EP3122890A1 - Nouveaux flavonoïdes o-alpha-glucosylés sur le cycle b, procédé d'obtention et utilisations - Google Patents
Nouveaux flavonoïdes o-alpha-glucosylés sur le cycle b, procédé d'obtention et utilisationsInfo
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- EP3122890A1 EP3122890A1 EP15714775.2A EP15714775A EP3122890A1 EP 3122890 A1 EP3122890 A1 EP 3122890A1 EP 15714775 A EP15714775 A EP 15714775A EP 3122890 A1 EP3122890 A1 EP 3122890A1
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- C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
- C07D311/26—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3
- C07D311/28—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only
- C07D311/30—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only not hydrogenated in the hetero ring, e.g. flavones
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- C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
- C07D311/26—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3
- C07D311/28—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only
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- C12P19/44—Preparation of O-glycosides, e.g. glucosides
- C12P19/46—Preparation of O-glycosides, e.g. glucosides having an oxygen atom of the saccharide radical bound to a cyclohexyl radical, e.g. kasugamycin
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- C12P19/44—Preparation of O-glycosides, e.g. glucosides
- C12P19/60—Preparation of O-glycosides, e.g. glucosides having an oxygen of the saccharide radical directly bound to a non-saccharide heterocyclic ring or a condensed ring system containing a non-saccharide heterocyclic ring, e.g. coumermycin, novobiocin
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- C12Y204/00—Glycosyltransferases (2.4)
- C12Y204/01—Hexosyltransferases (2.4.1)
- C12Y204/01004—Amylosucrase (2.4.1.4)
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Definitions
- New ⁇ - ⁇ -glucosyl flavonoids on cycle B process of obtaining and uses.
- the present invention relates to the field of the glucosylation of flavonoids and more particularly of the ⁇ -glucosylation of certain flavonoids, in order to obtain on- ⁇ -glucosyl flavonoid derivatives, in particular on their aromatic ring B, at the level of non-hydroxyl functions. vicinal.
- the present invention also relates to the O- ⁇ -glucosyl compounds obtained from a glucosylation process of the invention and the use of these compounds for various purposes, in particular cosmetic or therapeutic purposes.
- Flavonoids are compounds having a C 6 -C 3 -C 6 carbonaceous structure, the backbone of which is a cyclic system of type 1-benzopyran, in which the aromatic ring is defined as ring A and the pyranic ring is defined as as ring C, which also comprises a phenyl substituent, on the pyranic ring, as ring B.
- the flavonoids can be hydroxylated in many positions, and these hydroxyl groups are frequently methylated, acetylated, prenylated or sulfated. In plants, they are most often present in the form of soluble C- or O-glycosylated glycosides.
- glucosylation is based on the use of Leloir type glucosyltransferases, capable of transferring the glucosyl residue of a sugar nucleotide (UDP-glucose) to the flavonoid skeleton.
- UDP-glucose sugar nucleotide
- UDP glycosyl transferases have been isolated and cloned into different microorganisms. The natural or recombinant forms of these enzymes can thus be implemented in vitro for the production of glucosylated flavonoids.
- UDP glycosyl transferase from Bacillus cereus has been expressed in Escherichia coli (E. coli).
- This glucosyl enzyme Papigenin, genistein, kaempferol, luteolin, naringenin and quercetin.
- Position 3 is the preferentially glucosylated position, but in the absence of hydroxyl function at this position, glucosylation takes place at position 7.
- the products obtained by the recombinant enzyme are identical to those produced by the wild-type enzyme (Ko JH et al., FEMS Microbiol Lett, 2006, 258: 263-268).
- Bacillus licheniformis DSM 13 UDP-glucosyltransferase YjiC was used for glucosylating Papigenine. Two ⁇ -mono-glucosylated forms, in position 4 'or in position 7, were obtained. A ⁇ -diglucosylated form at positions 4 'and 7 was also structurally characterized (Gurung, R.B. et al., Mol.cells 2013, 36 (4): 355-361).
- Oleandomycin glycosyl transferase (OleD GT) from Streptomyces antibioticus was expressed in E. coli BL 21.
- the purified enzyme catalyzes the glucosylation of several flavonoids: apigenin, chrysin, daidzein, genistein, kaempferol, luteolin, naringenin and quercetin, from UDP-glucose. The best conversion (90%) was obtained with naringenin at 20 ⁇ in 5 h. No indication of the position of glucosylation is specified in the publication. (Choi SH et al., Biotechnol Lett 2012, 34: 499-505).
- RhGT1 The UDP-glycosyltransferase RhGT1 from Rosa hybrida was tested on a collection of 24 flavonoids. It shows results comparable to those obtained with oleandomycin glycosyl transferase in terms of acceptor recognition (Wang L et al., Carbohydr Res 2013, 368: 73-77).
- glycosylation of flavonoids in vitro can be carried out by the use of glycoside-hydrolase type enzymes, cyclodextrin-glucanotransferase transglycosylase or glycoside phosphorylase.
- the enzymatic glycosylation of flavonoids in vitro can be achieved via the implementation of glucan saccharases.
- a synthetic route leads to the production of ⁇ -glucosylated flavonoids, and is based on the use of glucan-saccharases belonging to the 13 or 70 families of glycoside hydrolases (GH 13 and GH 70) (CAZy classification - Henrissat B, Davies GJ, Curr Op Op Struct Biol., 97, 7: 637-64).
- Glucansucrases are transglucosylases which catalyze from sucrose the synthesis of homopolymers, consisting of ⁇ -D-glucosyl units, called glucan. These glucans are generally of very high molar mass (10 8 Da), and have various structures due to the presence of different types of osidic bonds ( ⁇ -1, 2, ⁇ -1, 3, ⁇ -1, 4, and or ⁇ -1, 6) as well as their location in the polymer. Isomers of sucrose and glucose are also produced from sucrose but in very small amounts compared to the polymer.
- these enzymes are capable of glucosylating hydroxylated molecules called "acceptors", introduced into the reaction medium in addition to sucrose, such as flavonoids.
- acceptors hydroxylated molecules
- the degree of glucosylation of the acceptor depends on its structure as well as that of the enzyme.
- an efficient acceptor, or a good acceptor will be able to divert polymer synthesis almost completely to the benefit of its own glycosylation.
- an ineffective acceptor, or bad acceptor can only very slightly divert the synthesis of polymers and therefore will be very little, if any, glucosylated.
- Streptococcus sobrinus 6715 was performed in 100 mM phosphate buffer (pH 6) in the presence of 1 g of catechin and 2% of sucrose (Nakahara et al., Appl., Environ Microbiol., 1995, 61: 2768-2770).
- the monoglucosylated product obtained with a yield of 13.7% is 4'-O- ⁇ -D-glucopyranosyl - (+) - catechin.
- Epigallocatechin gallate was also glucosylated in the presence of sucrose and glucansucrase of Leuconostoc mesenteroides B-1299CB (Moon et al., Journal of Molecular Catalysis B: Enzymatic, 2006, 40: 1-7). A mixture of three products was obtained:
- Glucosylation of quercetin was performed in 2007 in the presence of sucrose and glucansucrase of Leuconostoc mesenteroides B-1299CB (Moon YH et al., Enzyme Microb Technol 2007, 40: 124-1129). A mixture of two products monoglucosylates is obtained: 4'-O- ⁇ -D-glucopyranosylquercetin and 3'-O- ⁇ -D-glucopyranosylquercetin.
- Auriol et al. have described the preparation of phenolic derivatives obtained by enzymatic condensation between phenolic compounds selected from pyrocatechols or their derivatives, and the glucosyl residue from sucrose.
- the production of these phenol compounds derivatives is carried out with a glucosyltransferase (EC 2.4.1.5).
- the O- ⁇ -D-glucosides of synthesized phenolic compounds have a solubility in water greater than that of their parent polyphenol.
- antioxidant antiviral, antibacterial, immunostimulant, antiallergic, antihypertensive, anti-ischemic, antiarrhythmic, antithrombic, hypocholesterolemic, antilipoperoxidant, hepatoprotective, anti-inflammatory, anticarcinogenic, antimutagenic, antineoplastic and vasodilators.
- the glucosylation of ampelopsin was furthermore carried out in the presence of sucrose and glucansucrase of Leuconostoc mesenteroides B-1299CB4.
- Five glucosylation products were isolated and the monoglucosylation product characterized: it is 4'-O- ⁇ -D-glucopyranosylampelopsin (Woo HJ et al., Enzyme Microb Technol., 2012 51: 311-318).
- the present invention provides a process for producing O- ⁇ -glucosylated flavonoid derivatives comprising at least one step of incubating a glucanucrase with a flavonoid and at least one sucrose, wherein:
- ring C represents a ring selected from the group consisting of the following rings of formulas (II), (III), (IV) or (V):
- one of the groups R1, R2 or R3 represents a ring B of formula (VI)
- R 8 and only one of the groups selected from R 10 , R 11 and R 12 represent a hydroxyl group
- R 9 and the other groups of R 10 , R 11 and R 12 being chosen from the group comprising a hydrogen atom; a linear or branched, saturated or unsaturated C 1 -C 10 hydrocarbon group optionally interrupted by at least one heteroatom selected from O, N or S; a halogen atom; a C 5 -C 9 aryl; a C 4 -C 9 heterocycle; a (C 1 -C 3 ) alkoxy group; a C 2 -C acyl; a C 1 -C 3 alcohol; a -COOH group; -NH 2 ; -CONH 2 ; -CHO; -SH; -C (O) O (C 2 -C 3 ); an amino C 1 -C 3 alkyl; a C 1 -C 3 imine; a nitrile group; a C 1 -C 3 haloalkyl; a C 1 -C 3 thioalkyl; a group -C (
- R 9 and only one of the groups selected from R 11 and R 12 represent a hydroxyl group
- R 8 , R 10 , and the other group of R 11 and R 12 which are identical or different, being chosen from the group comprising a hydrogen atom; a linear or branched, saturated or unsaturated C 1 -C 10 hydrocarbon group optionally interrupted by at least one heteroatom selected from O, N or S; a halogen atom; a C 5 -C 9 aryl; a C 4 -C 9 heterocycle; a (C 1 -C 3 ) alkoxy group; a C 2 -C 3 acyl; a C 1 -C 3 alcohol; a -COOH group; -NH 2 ; -CONH 2 ; -CHO; -SH; -C (O) O (C 2 -C 3 ); a C 1 -C 3 amine; a C 1 -C 3 imine; a nitrile group; a C 1 -C 3 haloalkyl; a C 1 -C 3 thioalkyl;
- R 10 and R 12 represent a hydroxy group
- the groups R 8 , R 9 and R 11 being chosen from the group comprising a hydrogen atom; a linear or branched, saturated or unsaturated C 1 -C 10 hydrocarbon group optionally interrupted by at least one heteroatom selected from O, N or S; a halogen atom; a C 5 -C 9 aryl; a C 4 -C 9 heterocycle; a (C 1 -C 3 ) alkoxy group; a C 2 -C 3 acyl; a C 1 -C 3 alcohol; a -COOH group; -NH 2 ; -CONH 2 ; -CHO; -SH; -C (O) O (C : -C 3 ); a C 1 -C 3 amine; a C 1 -C 3 imine; a nitrile group; a C 1 -C 3 haloalkyl; a C 1 -C 3 thioalkyl; a group -C (W); and
- R 8 , R 10 and R 12 represent a hydroxy group
- the groups R 9 and R 11 identical or different, being chosen from the group comprising a hydrogen atom; a linear or branched, saturated or unsaturated C 1 -C 10 hydrocarbon group optionally interrupted by at least one heteroatom selected from O, N or S; a halogen atom; a C5-G aryl); a C 4 -C 9 heterocycle; a (C 1 -C 3 ) alkoxy group; acyl, C 2 -C 3; a C 1 -C 3 alcohol; a -COOH group; -NH 2 ; -CONH 2 ; -CHO; -SH; -C (O) O (C 2 -C 3 ); a C 1 -C 3 amine; a C 1 -C 3 imine; a nitrile group; a C 1 -C 3 haloalkyl; a C 1 -C 3 thioalkyl; a group
- W represents a chain consisting of 1 to 6 glycoside (s);
- R 1, R 2 'and R 3, which are identical or different, being chosen from the group comprising a hydrogen atom; a linear or branched, saturated or unsaturated C 1 -C 10 hydrocarbon group optionally interrupted by at least one heteroatom selected from O, N or S; a halogen atom; a C 5 -C 9 aryl; a heterocyclic C 4 -C 9; a group
- R 1 and R 2 when R 1 does not represent a ring B of formula (VI), or R 2 and R 2 'when R 2 does not represent a ring B of formula (VI), or R 3 and R' when R 3 does not represent a ring B of formula (VI), together form a group 0;
- glucan-sucrase being selected from the group consisting of:
- sequence having at least 80% identity with SEQ ID NO: 2 said sequence having an amino acid X 2 representing an amino acid selected from the group consisting of A. C, D, F, G, H, K L, M, N, P, S, V and Y;
- SEQ ID NO: 4 said X 4 amino acid sequence being an amino acid selected from the group consisting of C, I, N, P, V and W;
- X 9 represents, independently of X 10 , X 11 , X 12 and X 13 , an amino acid selected from the group consisting of G, S, V, C, F, N, I, L and W;
- X 10 is independently XQ, X 11, X 12 and X 13, an amino acid selected from the group consisting of L, I, M, Y and F;
- X 11 representing, independently of X 9 , X 10 , X 11 and X 13 , an amino acid selected from the group consisting of E and A;
- X 12 represents, independently of X 9 , X 10 , X 11 and X 13 , an amino acid selected from the group consisting of L and F and
- X 12 represents, independently of X ⁇ >, ⁇ ) 0 , X 11 and X 13 , an amino acid selected from the list consisting of A, R, D, N, C, E, Q, G, H, I, L ,, M, P, S, T, W, Y and V, preferably I; and
- X 13 represents, independently of X 9 , X 1 () , X 11 and X 12 , an amino acid selected from the list consisting of A, R, D, N, C, E, Q, G, H, I, K , M, F, P, S, T, W, Y and V, preferably I.
- glucan-saccharase used in a method of the invention is chosen from the group comprising:
- sequence having at least 80% identity with SEQ ID NO: 2 said sequence having an amino acid X 2 representing an amino acid selected from the group consisting of A, C, F, L, M, S or V ;
- X 9 represents an amino acid selected from the group consisting of G, V, C and
- X 10 representing F
- X 11 representing A
- X 12 representing F
- X 13 representing L
- X 9 represents, independently of X 9 , X 10 , X 11 and X 13 , an amino acid selected from the group consisting of S, N, L and I;
- X 10 representing, independently of X 9, X 11, X 12 and X 13, an amino acid selected from the group consisting of L, I, M and Y;
- sequence having at least 80% identity with SEQ ID NO: 12 is the sequence SEQ ID NO: 13.
- the subject of the invention is also an O- ⁇ -glycosylated flavonoid derivative obtained by the process of the invention, and in particular of formula (I) as defined above in which ring C represents the cycle of formula (IV ) in which the group R 1 represents a ring B of formula (VI); and at least ring B is O- ⁇ -glycosylated.
- the present invention advantageously makes it possible to obtain flavonoid derivatives according to the invention which are at least O- ⁇ -glycosylated, in particular O- ⁇ -glucosylated, on the B-ring.
- the invention further relates to a compound of formula (X) below:
- X 1 and X 16 which are identical or different, are chosen from the group comprising a hydrogen atom; a linear or branched C 1 -C 6 alkyl; a -C (O) O (C 2 -C 3 ) group; and a chain consisting of 1 to 600,000 ⁇ -glucoside moieties.
- a chain consisting of 1 to 600,000 ⁇ -glucoside groups according to the invention may more particularly consist of 1 to 500,000 ⁇ -glucoside groups, from 1 to 400,000 ⁇ -glucoside groups, from 1 to 300,000 ⁇ -glucoside groups, from 1 to 200,000 ⁇ -glucoside groups, from 2 to 100,000 ⁇ -glucoside groups, from 5 to 50,000 ⁇ -glucoside groups, from 10 to 25,000 ⁇ -glucoside groups or from 10 to 10,000 ⁇ -glucoside groups.
- the invention also relates to a compound of formula (XI) below:
- X 17 represents a chain consisting of 1 to 600,000 ⁇ -glucoside moieties
- X 18 and X 19 which are identical or different, are chosen from the group comprising a hydrogen atom; a linear or branched C 1 -C 6 alkyl; a group -C (O) O (C 2 -C); and a chain consisting of 1 to 600,000 ⁇ -glucoside moieties.
- the present invention also relates to the cosmetic use, as antioxidant agent, of at least one de- ⁇ -glycosylated flavonoid derivative according to the invention.
- the present invention further provides an O- ⁇ -glycosylated flavonoid derivative according to the invention for its pharmaceutical use in the treatment and / or prevention of hepatotoxicity, allergies, inflammation, ulcers, tumors, menopausal disorders, or neurodegenerative diseases.
- Another aspect of the invention relates to an O- ⁇ -glycosylated flavonoid derivative according to the invention for its pharmaceutical use as a veinotonic.
- the present invention relates to the use of a flavonoid derivative
- ⁇ - ⁇ -glycosylated according to the invention as a photovoltaic agent, insect repellent agent, bleaching agent, pesticidal agent, fungicidal agent and / or bactericidal agent.
- the following terms mean:
- linear or branched, saturated or unsaturated C 1 -C 10 hydrocarbon-based group optionally interrupted by at least one heteroatom selected from O, N or S: an alkyl or an alkylene;
- alkyl a saturated, linear or branched, saturated hydrocarbon aliphatic group comprising from 1 to 10, preferably from 1 to 6 carbon atoms;
- cycloalkyl a cyclic alkyl group comprising from 3 to 10 ring members, preferably from 3 to 8 ring members.
- the cycloalkyl group is optionally substituted with one or more halogen atoms and / or alkyl groups;
- heterocycle a cyclic alkyl group comprising from 4 to 9 ring members, preferably from 3 to 8 ring members, and consisting of 1 to 3 rings, comprising between 3 and 6 carbon atoms and 1 or more heteroatoms, for example 1, 2 or 3 heteroatoms, preferably 1 or 2, selected from nitrogen, oxygen and sulfur.
- the heterocycle group is optionally substituted with one or more halogen atoms and / or alkyl groups;
- partially cyclic alkyl group means an alkyl group of which only one part forms a ring
- alkylene a linear or branched divalent alkylene group comprising from 1 to 10, preferably from 1 to 6, carbon atoms;
- aryl a cyclic aromatic group comprising between 5 and 9 carbon atoms, for example a phenyl group;
- heteroaryl a cyclic aromatic group comprising between 3 and 10 atoms, including 1 or more heteroatoms, for example between 1 and 4 heteroatoms, such as nitrogen, oxygen or sulfur, this group comprising one or more rings, preferably 1 or 2 cycles.
- the heterocycles may comprise several fused rings.
- the heteroaryls are optionally substituted by one or more alkyl groups or an oxygen atom.
- - halogen an atom of chlorine, fluorine, bromine or iodine
- - C 1 -C 3 alcohol an alcohol selected from methanol, ethanol, propanol and isopropanol;
- a (C 1 -C 3 ) alkoxy a group chosen from a methoxyl, an ethoxyl, a propyloxyl and an isopropyloxyl;
- C 2 -C 3 acyl a group chosen from an acetyl, a propylacetyl and an isopropylacetyl;
- C 1 -C 3 amine a group chosen from a methylamine, an ethylamine and a propylamine;
- C 1 -C 3 imine a group chosen from a methylimine, an ethylimine and a propylimine;
- glycoside is used to designate a glycoside moiety.
- glycoside units are known to those skilled in the art.
- glycosides As examples of monosaccharide glycosides, the following glycosides may be mentioned: glucose, fructose, sorbose, mannose, galactose, talose, allose, gulose, idose, glucosamine, N-acetylglucosamine, mannoamine, galactosamine, glucuronic acid, rhamnose, arabinose , galacturonic acid, fucose, xylose, lyxose and ribose.
- glycosides As examples of di- or oligosaccharide glycosides, the following glycosides may be mentioned:
- maltose maltose, gentiobiose, lactose, cellobiose, isomaltose, melibiose, laminaribiose, chitobiose, xylobiose, mannobiose, sophorose, nigerose, kojibiose, rutinose, robinose,
- oligo-sacchacaride panose, galactotriose, ⁇ -glucotriose, ⁇ -glucotetraose, galactotetraose, especially maltodextrins, maltotriose, isomaltotriose, maltotetraose, maltopentaose, maltoheptaose.
- glycosides can also be cited:
- starch drifts especially maltose, maltodextrins,
- galactomannans and their derivatives.
- the term "a chain consisting of 1 to 6 glycoside (s)" a sequence of 1 to 6 glycosides mentioned above.
- a chain consisting of 1 to 600,000 o-glucoside groups a sequence of one to 600,000 glucosyl units linked to each other by a bonds.
- Figure 1 illustrates the glucosylation efficiencies of apigenin (histogram - left-hand ordinate -%), the levels of relative activity on sucrose alone ( ⁇ blackheads - right-hand ordinate - AU) and the mass concentrations of glucosylated apigenin ( values above the histogram - mg / L), ASNp WT, DSR-S vardelA4N WT enzymes and their mutants ASNp I228F, ASNp I228L, ASNp I228M, ASNp F229A, ASNp F229N, ASNp A289W, ASNp F290C, ASNp F290K and DSR-S vardelA4N S512C.
- Figure 2 illustrates the superposition of UV chromatograms ( ⁇ 340 nm) for the six representative mutants of the six categories of apigenin glucosylation product profiles.
- the names of the enzymes corresponding to these reactions are indicated next to each chromatogram: ASNp A289W, DSR-S vardelA4N S512C, ASNp F290, ASNp F290C, ASNp F229N and ASNp 1228F.
- On the abscissa Retention time in minutes; On the ordinate: Absorbance in mAU (Milliabsorbance Units).
- Figure 3 illustrates the superposition of UV chromatograms ( ⁇ 340 nm) for the seven mutants representative of the six categories of naringenin glucosylation product profiles.
- the names of the enzymes corresponding to these reactions are indicated next to each chromatogram: ASNp F290V, ASNp R226N, ASR C-APY del, "-1, 2 BrS, ASNp A289C, ASNp A289P / F290C and ASNp I228A.
- On the abscissa Retention time in minutes; On the ordinate: Absorbance in mAU (Milliabsorbance Units).
- FIG. 4 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the wild-type ASNp enzyme (ASNp WT), in comparison with the apigenin standard.
- ASNp WT wild-type ASNp enzyme
- Figure 5 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp I228F enzyme.
- Figure 6 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp I228L enzyme.
- abscissa Retention time in minutes;
- Absorbance in mAU Absorbance Units.
- Figure 7 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp I228M enzyme.
- abscissa Retention time in minutes;
- FIG. 8 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp F229A enzyme.
- Figure 9 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp F229N enzyme.
- abscissa Retention time in minutes;
- Figure 10 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp A289W enzyme.
- Figure 11 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp F290C enzyme.
- Figure 12 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant ASNp F290K enzyme.
- abscissa Retention time in minutes;
- Figure 13 illustrates the UV chromatography profile obtained after glucosylation of apigenin, for the mutant enzyme DSR-S vardelA4N S512C.
- abscissa Retention time in minutes; On the ordinate: Absorbance in mAU (Milliabsorbance Units). The nature of the different peaks is indicated directly on the profile.
- Figure 14 illustrates the high resolution electrospray-positive mass spectrum for the mono-glucosylated form of apigenin obtained with the mutant DSR-S vardel A4N S512C enzyme. On the abscissa: ratio m / z; On the ordinate: relative abundance.
- Figure 15 illustrates the high resolution MS MS spectrum in electrospray negative mode for the mono-glucosylated form of apigenin (at m / z 431, 11) obtained with the mutant enzyme DSR-S vardelA4N S512C. On the abscissa: ratio m / z; On the ordinate: relative abundance.
- Figure 16 illustrates the high resolution electrospray-positive mass spectrum for the mono-glucosylated form of apigenin obtained with the mutant ASNp A289W enzyme. On the abscissa: ratio m / z; On the ordinate: relative abundance.
- Figure 17 illustrates the high resolution mass spectrum in electrospray positive mode for the di-glucosylated forms of apigenin obtained with the mutant ASNp A289W enzyme. On the abscissa: ratio m / z; On the ordinate: relative abundance.
- Figure 18 illustrates the high resolution MS MS spectrum in negative electrospray mode for one of the two di-glucosylated forms of apigenin (at m / z 593.16) obtained with the mutant ASNp A289W enzyme. On the abscissa: ratio m / z; On the ordinate: relative abundance.
- Figure 19 illustrates the high resolution MS / MS spectrum in negative electrospray mode for one of the two diglucosylated forms of apigenin (at m / z 593.16) obtained with the mutant ASNp A289W enzyme. On the abscissa: ratio m / z; On the ordinate: relative abundance.
- FIG. 20 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the wild ASNp enzyme (ASNp WT), compared with the naringenin standard.
- ASNp WT wild ASNp enzyme
- FIG. 21 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the ASNp 1228 A mutant enzyme.
- abscissa Retention time in minutes
- On the ordinate Absorbance in mAU (Milliabsorbance Units).
- Figure 22 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the mutant ASNp A289C enzyme.
- abscissa Retention time in minutes;
- Absorbance in mAU Meliabsorbance Units.
- FIG. 23 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the ASR-C-APY-del truncated wild-type enzyme.
- Figure 24 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the mutant ASNp A289P / F290C enzyme.
- Abscissa Retention time in minutes;
- Absorbance in mAU Absorbance Units.
- FIG. 25 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the wild-type enzyme ⁇ -1, 2 BrS.
- Figure 26 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the mutant ASNp F290V enzyme.
- Figure 27 illustrates the UV chromatography profile obtained after glucosylation of naringenin, for the mutant ASNp R226N enzyme.
- abscissa Retention time in minutes;
- Absorbance in mAU Absorbance Units.
- Figure 28 illustrates the 1 H CO 2 Y NMR spectrum of 4 , -O- ⁇ -D-glucopyranosylnaringenin. On the abscissa and ordinate: chemical shift, in part per million (ppm).
- Figure 29 illustrates the 1D 13 C NMR spectrum Jmod of the
- Figure 30 illustrates the 2D HMBC NMR spectrum of 4'-O- ⁇ -D-glucopyranosylnaringenin. On the abscissa and ordinate: chemical shift, in part per million (ppm).
- Figure 31 illustrates the superposition of chromatographic profiles obtained by LC-UV-MS for the products of glucosylation of morine by the enzyme ⁇ N 123 -GBD-CD2 WT and three of the most effective mutants to glucosylate this flavonoid.
- abscissa Retention time in minutes;
- Absorbance in mAU Absorbance Units.
- Figure 32 illustrates the superposition of chromatographic profiles obtained by LC-UV-MS for the naringenin glucosylation products by the enzyme ⁇ N 123 -GBD-CD2 and three of its mutants effective for glucosylating this flavonoid.
- abscissa Retention time in minutes;
- the applicant has developed a new process for synthesizing new structures of ⁇ -gluco-flavonoids specifically glycosylated on non-vicinal hydroxyls, in particular of the B-ring. implements specific mutated glucan-saccharases, identified by the applicant, capable of performing such glucosylation.
- Glucan saccharases of the invention require only the presence of sucrose, a renewable and cheap agro-resource. As such, a method according to the invention is advantageously inexpensive. Glucan saccharases of the invention
- the present invention relates first of all to a process for producing O- ⁇ -glucosylated flavonoid derivatives comprising at least one step of incubating an enzyme of the invention with a flavonoid of formula (I) and at least one sucrose.
- the enzymes of the invention are advantageously capable of glucosylating flavonoids at the level of non-vicinal hydroxyl function (s), in particular present on the B cycle.
- These enzymes consist more particularly of glucansucrases belonging to the families 13 and 70 of the glycoside hydrolases (GH13 and GH70).
- Glucansucrases belonging to the family 13 are naturally produced by the bacteria of the genera Deinococcus, Neisseria or Alteromonas.
- the glucan-saccharases belonging to the 70 family are naturally produced by lactic acid bacteria of the genera Leuconostoc, Lactobacillus, Sireptococcus or Weisscla sp.
- the inventors have determined variants of these enzymes, mutated at their flavonoid binding site, and able to glucosylate such compounds effectively.
- GH13 (AmyloSucrase Neisseria polysaccharea) (GH13 family) is GenBank AJ01 1781.1, while its polypeptide sequence is Uniprot Q9ZEU2.
- the nucleotide sequence of the wild form of the DSR-S enzyme (derived from the strain Leuconostoc mesenteroides B-512F) is GenBank reference 109598.
- the nucleotide sequence of the wild form of the DSR-E enzyme (from Leuconostoc mesenteroides strain NRRL B-1299) is GenBank AJ430204.1 and reference Uniprot Q8G9Q2.
- the enzyme AN123-GBD-CD2 (sequence SEQ ID No. 12) is a truncated form of the aforementioned DSR-E enzyme as described in Brison et al., J. Biol. Chem., 2012, 287, 7915-24.
- Tables 1 and 4 the method for obtaining the mutated enzymes is described in European Patent Application EP 2 100 966 A1.
- an enzyme according to the invention can be synthesized by conventional methods of synthetic chemistry, or homogeneous chemical syntheses in solution or in solid phase.
- an enzyme according to the invention can be synthesized by conventional methods of synthetic chemistry, or homogeneous chemical syntheses in solution or in solid phase.
- one skilled in the art can use the polypeptide synthesis techniques in solution described by HOUBEN WEIL (1974, In method of Organischen Chemie, E. Wunsh ed., Volume 15-1 and 15-II, Thieme , Stuttgart.).
- An enzyme according to the invention may also be chemically synthesized in the liquid or solid phase by successive couplings of the different amino acid residues (from the N-terminal end to the C-terminal end in the liquid phase, or from the C-terminus towards the N-terminus in solid phase).
- Those skilled in the art can in particular use the solid phase peptide synthesis technique described by Merrifield (MERRIFIELD RB, (1965a), Nature, vol.207 (996): 522-523, MERRIFIELD RB, (1 65b), Science, vol.150 (693): 178-185.
- an enzyme according to the invention can be synthesized by genetic recombination, for example according to a production method comprising the following steps:
- step (b) transfecting a host cell with the recombinant vector obtained in step (a);
- step b) culturing the host cell transfected in step b) in a suitable culture medium
- glucan-saccharases that can be used in a process of the invention are chosen from a group comprising:
- sequence having at least 80% identity with SEQ ID NO: 2 said sequence having an amino acid X 2 representing an amino acid selected from the group consisting of A, C, D, F, G, H, K; L, M, N, P, S, V and Y;
- amino acid X 4 representing an amino acid selected from the group consisting of C, I, N, P, V and W;
- amino acid X 5 representing an amino acid selected from the group consisting of A, C, D, G, I, K, L, M, R, V and W;
- X 9 represents, independently of X 10 , X 11 , X 12 and X 13 , an amino acid selected from the group consisting of G, S, V, C, F, N, I, L and W;
- X 10 representing, independently of X 9, X 11, X 12 and X 13, an amino acid selected from the group consisting of L, I, M, Y and F;
- X 11 representing, independently of X 9 , X 10 , X 12 and X 13 , an amino acid selected from the group consisting of E and A;
- X 11 represents, independently of X 9 , X 10 , X 11 and X 1 , an amino acid selected from the group consisting of L and F;
- X 12 represents, independently of X 9 , X 10 , X 11 and X 13 , an amino acid selected from the group consisting of A, R, D, N, C, E, Q, G, H, 1, L, K , M, P, S, T, W, Y and V; and X 1 3 representing, independently of X 9 , X 10 , X 11 , and X ! 2 , an amino acid selected from the group consisting of A, R, D, N, C, E, Q, G, H, I, , M, F, P, S, T, W, Y and V.
- 80% identity with SEQ ID NO: 12 indicated above is preferably such that:
- X 9 represents, independently of X 10 , X 11 , X 12 and X 13 , an amino acid selected from the group consisting of G, S, V, C, F, N, I, L and W;
- X 10 represents, independently of X 9, X 11, X 12 and X 13, an amino acid selected from the group consisting of L, I, M, Y and F;
- X 11 is A
- X 12 is F
- X 1 represents L
- X 10 is F
- X 11 represents, independently of X 9 , X 10 , X 12 and X 13 , an amino acid selected from the group consisting of E and A;
- X 12 represents, independently of X 9 , X 10 , X 12 and X 13 , an amino acid selected from the group consisting of L and F;
- X 13 is L
- amino acids defined as respectively X 1 , X 2 , X 3 , X 4 . X 5 , X 6 , X 7 , X 8 , X 9 , X 10 . X 11 , X 12 and X 13 are present and as defined above in the glucansucrases of the invention having at least 80% identity with, respectively, a sequence SEQ ID NO: 1 to 7, 9 and 12, as defined above.
- all the enzymes possessing one of these peptide sequences have a capacity that is statistically greater than that of the wild-type glucosylating enzyme of the invention, having non-vicinal hydroxyl functions, especially on the cycle.
- the present invention also encompasses sequences having an amino acid sequence of at least 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% of amino acid identity with one of SEQ ID NO: 1 to 12 such as previously defined and a biological activity of the same nature.
- the "percentage of identity" between two nucleic acid or amino acid sequences is determined by comparing the two optimally aligned sequences, through a comparison window.
- the part of the nucleotide sequence in the comparison window may thus comprise additions or deletions (for example "gaps") with respect to the reference sequence (which does not include these additions or deletions) so as to obtain a optimal alignment between the two sequences.
- the percent identity is calculated by determining the number of positions at which an identical nucleotide base (or identical amino acid) is observed for the two compared sequences, and then dividing the number of positions at which there is identity between the two nucleic bases. (or between the two amino acids) by the total number of positions in the comparison window, then multiplying the result by one hundred in order to obtain the percentage of nucleotide (or amino acid) identity of the two sequences between them.
- the optimal alignment of the sequences for the comparison can be performed in a computer manner using known algorithms.
- the present invention also relates to sequences whose amino acid sequence has 100% amino acid identity with amino acids 225 to 450 of SEQ ID NO: 1 to 9, or 100% identity in amino acids with amino acids 2130 to 2170 of the sequence SEQ ID NO: 12 and at least 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97, 98%, 99% or 100% of amino acid identity with the rest of the sequences SEQ ID NO: 1 to 12 such than previously defined, and a biological activity of the same nature.
- the glucan-saccharases preferentially used in a method of the invention are chosen from the group comprising:
- sequence having at least 80% identity with SEQ ID NO: 2 said sequence having an amino acid X 2 representing an amino acid selected from the group consisting of A, C, F, L, M, S or V ;
- sequence having at least 80% identity with SEQ ID NO: 4 said sequence having an amino acid X 4 representing an amino acid selected from the group consisting of C.I., N.P., V or W; a sequence having at least 80% identity with SEQ ID NO: 5, said sequence having an amino acid X 5 representing an amino acid selected from the group consisting of C, K, R or V;
- X 9 represents an amino acid selected from the group consisting of G, V, C and F;
- X 9 represents, independently of X 10 , X 11 , X 12 and X 13 , an amino acid selected from the group consisting of S, N, L and I;
- X 10 representing, independently of X 9, X 11, X 12 and X 11, an amino acid selected from the group consisting of L, I, M and Y;
- sequence having at least 80% identity with SEQ ID NO: 12 is the sequence SEQ ID NO: 13.
- a sequence having at least 80% identity with SEQ ID NO: 12, having the amino acids X 9 , X 10 , X 11 , X 12 and X 13 , is such that:
- X 9 represents an amino acid selected from the group consisting of G, V, C and F;
- X 10 representing, independently of X 9, X 11, X 12 and X 13, an amino acid selected from the group consisting of L, I and Y;
- sequence having at least 80% identity with SEQ ID NO: 12 is the sequence SEQ ID NO: 13.
- NO: 12 are in particular indicated in Example 1 1 of the present application.
- Enzymes whose sequence has at least 80% identity with SEQ ID NO 12 have a flavonoid glucosylation efficiency of the invention greater than 5%, 10%, 15%, 20%, 25%, 30% , 35%, 40%, 45% or 50% compared with 20.4 +/- 3.2% or 13.9 +/- 4.7% respectively for the wild-type enzyme (see Tables 7 and 8).
- Flavonoids derivatives and implements
- the flavonoids specifically used in a process of the invention are of formula (I) as described above.
- only one of the groups chosen from R 8 , R 9 , R 10 , R 11 and R 12 represents a hydroxyl group
- the groups X 8 , R 9 , R 11 and R 12 represent hydrogen atoms.
- the group R 10 represents a hydroxyl group and the groups R 8 , R 9 , R 11 and R 12 represent hydrogen atoms.
- the ring C represents a ring of formula (II) or (IV) as defined above. According to one embodiment, the ring C represents a ring of formula (II). In another embodiment, ring C represents a ring of formula (IV).
- the group R 1 represents a ring B of formula (VI) as defined above.
- the ring C represents a ring of formula (II) and the group R 1 represents a ring B of formula (VI) as defined above.
- the ring C represents a ring of formula (IV) and the group R 1 represents a ring B of formula (VI) as defined above.
- the group R 1 represents a ring B of formula (VI)
- the groups R 1 ', R 2 and R' represent hydrogen atoms
- the ring C represents a ring of formula (II) or (IV)
- the group R 1 represents a ring B of formula (VI)
- the groups R 1 ', R 2 and R 2 ' represent hydrogen atoms
- two of the groups R 4 , R 5 , R 6 and R 7 represent a hydroxyl group, the other two groups being as previously defined.
- the two groups representing a hydroxyl group are the groups R 4 and R 6 .
- two of the groups R 4 , R 5 , R 6 and R 7 represent a hydroxyl group, the other two groups representing a hydrogen atom. According to one embodiment, the groups R and R 7 represent hydrogen atoms.
- the groups R4 and represent a hydroxyl group and the groups R5 and R represent a hydrogen atom.
- X 8 and only one of the groups chosen from R 10 , R 11 and R 12 represent a hydroxyl group
- R 9 and the other groups of R 10 , R 11 and R 12 being chosen from the group comprising a hydrogen atom; a linear or branched, saturated or unsaturated C 1 -C 10 hydrocarbon group optionally interrupted by at least one heteroatom selected from O, N or S; a halogen atom; a C 5 -C 9 aryl; a C 4 -C 9 heterocycle; a (C 1 -C 3 ) alkoxy group; a C 2 -C 3 acyl; a C 1 -C 3 alcohol; a -COOH group; -NH 2 ; -CONH 2 ; -CHO; -SH; -C (O) O (C -C 3 ); an amino C 1 -C 3 alkyl; a C 1 -C 3 imine; a nitrile group; a C 1 -C 3 haloalkyl; a C 1 -C 3 thioalkyl; a group -C (
- the group R 1 represents a hydroxyl group.
- the groups R 9 , R 11 and R 12 represent hydrogen atoms.
- the groups R 8 and R 10 represent a hydroxyl group and the groups R ⁇ >, R 11 and R 12 represent hydrogen atoms.
- the ring C represents a ring of formula (II) or (IV), preferably (II), as defined above.
- the group R 1 represents a ring B of formula (VI) as defined above.
- the groups R 1 'and R 2 ' represent hydrogen atoms
- R 2 represents a hydrogen atom or a group -OH, preferably a group -OH
- the group R 1 represents a ring B of formula (VI)
- the groups R 1 'and R 2 ' represent hydrogen atoms
- R 2 represents a group -OH
- R 3 and R together form a group 0.
- the ring C represents a ring of formula (II)
- the group R 1 represents a ring B of formula (VI)
- the group R 2 represents a group -OH
- a flavonoid used in a process of the invention has the following formula (VII), (VIII) or (IX):
- a flavonoid of the invention may be used in a process of the invention at a flavonoid-to-sucrose molar ratio of between 1 and 35,000, the reaction mixture comprising at least F (the) enzyme (s), sucrose and the flavonoid (s) receptor (s).
- the sucrose to flavonoid molar ratio is between 7 and 292, the reaction mixture comprising at least the enzyme (s), sucrose and the flavonoid (s) receptor (s).
- the reaction mixture comprising at least the enzyme (s), sucrose and the flavonoid (s) receptor (s).
- the present invention also relates to certain ⁇ - ⁇ -glucosyl flavonoid derivatives. Those are obtainable from a process of the invention.
- the present invention relates more particularly to compounds of formula (X) below: in which X ] 4 represents a chain consisting of at least two groups
- ⁇ -glucoside, and X1 and X are chosen from the group comprising a hydrogen atom, a linear or branched C 1 -C 6 alkyl, a -C (O) ⁇ D (C 2 -C 3 )) group, and a chain consisting of 1 to 600,000 ⁇ -glucoside moieties
- a compound according to the invention and glucosylated using a glucansucrase according to the invention may indeed comprise a chain consisting of 1 to 600,000 ⁇ -glucoside groups.
- the present invention also provides compounds of formula (XI) below:
- X 17 represents a chain consisting of 1 to 600,000 ⁇ -glucoside moieties
- X 18 and X 13, which are identical or different, are chosen from the group comprising a hydrogen atom; a linear or branched C 1 -C 6 alkyl; a group -C (O) O (C 2 -C 3 ); and a chain consisting of 1 to 600,000 ⁇ -glucoside moieties.
- the O- ⁇ -glucosyl flavonoid derivatives of the invention may be used as antioxidant (Heim et al., J. Nutr Biochem., 2002, 13: 572-584).
- the ⁇ - ⁇ -glucosyl flavonoid derivatives of the invention can be used for their pharmaceutical use in the treatment and / or prevention of hepatotoxicity, allergies, inflammation, ulcers, tumors, menopausal disorders or neurodegenerative diseases (Harbome J. et al., Phytochemistry, 2000 55: 481-504, Quideau S. et al., Angel, Chem., Int., End 201, 50: 586- 621).
- the O- ⁇ -glucosyl flavonoid derivatives of the invention can be used for their pharmaceutical use as veinotonic. (K. atsenis, Curr Vase, Pharmacol 2005, 3 (1), 1-9)
- ⁇ - ⁇ -glucosyl flavonoid derivatives of the invention can be used as:
- insect repellent agent see, for this purpose, the documents JP 2002060304, JP 2003104818, Benavente-garcia et al., J. Agric., Food Chem., 1997, 45).
- Tables 1 and 4 illustrate indeed a number of glucansucrases tested in the examples of this text and specifies: column 1: the organism from which the enzyme originates; column 2: the various wild-type enzymes tested as well as the mutated positions of the active site of these wild-type enzymes in the mutated glucan-saccharases also tested; column 3: the specificities of majority bonds during the synthesis of the natural polymer; column 4: the Bibliographical references in which these enzymes, both in wild and mutated forms, have been described in the state of the art.
- a pre-culture of these E. coli strains. coli is carried out for 22 hours at 30 ° C., 700 rpm in 96-well microplates, in 200 ⁇ l of LB culture medium supplemented with 100 ⁇ g ml of ampicillin.
- These precultures are in turn used to seed the "deep-well" microplates, each well containing 1 ml per well of self-inducing medium ZYM5052 containing in particular 0.2% (w / v) ⁇ -lactose, 0.05%. % (w / v) D-glucose, 0.5% (w / v) glycerol and 0.05% (w / v) L-arabinose (Studier et al., 2005).
- the cell suspension is centrifuged for 20 minutes at 3000 g at 4 ° C.
- the cell pellets are resuspended in the 96 well deep well microplates, with 300 ⁇ l of phosphate buffered saline (24 mM sodium phosphate / potassium and 274 mM NaCl) containing 0.5 g L lysozyme and 5 mg / L Bovine pancreatic RNAse.
- the centrifuged cell lysates containing the recombinant enzymes are transferred into clean deep-well 96-well microplates.
- the enzymatic extracts obtained are used to conduct the enzymatic flavonoid glucosylation screening reactions.
- the enzymatic activity of each centrifuged cell lysate is evaluated in microplate format, in final weight after 30 minutes of incubation in the presence of 146 m final sucrose, by determination of reducing sugars by 3,5-dinitrosalicylic acid (DNS). Finally, after dilution in ultrapure water, Tabsorbance is read at 540 nm.
- the flavonoid acceptor reactions are then carried out in "deep-well” microplates, in a volume of 300 ⁇ , at final concentrations, of sucrose of 146 mM, flavonoid of 2.5 mM (apigenin) or 5 mM ( naringenin) (initially dissolved in 100% DMSO), and 140 ⁇ l of centrifuged cell lysate.
- the final concentration of DMSO in the reaction medium is 3% (v / v).
- Incubation is conducted at 30 ° C and 700 rpm. After 24 hours, the enzymes are denatured at 95 ° C for 15 minutes. These microplates are stored at -80 ° C for rapid evaluation of flavonoid glucosylation by liquid chromatography coupled with mass spectrometry (HPLC-MS or LC-MS).
- reaction media are extensively homogenized diluted l / c 30 in DMSO.
- the separation of the flavonoids and their glucosylated forms is carried out in inverse phase with a ProntoSIL Eurobond® 53x3.0 mm 120-3-C18-AQ column (porosity of 120 ⁇ , particle size of 3 ⁇ , C 18 grafting, Bischoff Chromatography, Germany).
- the mobile phase is composed of an ultrapure water mixture (Solvent A) / LC-MS grade acetonitrile (solvent B) each containing 0.05% (v / v) of formic acid.
- solvent A ultrapure water mixture
- solvent B LC-MS grade acetonitrile
- Ionization in mass spectrometry on MSQ Plus equipment is performed in electrospray positive (ESI +) mode for apigenin and negative (ESI-) for naringenin.
- the voltage of the capillary is set at 3000 V, that of the cone at 75 V.
- the temperature of the source block is fixed at 450 ° C.
- the LC-MS / MS system used for high-resolution mass spectrometry or MS / MS fragmentation analysis includes an Ultimate 3000 (Dionex) chromatographic separation system coupled to a linear trap / Orbitrap hybrid mass spectrometer (LQT Orbitrap). Thermo Fischer Scientific). The ionization in mass spectrometry on the equipment LQT Orbitrap is this time carried out either in electrospray mode positive (ESI +) or in negative mode (ESI-).
- EXAMPLE 2 Determination of rapigenin glucosylation efficiencies by recombinant amylosaccharase of N. polysaccharea and its variants
- Table 2 illustrates the glucosylation efficiency, during microplate screening, of apigenin for the wild-type form of ASNp (N. polysaccharea recombinant amylosaccharase) as well as for its 174 mutants at its active site.
- ASNp WT mutation positions of the wild-type enzyme
- abscissa the amino acid substituting the one present in the sequence of the wild-type enzyme.
- column 2 was obtained using an enzyme mutated at position 226 by the substitution of the amino acid R (Arginine) with the acid amine A (Alanine).
- Each cell represents a single mutation at positions R226, 1228, F229, A289, F290, 1330, V331, D394 and R446 or a double mutation, that is, two simple mutations at two of these positions.
- the gray bar in each box shows the level of glucosylation efficiency compared to the most effective mutant.
- the 3 double mutant variants are shown in Table 2.
- the glucosylation efficiencies obtained for R226R, I228I, F229F, A289A, F290F, I330I, V331V, D394D and R446R given in Table 2 are also in the range of 0.5 ⁇ 0.5.
- ASNp I228F 9.9%; ASNp I228L: 11.1%; ASNp I228M: 5.4%; ASNp F229A: 5.6%; ASNp F229N: 5.7%; ASNp A289W: 22.1%; ASNp F290C: 5.4%; and ASNp F290K: 8.9%.
- Glucan saccharases of the GH70 family tested for their activity of glucosylation of apigenin are listed in Table 4.
- Table 4 illustrates the glucan saccharases of the GH70 family (glycoside hydrolase 70) tested in the examples of this text.
- ASR C-APY-del WT represents the truncated form of ASR (alternansucrase)
- DSR-S vardelA4N WT represents the wild truncated form DSR-S (dextransucrase)
- DSR-S vardelA4N F353T represents the truncated form of the DSR-S mutated at position 353 by the substitution of the amino acid F (phenylalanine) with the amino acid T (Threoninc).
- Glucosylation results of apigenin by glucan saccharases of the GH70 family are reported in Table 5.
- Table 5 illustrates the glucosylation efficiency of apigenin for the wild form of the truncated DSR-S variant (vardelA4N WT), for the truncated wild type of PASR (ASR C-APY-del WT), for the wild-type form. of the enzyme ⁇ -1, 2 BrS, and for seven mutants of DSR-S vardelA4N.
- the gray bar in each box shows the level of glucosylation efficiency compared to the most effective mutant. While the wild form of the truncated variant of DSR-S
- saccharose hydrolysis activities of the wild-type enzymes were taken as references for calculating the relative activities of sucrose hydrolysis of their respective mutants.
- the mutants show lower sucrose activity alone than wild-type enzymes, the glucosylation efficiencies of these same mutants are 10- to 44-fold higher than for wild-type enzymes. More generally, the correlation coefficient between the glucosylation efficiencies of apigenin and the hydrolysis activities of sucrose, calculated for the set of mutant enzymes of the amylosucrase of N. polysaccharea, is 0.08. This illustrates the interest of the process for identify enzymes that are not very active on sucrose alone but capable of glucosylating the flavonoids of the invention.
- the nine mutants mentioned in Example 4 can be classified into 6 categories according to the profile of glucosylation products obtained in LC-MS.
- the superposition of the UV chromatograms (X 3 40 nm) for a representative of each of these 6 categories of profiles (respectively ASNp A289W, DSR-S (vardelA4N S512C), ASNp F290K, ASNp F290C, ASNp F229N and ASNp I228F) is presented in Figure 2
- the wild-type enzyme has a very low glucosylation efficiency on Papigenine
- the F290K mutant has a more complex product profile than that of the F290C mutant.
- the glucosylation product of Papigenin produced by the DSR-S vardelA4N S512C enzyme mutant is a monoglucosylated form (FIG. 13) whose retention time is 4.23 min, and whose m / z ratio in electrospray positive mode was was determined at 433.1 19 ( Figure 1).
- LC-MS / MS analysis in the negative electrospray mode of this monoglucosylated form produced by DSR-S vardelA4N S512C led to the identification of two major ions whose m / z ratios were determined at 269.0451 and 268.9360 ( Figure 15). , thus making it possible to support obtaining an O-glucosylation at the 4 'position of the B-ring of apigenin.
- the ASNp A289W enzyme glucosyl Papigenin to give a monoglucosylated product whose retention time is 4.25 min ( Figure 10) and whose m / z ratio in electrospray positive mode was determined at 433.1 120 ( Figure 16) .
- This analysis also showed that the peak of glucosylation product eluting at 3.68 min (FIG. 10) corresponds to a diglucosylation of apigenin.
- the m / z ratio in electrospray positive mode was determined at 595, 1645 ( Figure 17).
- LC-MS / MS analysis in negative electrospray mode reveals that two diglucosylated forms of apigenin co-elute at 3.68 min.
- Example 7 Determination of the glucosylation efficiencies of naringenin by recombinant TV-Vylosaccharase. polysaccharea and its variants
- the glucosylation efficiency of the flavonoid was determined from the formula set forth in Example 2.
- the flavonoid glucosylation efficiencies, expressed as a percentage, were calculated from the peak areas of the various products analyzed, as described in US Pat. Example 1, by HPLC equipped with a UV detector ( ⁇ 340 nm), after 24 hours of reaction. The values obtained are reported in Table 3.
- Table 3 illustrates the glucosylation efficiency, during microplate screening, of naringenin for the wild-type form of ASNp (N. polysaccharea recombinant amylosaccharase) as well as for the 174 mutants of its active site.
- ASNp WT mutation positions of the wild-type enzyme
- abscissa the amino acid substituting the one present in the sequence of the wild-type enzyme.
- column 2 was obtained using an enzyme mutated at position 226 by the substitution of the amino acid R (Arginine) with the acid amine A (Alanine).
- Each cell represents a single mutation at positions R226, 1228, F229, A289, F290, 1330, V331, D394 and R446 or a double mutation, that is, two simple mutations at two of these positions.
- the gray bar in each box shows the level of glucosylation efficiency compared to the most effective mutant.
- sixteen mutant enzymes stand out more particularly from the screening. Seven of these mutant enzymes in particular have a naringenin glucosylation efficiency greater than 20% and two of them have an efficiency greater than 50%.
- the glucosylation efficiencies for these sixteen mutated enzymes are respectively: ASNp R226H: 13.5%; ASNp R226N: 16.0%; ASNp R226S: 14.1%; ASNp I228A: 70.2%; ASNp I228C: 30.9%; ASNp I228S: 16.4%; ASNp I228V: 12.3%; and ASNp A289C: 27.8%; ASNp A2891: 11.2%; ASNp A289N: 14.5%; ASNp A289P: 10.3%; ASNp A289V: 21.8%; ASNp F290R: 1 1, 2%; ASNp F290V: 21, 1%; ASNp A289P / F290C: 50.9%; ASNp A289P / F290L: 22.9%.
- the glucosylation of naringenin illustrates the interest of using directed engineering enzymes for the glucosylation of weakly recognized acceptors such as flavonoids.
- Example 8 Determination of glucosylation efficiencies of naringenin by glucansucrases of the GH70 family
- Glucan saccharases of the GH70 family tested for their activity of glucosylation of apigenin are listed in Table 4.
- the glucosylation results of naringenin by the glucan saccharases of the GH70 family are reported in Table 6.
- Table 6 illustrates the glucosylation efficiency of naringenin for the wild form of the truncated DSR-S variant (vardelA4N WT), for the truncated wild form of ASR (ASR C-APY-del WT), for the form of the enzyme ⁇ -1, 2 BrS and for seven mutants of DSR-S vardelA4N.
- the gray bar in each box shows the level of glucosylation efficiency compared to the most effective mutant.
- the wild form of the ASR truncated variant (ASR C-APY-del WT) has a glucosylation efficiency of 27.1%.
- the wild-type enzyme ⁇ -1, 2 BrS has a naringenin glucosylation efficiency of 26.8%.
- the eighteen mutants with a naringenin glucosylation efficiency greater than 10% discussed in Examples 7 and 8 can be classified into seven categories according to the profile of glucosylation products, obtained in LC-MS.
- the superposition of the UV chromatograms ( ⁇ 340 nm) for a representative of each of these seven categories of profiles is presented in Figure 3.
- the wild-type enzyme ( Figure 20) has a reduced glucosylation efficiency on naringenin (4.7%). Indeed, if one compares the naringenin standard with the final products of the glucosylation reaction, the appearance on the UV chromatogram of several peaks, low intensities, of glucosylated naringenin ( Figure 20) is detected.
- the reaction conditions are as follows: final concentration of 146 mM sucrose, 5 mM naringenin (initially dissolved in 150 mM DMSO), PBS buffer pH 7.2, 0.528 pM ASNA p / mL and ultrapure water qs 145 mL .
- the reaction is conducted with stirring at 30 ° C for 24 h.
- the enzyme is thermally inactivated.
- the reaction mixture is stored at -20 ° C.
- a pre-purification step is carried out by solid phase extraction (SPE) on a cartridge containing 5 g of Cl 8 stationary phase. After conditioning of the column, the centrifuged reaction mixture is deposited on the column and percole by gravity.
- SPE solid phase extraction
- the elution is carried out with methanol.
- the eluate is dried under a stream of nitrogen gas before being taken up in 100% DMSO at a concentration of 100 g / l.
- the different glucosylated forms of naringenin are separated at room temperature by semi-preparative HPLC-UV on a Waters equipment.
- a column Cl 8 250 x 10 mm provided with a precolumn makes it possible to separate the different glucosylated forms of naringenin with a mobile aqueous phase at 0.05% (v / v) of acid formic with a gradient of acetonitrile (B).
- the different steps of the gradient are as follows: 0 min, 22% B; 1 min, 22% B; 17 min, 25% B; 21 min, 29% B; 21.5 min, 95% B; 24.5 min, 95% B; 25 min, 22% B; 27.5 min, 22% B.
- the elution fractions are collected in an automated manner. The purity of the elution fractions is evaluated by LC-UV-MS with an analytical column Cl 8 250 ⁇ 4.6 mm (gradient described above).
- the elution fractions containing a monoglucosylated form of 96% pure naringenin, eluting at a retention time of 18.4 min in semi-preparative HPLC-UV, are combined and dried using GeneVac equipment.
- the product is then solubilized in 300 of deuterated methanol, dried under a stream of nitrogen gas and then lyophilized for 48 hours.
- the identified compound is 4'-O- ⁇ -D-glucopyranosylnaringenin.
- the coupling constant 3 JH-i. H-2 of the anomeric H1- proton of the glucosyl residue is 3.4 Hz.
- mutants glucosylate this flavonol more efficiently than the wild-type enzyme, namely W403G, W403S-F404L, W403V, W403C, W403F, F431 I-D432E-L434I, F431L, A430E-F431L, W403F-F404I, W403C-F404I, W403N-F404Y, W403N-F404H, W403I-F404Y and W403L-F404L.
- the glucosylation efficiencies obtained for these mutants are shown in Table 7.
- mutants glucosylate the morin with a glucosylation efficiency greater than or equal to 30% (mutants W403G, W403S-F404L, W403V, W403C, W403F, F4311-D432E-L434I, F431L, A430E-F431L and W403F-F404I ).
- Two mutants even have a morin glucosylation efficiency greater than or equal to 40% or even 45% (mutants W403S-F404L and W403G).
- the best glucosylation efficiencies were obtained with the mutants W403S-F404L (49.5%) and W403G (66.7%).
- Glucosylation products from the morine were detected by LC-UV-MS ( Figure 31).
- a mono-glucosyl compound, two diglucosyl compounds and a triglucosyl compound have been identified.
- the best mutant for the glucosylation of the morine is the W403G variant which synthesizes four times more di-glucosylated morine than the wild-type enzyme.
- Naringenin is glucosylated by ANi 2 3-GBD-CD2 WT with a glucosylation yield of 13.9 ⁇ 4.7% (Table 8).
- Naringenin is low in glucosylated by the wild enzyme (14%) and the essential is monoglueosylated (13%).
- a variant of the W403-F404 library shows an increase in the production of the mono-glucosylated product. up to 49% with the mutant W4031-F404Y.
- a variant (W403S-F404L) converts 10% of the naringenin into a triglucosyl compound (versus only 1% for the wild-type enzyme).
- the number indicated in each box is the percentage of glucosylation efficiency.
- the number indicated in each box is the percentage of glucosylation efficiency
- SEQ ID NO: 10 (Protein - mutated truncated glucansucrase sequence DSR-S vardelMN ' - S512C)
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| FR1452461A FR3018821A1 (fr) | 2014-03-24 | 2014-03-24 | Nouveaux flavonoides o-alpha-glucosyles sur le cycle b, procede d'obtention et utilisations |
| FR1456417A FR3018822B1 (fr) | 2014-03-24 | 2014-07-03 | Nouveaux flavonoides o-alpha-glucosyles sur le cycle b, procede d'obtention et utilisations |
| PCT/EP2015/056307 WO2015144731A1 (fr) | 2014-03-24 | 2015-03-24 | NOUVEAUX FLAVONOÏDES O-α-GLUCOSYLÉS SUR LE CYCLE B, PROCÉDÉ D'OBTENTION ET UTILISATIONS |
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| CN106565654B (zh) * | 2016-10-14 | 2018-08-31 | 云南中烟工业有限责任公司 | 一种从白云参中提取的新型黄酮类化合物、其制备方法及其用途 |
| CN107382938B (zh) * | 2017-07-26 | 2020-09-22 | 云南中烟工业有限责任公司 | 一种能改善卷烟抽吸喉部舒适性的黄酮类化合物及其制备方法与应用 |
| CN107721961B (zh) * | 2017-09-07 | 2020-08-25 | 云南中烟工业有限责任公司 | 一种从芦荟中提取的黄酮类化合物及其制备方法和应用 |
| CN107721960B (zh) * | 2017-09-07 | 2020-08-25 | 云南中烟工业有限责任公司 | 一种从山楂中提取的黄酮类化合物及其制备方法和应用 |
| CN107759552B (zh) * | 2017-09-07 | 2020-08-25 | 云南中烟工业有限责任公司 | 一种具有抗氧化活性的黄酮类化合物及其制备方法和应用 |
| CN107778275B (zh) * | 2017-10-18 | 2020-08-25 | 云南中烟工业有限责任公司 | 一种从玫瑰废渣中提取的异黄酮类化合物及其制备方法和应用 |
| CN107759554B (zh) * | 2017-10-18 | 2020-08-25 | 云南中烟工业有限责任公司 | 一种羟丙基异黄酮类化合物及其制备方法和应用 |
| CN107903234B (zh) * | 2017-10-18 | 2020-08-25 | 云南中烟工业有限责任公司 | 一种从木瓜中提取的异黄酮类化合物及其制备方法和应用 |
| KR102105412B1 (ko) * | 2018-06-20 | 2020-04-29 | 한국원자력연구원 | 항암 활성을 갖는 크로만 화합물 및 이를 유효성분으로 포함하는 암 예방 및 치료용 약학 조성물 |
| CN109456292B (zh) * | 2018-10-23 | 2022-06-10 | 中山大学 | 一种海洋真菌来源的香豆素类化合物及其制备方法与应用 |
| CN110205351A (zh) * | 2019-05-23 | 2019-09-06 | 广东金骏康生物技术有限公司 | 一种糖基化柚皮素的制备方法及其应用 |
| CN112410321B (zh) * | 2020-11-26 | 2022-01-28 | 昆明理工大学 | 一种β-葡萄糖苷酶Ttbgl3及其应用 |
| CN114807159B (zh) * | 2021-12-23 | 2023-09-29 | 西藏自治区农牧科学院农业研究所 | 一种与耐旱性相关的c-糖基黄酮代谢基因及其用途 |
| CN115478026B (zh) * | 2022-06-29 | 2023-07-04 | 中南大学 | 一种耐辐射球菌及其应用 |
| US20250255332A1 (en) * | 2022-08-23 | 2025-08-14 | Givaudan Sa | Compositions comprising aromadendrin 3-acetate |
| WO2025198996A1 (fr) * | 2024-03-19 | 2025-09-25 | Danisco Us Inc. | Procédé d'amélioration du goût dans un produit alimentaire |
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| JPH11225840A (ja) | 1998-02-12 | 1999-08-24 | Miyagen:Kk | 管脚ノンスリップカバー、およびその製造法 |
| JP2001046096A (ja) * | 1999-08-09 | 2001-02-20 | Lotte Co Ltd | α−グルコシダーゼによる配糖体の製造方法及び新規なα−グルコシダーゼ並びにその製造方法 |
| JP4947608B2 (ja) | 2000-06-05 | 2012-06-06 | 株式会社コシイプレザービング | フラボノイド誘導体の抽出方法 |
| JP2003104818A (ja) | 2001-07-26 | 2003-04-09 | Nippon Fine Chem Co Ltd | フラボノイド配糖体を含有する害虫防除剤 |
| CN1960700A (zh) | 2004-03-30 | 2007-05-09 | 荷兰联合利华有限公司 | 含维生素和类黄酮的亮肤组合物 |
| KR100716797B1 (ko) * | 2004-12-03 | 2007-05-14 | 전남대학교산학협력단 | 당전이 효소를 이용한 당전이 화합물의 유도체 제조방법 및 이로부터 제조된 유도체 |
| US20100227826A1 (en) | 2005-12-07 | 2010-09-09 | Mercier Michel F | Stable Flavonoid Solutions |
| EP1867729A1 (fr) | 2006-06-14 | 2007-12-19 | Libragen | Derivés phénoliques solubles dans l'eau avec des utilisations thérapeutiques et dermocosmetiques |
| CN100569077C (zh) | 2007-01-24 | 2009-12-16 | 四川大学 | 一种狼毒黄酮混配杀虫剂及其制备方法 |
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| TW200915583A (en) | 2007-09-17 | 2009-04-01 | Univ Nat Taiwan Science Tech | Photoelectric electrodes capable of absorbing solar energy, fabrication methods, and applications thereof |
| EP2100966A1 (fr) | 2008-03-12 | 2009-09-16 | Institut Pasteur | Mutants de glycoside hydrolases et leurs utilisations dans la synthèse d'oligosaccharides complexes et disaccharides intermédiaires |
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| GERWIN H. MEULENBELD ET AL: "Transglycosylation byStreptococcus mutans GS-5 glucosyltransferase-D: Acceptor specificity and engineering of reaction conditions", BIOTECHNOLOGY AND BIOENGINEERING, vol. 70, no. 4, 1 January 2000 (2000-01-01), pages 363 - 369, XP055589722, ISSN: 0006-3592, DOI: 10.1002/1097-0290(20001120)70:4<363::AID-BIT1>3.0.CO;2-2 * |
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| FR3018821A1 (fr) | 2015-09-25 |
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| FR3018822A1 (fr) | 2015-09-25 |
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