1
|
Ghanimi Fard M, Khabir Z, Reineck P, Cordina NM, Abe H, Ohshima T, Dalal S, Gibson BC, Packer NH, Parker LM. Targeting cell surface glycans with lectin-coated fluorescent nanodiamonds. NANOSCALE ADVANCES 2022; 4:1551-1564. [PMID: 36134370 PMCID: PMC9418452 DOI: 10.1039/d2na00036a] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 02/06/2022] [Indexed: 06/02/2023]
Abstract
Glycosylation is arguably the most important functional post-translational modification in brain cells and abnormal cell surface glycan expression has been associated with neurological diseases and brain cancers. In this study we developed a novel method for uptake of fluorescent nanodiamonds (FND), carbon-based nanoparticles with low toxicity and easily modifiable surfaces, into brain cell subtypes by targeting their glycan receptors with carbohydrate-binding lectins. Lectins facilitated uptake of 120 nm FND with nitrogen-vacancy centers in three types of brain cells - U87-MG astrocytes, PC12 neurons and BV-2 microglia cells. The nanodiamond/lectin complexes used in this study target glycans that have been described to be altered in brain diseases including sialic acid glycans via wheat (Triticum aestivum) germ agglutinin (WGA), high mannose glycans via tomato (Lycopersicon esculentum) lectin (TL) and core fucosylated glycans via Aleuria aurantia lectin (AAL). The lectin conjugated nanodiamonds were taken up differently by the various brain cell types with fucose binding AAL/FNDs taken up preferentially by glioblastoma phenotype astrocyte cells (U87-MG), sialic acid binding WGA/FNDs by neuronal phenotype cells (PC12) and high mannose binding TL/FNDs by microglial cells (BV-2). With increasing recognition of glycans having a role in many diseases, the lectin bioconjugated nanodiamonds developed here are well suited for further investigation into theranostic applications.
Collapse
Affiliation(s)
- Mina Ghanimi Fard
- School of Natural Sciences, Centre of Excellence for Nanoscale BioPhotonics, Macquarie University Sydney NSW 2109 Australia +61 2 9850 8269
| | - Zahra Khabir
- School of Natural Sciences, Centre of Excellence for Nanoscale BioPhotonics, Macquarie University Sydney NSW 2109 Australia +61 2 9850 8269
| | - Philipp Reineck
- ARC Centre of Excellence for Nanoscale BioPhotonics, School of Science, RMIT University Melbourne VIC 3001 Australia
| | - Nicole M Cordina
- School of Natural Sciences, Centre of Excellence for Nanoscale BioPhotonics, Macquarie University Sydney NSW 2109 Australia +61 2 9850 8269
| | - Hiroshi Abe
- Quantum Beam Science Research Directorate, The Institute for Quantum Life Science, National Institutes for Quantum Science and Technology Takasaki Gunma 3701292 Japan
| | - Takeshi Ohshima
- Quantum Beam Science Research Directorate, The Institute for Quantum Life Science, National Institutes for Quantum Science and Technology Takasaki Gunma 3701292 Japan
| | - Sagar Dalal
- School of Natural Sciences, Centre of Excellence for Nanoscale BioPhotonics, Macquarie University Sydney NSW 2109 Australia +61 2 9850 8269
| | - Brant C Gibson
- ARC Centre of Excellence for Nanoscale BioPhotonics, School of Science, RMIT University Melbourne VIC 3001 Australia
| | - Nicolle H Packer
- School of Natural Sciences, Centre of Excellence for Nanoscale BioPhotonics, Macquarie University Sydney NSW 2109 Australia +61 2 9850 8269
- Institute for Glycomics, Griffith University Southport QLD 4222 Australia
| | - Lindsay M Parker
- School of Natural Sciences, Centre of Excellence for Nanoscale BioPhotonics, Macquarie University Sydney NSW 2109 Australia +61 2 9850 8269
| |
Collapse
|
2
|
Datta B, Paul D, Pal U, Rakshit T. Intriguing Biomedical Applications of Synthetic and Natural Cell-Derived Vesicles: A Comparative Overview. ACS APPLIED BIO MATERIALS 2021; 4:2863-2885. [PMID: 35014382 DOI: 10.1021/acsabm.0c01480] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The significant role of a vesicle is well recognized; however, only lately has the advancement in biomedical applications started to uncover their usefulness. Although the concept of vesicles originates from cell biology, it later transferred to chemistry and material science to develop nanoscale artificial vesicles for biomedical applications. Herein, we examine different synthetic and biological vesicles and their applications in the biomedical field in general. As our understanding of biological vesicles increases, more suitable biomimicking synthetic vesicles will be developed. The comparative discussion between synthetic and natural vesicles for biomedical applications is a relevant topic, and we envision this could enable the development of a proper approach to realize the next-generation treatment goals.
Collapse
Affiliation(s)
- Brateen Datta
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake City, Kolkata 700106, India
| | - Debashish Paul
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake City, Kolkata 700106, India
| | - Uttam Pal
- Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake City, Kolkata 700106, India
| | - Tatini Rakshit
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake City, Kolkata 700106, India
| |
Collapse
|
3
|
Schäfer H, Stahn R, Schreiber J. Glycoprotein Mediated Cell Binding of Lectin Coated Liposomes. J Liposome Res 2008. [DOI: 10.3109/08982109609031131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
4
|
Literature Alerts. J Microencapsul 2008. [DOI: 10.3109/02652048909098028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
5
|
Shao J, Ma JKH. Characterization of a mannosylphospholipid liposome system for drug targeting to alveolar macrophages. Drug Deliv 2008. [DOI: 10.3109/10717549709033187] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
6
|
Literature Alerts. J Microencapsul 2008. [DOI: 10.3109/02652048909019923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
7
|
Universal liposomes: preparation and usage for the detection of mRNA. Anal Bioanal Chem 2008; 391:1689-702. [DOI: 10.1007/s00216-008-1992-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Revised: 01/22/2008] [Accepted: 02/18/2008] [Indexed: 10/22/2022]
|
8
|
Suci PA, Berglund DL, Liepold L, Brumfield S, Pitts B, Davison W, Oltrogge L, Hoyt KO, Codd S, Stewart PS, Young M, Douglas T. High-density targeting of a viral multifunctional nanoplatform to a pathogenic, biofilm-forming bacterium. ACTA ACUST UNITED AC 2007; 14:387-98. [PMID: 17462574 DOI: 10.1016/j.chembiol.2007.02.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2006] [Revised: 01/10/2007] [Accepted: 02/07/2007] [Indexed: 11/22/2022]
Abstract
Nanomedicine directed at diagnosis and treatment of infections can benefit from innovations that have substantially increased the variety of available multifunctional nanoplatforms. Here, we targeted a spherical, icosahedral viral nanoplatform to a pathogenic, biofilm-forming bacterium, Staphylococcus aureus. Density of binding mediated through specific protein-ligand interactions exceeded the density expected for a planar, hexagonally close-packed array. A multifunctionalized viral protein cage was used to load imaging agents (fluorophore and MRI contrast agent) onto cells. The fluorescence-imaging capability allowed for direct observation of penetration of the nanoplatform into an S. aureus biofilm. These results demonstrate that multifunctional nanoplatforms based on protein cage architectures have significant potential as tools for both diagnosis and targeted treatment of recalcitrant bacterial infections.
Collapse
Affiliation(s)
- Peter A Suci
- Department of Microbiology, Center for BioInspired Nanomaterials, Montana State University, Bozeman, MT 59717, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Santos HMLR, de Queiroz FB, Maior RMS, do Nascimento SC, Magalhães NSS. Cytotoxicity of doxorubicin-loaded Con A-liposomes. Drug Dev Res 2006. [DOI: 10.1002/ddr.20091] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
10
|
Robinson AM, Creeth JE, Jones MN. The specificity and affinity of immunoliposome targeting to oral bacteria. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1369:278-86. [PMID: 9518649 DOI: 10.1016/s0005-2736(97)00231-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Immunoliposomes have been prepared using antibodies raised to an antigenic determinant on the cell surface of the oral bacterium Streptococcus oralis (S. oralis) in an investigation of their potential to reduce dental plaque. The N-succinimidyl-S-acetylthioacetate (SATA) derivative of the antibodies were conjugated through the reactive m-maleimidobenzoyl-N-hydroxysuccinimide (MBS) derivative of dipalmitoyl-phosphatidylethanolamine (DPPE) incorporated into liposomes. The degree of antibody conjugation to the liposomes was controlled by the percentage of DPPEMBS incorporated into the liposomes. The chemical modification of the antibodies did not affect the ability of the antibodies to bind to a S. oralis biofilm. However, the affinity of the immunoliposomes for S. oralis was much lower than that of the free antibody. The anti-oralis antibodies were highly specific for S. oralis. The anti-oralis immunoliposomes showed the greatest affinity for S. oralis, when targeted to a range of different oral bacterial biofilms. The immunoliposome targeting affinity for S. oralis was largely unaffected by the number of antibodies conjugated to the liposomal surface or by the net charge of the liposomal lipid bilayer. The immunoliposomes showed a greater affinity for S. oralis than 'naked' (bearing no antibody) liposomes. However, positively charged liposomes, incorporating stearylamine, adsorbed to S. oralis with greater affinities than the immunoliposomes. The immunoliposomes appeared to be physically stable over a period of 18 months, as judged by particle-size measurements.
Collapse
Affiliation(s)
- A M Robinson
- School of Biological Sciences, University of Manchester, Manchester M13 9PT, UK
| | | | | |
Collapse
|
11
|
|
12
|
|
13
|
Jones MN. The surface properties of phospholipid liposome systems and their characterisation. Adv Colloid Interface Sci 1995; 54:93-128. [PMID: 7832999 DOI: 10.1016/0001-8686(94)00223-y] [Citation(s) in RCA: 120] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The field of liposome (vesicle) research has expanded considerably over the last 30 years. In physical chemical terms liposomes have many of the characteristics of colloidal particles and their stability is determined in part by the classical surface forces. It is now possible to engineer a wide range of liposomes varying in size, phospholipid composition and surface characteristics. The surfaces of liposomes can be modified by the choice of bilayer lipid as well as by the incorporation and covalent linkage of proteins (e.g. antibodies and sugar binding proteins [lectins]), glycoproteins and synthetic polymers. Much of the impetus for liposome design has come from their potential value as drug delivery systems. The development of technologies for the production of such a range of liposome systems has presented interesting problems in the characterisation of their properties. The review addresses the progress that has been made in characterising the surfaces of different types of liposomes with specific reference to their electrophoretic properties and their interpretation and the physical interactions between liposomal bilayers.
Collapse
Affiliation(s)
- M N Jones
- School of Biological Sciences, University of Manchester, UK
| |
Collapse
|
14
|
|
15
|
Jones MN, Kaszuba M, Hill KJ, Song YH, Creeth JE. The use of phospholipid liposomes for targeting to oral and skin-associated bacteria. J Drug Target 1994; 2:381-9. [PMID: 7704482 DOI: 10.3109/10611869408996813] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Phospholipid (dipalmitoylphosphatidylcholine (DPPC) plus phosphatidylinositol (PI)) proteoliposomes with surface bound lectins (succinylated concanavalin A (s con A) and wheat germ agglutinin (WGA)) have been prepared covering a range of size and surface density of lectin. Negatively charged phospholipid liposomes from DPPC-PI mixtures covering a range of PI mole % and positively charged liposomes from DPPC-cholesterol-stearylamine (SA) mixtures covering a range of SA mole % have been prepared. The targeting of the liposomes and proteoliposomes to a range of oral and skin-associated been prepared. The targeting of the liposomes and proteoliposomes to a range of oral and skin-associated bacterial biofilms has been investigated. The oral bacteria Streptococcus mutans and gordonii and the skin-associated bacterium Coryneform hofmanni can be targeted with s con A bearing proteoliposomes while the skin associated bacterium Staphylococcus epidermidis can be targeted with WGA bearing proteoliposomes. Both oral and skin-associated bacteria can be targeted with positively charged liposomes although the extents of adsorption to the biofilm are low except for Staphylococcus epidermidis. In the case of negatively charged liposomes targeting is critically dependent on the PI content of the liposomes and for all the bacteria studied optimum levels PI for targeting have been found. The adsorption of the oral bacterium Streptococcus gordonii to immobilised monolayers having the optimum PI level for adsorption has been studied by total internal reflection microscopy (TIRM). Both the phospholipid and proteoliposomes have been used to deliver the bactericide Triclosan to biofilms. All the systems studied inhibited bacterial growth to varying degrees.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- M N Jones
- School of Biological Sciences, University of Manchester, U.K
| | | | | | | | | |
Collapse
|
16
|
Jones MN, Hudson MJ. The targeting of immunoliposomes to tumour cells (A431) and the effects of encapsulated methotrexate. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1152:231-42. [PMID: 8218324 DOI: 10.1016/0005-2736(93)90254-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Immunoliposomes have been prepared from lipid mixtures of dipalmitoylphosphatidylcholine, wheat germ phosphatidylinositol and a reactive lipid (the m-maleimidobenzoyl-N-hydroxysuccinimide derivative of dipalmitoylphosphatidylethanolamine) which was conjugated to the N-succinimidyl-S-acetylthioacetate (SATA) derivative of a monoclonal antibody (H17E2) raised to human placental alkaline phosphatase (PLAP). The immunoliposomes were prepared by the extrusion technique (VETs) and by reverse phase evaporation (REVs) and were found to effectively target to immobilised PLAP and to PLAP or PLAP-like enzyme on the surface of a tumour cell line (A431) using an ELISA and autoradiography. The extent of binding to immobilised PLAP was a function of immunoliposomal lipid concentration, the weight-average number of antibody molecules per liposome (Pw) and the liposome size. The effectiveness of methotrexate-loaded immunoliposomes in inhibiting the proliferation of A431 cells was investigated relative to equivalent levels of the free drug. The immunoliposomes prepared by the extrusion technique (VETs) inhibited growth of A431 cells but had no effect on the growth of a normal human fibroblastic cell line. Immunoliposomes prepared by reverse phase evaporation (REVs) were less effective in inhibiting A431 cell proliferation. The immunoliposomes probably enter the tumour cells largely by receptor-mediated endocytosis although other mechanisms of uptake cannot be excluded.
Collapse
Affiliation(s)
- M N Jones
- Department of Biochemistry and Molecular Biology, University of Manchester, UK
| | | |
Collapse
|
17
|
The preparation and characterisation of immunoliposomes with surface-bound placental alkaline phosphate antibody. Colloids Surf B Biointerfaces 1993. [DOI: 10.1016/0927-7765(93)80047-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
18
|
Jones MN, Francis SE, Hutchinson FJ, Handley PS, Lyle IG. Targeting and delivery of bactericide to adsorbed oral bacteria by use of proteoliposomes. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1147:251-61. [PMID: 8476919 DOI: 10.1016/0005-2736(93)90010-w] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Proteoliposomes having surface-bound succinylated concanavalin A (s-conA) have been prepared from a range of phospholipid mixtures by sonication (SUV) and reverse phase evaporation (REV) covering a range of size (weight-average diameter (dw)) from approx. 35 to 310 nm and weight-average number of protein molecules per liposomes (Pw) from approx. 50 to 3000. The targeting of the proteoliposomes to adsorbed biofilms of the bacteria Streptococcus sanguis and Streptococcus mutans has been assessed from the extent of inhibition of an enzyme-linked immunosorbent assay (ELISA) for bacterial cell surface antigens. The surface-bound lectin enhances targeting relative to 'naked' liposomes of comparable concentration by factors of 2-50 depending on the liposomal lipid composition and Pw. The effect of the bactericide Triclosan on the thermal properties and permeability characteristics of liposomes has been studied. At and above a molar ratio of Triclosan to lipid of 0.6, Triclosan eliminates the gel to liquid-crystalline phase transition in dipalmitoylphosphatidylcholine (DPPC) containing liposomes and increases the bilayer permeability of both liposomes and proteoliposomes to D-glucose. The proteoliposomes have been used to deliver Triclosan to S. sanguis biofilms and the inhibition of growth of the bacteria after treatment with liposomally delivered Triclosan has been determined using a microtitre plate re-growth assay and compared with growth inhibition by 'free' Triclosan. It is shown that for short exposure times (1 to 2 min) proteoliposomally delivered Triclosan is a more effective growth inhibitor than free Triclosan. The results are discussed in terms of the targeting, retention and subsequent release of Triclosan into the bacterial biofilms.
Collapse
Affiliation(s)
- M N Jones
- Department of Biochemistry and Molecular Biology, University of Manchester, UK
| | | | | | | | | |
Collapse
|
19
|
Uwiera RE, Romancyia DA, Wong JP, Forsyth GW. Effect of covalent modification on the binding of cholera toxin B subunit to ileal brush border surfaces. Anal Biochem 1992; 204:244-9. [PMID: 1443521 DOI: 10.1016/0003-2697(92)90234-x] [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: 12/27/2022]
Abstract
A competitive binding assay has been developed to determine how modifications to the B subunit of cholera toxin affect the binding affinity of the subunit for an ileal brush border membrane surface. The Ricinus communis120 agglutinin (RCA120) specifically binds to terminal beta-D-galactosyl residues such as those found in oligosaccharide side chains of glycoproteins and ganglioside GM1. Conditions were designed to produce binding competition between the B subunit of cholera toxin and the RCA120 agglutinin. Displacement of RCA120 from brush border surfaces was proportional to the concentration of B subunit added. This assay was used to study the effect of modification of B subunit on competitive binding affinity for the ileal brush border surface. The B subunit of cholera toxin was modified by coupling an average of five sulfhydryl groups to each B subunit molecule and by reaction of the SH-modified B subunit with liposomes containing a surface maleimide group attached to phosphatidylethanolamine. SH-modified B subunit was approximately 200-fold more effective than native B subunit in displacing lectin from brush border surfaces in the competitive binding assay. The enhanced binding activity was retained on covalent attachment of the modified B subunit to the liposome surface. We conclude that the B subunit of cholera toxin may be a useful targeting agent for directing liposomes to cell surfaces that contain a ganglioside GM1 ligand.
Collapse
Affiliation(s)
- R E Uwiera
- Veterinary Physiological Sciences, University of Saskatchewan, Saskatoon, Canada
| | | | | | | |
Collapse
|
20
|
|
21
|
Friede MH, von Holt C. Ricin B-chain promotes the internalisation of liposomal contents into rat hepatoma cells. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1069:273-80. [PMID: 1932067 DOI: 10.1016/0005-2736(91)90135-u] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Ricin B-chain covalently attached to liposomes has been shown to promote the binding of the liposomes to rat hepatoma cells through its galactosyl binding site. Internalisation of the bound liposomes is demonstrated by the cytotoxicity of methotrexate-containing liposomes, the transfection of cells with targeted liposomes containing pSV2-neo DNA and the intracellular activity of an enzyme encapsulated in liposomes targeted with the ricin B-chain.
Collapse
Affiliation(s)
- M H Friede
- FRD-UCT Research Centre for Molecular Biology, Department of Biochemistry, University of Cape Town, Rondebosch, South Africa
| | | |
Collapse
|
22
|
Francis SE, Lyle IG, Jones MN. The effect of surface-bound protein on the permeability of proteoliposomes. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1062:117-22. [PMID: 2004101 DOI: 10.1016/0005-2736(91)90382-i] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Proteoliposomes have been prepared from mixtures of dipalmitoylphosphatidylcholine and phosphatidylinositol by sonication (SUV) and reverse phase evaporation (REV) and conjugated with succinyl concanavalin A (sConA). The proteoliposomes were characterised in terms of size and composition and covered a range of size (weight-average diameter) from approx. 80 to 300 nm and surface-bound sConA (weight-average number of protein molecules per liposome) from approx. 200 to 1800. The permeabilities of the proteoliposomes to encapsulated D-glucose have been measured and found to increase linearly with protein conjugation. The D-glucose permeability also increases with temperature and passes through a maximum in the region of the gel to liquid-crystalline phase transition temperature. Conjugation has no effect on the chain-melting temperature but slightly decreases the enthalpy of the transition consistent with the withdrawal of some phospholipid participation in chain-melting. The D-glucose permeabilities and thermotropic properties of the proteoliposomes are discussed in terms of the dislocation of the bilayer by the possible off-axis motion of the lipid which anchors the protein to the liposomal surface.
Collapse
Affiliation(s)
- S E Francis
- Department of Biochemistry and Molecular Biology, University of Manchester, U.K
| | | | | |
Collapse
|
23
|
Reboiras M, Morris G, Jones M. The polymerisation of methacryloyl surfactant vesicles by Fenton's reagent and their characterisation and stability to alcohol and detergents. ACTA ACUST UNITED AC 1990. [DOI: 10.1016/0166-6622(90)80119-o] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
24
|
The integrity of proteoliposomes adsorbed on a biosurface. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 1989. [DOI: 10.1016/0005-2736(89)90547-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
25
|
Hutchinson FJ, Francis SE, Lyle IG, Jones MN. The characterisation of liposomes with covalently attached proteins. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 978:17-24. [PMID: 2914128 DOI: 10.1016/0005-2736(89)90492-6] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The problem of characterising liposomes with covalently attached proteins has been analysed theoretically in terms of a normal weight distribution of liposome diameters. The polydispersity of protein conjugation is considered in terms of the width (standard deviation) of the liposome size distribution. It is shown that the weight-average number of proteins per liposome is a convenient parameter to use to define the protein content of proteoliposomes. Two types of proteoliposome have been prepared (small unilamellar vesicles and reverse phase evaporation vesicles) in which wheat germ agglutinin is covalently coupled to the liposomal surface. The liposomes cover a range of weight average diameter from 65 to 240 nm and of polydispersity (weight to number average diameter (dw/dn) from 2.6 to 11.4. The liposomes have been characterised by chemical analysis and photon correlation spectroscopy and the results are discussed in terms of the theoretical consequences of an equivalent normal weight distribution of diameters.
Collapse
Affiliation(s)
- F J Hutchinson
- Department of Biochemistry & Molecular Biology, University of Manchester, U.K
| | | | | | | |
Collapse
|