132153-84-5Relevant academic research and scientific papers
Facile in situ preparation of biologically active multivalent glyconanoparticles
Spain, Sebastian G.,Albertin, Luca,Cameron, Neil R.
, p. 4198 - 4200 (2006)
Biologically active multivalent glyconanoparticles are prepared in an extremely simple method by reduction of well-defined glycopolymers, prepared by RAFT polymerisation, in an aqueous solution of HAuCl4. The Royal Society of Chemistry 2006.
Enzymatic synthesis and polymerisation of β-mannosyl acrylates produced from renewable hemicellulosic glycans
Rosengren, Anna,Butler, Samuel J.,Arcos-Hernandez, Monica,Bergquist, Karl-Erik,Jannasch, Patric,St?lbrand, Henrik
, p. 2104 - 2118 (2019)
We show that glycoside hydrolases can catalyse the synthesis of glycosyl acrylate monomers using renewable hemicellulose as a glycosyl donor, and we also demonstrate the preparation of novel glycopolymers by radical polymerisation of these monomers. For this, two family 5 β-mannanases (TrMan5A from Trichoderma reesei and AnMan5B from Aspergillus niger) were evaluated for their transglycosylation capacity using 2-hydroxyethyl methacrylate (HEMA) as a glycosyl acceptor. Both enzymes catalysed conjugation between manno-oligosaccharides and HEMA, as analysed using MALDI-ToF mass spectrometry (MS) as an initial product screening method. The two enzymes gave different product profiles (glycosyl donor length) with HEMA, and with allyl alcohol as acceptor molecules. AnMan5A appeared to prefer saccharide acceptors with lower intensity MS peaks detected for the desired allyl and HEMA conjugates. In contrast to AnMan5A, TrMan5A showed pronounced MS peaks for HEMA-saccharide conjugation products. TrMan5A was shown to catalyse the synthesis of β-mannosyl acrylates using locust bean gum galactomannan or softwood hemicellulose (acetyl-galactoglucomannan) as a donor substrate. Evaluation of reaction conditions using galactomannan as a donor, HEMA as an acceptor and TrMan5A as an enzyme catalyst was followed by the enzymatic production and preparative liquid chromatography purification of 2-(β-manno(oligo)syloxy) ethyl methacrylates (mannosyl-EMA and mannobiosyl-EMA). The chemical structures and radical polymerisations of these novel monomers were determined using 1H and 13C NMR spectroscopy and size-exclusion chromatography. The two new water soluble polymers have a polyacrylate backbone with one or two pendant mannosyl groups per monomeric EMA unit, respectively. These novel glycopolymers may show properties suitable for various technical and biomedical applications responding to the current demand for functional greener materials to replace fossil based ones.
Chemo-enzymatic synthesis route to poly(glucosyl-acrylates) using glucosidase from almonds
Kloosterman, Wouter M. J.,Roest, Steven,Priatna, Siti R.,Stavila, Erythrina,Loos, Katja
, p. 1837 - 1846 (2014)
Novel types of glucosyl-acrylate monomers are obtained by β-glucosidase from almond catalyzed glycosidation reaction. The saccharide-acrylate monomers were synthesized by reaction of d-glucose with hydroxyl functional acrylates: 2-hydroxyethyl acrylate (2
Investigation of the interaction between peanut agglutinin and synthetic glycopolymeric multivalent ligands
Ambrosi, Moira,Cameron, Neil R.,Davis, Benjamin G.,Stolnik, Snjezana
, p. 1476 - 1480 (2005)
The interaction between synthetic glycoplymers bearing β-D-galactose side groups and the lectin peanut agglutinin (PNA) was investigated by UV-difference spectroscopy and isothermal titration calorimetry (ITC). UV-difference spectroscopy indicated that the polymer-lectin interaction was stronger than that between PNA and either the corresponding monomer, D-galactose or D-lactose. The thermodynamics of binding (K, ΔG, ΔH, ΔS and n) were determined from ITC data by fitting with a two-site, non-cooperative binding model. It was found that the glycopolymer displayed around a 50 times greater affinity for the lectin than the parent carbohydrate, and around 10 times greater than the monomer, on a valency-corrected basis. Binding was found to be entropically driven, and was accompanied by aggregation and precipitation of protein molecules. Furthermore, interesting differences between polymers prepared either from deacetylated monomers, or by deacetylation of pre-formed polymers, were found. The Royal Society of Chemistry 2005.
Enzymatic Synthesis of 2-(β-Galactosyl)-ethyl Methacrylate by β-Galactosidase from Pyrococcus woesei and Application for Glycopolymer Synthesis and Lectin Studies
Hoffmann, Marius,Gau, Elisabeth,Braun, Susanne,Pich, Andrij,Elling, Lothar
, p. 974 - 987 (2020/03/03)
Glycosidases have long been used for the synthesis of glycosides by transglycosylation reactions. Especially glycosidases from hyperthermophilic bacteria are useful for reactions under extreme reaction conditions, e.g., in the presence of organic solvents. We herein report the facile enzymatic synthesis and purification of 2-(β-galactosyl)-ethyl methacrylate (Gal-EMA) with the recombinant hyperthermostable glycosidase from Pyrococcus woesei in high yields. Optimized reaction conditions resulted in gram-scale synthesis of the galactosylated monomer with 88% transglycosylation yield. The product Gal-EMA was characterized by high-performance liquid chromatography-electrospray ionization-mass spectrometry (HPLC-ESI-MS), nuclear magnetic resonance (NMR) spectroscopy, and infrared (IR) spectroscopy. Gal-EMA was utilized to synthesize sugar-functionalized acrylate polymers with defined amounts of incorporated galactose (0-100%). Analysis of the binding affinity of the lectin RCA120 from Ricinus communis to the glycopolymers using an enzyme-linked lectin assay (ELLA) revealed KD values between 0.24 and 6.2 nM, depending on the amount of incorporated Gal-EMA. The potential of Gal-EMA for the synthesis of acrylate-functionalized glycan oligomers was demonstrated by sequential elongation of the terminal galactose by two glycosyltransferases, resulting in the terminal glycan N-acetyllactosamine (LacNAc) epitope. In conclusion, the enzymatic synthesis of Gal-EMA opens new routes to a series of novel monomeric building blocks for the synthesis of glycan-functionalized polyacrylates.
Glycopolymer-Grafted Nanoparticles: Synthesis Using RAFT Polymerization and Binding Study with Lectin
Kutcherlapati, S. N. Raju,Koyilapu, Rambabu,Boddu, Uma Maheswara Rao,Datta, Debparna,Perali, Ramu Sridhar,Swamy, Musti J.,Jana, Tushar
, p. 7309 - 7320 (2017/10/03)
The weak binding between carbohydrates and proteins is a major constraint toward the development of carbohydrate-based therapeutics. To address this, here we report the synthesis of glycopolymer (GP)-grafted silica nanoparticles (SiNP) by using reversible addition-fragmentation chain transfer (RAFT) polymerization through the grafting-from approach using a multistep process. GP chains of various lengths with controlled molecular weight and narrow polydispersities were grown on the RAFT agent anchored SiNP surface using mannosyloxyethyl methacrylate (MEMA) as a glycomonomer. Spectroscopic (FT-IR, NMR) and thermogravimetric studies confirmed the grafting of poly(MEMA) chains on the SiNP surface and also showed that the dry DMF is a better solvent as compared to water/ethanol mixture for carrying out the MEMA polymerization on SiNP surface. The mean diameter of the dry GP-grafted SiNPs (GP-g-SiNPs) obtained from microscopic studies was in the range 50-60 nm, whereas the hydrodynamic diameter as obtained using light scattering measurements varied between 90 and 165 nm depending on the chain length of poly(MEMA). Hydrolysis of silica cores using aqueous HF enabled characterization of cleaved polymer using GPC, and the obtained unimodal chromatogram and narrow PDI confirmed that the polymerization proceeded through the RAFT mechanism. GP-g-SiNPs displayed stronger binding to the mannose specific lectin, Concanavalin A, owing to the larger positive binding entropic contribution which resulted in an association constant that is 800- and 400-fold stronger than that of monomeric mannose and GP chains, respectively.
CARBOHYDRATE-BASED COMPOSITIONS AND METHODS FOR TARGETED DRUG DELIVERY
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, (2014/09/03)
Provided herein are compositions and methods for intracellular delivery. The compositions are polymer compositions in which the polymer serves as a carrier for therapeutic and/or diagnostic agents. The polymer compositions are effective in targeted delivery of therapeutic and/or diagnostic agents to a cell. The polymer compositions include a targeting moiety that includes carbohydrate groups that effectively target specific cell surface receptors. The polymer compositions also include an agent binding moiety that effectively associates the therapeutic and/or diagnostic agent to be delivered to the cell.
Glycosylation using unprotected alkynyl donors
Mamidyala, Sreeman K.,Finn
experimental part, p. 8417 - 8420 (2010/01/16)
(Chemical Equation Presented) Gold(III) activation of unprotected propargyl glycosyl donors has been shown to be effective for the synthesis of saccharides. Terminal propargyl glycosides of glucose, galactose, and mannose required heating at reflux in ace
Influence of preparation procedure on polymer composition: Synthesis and characterisation of polymethacrylates bearing β-D-glucopyranoside and β-D-galactopyranoside residues
Ambrosi, Moira,Batsanov, Andrei S.,Cameron, Neil R.,Davis, Benjamin G.,Howard, Judith A.K.,Hunter, Rob
, p. 45 - 52 (2007/10/03)
Methacrylate derivatives bearing β-D-glucopyranoside and β-D-galactopyranoside residues are synthesised by glycosylation of 2-hydroxyethyl methacrylate (HEMA) with 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide and 2,3,4,6-tetra-O-acetyl-α-D-galactopyranosyl bromide, respectively. β-Selectivity in the glycosylation reactions is ensured by neighbouring-group participation of acetyl groups at O-2 in the glycosyl donors. 2-(2′,3′,4′,6′-tetraO-acetyl-β-D-glucosyloxy)ethyt methacrylate (AcGlcEMA, 1 a) was obtained as a crystalline solid and its crystal structure was determined by single-crystal X-ray diffraction. Deprotected polymers are synthesised in two parallel ways; either polymerisation of the protected monomers and subsequent deacetylation of the resulting polymers, or polymerisation of the previously deprotected monomers. The number- and weight-average relative molecular masses of both the protected and deprotected polymers are determined by size exclusion chromatography (SEC). Absolute molecular masses are obtained using the previously estimated refractive-index increments, dn/dc. It is found that polymerisation of deprotected monomers leads to polymers of well-defined composition, in contrast to the deacetylation of protected polymers.
Glycoside derivatives, polymers containing glycoside derivatives, process for their preparation and use of said polymers
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, (2008/06/13)
The present invention provides a glycoside derivative represented by the formula STR1 wherein G--O-- is a saccharide residue having no protective group, R is a hydrogen atom or a methyl group, m is 1 or 2, n is an integer of 1 to 4, and l is an integer of 1 or more provided that l≤n; a polymer containing the glycoside derivative; a process for their preparation, and the use of the polymers.
