US20090318372A1 - Method For Producing 2-O-Glyceryl-Alpha-D-Glucopyranoside - Google Patents

Method For Producing 2-O-Glyceryl-Alpha-D-Glucopyranoside Download PDF

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US20090318372A1
US20090318372A1 US12/442,288 US44228807A US2009318372A1 US 20090318372 A1 US20090318372 A1 US 20090318372A1 US 44228807 A US44228807 A US 44228807A US 2009318372 A1 US2009318372 A1 US 2009318372A1
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glucosylglycerol
sucrose
αgg
glucosyl
spase
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Christiane Gödl
Thornthan Sawangwan
Bernd Nidetzky
Mario Müller
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Technische Universitaet Graz
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Technische Universitaet Graz
Forschungsholding TU Graz GmbH
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P19/00—Preparation of compounds containing saccharide radicals
    • C12P19/44—Preparation of O-glycosides, e.g. glucosides
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
    • A23L27/30—Artificial sweetening agents
    • A23L27/33—Artificial sweetening agents containing sugars or derivatives
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7028—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages
    • A61K31/7032—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a polyol, i.e. compounds having two or more free or esterified hydroxy groups, including the hydroxy group involved in the glycosidic linkage, e.g. monoglucosyldiacylglycerides, lactobionic acid, gangliosides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/60—Sugars; Derivatives thereof
    • A61K8/602—Glycosides, e.g. rutin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • A61Q19/10—Washing or bathing preparations

Definitions

  • the present invention relates to methods for producing ⁇ -D-glucosylglycerol (2-O-glyceryl- ⁇ -D-glucopyranoside).
  • GTs Glycosyl-transferases
  • GHs glycosylhydrolases
  • GPs glycoside phosphorylases
  • GPs catalyze the phosphorolysis of ⁇ - and ⁇ -D-glycosides, mainly glucosides (Glc-OR) including disaccharides and oligo- or poly-saccharides of varying degree of polymerisation.
  • Glucosyl transfer to phosphate (Pi) is favoured thermodynamically in vivo because phosphate is usually present in large excess over ⁇ -D-glucose 1-phosphate (Glc 1-P).
  • thermodynamic equilibrium constants (K eq ) of GP-catalysed reactions are intermediate of K eq values for the reaction of GTs (K eq ⁇ 1) and GHs (K eq >>1).
  • ⁇ GG ⁇ -D-glucosylglycerol (2-O-gly-ceryl- ⁇ -D-glucopyranoside; ⁇ GG) for which several applications are presently being developed.
  • ⁇ GG functions as a compatible solute in microorganisms, providing some protection against stresses due to high salt concentrations, heat, and UV-radiation.
  • ⁇ GG is purportedly useful as an alternative sweetener in food stuffs because of its low cariogenicity and caloric value in comparison to sucrose.
  • ⁇ GG and derivates thereof are studied as therapeutics in diseases caused by protein misfolding and in cancer therapy.
  • ⁇ GG may be used as an anti-aging agent and moisture-regulating compound.
  • ⁇ GG can be produced by chemical as well as by enzymatic methods. Chemical methods may involve various start compounds like maltitol, isomaltose, trehalulose etc. (see e.g. Takenaka F. et al. Biosci. Biotechnol. Biochem. (2000) 64:378-385). Enzymes which catalyze the synthesis of ⁇ GG may involve ⁇ -glucosi-dase (Takenaka F. and Uchiyama H. Biosci. Biotechnol. Biochem. (2000) 64:1821-1826), cyclodextrin glucanotransferase (Nakano H. et al. J. Biosci. Bioeng.
  • JP 2001/245690 A relates to a method for producing glycosides and oligosaccharides by using a glucosidase, in particular ⁇ -galactosidase.
  • the present invention relates to a method for producing 2-O-glyceryl- ⁇ -D-glucopyranoside ( ⁇ GG; FIG. 1 ) from a glucosyl donor and a glucosyl acceptor comprising the steps:
  • SPase Sucrose phosphorylase
  • EC 2.4.1.7 Sucrose phosphorylase
  • SPase has been isolated from a number of bacterial sources. Genes encoding SPase have been cloned from different bacteria and expressed heterologously (Kawasaki H et al., Biosci. Biotech. Biochem. (1996) 60:322-324; Kitao S and Nakano E, J. Ferment. Bioeng. (1992) 73:179-184; van den Broek L A M et al., Appl. Microbiol. Biotechnol. (2004) 65:219-227).
  • GH glycosylhydrolases
  • GT glycosyltransferases
  • the reaction of SPase proceeds with net retention of the anomeric configuration and occurs through a double displacement mechanism involving two configurationally inverting steps: cleavage of the carbon-oxygen bond of the glucosyl donor and formation of a covalent ⁇ -glucosyl-enzyme ( ⁇ -Glc-E) intermediate; and reaction of the intermediate with phosphate to yield Glc 1-P.
  • ⁇ -Glc-E covalent ⁇ -glucosyl-enzyme
  • the ⁇ -Glc-E intermediate may be intercepted by water, leading to hydrolysis.
  • Hydrolytic conversion of sucrose is irreversible but proceeds nearly two orders of magnitude slower than the phosphorolytic reaction.
  • SPase also catalyzes transglucosylation reactions which occur in competition with hydrolysis and whereby the ⁇ -Glc-E intermediate is attacked by external nucleophiles and new ⁇ -D-glucosides are produced.
  • SPase is strictly specific for transferring a glucosyl moiety and does not tolerate structural modifications on the glucopyranosyl ring including epimerisation and deoxygenation.
  • the list of known glucosyl donors for SPase is therefore short: sucrose, Glc 1-P and ⁇ -D-glucose 1-fluoride.
  • sucrose, Glc 1-P and ⁇ -D-glucose 1-fluoride sucrose, Glc 1-P and ⁇ -D-glucose 1-fluoride.
  • the specificity of SPase for glucosyl acceptors is comparably relaxed.
  • the selectivity of SPase which forms only natural ⁇ GG in a high quantitative yield (>95%) are crucial points of the method according to the present invention.
  • the method of the present invention may use very cheap substrates (which are both available from large-scale industrial processing) without any chemical derivatisation (required in chemical synthesis) and is characterized by an extremely high atom efficiency because all substrate converted goes quantitatively into product.
  • substrates which are both available from large-scale industrial processing
  • chemical derivatisation reactive in chemical synthesis
  • all substrate converted goes quantitatively into product.
  • most of the substrate is used for growth and maintenance energy and only a small part of it is used for ⁇ GG production.
  • only one enzyme is required and this may be of natural or recombinant preparation, used as free or immobilized, as isolated enzyme or in another catalyst form (permeabilized or resting cells).
  • the method of the present invention is preferably performed in vitro with purified enzyme or an enzyme extract, whereby the SPase employed may be obtained from at least one source, which means that also SPases of more than one type (origin) may be employed.
  • Synthesis of ⁇ GG is preferably performed using a protein concentration of sucrose phosphorylase delivering an activity of between 1,000 and 1,000,000 units/litre (one unit is defined as the enzyme activity that converts 1 ⁇ mol of substrate per min under standard reaction conditions, typically 30° C., reported in the literature.)
  • “Sucrose phosphorylase” as used herein refers not only to enzymes of the EC 2.4.1.7 class but also to molecules which exhibit the same properties in relation to its substrates and products. Such molecules include also fusion proteins of sucrose phosphorylase with other peptides, polypeptides or proteins, which exhibit potentially also enzymatic or binding activities.
  • the glucosyl donor is selected from the group consisting of sucrose and analogues of sucrose in which the fructosyl moiety has been modified or substituted by another ketosyl residue, Glc 1-P, ⁇ -D-glucose-1-fluoride, further stable, activated glucosyl donors such as ⁇ -D-glucose-1-azide, and mixtures thereof.
  • the glucosyl donor to be employed in the method of the present invention can be any one which serves as substrate for the transglycosylation reaction catalysed by the SPase.
  • sucrose a disaccharide consisting of glucose and fructose
  • substrates like Glc 1-P or ⁇ -D-glucose-1-fluoride are employed, phosphate or fluoride will be products formed in addition to ⁇ GG.
  • achievable yield will depend on the energy content of the glucosyl donor and is greater than 30%, preferably greater than 50%, and in particular greater than 90%.
  • the sucrose phosphorylase used in a method according to the present invention is preferably of microbial, preferably bacterial origin.
  • microbial SPases The advantage of using microbial SPases is the simple production and isolation and stability of these enzymes. They can be obtained from microorganisms naturally or recombinantly expressing SPase.
  • the bacterial sucrose phosphorylase is obtained from Agrobacterium vitis (NCBI P33910), Bifidobacterium adolescentis (Q84HQ2), Bifidobacterium longum (Q84BY1), Escherichia coli (P76041), Escherichia coli O6 (Q8FHS2), Lactobacillus acidophilus (Q7WWP8, Q7WWQ5), Lactobacillus delbrueckii subsp.
  • Agrobacterium vitis NCBI P33910
  • Bifidobacterium adolescentis Q84HQ2
  • Bifidobacterium longum Q84BY1
  • Escherichia coli P76041
  • Escherichia coli O6 Q8FHS2
  • Lactobacillus acidophilus Q7WWP8, Q7WWQ5
  • Lactobacillus delbrueckii subsp Lactobacillus delbrueck
  • lactis (Q71I99), Leuconostoc mesenteroides (Q59495, Q9R5Q3), Listeria monocytogenes (Q4ENE7, Q4EQR2, Q4ETN7, Q4EHAO, Q4EJW2, Q4ELY7), Pseudomonas putrefaciens, Pseudomonas saccharophila (AAD40317), Rhodopirellula baltica (Q7UIS9), Shewanella baltica (Q3Q4P1), Shewanella frigidimarina (Q3NMD1), Solibacter usitatus (Q43TL5), Streptococcus mutans (P10249) and/or Synechococcus sp. (O68858, Q7U3J7).
  • At least one SPase derived from Leuconostoc mesenteroides is particularly preferred.
  • the SPase is preferably recombinantly produced as a full-length protein or a catalytically active fragment thereof or a fusion protein.
  • SPase directly from the organism which naturally produces said SPase.
  • Methods for the recombinant production of SPase are known to the person skilled in the art (e.g. Sambrook J. et al. Molecular cloning: a laboratory manual. ISBN 0-87969-309-6).
  • full-length protein refers to SPase encoded by a gene derived from an organism as, for instance, listed above. Said naturally occurring gene, in particular the SPase encoding region of said gene, is directly employed for the recombinant production of SPase.
  • a catalytically active fragment of SPase refers to protein fragments of SPase which have the same or substantially the same activity and substrate specificity as native SPase.
  • the length of the fragments is not crucial provided that the fragments will have the same or similar substrate specificity and catalyse the formation of the same products as native SPase.
  • a fusion protein refers to SPase or catalytically active fragments thereof recombinantly fused to at least one further protein, polypeptide or peptide.
  • Said at least one further protein, polypeptide or peptide may be of any kind (e.g. enzyme).
  • variants i.e. mutations including deletions, substitutions and insertions
  • these variants have the same or substantially the same (e.g. increased catalytical activity) activity as native SPase.
  • the SPase may be employed in the incubation step as either a cell-free enzyme, which may but need not be partially purified, a whole-cell system pre-treated physically or chemically for improved permeability of the cell membrane (permeabilisation) and mechanical stability, encapsulated catalyst in which said free enzyme or whole-cell system are entrapped, preferably in gel-like structures, or immobilized on a carrier.
  • a cell-free enzyme which may but need not be partially purified
  • the SPase is immobilised on a carrier which preferably is a solid support.
  • a carrier which preferably is a solid support.
  • the carrier is preferably a chromatography resin, preferably selected from the group consisting of anion exchange chromatography resin, cation exchange chromatography resin, affinity chromatography resin (e.g. comprising immobilised SPase specific antibodies) and hydrophobic interaction chromatography resin.
  • a chromatography resin preferably selected from the group consisting of anion exchange chromatography resin, cation exchange chromatography resin, affinity chromatography resin (e.g. comprising immobilised SPase specific antibodies) and hydrophobic interaction chromatography resin.
  • the SPase of the present invention may be immobilised (temporarily or covalently) on any carrier, preferably particles (e.g. beads), in particular chromatography resin, provided that the enzymatic activity of the enzyme is not affected in a way to change its substrate specificity or to reduce its activity to low conversion rates.
  • any carrier preferably particles (e.g. beads), in particular chromatography resin, provided that the enzymatic activity of the enzyme is not affected in a way to change its substrate specificity or to reduce its activity to low conversion rates.
  • the carrier may comprise functional groups which require—in order to bind the SPase on the resin—that also the enzyme carries corresponding binding partners (e.g. streptavidin—bi-otin, chelated metal ions—His 6 -tag).
  • functional groups which require—in order to bind the SPase on the resin—that also the enzyme carries corresponding binding partners (e.g. streptavidin—bi-otin, chelated metal ions—His 6 -tag).
  • SPase may be recombinantly produced as a fusion protein harboring a binding peptide, preferably one showing ion-exchange properties, or a binding domain, preferably a polysaccharide binding domain, in particular a cellulose binding domain.
  • insoluble immobilized enzymes carrier-bound, encapsulated, whole-cell systems
  • the immobilization of enzymes can be performed using a variety of techniques, including: (1) binding of the enzyme to a carrier or support, via covalent attachment, physical adsorption, electrostatic binding, or affinity binding, (2) crosslinking with bifunctional or multifunctional reagents, (3) entrapment in gel matrices, polymers, emulsions, or some form of membrane, and (4) a combination of any of these methods.
  • Detailed descriptions of many of these methods of enzyme immobilization, and the various factors affecting the choice of a method of immobilization, are collected in the following volumes of Methods in Enzymology, K. Mosbach (ed.), Academic Press, New York: Vol. 44 (1976), Vol. 135 (1987), Vol. 136 (1987), Vol. 137 (1988), and the references therein.
  • the immobilized SPase used in the reaction should be present in an effective concentration, usually a concentration of about 0.001 to about 100.0 IU/ml, preferably about 10 to about 50 IU/ml.
  • An IU International Unit is defined as the amount of enzyme that will catalyze the transformation of one micromole of substrate per minute.
  • the SPase bound to a carrier may be removed by filtration or centrifugation. If the immobilized SPase is packed in a column (e.g. chromatographic column) the production of ⁇ GG can be achieved in a continuous way without the necessity of removing the immobilized SPase from the reaction mixture.
  • a column e.g. chromatographic column
  • the incubation of the SPase with the substrates is performed at a pH value of 4 to 10, preferably of 5 to 9, more preferably of 6 to 8, in particular of 7.
  • the pH value in the method according to the present invention is preferably selected from the ranges identified above, which allows an efficient conversion of the substrates into ⁇ GG.
  • the incubation is performed for at least 15 min, preferably for at least 60 min, more preferably for at least 3 hours, even more preferably for at least 5 hours.
  • the incubation of the substrates with the immobilised or unbound SPase may be performed for at least 15 minutes. However it is especially preferred to select the incubation time between 1 and 48 or between 5 and 24 hours.
  • the incubation time depends also on the incubation temperature chosen. This means if the incubation temperature is below the optimal temperature of the enzyme the incubation time may be extended.
  • the incubation is performed at a temperature range of 10 to 50° C., preferably of 15 to 40° C., more preferably at a temperature of 30° C.
  • the mixture which according to the present invention is incubated with the SPase comprises the glucosyl donor, in particular sucrose, in a concentration of 0.01 to 3 mol/l, preferably of 0.05 to 2 mol/l, more preferably of 0.1 to 1.5 mol/l.
  • the substrate mixture comprises glycerol in a concentration of 0.01 to 10 mol/l, preferably of 0.05 to 5 mol/l, more preferably of 0.1 to 3 mol/l, even more preferably of 0.1 to 1.5 mol/l.
  • the ratio of glycerol to glucosyl donor in the mixture ranges preferably from 0.1:1 to 10:1, preferably from 0.5:1 to 5:1, more preferably from 1:1 to 3:1.
  • the ⁇ GG ⁇ -D-glucosylglycerol obtainable by the method according to the present invention can be isolated by different chromatographic methods, preferably by elution chromatography on activated charcoal combined with celite as a filter aid.
  • the product mixture obtainable by the method according to the present invention is loaded on a column of said material equilibrated in water, and elution of bound ⁇ GG is achieved with 2% ethanol.
  • Fractions containing ⁇ GG are free of residual glycerol and product resulting from cleavage of glucosyl donor.
  • the ⁇ GG is obtained in a yield of greater 70%, preferably greater 80%, in particular greater 90%.
  • the purity of the product after chromatography is greater 80%, preferably greater 90%, in particular greater 95%.
  • solid ⁇ GG is preferably obtained by drying, preferably by lyophilisation.
  • Charcoal may preferably be used as suspension or more preferably packed in a column (e.g. chromatographic column).
  • the reaction mixture potentially comprising the enzyme or residual enzyme and substrate is contacted with the charcoal (e.g. applied on a charcoal column) and successively eluted.
  • This eluate or even the reaction mixture itself can be (further) purified using an ion exchange resin, for instance.
  • the sucrose phosphorylase is obtained from Leuconostoc mesenteroides (Q59495, Q9R5Q3) and used as free or preferably immobilised enzyme preparation, preferably immobilised on an acrylic polymer, in particular a copolymer of methacrylamide, N,N′-methylen-bis(acrylamide) and a polymer carrying oxirane groups, wherein the immobilised sucrose phosphorylase is incubated with sucrose as glucosyl donor.
  • Another aspect of the present invention relates to ⁇ -D-gluc-osylglycerol ( ⁇ GG) or a product comprising ⁇ -D-glucosylglycerol ( ⁇ GG) obtainable by a method according to the present invention.
  • the ⁇ GG or the product comprising ⁇ GG which may be obtained by the method of the present invention, comprises the natural occurring ⁇ GG (2-O-glyceryl- ⁇ -D-glucopyranoside) in high amounts because SPase is able to specifically catalyze the formation of said ⁇ GG without significant formation of by-products resulting from transglucosylation. It is therefore of particular importance that no regioisomer mixture is contained in addition to the desired 2-O-glyceryl- ⁇ -D-glucopyranoside also 1-O-glyceryl- ⁇ -D-glucopyranoside. Separation of these two products would be exceedingly difficult.
  • hydrolysis product is prevented efficiently such that more than 90%, preferably more than 95%, more preferably more than 98% of the glucosyl moiety of the converted donor is transferred into the desired product.
  • sucrose is used as glucosyl donor a product comprising natural ⁇ GG and fructose is obtained.
  • Glc 1-P is used as glucosyl donor a product comprising natural ⁇ GG and phosphate is obtained.
  • a product obtainable by the method of the present invention may further comprise fructose, preferably in an equimolar amount to ⁇ GG ⁇ -D-glucosylglycerol.
  • ⁇ GG is a naturally occurring molecule (a glycoside; a carbohydrate derivative) which serves the function of an osmoprotective substance and stabilizer in various microorganisms.
  • ⁇ GG Several publications have shown that isolated ⁇ GG has a range of out-standing properties which are of substantial interest for technological application. Uses of ⁇ GG and derivatives thereof include but are not limited to the fields of medicine (cancer therapy), cosmetics (moisturizing and stabilizing additive to a range of products), and food products (antidiabetics).
  • ⁇ GG is a very efficient stabilizer of biomolecules (proteins, lipids) and microorganisms.
  • Another aspect of the present invention relates to a cosmetic preparation comprising ⁇ GG according to the present invention.
  • the cosmetic products of the present invention are especially characterised by the fact that they only comprise natural ⁇ GG, which may be obtained by the method of the present invention.
  • Another aspect of the present invention relates to a pharmaceutical preparation comprising ⁇ GG according to the present invention.
  • Another aspect of the present invention relates to a food supplement comprising ⁇ GG or a product comprising ⁇ GG according to the present invention.
  • Another aspect of the present invention relates to the use of ⁇ GG or product comprising ⁇ GG according to the present invention as sweetener.
  • a particular aspect is the use as sweetener of mixtures of ⁇ GG and fructose obtainable by the method of the present invention.
  • ⁇ GG can serve as a stabilizer of living microorganisms, proteins and lipid-derived structures. It can stabilize protein preparations, for example without being restricted thereto, antibodies, antibody fragments, and enzymes, against denaturation and loss of biological activity.
  • Another aspect of the present invention relates to the use of ⁇ GG as an additive that can facilitate protein folding, in particular that of recombinant proteins, under conditions in vitro as well as in vivo.
  • ⁇ GG may be in particular used as skin cleanser (JP 2004/331583), water-based cosmetic (JP 2004/331582), accumulation inhibitor of neutral fat (JP 2004/331580), production promoter of corium matrix (JP 2004/331579), cell activator (JP 2004/331578) and antibacterial agent (JP 2004/331577).
  • FIG. 1 shows the chemical structure of ⁇ GG.
  • Table 1 shows NMR data for ⁇ GG produced and purified according to the method of the present invention and demonstrate unequivocally the chemical structure in FIG. 1 .
  • FIG. 2 shows the production of ⁇ GG from sucrose and glycerol using free SPase from Leuconostoc mesenteroides.
  • the enzymatic reaction was performed in a stirred batch system.
  • a 50 mM MES buffer (pH 7) was used which contained 300 mM sucrose and 2 M glycerol as the substrates.
  • the enzyme concentration was 20 IU/ml.
  • the reaction mixture containing 300 mM sucrose, 2 M glycerol and 20 IU/ml SPase in 50 mM MES buffer (pH 7), was incubated at 30° C. and 550 rpm for 7.5 hr. Under these optimum conditions selected, the yield of ⁇ GG was higher than 95%.
  • the amount of released glucose was subtracted from the amount of released fructose to define the product.
  • FIG. 3 shows the operational stability of SPase from Leuconostoc mesenteroides immobilized on a polymer carrying oxirane groups. Results of continuous conversion of sucrose in a packed bed enzyme reactor are shown.
  • the substrate solution contained 600 mM of each, sucrose and phosphate, in 20 mM MES buffer, pH 7.0.
  • the reaction was carried out at 30° C. and a constant flow rate of 6 ml ⁇ h ⁇ 1, corresponding to an average residence time of 8.8 h (53 ml, ⁇ ) and 18.5 h (111 ml, ⁇ ), respectively.
  • FIG. 4 shows the synthesis of ⁇ GG by enzymatic glucosylation of glycerol using SPase from Leuconostoc mesenteroides at different pH values.
  • the reaction mixture contained 0.1 M Glc 1-P, 3 M glycerol and 3 IU/ml SPase in 40 mM MES buffer (pH 6.0, 6.5, 7.0) and 40 mM TES buffer (pH 7.5, 8.0), respectively. Conversions were performed at 30° C. and an agitation rate of 550 rpm. The amount of released glucose (cglc) was subtracted from the amount of released phosphate (cP) to define the productivity.
  • FIG. 5 shows the nucleophilic competition in the hydrolysis of sucrose by SPase leading to the synthesis of novel ⁇ -D-gluc-osides.
  • SPase can be obtained as a native enzyme or as a recombinant enzyme (for example but not restricted thereto, produced in Escherichia coli ) according to reports in literature (Guibert A and Monsan P, Ann. N.Y. Acad. Sci. (1988) 504:307-311; Vandamme E J et al., Adv. Appl. Microbiol. (1987) 32:163-201; Kawasaki H et al., Biosci. Biotech. Biochem. (1996) 60:322-324; Kitao S and Nakano E, J. Ferment. Bioeng. (1992) 73:179-184; van den Broek L A M et al., Appl. Microbiol.
  • Biotechnol. (2004) 65:219-227) can of course be produced in various scales represented by shaken flask cultures of a suitable microorganism and bioreactors, preferably an aerated or nonaerated stirred tank reactor or a column reactor such as a bubble column or an airlift reactor. Partial purification or isolation of the enzyme is done using procedures described for SPase or by adopting general protocols of protein purification according to state of the art.
  • Immobilization procedures such as, for example but not restricted thereto, covalent and noncovalent binding to insoluble carriers, encapsulation, and whole-cell systems, is done using protocols already developed for SPase or by adopting general protocols according to state of the art (Pimentel M C B and Ferreira M S S, Appl. Biochem. Biotechnol. (1991) 27:37-43; Soetaert W. et al., Progress in Biotechnology Vol. 10 (Petersen S. B., Svensson, B., Pederesen, S., Eds), Elsevier, Amsterdam; Vandamme E J et al., Adv. Appl. Microbiol. (1987) 32:163-201).
  • SPase activity was determined at 30° C. using a continuous coupled enzymatic assay, in which production of Glc 1-P from sucrose and inorganic phosphate is coupled to the reduction of NAD + in the presence of phosphoglucomutase (PGM) and glucose 6-phosphate dehydrogenase (G6P-DH).
  • PGM phosphoglucomutase
  • G6P-DH glucose 6-phosphate dehydrogenase
  • the standard assay was performed essentially as described elsewhere in 50 mM potassium phosphate buffer, pH 7.0, containing 10 mM EDTA, 10 mM MgCl 2 and 10 ⁇ M ⁇ -D-glucose 1,6-bisphosphate.
  • the reaction mixture contained 250 mM sucrose, 2.5 mM NAD + , 3 U ⁇ ml ⁇ 1 PGM, 3.4 U ⁇ ml ⁇ 1 NAD + -dependent G6P-DH and the enzyme solution in appropriate dilution.
  • the formation of NADH with time was monitored spectrophotometrically at 340 nm.
  • One unit of SPase activity corresponds to the amount of enzyme that caused the reduction of 1 ⁇ mol of NAD+ per minute under the conditions described above.
  • Protein concentrations were determined using the BioRad dye-binding method with bovine serum albumin as standard. Phosphate was determined calorimetrically at 850 nm and Glc 1-P was assayed in a coupled enzymatic system with PGM and G6P-DH.
  • a total amount of 700 U of a preparation of crude SPase with a specific SPase activity of 50 U ⁇ mg ⁇ 1 was incubated at 4° C. with 10 g of Eupergit C in 0.7 M potassium phosphate buffer, pH 7.0, for 14 h. The agitation rate was 250 rpm. The immobilisate was washed several times with 20 mM MES buffer, pH 7.0. The binding efficiency, given by the ratio of the residual activity measured in the supernatant after the immobilisation and the total activity employed (U), was 0.5.
  • Eupergit C onto which SPase was attached, was packed in a GE Healthcare XK26/40 glass column (2.6 cm; 53 ml or 111 ml, 34 U ⁇ g ⁇ 1 Eupergit C), equipped with a thermostatic jacket.
  • the column was equilibrated with 20 mM MES buffer, pH 7.0.
  • the substrate solution contained 600 mM of each, sucrose and phosphate in the same buffer, and was brought to reaction temperature (30° C.) by incubation in a water bath.
  • the solution was pumped through the packed bed at a constant flow rate of 6 ml ⁇ h ⁇ 1 delivered from a GE Healthcare piston pump (model P-500). The temperature at the outlet of the reactor was monitored continuously. At certain times, 1-ml samples were taken and used for further analysis.
  • FIG. 3 shows the time course of Glc 1-P production in a continuous fixed bed reactor operated at a constant axial flow rate of 1.13 cm ⁇ h ⁇ 1 .
  • the conversion of sucrose (600 mM) was 68% and 91% respectively.
  • the corresponding productivities, calculated as g ⁇ l ⁇ 1 product x reciprocal residence time, were 15.4 g ⁇ (l ⁇ h) ⁇ 1 and 10.9 g ⁇ (l ⁇ h) ⁇ 1 . Note that the conversion rate remained constant up to extended reaction times of 650 h, emphasizing the excellent stability of immobilised SPase under the operational conditions.
  • the reaction mixture contained 0.1 M Glc 1-P, 3 M glycerol and 3 IU ⁇ ml ⁇ 1 LmSPase in 40 mM MES buffer (pH 6.0, 6.5, 7.0) or 40 mM TES buffer (pH 7.5, 8.0).
  • the enzymatic conversion was followed over time at 30° C. and an agitation rate of 550 rpm.
  • the concentrations of released phosphate (cP) and glucose (cglc) were determined.
  • the amount of transglucosylation product formed corresponds to cP-cglc. Results are shown in FIG. 4 .
  • the reaction mixture containing 300 mM sucrose, 2 M glycerol and 20 U/ml SPase in 50 mM MES buffer (pH 7), was incubated at 30° C. and 550 rpm for 7.5 hr. Under these optimum conditions selected, the yield of ⁇ GG was higher than 95% ( FIG. 2 ).
  • Product analysis was done using HPLC employing a BioRad HPX-87C column and-reflection index detection. The column was kept at 85° C. and deionized water was used as eluent at a flow rate of 0.6 ml/min. The amount of released glucose was measured using state-of-the-art glucose oxidase/peroxidase assay. NMR analyses, shown in Table 1, confirmed the correct structure of ⁇ GG and the composition of the product mixture. Note that hydrolysis (i.e. formation of glucose) is prevented efficiently under the conditions used in Examples 10a and 10b.
  • ⁇ GG elutes at 2% ethanol, separated from unreacted sucrose as well as fructose. Glycerol is present in the water fraction. The yield of recovered ⁇ GG is 56%, and the purity of ⁇ GG assessed by HPLC is greater than 98%.
  • the protein of interest e.g. mannitol dehydrogenase, MDH
  • MDH mannitol dehydrogenase
  • the samples were lyophilized over-night and dissolved in the same buffer again.
  • the specific enzyme activity was determined, using appropriate assays for the corresponding enzyme as described elsewhere (Slatner M. et al., Biochemistry 38: 10489-10498), before and after freeze drying. Without any stabilizer added the enzymatic activity of MDH dropped down to 2% after freeze drying, whereas ⁇ GG is able to maintain enzymatic activity up to 48% irrespective of the added ⁇ GG concentration.

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US20110207681A1 (en) * 2008-08-22 2011-08-25 Julia Klein Use of glucosylglycerol
US20130029384A1 (en) * 2010-04-06 2013-01-31 Universiteit Gent Thermostable sucrose phosphorylase
US20140315836A1 (en) * 2011-11-24 2014-10-23 Toyo Sugar Refining Co., Ltd. Protective agent for keratoconjunctiva or suppressive agent for keratoconjunctival disorder
CN109762033A (zh) * 2019-01-25 2019-05-17 浙江工业大学 一种甘油葡萄糖苷晶体的制备方法
CN111172127A (zh) * 2020-01-17 2020-05-19 浙江工业大学 一种蔗糖磷酸化酶在制备甘油葡萄糖苷中的应用
CN114736942A (zh) * 2022-03-25 2022-07-12 上海龙殷生物科技有限公司 一种α-甘油葡萄糖苷的制备方法
IT202100008174A1 (it) * 2021-04-01 2022-10-01 Roelmi Hpc S R L Preparazione di gliceril glucoside e sue applicazioni cosmetiche
US12005070B2 (en) 2011-11-24 2024-06-11 Toyo Sugar Refining Co., Ltd. Protective agent for keratoconjunctiva or suppressive agent for keratoconjunctival disorder

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EP2186904B1 (de) * 2008-11-14 2012-07-18 Technische Universität Graz Verfahren zur Herstellung von Glucosederivaten
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JP5998130B2 (ja) * 2010-07-12 2016-09-28 ユニヴェルシテイト ヘントＵｎｉｖｅｒｓｉｔｅｉｔ Ｇｅｎｔ 付加価値バイオ生成物の生成のための代謝操作された生物
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JP2014058472A (ja) * 2012-09-18 2014-04-03 Toyo Seito Kk 皮膚老化防止用化粧料
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CN109576239B (zh) * 2018-12-17 2022-06-28 清华大学 耐热磷酸化酶及其应用
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CN110452845B (zh) * 2019-08-15 2021-03-02 江南大学 一种产蔗糖磷酸化酶的大肠杆菌
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CN113801177B (zh) * 2021-09-10 2022-05-31 珠海市柏瑞医药科技有限公司 α-甘油葡萄糖苷的合成方法

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US20110207681A1 (en) * 2008-08-22 2011-08-25 Julia Klein Use of glucosylglycerol
US9867767B2 (en) * 2008-08-22 2018-01-16 Bitop Ag Use of glucosylglycerol
US20130029384A1 (en) * 2010-04-06 2013-01-31 Universiteit Gent Thermostable sucrose phosphorylase
US20140315836A1 (en) * 2011-11-24 2014-10-23 Toyo Sugar Refining Co., Ltd. Protective agent for keratoconjunctiva or suppressive agent for keratoconjunctival disorder
AU2012341425B2 (en) * 2011-11-24 2017-03-02 Otsuka Pharmaceutical Factory, Inc. Protective agent for keratoconjunctiva or suppressive agent for keratoconjunctival disorder
US12005070B2 (en) 2011-11-24 2024-06-11 Toyo Sugar Refining Co., Ltd. Protective agent for keratoconjunctiva or suppressive agent for keratoconjunctival disorder
CN109762033A (zh) * 2019-01-25 2019-05-17 浙江工业大学 一种甘油葡萄糖苷晶体的制备方法
CN109762033B (zh) * 2019-01-25 2020-10-27 浙江工业大学 一种甘油葡萄糖苷晶体的制备方法
CN111172127A (zh) * 2020-01-17 2020-05-19 浙江工业大学 一种蔗糖磷酸化酶在制备甘油葡萄糖苷中的应用
IT202100008174A1 (it) * 2021-04-01 2022-10-01 Roelmi Hpc S R L Preparazione di gliceril glucoside e sue applicazioni cosmetiche
EP4066813A1 (de) * 2021-04-01 2022-10-05 Roelmi HPC S.r.l Herstellung von glycerylglucosid und kosmetische anwendungen davon
CN114736942A (zh) * 2022-03-25 2022-07-12 上海龙殷生物科技有限公司 一种α-甘油葡萄糖苷的制备方法

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