am J Nephrol 2013; 37:41-9. [PMID: 23295956 DOI: 10.1159/000345985] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 11/21/2012] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS Renal damage from ethylene glycol and primary hyperoxaluria is linked to accumulation of calcium oxalate monohydrate (COM) crystals in the renal proximal tubule (PT). In vitro studies have shown that aluminum citrate (AC), uniquely among citrate salts, blocks COM cytotoxicity to tubular cells. These studies were designed to evaluate the interaction of COM with membrane phospholipids and the ability of AC to reduce COM toxicity by interfering with this interaction. METHODS Interaction of COM with phospholipids was assessed using differential scanning calorimetric analysis of structural changes in specific liposomes. Interaction of COM with cell membranes was studied by measuring binding of radiolabeled crystals by human PT (HPT) cells. RESULTS Analysis of liposomes prepared from phosphatidylserine (PS) or phosphatidylcholine (PC) showed that COM interfered with the gel-liquid transition of PS liposomes, but not that of PC liposomes. AC reversed the COM-induced changes in liposomal structure. AC inhibited the binding of [(14)C]-COM by HPT cells in a concentration-dependent manner. AC blocked COM binding by interacting with the crystal surface and not the cell membrane. CONCLUSION These results indicate that AC blocks the binding of COM by PT cells, and consequently its cytotoxicity, by attaching to the surface of the crystal. Thus, AC, or a related compound that works by the same mechanism, could be a useful adjunct therapy to reduce the renal damage produced by severe hyperoxaluria.
Collapse
Affiliation(s)
- Chungang Guo
- Department of Pharmacology, Toxicology and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA 71130-3932, USA
| | | | | | | | | | | |
Collapse
|
4
|
Sánchez-Martín MJ, Busquets MA, Girona V, Haro I, Alsina MA, Pujol M. Effect of E1(64–81) hepatitis G peptide on the in vitro interaction of HIV-1 fusion peptide with membrane models. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:2178-88. [DOI: 10.1016/j.bbamem.2011.05.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 05/07/2011] [Accepted: 05/27/2011] [Indexed: 01/01/2023]
|
5
|
Analysis of HIV-1 fusion peptide inhibition by synthetic peptides from E1 protein of GB virus C. J Colloid Interface Sci 2011; 360:124-31. [DOI: 10.1016/j.jcis.2011.04.053] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 04/11/2011] [Accepted: 04/12/2011] [Indexed: 11/15/2022]
|
6
|
Herrera E, Tenckhoff S, Gómara MJ, Galatola R, Bleda MJ, Gil C, Ercilla G, Gatell JM, Tillmann HL, Haro I. Effect of Synthetic Peptides Belonging to E2 Envelope Protein of GB Virus C on Human Immunodeficiency Virus Type 1 Infection. J Med Chem 2010; 53:6054-63. [DOI: 10.1021/jm100452c] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Elena Herrera
- Unit of Synthesis and Biomedical Applications of Peptides (IQAC-CSIC), Barcelona, Spain
| | | | - María J. Gómara
- Unit of Synthesis and Biomedical Applications of Peptides (IQAC-CSIC), Barcelona, Spain
| | - Ramona Galatola
- Unit of Synthesis and Biomedical Applications of Peptides (IQAC-CSIC), Barcelona, Spain
| | - María J. Bleda
- Unit of Synthesis and Biomedical Applications of Peptides (IQAC-CSIC), Barcelona, Spain
| | | | - Guadalupe Ercilla
- Services of Infectious Diseases and Immunology, Hospital Clinic Barcelona, University of Barcelona, Spain
| | - José M. Gatell
- AIDS-Research Group, IDIBAPS, Barcelona, Spain
- Services of Infectious Diseases and Immunology, Hospital Clinic Barcelona, University of Barcelona, Spain
| | - Hans L. Tillmann
- Faculty of Medicine, University of Leipzig, Leipzig, Germany
- GI/Hepatology Research Program, Division of Gastroenterology, Duke Clinical Research Institute, Duke University, Durham, North Carolina
| | - Isabel Haro
- Unit of Synthesis and Biomedical Applications of Peptides (IQAC-CSIC), Barcelona, Spain
| |
Collapse
|
7
|
Sánchez-Martín MJ, Amigo JM, Pujol M, Haro I, Alsina MA, Busquets MA. Fluorescence study of the dynamic interaction between E1(145–162) sequence of hepatitis GB virus C and liposomes. Anal Bioanal Chem 2009; 394:1003-10. [DOI: 10.1007/s00216-008-2593-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2008] [Revised: 12/16/2008] [Accepted: 12/19/2008] [Indexed: 11/29/2022]
|
8
|
Pérez-López S, Vila-Romeu N, Alsina Esteller MA, Espina M, Haro I, Mestres C. Interaction of GB Virus C/Hepatitis G Virus Synthetic Peptides with Lipid Langmuir Monolayers and Large Unilamellar Vesicles. J Phys Chem B 2008; 113:319-27. [DOI: 10.1021/jp806938y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Silvia Pérez-López
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Nuria Vila-Romeu
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - M. Asunción Alsina Esteller
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Marta Espina
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Isabel Haro
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| | - Concepció Mestres
- Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain, Department of Physical Chemistry, Faculty of Sciences, University of Vigo, Campus of Ourense, 32004 Ourense, Spain, and Unit of Synthesis and Biomedical Application of Peptides, Department of Biomedical Chemistry, IQAC-CSIC, Barcelona, Spain
| |
Collapse
|
9
|
Fernández-Vidal M, Rojo N, Herrera E, Gómara MJ, Haro I. Liposome destabilization induced by synthetic lipopeptides corresponding to envelope and non-structural domains of GBV-C/HGV virus. Conformational requirements for leakage. Biophys Chem 2008; 132:55-63. [DOI: 10.1016/j.bpc.2007.10.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2007] [Revised: 10/16/2007] [Accepted: 10/16/2007] [Indexed: 11/26/2022]
|
10
|
Mazzini S, Fernandez-Vidal M, Galbusera V, Castro-Roman F, Bellucci MC, Ragg E, Haro I. 3D-Structure of the interior fusion peptide of HGV/GBV-C by 1H NMR, CD and molecular dynamics studies. Arch Biochem Biophys 2007; 465:187-96. [PMID: 17603997 DOI: 10.1016/j.abb.2007.05.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2007] [Revised: 05/28/2007] [Accepted: 05/30/2007] [Indexed: 11/24/2022]
Abstract
In this work, we present a structural characterization of the putative fusion peptide E2(279-298) corresponding to the E2 envelope protein of the HGV/GBV-C virus by (1)H NMR, CD and MD studies performed in H(2)O/TFE and in lipid model membranes. The peptide is largely unstructured in water, whereas in H(2)O/TFE and in model membranes it adopts an helical structure (approximately 65-70%). The partitioning free energy DeltaG ranges from -6 to -7.5 kcal mol(-1). OCD measurements on peptide-containing hydrated and oriented lipid multilayers showed that the peptide adopts a predominantly surface orientation. The (1)H NMR data (observed NOEs, deuterium exchange rates, Halpha chemical shift index and vicinal coupling constants) and the molecular dynamics calculations support the conclusions that the peptide adopts a stable helix in the C-terminal 9-18 residues slightly inserted into the lipid bilayer and a major mobility in the amino terminus of the sequence (1-8 residues).
Collapse
Affiliation(s)
- S Mazzini
- Department of Agri-Food Molecular Sciences, Università degli Studi, via Celoria 2, 20133 Milano, Italy.
| | | | | | | | | | | | | |
Collapse
|
11
|
Weroński K, Busquets MA, Girona V, Prat J. Influence of lipidation of GBV-C/HGV NS3 (513-522) and (505-514) peptide sequences on its interaction with mono and bilayers. Colloids Surf B Biointerfaces 2006; 57:8-16. [PMID: 17292591 DOI: 10.1016/j.colsurfb.2006.11.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2006] [Revised: 09/26/2006] [Accepted: 11/27/2006] [Indexed: 11/19/2022]
Abstract
Two decapeptide fragments of the non-structural hepatitis G NS3 protein (GBV-C/HGV), 513-522 (RGRTGRGRSG) and 505-514 (SAELSMQRRG), as well as their palmitoylated derivatives were synthesized. The physico-chemical properties of the peptides were analyzed in both the absence and presence of the zwitterionic 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC), the negative 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (DPPG) and the positive 1,2-dioeloyl-3-trimethylammonium-propane (DOTAP) lipid monolayers. Based on their high hydrophilic properties, neither parent peptide presented surface activity and their incorporation into lipid monolayers was low. In contrast, their palmitoylated derivatives showed concentration-dependent surface activity and could be inserted into lipid monolayers to varying degrees depending on their sequence. Compression isotherms showed that the presence of palmitoylated peptides in the subphase resulted in a molecular arrangement less condensed than that corresponding to the pure phospholipid. In concordance with the monolayer results, differential scanning calorimetry (DSC) demonstrated that the parent peptides did not have any effect on the thermograms, while the palmitoylated derivatives affected the thermotropic properties of DPPC bilayers.
Collapse
Affiliation(s)
- Konrad Weroński
- Physical Chemistry Department, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain.
| | | | | | | |
Collapse
|
12
|
Larios C, Casas J, Mestres C, Haro I, Alsina MA. Perturbations induced by synthetic peptides from hepatitis G virus structural proteins in lipid model membranes: a fluorescent approach. LUMINESCENCE 2005; 20:279-81. [PMID: 16134194 DOI: 10.1002/bio.850] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The name HGV/GBV-C remains as an acronym for hepatitis G virus (HGV) and GB virus-C (GBV-C), strain variants of this enveloped RNA virus independently but simultaneously discovered in 1995. Nowadays there is no evidence that it causes hepatitis in humans either during initial infection or after long-term carriage, but it has been recently related with HIV regarding the inhibition of progression to AIDS. The overall genomic organization of HGV/GBV-C is similar to that of hepatitis C virus (HCV) and other members of the Flavivirus family in Hepacivirus genus. Although a stretch of conserved, hydrophobic amino acids within the envelop glycoprotein of HCV has been proposed as the virus fusion peptide, the mode of entry of GBV-C/HGV into target cells is at present unknown. In the present work, sequences derived from the structural E2-protein of HGV/GBV-C have been selected by means of semiempirical methods and then synthesized manually following solid-phase methodologies. Their ability to induce perturbations in model membranes has been analysed by measuring the penetration of such peptides in lipid monolayers and by a series of experiments based on tryptophan peptide fluorescence emission spectra. Besides, release of vesicular contents to the medium was monitored by the ANTS/DPX assay. The membrane destabilization properties of these peptides was found very related with the length of the sequence.
Collapse
Affiliation(s)
- Cristina Larios
- Department of Peptide and Protein Chemistry, IIQAB-CSIC, Jordi Girona 18-16, E-08034 Barcelona, Spain
| | | | | | | | | |
Collapse
|
13
|
Larios C, Christiaens B, Gómara MJ, Alsina MA, Haro I. Interaction of synthetic peptides corresponding to hepatitis G virus (HGV/GBV-C) E2 structural protein with phospholipid vesicles. FEBS J 2005; 272:2456-66. [PMID: 15885095 DOI: 10.1111/j.1742-4658.2005.04666.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction with phospholipid bilayers of two synthetic peptides with sequences corresponding to a segment next to the native N-terminus and an internal region of the E2 structural hepatitis G virus (HGV/GBV-C) protein [E2(7-26) and E2(279-298), respectively] has been characterized. Both peptides are water soluble but associate spontaneously with bilayers, showing higher affinity for anionic than zwitterionic membranes. However, whereas the E2(7-26) peptide is hardly transferred at all from water to the membrane interface, the E2(279-298) peptide is able to penetrate into negatively charged bilayers remaining close to the lipid/water interface. The nonpolar environment clearly induces a structural transition in the E2(279-298) peptide from random coil to alpha-helix, which causes bilayer perturbations leading to vesicle permeabilization. The results indicate that this internal segment peptide sequence is involved in the fusion of HGV/GBV-C to membrane.
Collapse
Affiliation(s)
- Cristina Larios
- Department of Peptide and Protein Chemistry, IIQAB-CSIC, Barcelona, Spain
| | | | | | | | | |
Collapse
|
14
|
Alay M, Asunción Alsina M, Haro I, Prat J, Busquets MA. Analysis of the effect of a peptide sequence of the E2 protein (HGV/GBV-C) on the physicochemical properties of zwitterionic and negatively charged bilayers. LUMINESCENCE 2005; 20:445-50. [PMID: 15966052 DOI: 10.1002/bio.871] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The membrane-interacting properties of a potential epitope of GB virus C/hepatitis G virus located at the region (99-118) of the E2 structural protein were investigated using several fluorescence techniques. SUV of DMPC:DPPC (1:1) or DMPG:DPPC (1:1) zwitterionic and anionic mixtures, respectively, were used as model membranes. FRET with NBD-PE as energy donor and Rho-PE as energy acceptor-labelled SUV indicated that the peptide was able to fuse both zwitterionic and anionic SUVs, the latter requiring lower peptide concentrations. However, the peptide increased the steady-state anisotropy of DPH embedded in the hydrophobic centre of the membrane with zwitterionic headgroups and to a lesser extent in anionic bilayers, suggesting that charge-charge interactions are not required for membrane interactions and also confirming the FRET results. No changes in anisotropy were observed with the probe TMA-DPH located at the surface of the bilayer. Finally, analysis of the intrinsic emission fluorescence of the tryptophan residue, upon incubation with SUV, showed a blue shift in the presence of anionic bilayers, both below and above the main transition temperature (T(m)) (gel to liquid-crystalline state) and, to a lesser extent, with the zwitterionic model membrane.
Collapse
Affiliation(s)
- Maite Alay
- Associated Unity to the CSIC, Peptides and Proteins: Physical Chemistry Studies, Physical Chemistry Department, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII, s/n 08028 Barcelona, Spain
| | | | | | | | | |
Collapse
|
15
|
Larios C, Busquets MA, Carilla J, Alsina MA, Haro I. Effects of overlapping GB virus C/hepatitis G virus synthetic peptides on biomembrane models. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:11149-11160. [PMID: 15568870 DOI: 10.1021/la048551g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The present study was undertaken to examine the physicochemical properties of three overlapping peptides belonging to the E2 envelope protein of Hepatitis G virus (GBV-C/HGV) and its interaction with phospholipid biomembrane models using biophysical techniques. We describe our findings concerning the surface activity and the interaction of the peptides with monolayers and liposomes composed of the zwitterionic phospholipids dipalmitoylphosphatidylcholine and dimyristoylphosphatidylcholine (DMPC) and a mixture of DMPC with the anionic phospholipid dimyristoylphosphatidylglycerol. The results inform about the effect of the chain length on their interaction with biomembrane models. The longest chain peptide interacts in a higher extent with all the phospholipid studied as a result of a combination of hydrophobic and electrostatic forces.
Collapse
Affiliation(s)
- Cristina Larios
- Department of Peptide Protein Chemistry and Laboratory of Thermal Analysis, IIQAB-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain
| | | | | | | | | |
Collapse
|
16
|
Dastis M, Rojo N, Alsina MA, Haro I, Panda AK, Mestres C. Study in mono and bilayers of the interaction of hepatitis G virus (GBV-C/HGV) synthetic antigen E2(99-118) with cell membrane phospholipids. Biophys Chem 2004; 109:375-85. [PMID: 15110935 DOI: 10.1016/j.bpc.2003.12.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2003] [Revised: 12/16/2003] [Accepted: 12/19/2003] [Indexed: 11/26/2022]
Abstract
The interaction of the hepatitis G synthetic peptide E2(99-118) with cell membrane phospholipids of different characteristics such as dipalmitoylphosphatidylcholine (DPPC) and dipalmitoylphosphatidylglycerol (DPPG) was studied by Langmuir isotherms. Epifluorescence microscopy and Atomic force microscopy (AFM) was also used to study interactions with DPPC. Compression isotherms of DPPC/E2(99-118) and DPPG/E2(99-118) mixed monolayers showed negative deviation from ideallity consistent with the existence of attractive interactions. The incorporation of the peptide in DPPC monolayer was also confirmed in epifluorescence microscopy and AFM studies. The peptide retarded the formation of DPPC domains and did not let the phospholipid get organized. No important differences in the interactions with DPPC (neutral) or DPPG (anionic) were found, thus suggesting that electrostatics forces do not have a predominant influence in these interactions.
Collapse
Affiliation(s)
- Macarena Dastis
- Department of Physiochemistry, Faculty of Pharmacy, University of Barcelona, Av. Joan XXIII s.n., 08028 Barcelona, Spain
| | | | | | | | | | | |
Collapse
|