WO2024208878A1 - Procédé de fonctionnalisation d'un support solide avec un conjugué peptidique - Google Patents
Procédé de fonctionnalisation d'un support solide avec un conjugué peptidique Download PDFInfo
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- WO2024208878A1 WO2024208878A1 PCT/EP2024/059023 EP2024059023W WO2024208878A1 WO 2024208878 A1 WO2024208878 A1 WO 2024208878A1 EP 2024059023 W EP2024059023 W EP 2024059023W WO 2024208878 A1 WO2024208878 A1 WO 2024208878A1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
- A01P1/00—Disinfectants; Antimicrobial compounds or mixtures thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
Definitions
- the present invention relates to the field of functionalization of surfaces, such as textile or plastic surfaces, by peptides, in particular antimicrobial peptides.
- biofilms have traditionally been treated with the use of antibiotics, but this massive use of antibiotics has contributed to the emergence of strains that have developed resistance to antibiotics. It is therefore necessary today to develop alternative methods to the use of disinfectants and antibiotics to eliminate biofilms and/or limit their appearance.
- Antimicrobial coatings can be obtained by functionalizing the surfaces with molecules having antimicrobial properties.
- Patent application WO20I41I8779 describes, for example, a method for functionalizing surfaces with bifunctional molecules comprising a catechol anchor and a peptide part comprising a difluorophenylalanine dipeptide.
- the functionalization aims to confer antifouling properties to the surface, in particular preventing the formation of biofilms on the surface.
- the catechol anchor allows grafting onto the surfaces by adsorption. Such grafting is less robust than covalent grafting.
- peptide conjugates should advantageously be adaptive, so that they can be used in a wide range of applications and with a wide range of peptides.
- functionalization methods with peptide conjugates in which the nature of the peptide, its distance from the anchoring head, and its position of attachment to the anchoring head in particular can be controlled and/or adapted.
- peptide conjugates comprising a benzophenone-type anchoring head, a spacer arm and a peptide fragment that can be attached to the spacer arm by different locations of its structure.
- This functionalization is particularly suitable for plastic and/or textile type supports.
- the present invention relates to a method for functionalizing at least one surface of a solid support, comprising bringing at least said surface of said solid support into contact with at least one peptide conjugate of formula (I) in which L is a spacer arm, n is 0 or 1, preferably 1, and
- A is a peptide fragment, under conditions suitable for obtaining the anchoring of at least one peptide conjugate of formula (I) to the surface of the support.
- A is a peptide fragment comprising from 2 to 80 amino acids, preferably from 3 to 30 amino acids, in particular from 7 to 20 amino acids.
- A is a peptide fragment selected from the group consisting of an antibiotic peptide, an antimicrobial peptide, an antifungal peptide, an anti-inflammatory peptide, a catalytic peptide, a biological receptor ligand peptide, an antibody and an enzyme inhibitory peptide, preferably an antimicrobial peptide, or a fragment thereof.
- the peptide fragment is an antimicrobial peptide selected from the group consisting of peptides H-(RF)4-NH2 (SEQ ID NO:2), H-(RI)4-NH2 (SEQ ID NO:4) and H-(R) 2 -Palm.
- L is a carbon aliphatic chain of formula (II) , in which m is an integer from 1 to 10, preferably from 4 to 6, in particular 5.
- the solid support is selected from the group consisting of a plastic support and a textile support.
- the functionalization method comprises the following steps: a. Contacting at least said surface of said solid support with a solution or suspension of at least one peptide conjugate of formula (I) as defined above in a solvent, the contacting preferably being carried out by dipping, spraying and/or incubation; b. Irradiation, in particular UV irradiation, of the surface in contact with the solution or suspension of the at least one peptide conjugate of formula (I), for a duration suitable for obtaining the grafting of all or part of the peptide conjugate of formula (I) onto the surface; and c. Rinsing all or part of the at least one surface of the solid support with a solvent.
- the method further comprises at least one step chosen from the following steps: a step (i), before step (a) of contacting, of activating the at least one surface, preferably implemented by thermal activation, chemical activation and/or by irradiation;
- step (i’) before step (a) of contacting, of cleaning the at least one surface
- the present invention also relates to a solid support, at least one surface of which is coated with at least one peptide conjugate capable of being obtained, preferably obtained, by the functionalization method according to the invention.
- the present invention also relates to the use of a solid support according to the invention for the manufacture of nanoparticles for diagnosis, for the functionalization of Elisa plates, for the manufacture of antifouling surfaces, for the manufacture of medical devices and/or for the manufacture of technical textiles.
- Figure 1 shows the percentages of inhibition of the two bacteria Escherichia coli and Staphylococcus aureus obtained by depositing peptide conjugates according to the invention on polycarbonate plates. Top left, conjugate Ia, top right, conjugate 1b, bottom left conjugate Ia and bottom right conjugate 1b.
- Figure 2 is the photo showing the fluorescence of the 3 wells of the plate functionalized in example 3.
- a “spacer arm” is a chemical group comprising at least one atom, preferably 1 to 10 atoms.
- a “peptide fragment” is a chain of at least two amino acids linked together by peptide and/or pseudopeptide bonds.
- the peptide fragment comprises from 2 to 80 amino acids, preferably from 2 to 40 amino acids, preferably from 3 to 40 amino acids, preferably from 3 to 30 amino acids, preferably from 4 to 30 amino acids, preferably from 4 to 20 amino acids, in particular from 7 to 20 amino acids.
- amino acid is a molecule comprising at least one carboxylic acid function. (COOH) and an amine function, and at least one carbon atom connecting this carboxylic acid function and this amine function.
- the amino acids used in the present invention may in particular be natural and/or synthetic amino acids.
- Naturally occurring amino acids include, but are not limited to, the following amino acids: glycine (Gly, G), alanine (Ala, A), valine (Val, V), leucine (Leu, L), isoleucine (Ile, I), serine (Ser, S), threonine (Thr, T), phenylalanine (Phe, F), tyrosine (Tyr, Y), tryptophan (Trp, W), cysteine (Cys, C), methionine (Met, M), proline (Pro, P), aspartic acid (Asp, D), asparagine (Asn, N), glutamine (Gin, Q), glutamic acid (Glu, E), histidine (His, H), arginine (Arg, R), and lysine (Lys, K).
- the preferred natural amino acids according to the present invention are the L-series amino acids.
- Synthetic amino acids are any amino acids that are not naturally occurring. They include in particular the following amino acids: beta-alanine, allylglycine, tert-leucine, norleucine, 3-aminoadipic acid, 2-aminobenzoic acid, 3-aminobenzoic acid, 4-aminobenzoic acid, 2-aminobutanoic acid, 4-amino-1-carboxymethyl piperidine, 1-amino-1-cyclobutanecarboxylic acid, 4-aminocyclohexaneacetic acid, 1-amino-1-cyclohexanecarboxylic acid, (IR,2R)-2-aminocyclohexanecarboxylic acid, (IR,2S)-2-aminocyclohexanecarboxylic acid, (IS,2R)-2-aminocyclohexanecarboxylic acid, (IS,2S)-2-aminocyclohexanecarboxylic acid, 3-amino
- side chain represents the moiety carried by the alpha carbon of an amino acid.
- side chains of naturally occurring amino acids such as glycine, valine, alanine, and aspartic acid correspond to the hydrogen atom, isopropyl, methyl, and CH2COOH groups, respectively.
- amino acid side chain may be included in the definition of an amino acid side chain, such as those of the following amino acids: 4-amino tetrahydropyran-4-carboxylic acid, allylglycine, diamino butyric acid, diamino propionic acid, aminoserine, aminobutyric acid, amino butylglycine, phenylglycine, 4-chloro-phenylalanine, 4-fluoro-phenylalanine, 4-nitro-phenylalanine, citrulline, cyclohexylalanine, thienylalanine, and the like.
- amino acids such as those of the following amino acids: 4-amino tetrahydropyran-4-carboxylic acid, allylglycine, diamino butyric acid, diamino propionic acid, aminoserine, aminobutyric acid, amino butylglycine, phenylglycine, 4-chloro-phenylalanine, 4-fluor
- the side chains of amino acids can be protected by protective groups (P) and more particularly N-protective, O-protective or S-protective when these chains contain the corresponding heteroatoms.
- P protective groups
- the protection of some of the reactive functions peptides is mandatory during the synthesis of said peptides.
- Protective groups (P) are groups known to those skilled in the art. These protective groups and their use are described in works such as, for example, Greene, “Protective Groups in Organic Synthesis”, Wiley, New York, 2007, 4th edition; Harrison et al. "Compendium of Synthetic Organic Methods", Vol. 1 to 8 (J. Wiley & Sons, 1971 to 1996).
- N-protecting groups N-protecting groups
- S-protecting groups S-protecting groups
- O-protecting groups O-protecting groups
- a hydroxyl can be protected by a trityl group, or a carboxylic acid can be protected in the form of a tert-butyl ester.
- a resin that serves as a protective group for the C-terminal carboxylic function.
- the protection of the amino group (i.e. the "alpha amine") of the amino acid can be carried out, for example, by a tert-butyloxycarbonyl group (Boc-) or a 9-fluoro-renylmethyloxycarbonyl group (Fmoc-). The protection is carried out according to methods known in the art.
- the amino acids obtained are synthetic until the protective group(s) are removed, thereby releasing the so-called natural amino acid.
- the removal of the protective group(s) is also carried out according to methods known in the art.
- a “solid support” or “substrate” is an object of which at least one surface is solid, and of which at least this surface can be functionalized by the invention.
- plastic means a support or surface comprising a mixture containing a base material which is a polymer, or a mixture of polymers.
- the plastic support or surface may have been obtained by molding, extrusion or shaping, preferably hot and under pressure, of said mixture comprising a polymer.
- the term "textile” designates an assembly of threads or fibers, advantageously joined together or between them, forming a solid and insoluble entity.
- the textile may be a fabric, advantageously obtained by weaving or knitting threads, or a nonwoven obtained by assembling fibers.
- the textile material may be in particular a fabric, or a synthetic material such as a plastic material.
- textile includes in particular textiles medical, civil textiles, technical textiles and filtration membranes.
- “functionalization” or “anchoring” is meant the covalent or non-covalent attachment of at least one peptide conjugate to the surface of the solid support, preferably by means of the attachment, in particular the covalent attachment, of the benzophenone unit of the conjugate to said surface.
- degree of functionalization is meant the quantity or density of peptide conjugate of formula (I) which is anchored to the surface of the solid support functionalized according to the invention.
- the peptide conjugate used in the functionalization process according to the invention is a conjugate of formula (I) where L is a spacer arm, n is 0 or 1, and A is a peptide fragment.
- the presence of this spacer arm can in particular make it possible to move the steric hindrance away from the surface when the peptide fragment is bulky, for example when it comprises side chains.
- L is an aliphatic carbon chain of formula (II) in which m is an integer from 1 to 10, preferably 4 at 6, especially 5.
- the ends of the spacer arm L which are respectively attached to the benzophenone and to the peptide fragment A are typically made up of functional groups allowing the attachment of the different entities by chemical reactions well known in the art, such as peptide bond formation reactions.
- the linkage between the spacer arm L and the peptide fragment A is at the N-terminus of the peptide fragment A. In another embodiment, the linkage between the spacer arm L and the peptide fragment A is at the C-terminus of the peptide fragment A. In another embodiment, the linkage between the spacer arm L and the peptide fragment A is at a side chain of the peptide fragment A.
- the peptide conjugate comprises a single peptide moiety and a single benzophenone head.
- the peptide conjugate may comprise a single peptide moiety and multiple benzophenone heads, for example, 2, 3, 4, or 5 benzophenone heads preferably linked to different positions on the peptide moiety.
- the peptide fragment may comprise from 2 to 80 amino acids, preferably from 2 to 40 amino acids, preferably from 3 to 40 amino acids, preferably from 3 to 30 amino acids, preferably from 4 to 30 amino acids, preferably from 4 to 20 amino acids, in particular from 7 to 20 amino acids.
- the peptide fragment A is not the GRGDSP fragment (SEQ ID NO: 1).
- the peptide fragment A is not the RGD fragment.
- the peptide fragment A is neither the GRGDSP fragment (SEQ ID NO: 1) nor the RGD fragment.
- peptide fragment A does not comprise any amino acid capable of reacting with benzophenone, such as methionine and/or tryptophan.
- peptide fragment A is an unmodified peptide.
- the peptide fragment is a modified peptide, for example, a peptide whose end(s) not linked to the spacer arm is (are) substituted and/or protected by a protecting group.
- the COOH terminus of the peptide may be substituted by a fatty acid, such as palmitic acid.
- peptide fragment A is selected from the group consisting of a linear natural peptide strand, a linear synthetic peptide strand, a linear protected natural peptide strand, a linear protected synthetic peptide strand, a linear natural pseudopeptide strand, a linear synthetic pseudopeptide strand, a linear pseudopeptide strand natural protected linear peptide strand, and a synthetic protected linear pseudopeptide strand.
- peptide fragment A is selected from the group consisting of a cyclic natural peptide fragment, a cyclic synthetic peptide fragment, a cyclic protected natural peptide fragment, a cyclic protected synthetic peptide fragment, a cyclic natural pseudopeptide fragment, a cyclic synthetic pseudopeptide fragment, a cyclic protected natural pseudopeptide fragment, and a cyclic protected synthetic pseudopeptide fragment.
- the peptide fragment A of the peptide conjugate of formula (I) may comprise one or more peptides, peptide strands and/or peptide fragments as described in the present description.
- the peptide fragment A is selected from the group consisting of the peptides H-(RF) 4 -NH 2 (SEQ ID NO: 2), H-(RI) 4 -NH 2 (SEQ ID NO: 4) and H-(R) 2 -Palm, Palm designating a modification of the terminal arginine by a palmitic acid.
- the peptide fragment A has a particular property, in particular a particular chemical or biological activity.
- the peptide fragment A can be chosen from the group consisting of an antibiotic peptide, an antimicrobial peptide, an antifungal peptide, an anti-inflammatory peptide, a catalyst peptide, a biological receptor ligand peptide, an antibody and an enzyme inhibitor peptide.
- the peptide fragment A is chosen from the group consisting of an antibiotic peptide, an antimicrobial peptide, an antifungal peptide, an anti-inflammatory peptide and a catalyst peptide.
- the peptide fragment A is chosen from the group consisting of an antibiotic peptide, an antimicrobial peptide and an antifungal peptide.
- peptide fragment A is an antimicrobial peptide, preferably a cationic antimicrobial peptide, with an overall positive charge and comprising at least one hydrophobic residue.
- the particular property of the peptide fragment A is advantageously not affected by its grafting to the spacer arm and to the benzophenone head, this particular property is therefore also a particular property of the corresponding peptide conjugate.
- the particular property of the peptide conjugate is advantageously not affected by its anchoring on the surface of the solid support, this particular property is therefore also a particular property of the functionalized surface of the corresponding solid support.
- peptide fragment A is an antimicrobial peptide selected from the group consisting of peptides H-(RF) 4 -NH 2 (SEQ ID NO: 2), H-(RI) 4 -NH 2 (SEQ ID NO: 4) and H-(R)2-Palm, Palm denoting a modification of the terminal arginine by a palmitic acid.
- the peptide conjugate is selected from the group consisting of the conjugate defined by SEQ ID No. 3 and the conjugate defined by SEQ ID No. 5.
- the peptide conjugates according to the invention can be synthesized by any suitable technique known in the art, in particular by successive couplings of the spacer arm with the benzophenone and with the peptide fragment A.
- the peptide conjugate and the peptide fragment A can in particular be synthesized by conventional peptide synthesis techniques.
- Peptide synthesis is conventionally carried out by activating the carboxylic acid function of an amino acid, or of an amino acid chain, by using a coupling agent. This activated acid is placed in the presence of an amino acid, or of an amino acid chain, whose terminal amine is not protected, thus resulting in the formation of an amide bond, also called a peptide bond.
- the coupling conditions as well as the coupling agents used are very well known to those skilled in the art and described for example in works such as Greene, "Protective Groups in Organic Synthesis", Wiley, New York, 2007 4th edition; Harrison et al.
- the functionalization method according to the invention applies to at least one surface of a solid support.
- the surface functionalized by the method according to the invention is the total surface of the solid support. In another preferred embodiment, the surface functionalized by the method according to the invention is only a part of the total surface of the solid support.
- the solid support may be any material benefiting from functionalization by the peptide conjugate of formula (I). It may in particular be a plastic support or a textile support, preferably a plastic support.
- the functionalization of the at least one surface of the solid support makes it possible to confer the same property on at least one surface of the support.
- the method is carried out with a single peptide conjugate of formula (I). In other embodiments, the method is carried out with at least two different peptide conjugates, either one after the other or as a mixture. For example, the method can be carried out with at least two peptide conjugates comprising two different peptide fragments, or with at least two peptide conjugates comprising the same peptide fragment but different spacer arms, in particular spacer arms of different lengths.
- the contacting of the at least one surface with the at least one peptide conjugate of formula (I) can be carried out by any suitable technique.
- the contacting can be carried out by dipping, spraying and/or incubation of the at least one surface with a solution or suspension of the peptide conjugate of formula (I) in a solvent.
- the solvent can be an organic solvent, an inorganic solvent, or a mixture of such solvents.
- the solvent can in particular be an alcohol, such as ethanol.
- the peptide conjugate of formula (I) is soluble in the solvent used.
- the techniques of spin-coating, dip-coating, casting, laminar flow deposition and aerospray deposition can be mentioned.
- the duration of contact may correspond to the time required for the total evaporation of the solvent in which the conjugate is dissolved and/or suspended.
- the functionalization process can make it possible to anchor on the surface of the solid support at least one layer, preferably a monolayer, of the peptide fragment(s) of the peptide conjugate(s) of formula (I).
- the functionalization method according to the invention comprises the following steps, preferably in this order: a. Contacting at least said surface of said solid support with a solution or suspension of at least one peptide conjugate of formula (I) in a solvent, the contacting preferably being carried out by soaking, spraying and/or incubation; b. Irradiation of the surface in contact with the solution or suspension of at least one peptide conjugate of formula (I), for a duration suitable for obtaining the anchoring of all or part of the peptide conjugate of formula (I) on the surface; and c. Rinsing all or part of the at least one surface of the solid support with a solvent.
- Step a. of contacting can be implemented as described above for the contacting step.
- Irradiation step b. allows in particular the activation of the benzophenone head of the peptide conjugate of formula (I) and its anchoring on the surface of the solid support. Preferably, this involves irradiation with ultraviolet (UV).
- UV ultraviolet
- Irradiation step b. can be carried out either in the presence of the solvent of the solution or suspension brought into contact with the support in step a., or after evaporation or drying of all or part of the solvent, in particular after evaporation or drying of all the solvent.
- Rinsing step c. makes it possible in particular to remove the excess peptide conjugate of formula (I) which has not anchored to the surface of the solid support at the end of irradiation step b.
- the rinsing can be carried out with a solvent or with several solvents, either simultaneously or one after the other.
- the solvent of rinsing step c. can be an organic solvent, an inorganic solvent or a mixture of such solvents.
- the rinsing step can be carried out once or several times, in particular 2, 3, 4, 5 or 10 times, with the same solvent or with different solvents.
- rinsing step c. makes it possible to remove all of the peptide conjugate of formula (I) which is not anchored to the surface at the end of step b.
- the functionalization method further comprises, before step a. of contacting, a step (i) of activating the at least one surface.
- This activation step makes it possible in particular to improve the subsequent anchoring of the peptide conjugate of formula (I) to the surface, for example by increasing the anchoring speed and/or by increasing the degree of functionalization.
- the nature of the activation to be implemented depends on the nature of the surface of the solid support. This activation may in particular be a thermal activation, by exposure to a temperature above room temperature (15 to 25°C), a chemical activation, by contacting with a chemical agent allowing activation, and/or an activation by irradiation.
- the functionalization method further comprises, before step a.
- a step (i') of cleaning the at least one surface aims to remove any substance present on the surface and which could prevent or weaken the subsequent functionalization by the peptide conjugate(s).
- the cleaning step (i') can be carried out for example using a solvent such as an alcohol, in particular ethanol or isopropanol.
- the functionalization method further comprises, after the rinsing step c., a centrifugation step (ii), preferably also comprising the separation of the pellet and the centrifugation supernatant, the solid support being in the centrifugation pellet.
- a centrifugation step (ii) preferably also comprising the separation of the pellet and the centrifugation supernatant, the solid support being in the centrifugation pellet.
- the functionalization method further comprises, after the rinsing step c., and after the centrifugation step (ii) if present, an aging step (iii).
- Step (iii) may in particular be a reduced pressure aging step (under vacuum) and/or a heating aging step at a temperature above room temperature.
- step (iii) comprises reduced pressure aging followed by heating aging.
- Another object of the present invention is a solid support of which at least one surface is coated with at least one peptide conjugate, capable of being obtained, preferably obtained, by the functionalization method according to the invention.
- only one surface of the solid support is functionalized by a functionalization method according to the invention.
- at least two surfaces of the solid support, preferably all surfaces of the solid support are functionalized by a functionalization method according to the invention.
- only a portion of the surface of the solid support is functionalized by a functionalization method according to the invention.
- 100% of the surface of the solid support is functionalized by a functionalization method according to the invention.
- less than 100%, less than 90%, less than 80%, less than 70%, less than 60%, less than 50%, less than 40%, less than 30%, less than 20%, less than 10% or less than 5% of the surface of the solid support is functionalized by a functionalization method according to the invention.
- the solid support according to the invention and/or the solid support capable of being obtained, preferably obtained, by a functionalization process according to the invention, can be used in a wide variety of applications.
- Possible uses include the manufacture of nanoparticles for diagnosis, the functionalization of Elisa plates, the manufacture of antifouling surfaces, the manufacture of medical devices and/or the manufacture of technical textiles.
- a final object of the invention is the use of a solid support according to the invention, of a solid support obtained or capable of being obtained by a functionalization process according to the invention, and/or of a functionalization process according to the invention, for the manufacture of nanoparticles for diagnosis, for the functionalization of Elisa plates, for the manufacture of antifouling surfaces, for the manufacture of medical devices and/or for the manufacture of technical textiles.
- Peptides are synthesized on solid support using a Symphony X peptide synthesizer (Protein Technologies, Inc., USA) in Fmoc/tert-butyl strategy using nitrogen bubbling as a stirring method for the coupling cycles and deprotection of Fmoc groups in the N-terminal position or in solution in Boc/Bzl strategy.
- the syntheses were performed at a 0.25 mmol scale on Fmoc-Rink-Amide polystyrene resin (481 mg/0.52 mmol/g) or 2-chlorotrityl chloride (892 mg, 0.28 mmol/g).
- the standard deprotection-coupling cycle for each residue consisted of six steps: Wash the resin with 5 mL of dimethylformamide DMF (3 x 30 sec). Deprotection of the Fmoc group with 5 mL of 20% piperidine in DMF (3 x 3 min). Wash the resin with 5 mL of DMF (3 x 30 sec).
- Cleavage of the resin is performed 2 x 60 minutes in a cleavage cocktail (trifluoroacetic acid TFA/triisopropylsilane TIS/water H2O 95/2.5/2.5) for the deprotected sequences and 2 x 60 minutes in a cleavage cocktail (acetic acid AcOH/2,2,2-Trifluoroethanol TFE/dichloromethane DCM 10/20/70) for the protected sequences (2-chlorotrityl chloride resin).
- a cleavage cocktail trifluoroacetic acid TFA/triisopropylsilane TIS/water H2O 95/2.5/2.5
- a cleavage cocktail acetic acid AcOH/2,2,2-Trifluoroethanol TFE/dichloromethane DCM 10/20/70
- the precipitated peptide is centrifuged (3500 RCF) and the supernatant is removed. (X3).
- the peptide in the form of TFA salts is then solubilized in a water ftO/acetonitrile ACN mixture before being frozen and lyophilized.
- Peptides are analyzed by UPLC chromatography and ESI-MS mass spectrometry, equipped with a BEH C18 column (WATERS), 150*2.1 mm (150 x 2.1 mm) (flow rate: 0.6 ml/min).
- Solvents A and B are 0.1% TFA in water and 0.1% TFA in acetonitrile.
- Peptide purification was performed on a WATERS HPLC 4000 equipped with a 486 UV detector and a Vydac Denali 10 pm C18 120 ⁇ column (310 x 25 mm) at a flow rate of 50 mL/min.
- the solvents used were 0.1% TFA in water (buffer A) and 0.1% TFA in acetonitrile (buffer B).
- Example 1a Peptide conjugate comprising the peptide H-4-NH2 (SEQ ID NO:2)
- the antibacterial peptide H-(RF)4-NH2 (SEQ ID No. 2) was synthesized on a Rink Amide resin (loading 0.52 mmol/g, synthesis scale: 0.25 mmol) using the Fmoc/tBu strategy. Each coupling was followed by deprotection of the Fmoc group at the N-terminus. The peptide was then functionalized on a support after introduction of a spacer (or “linker”).
- the Fmoc-Ahx-OH spacer (6-hexanoic amino acid protected by a Fmoc group) was introduced into DMF in the presence of 3 equivalents of HATU and 6 equivalents of DIEA, the resin was washed (3*DMF, 1*methanol MeOH and 1*dichloromethane DCM). 4-Benzoylbenzoic acid was coupled in DMF in the presence of 3 equivalents of HATU and 6 equivalents of DIEA, the resin was washed (3 * DMF, 1 * MeOH and 1 * DCM). The resin was then cleaved in a mixture of DCM / TFA / H2O 50/47.5/2.5 for 2X1 h.
- the “cleavage” solution was concentrated under reduced pressure and then the antibacterial anchor peptide was precipitated in diethyl ether and finally purified by preparative HPLC (Vydac Denali 10 pm C18 120 ⁇ column (310 x 25 mm) using a gradient of 20 to 60% of buffer B in 40 min.).
- Example lb Peptide conjugate comprising the peptide H-(RI)4-NH2 (SEQ IP No. 4)
- the antibacterial peptide H-(RI)4-NH2 (SEQ ID No. 4) was synthesized on a Rink Amide resin (loading 0.52 mmol/g, synthesis scale: 0.25 mmol) using the Fmoc/tBu strategy. Each coupling was followed by deprotection of the N-terminal Fmoc group. The peptide was then functionalized on a support after introduction of a spacer (or "linker"). The Fmoc-Ahx-OH spacer was introduced into DMF in the presence of 3 equivalents of HATU and 6 equivalents of DIEA, the resin was washed (3*DMF, 1*MeOH and 1*DCM).
- the antibacterial peptide H-(R)2-Palm was synthesized on a Rink resin (loading 0.52 mmol/g, synthesis scale: 0.25 mmol) previously functionalized by a benzotriazole in Fmoc/tBu strategy. Each coupling was followed by deprotection of the Fmoc group at the N-terminal.
- the Rink-amide resin was pretreated with piperidine (20% in DMF) and washed (3*DMF, 1*MeOH and 1*DCM).
- 4-Amino 3-nitrobenzoic acid was coupled in DMF in the presence of 3 equivalents of HATU and 6 equivalents of DIEA.
- the reaction was left stirring for 2 h and then the resin was washed (3*DMF, 1*MeOH and 1*DCM), capped with acetic anhydride (15 ml of a 10% v/v solution in DCM) and then washed (2*DCM, 3*DMF, 1*MeOH and 1*DCM).
- the reduction of the nitro group was carried out in a solution of 5 g of SnCh(2H2O) and 900 ⁇ L of 1,8-diazabicyclo[5.4.0]undec-7-ene DBU per 10 ml of DMF which was added to the resin under nitrogen bubbling for 10 minutes. The reaction was stirred for 15 h, syringe opened and washed (3*DMF, 3*DCM).
- the introduction of the peptide sequence -(R)2- was carried out using the Fmoc/tBu strategy. Each coupling was followed by deprotection of the Fmoc group at the N-terminus. The peptide was then functionalized on a support after introduction of a spacer (or "linker").
- the Fmoc-Ahx-OH spacer was introduced into DMF in the presence of 3 equivalents of HATU and 6 equivalents of DIEA, the resin was washed (3*DMF, 1*MeOH and 1*DCM).
- the peptide was then deprotected in a DCM/TFA/H2O 50/47.5/2.5 mixture for 2x1 h.
- the “deprotection” solution was concentrated under reduced pressure and the antibacterial peptide was precipitated in diethyl ether and finally purified by preparative HPLC (Vydac Denali 10 pm C18 120 ⁇ column (310 x 25 mm) using a gradient of 20 to 60% buffer B in 40 min).
- the deposition of the three peptides obtained in example 1 was carried out by dip-coating, that is to say by dipping/removal at a constant speed of the substrate in a solution of the anchor peptide in an ethanolic solution.
- Each peptide was solubilized in an ethanolic solution (95%).
- Example 3 Grafting of benzophenone onto a support
- the fluorescent dansyl-benzophenone block of formula below was synthesized by conventional techniques.
- a 96-well polystyrene plate was previously rinsed with distilled water and ethyl alcohol, then dried.
- a 0.1M solution of dansyl-benzophenone compound was deposited in the first three wells.
- the plate was irradiated for 180 seconds under UV at a power of 120 mW/cm 2 .
- the plate was then rinsed with distilled water.
- Figure 2 shows a photo of the plate, which shows fluorescence of the 3 functionalized wells.
- Example 4 Determination of the antibacterial activity of substrates treated with antimicrobial peptides according to the invention
- Antibacterial activity according to ISO 22196:2011 is intended to assess the anti- microbial activity of plastic products or non-porous surfaces treated with antimicrobial agents.
- the method used in this study focuses only on the evaluation of antibacterial activity.
- This study is intended to evaluate the antibacterial activity of peptide-grafted polycarbonate materials compared to the reference without treatment according to the recommendations of the ISO 22196:20111 standard for a contact time of 24 hours.
- Such a study ideally uses 5 cm x 5 cm samples on which a known concentration of the microorganism to be tested has been deposited. After incubation for 24 hours at 35°C, the quantity of viable microorganisms is assessed by the agar medium enumeration technique. Comparison of the bacterial concentrations obtained between the treated and untreated material makes it possible to define the antibacterial activity of the tested formulation.
- Each conjugate 1a, 1b and 1c as synthesized in Example 1 was deposited on the surface of the polycarbonate plates by depositing a solution of 0.02 to 4 mg/mL.
- Table 1 corresponds to Staphylococcus aureus
- Table 2 corresponds to Escherichia coli.
- PC denotes polycarbonate.
- Peptide conjugates are designated by reference to the example in which their synthesis is described (1a, 1b and 1c).
- Figure 1 illustrates these results.
- a significant inhibition of the 2 types of bacteria was obtained (up to 99.87% reduction in growth for Staphylococcus aureus, and up to 97.0% reduction in growth for Escherichia coll) for the polycarbonate samples functionalized according to the invention compared to the non-functionalized polycarbonate samples.
- the antibacterial activity of the peptide conjugates 1a, 1b and 1c is therefore efficiently transferred to the polycarbonate support on which they are grafted.
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| WO2014118779A1 (fr) | 2013-01-31 | 2014-08-07 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. | Matériaux antisalissures |
Non-Patent Citations (6)
| Title |
|---|
| EDWARDS-GAYLE CHARLOTTE J. C. ET AL: "Selective Antibacterial Activity and Lipid Membrane Interactions of Arginine-Rich Amphiphilic Peptides", vol. 3, no. 2, 17 February 2020 (2020-02-17), US, pages 1165 - 1175, XP093083138, ISSN: 2576-6422, Retrieved from the Internet <URL:http://pubs.acs.org/doi/pdf/10.1021/acsabm.9b00894> DOI: 10.1021/acsabm.9b00894 * |
| GREENE: "Protective Groups in Organic Synthesis", 2007, WILEY |
| HARRISON ET AL.: "Compendium of Synthetic Organic Methods", vol. 1-8, 1971, J. WILEY & SONS |
| HOUBEN-WEYL: "Methods of Organic Chemistry, Synthesis of Peptides and Peptidomimetics", vol. 22a,22b,22c,22d, 2002, GEORG THIEME VERLAG |
| MAO CANWEI ET AL: "UV mediated attachment of short Arginine-Tryptophan antimicrobial peptides on reverse osmosis membrane surfaces inhibitPseudomonas aeruginosabiofilm", DESALINATION, ELSEVIER, AMSTERDAM, NL, vol. 431, 20 December 2017 (2017-12-20), pages 73 - 79, XP085350554, ISSN: 0011-9164, DOI: 10.1016/J.DESAL.2017.12.027 * |
| PAUL LLOYD- WILLIAMSFERNANDO ALBERICIOERNEST GIRALT: "Chemical Approaches to the Synthesis of Peptides and Proteins", 1997, CRC PRESS |
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