WO2017213520A1 - Peptides pour l'inhibition d'une infection parasitaire - Google Patents

Peptides pour l'inhibition d'une infection parasitaire Download PDF

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Publication number
WO2017213520A1
WO2017213520A1 PCT/NO2017/050151 NO2017050151W WO2017213520A1 WO 2017213520 A1 WO2017213520 A1 WO 2017213520A1 NO 2017050151 W NO2017050151 W NO 2017050151W WO 2017213520 A1 WO2017213520 A1 WO 2017213520A1
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Prior art keywords
seq
peptide
accordance
animal
parasite
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PCT/NO2017/050151
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English (en)
Inventor
Scott Mckinley
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Aqua Health As
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Priority claimed from NO20160995A external-priority patent/NO345090B1/no
Priority claimed from NO20162073A external-priority patent/NO343281B1/en
Priority claimed from NO20170778A external-priority patent/NO343723B1/en
Application filed by Aqua Health As filed Critical Aqua Health As
Priority to CA3026200A priority Critical patent/CA3026200C/fr
Priority to DK17737651.4T priority patent/DK3468988T3/da
Priority to EP17737651.4A priority patent/EP3468988B1/fr
Publication of WO2017213520A1 publication Critical patent/WO2017213520A1/fr
Priority to DKPA201870824A priority patent/DK180659B1/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/81—Protease inhibitors
    • C07K14/8107—Endopeptidase (E.C. 3.4.21-99) inhibitors
    • C07K14/811—Serine protease (E.C. 3.4.21) inhibitors
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
    • C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/64—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
    • C12N9/6421—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
    • C12N9/6424—Serine endopeptidases (3.4.21)
    • C12N9/6427—Chymotrypsins (3.4.21.1; 3.4.21.2); Trypsin (3.4.21.4)
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2319/00—Fusion polypeptide
    • C07K2319/20—Fusion polypeptide containing a tag with affinity for a non-protein ligand
    • C07K2319/21—Fusion polypeptide containing a tag with affinity for a non-protein ligand containing a His-tag
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2319/00—Fusion polypeptide
    • C07K2319/50—Fusion polypeptide containing protease site

Definitions

  • the present invention relates to peptides and pharmaceutical compositions comprising such peptides for inhibiting the infestation and infection of a parasite to an animal.
  • the parasite is a caligid copepod on a salmonid
  • the invention also provides a feed for for the prevention and/or treatment of infections in salmonids caused by sea lice.
  • Sea lice present a large economic burden for fish farmers. Sea lice are obligate ectoparasitic copepods on the external surface of marine fish.
  • the term sea lice commonly refer to are Lepeophtheirus salmonis and Caligus rogercresseyi. L. salmonis affects inter alia wild and farmed salmon and the rainbow trout industry in
  • L. salmonis The life cycle of L. salmonis consists of 10 different stages and lasts 7-8 weeks at 10°C.
  • Naupilus and copepodid are free swimming and non-parasitic stages, and chalimus, pre adult and adult lice are attached and parasitic stages.
  • a characteristic feature of attachment and feeding sites of caligid copepods on many of their hosts is that a trypsin-like activity is secreted by L. salmonis onto the salmon skin. It is believed that it is used by the sea lice to feed on the salmon mucus, skin and blood and to protect the sea lice from the salmon immune response.
  • the salmon louse, L. salmonis is known to secrete a number of proteases upon parasitic infection of its host Salmo salar.
  • a trypsin-like serine protease appears to be the major protease secreted by the louse. This enzyme may provide a potential drug target for treatment of L. salmonis infection in farmed salmon. Based on the modelled 3D structure of the L.
  • LsTrypl salmonis trypsin-1 protein
  • 11 peptides have been designed with an amino acid sequence that should allow specific binding to LsTrypl and inhibition of its protease activity.
  • LsTrypl activity of these peptides against recombinant LsTrypl that has been expressed in E. coli.
  • a first aspect of the invention relates to a peptide for use in inhibiting the infestation or attachment of a parasite on an animal, or for the prevention and/or treatment of infections of parasite on an animal, wherein said peptide is administered to said parasite and/or animal, wherein the peptide comprises an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10 and variants thereof being at least 70% identical over the entire sequence with any of the sequences SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10 .
  • amino acid sequence SEQ ID NO 3 and variants thereof being at least 70% identical over the entire sequence with SEQ ID NO 3.
  • amino acid sequence SEQ ID NO 5 and variants thereof being at least 70% identical over the entire sequence with SEQ ID NO 5.
  • amino acid sequence SEQ ID NO 10 and variants thereof being at least 70% identical over the entire sequence with SEQ ID NO 10.
  • said animal a domestic animal, farm animal or a pet.
  • said animal is a fish.
  • said parasite an ectoparasite.
  • said animal a salmonid and said parasite is a caligid copepod for the prevention and/or treatment of infections in salmonids caused by sea lice, wherein said peptide is administered to said caligid copepod and/or said salmonid, wherein the peptide comprises an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10.
  • the peptide comprises an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10.
  • inhibits aid peptide a trypsin protease protein from a Caligidae.
  • peptide administered to said salmonid by injection.
  • peptide administered to said salmonid orally is the peptide administered to said salmonid orally.
  • a second aspect of the present invention relates to a pharmaceutical composition for use in inhibiting the infestation or attachment of a parasite on an animal, or for the prevention and/or treatment of infections of parasite on an animal, wherein said pharmaceutical composition is administered to said parasite and/or animal, wherein said pharmaceutical composition comprises a peptide having a sequence of amino acid sequences selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10 and variants thereof being at least 70% identical over the entire sequence with any of the sequences SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10 .
  • SEQ ID NO 3 amino acid sequence
  • variants thereof being at least 70% identical over the entire sequence with SEQ ID NO 3.
  • amino acid sequence SEQ ID NO 5 and variants thereof being at least 70% identical over the entire sequence with SEQ ID NO 5.
  • amino acid sequence SEQ ID NO 10 and variants thereof being at least 70% identical over the entire sequence with SEQ ID NO 10.
  • said animal in a preferred embodiment is said animal a domestic animal, farm animal or a pet.
  • said animal in a preferred embodiment is said animal a fish.
  • said parasite an ectoparasite.
  • said animal a salmonid and said parasite is a caligid copepod for the prevention and/or treatment of infections in salmonids caused by sea lice, wherein said pharmaceutical composition is administered to said caligid copepod and/or said salmonid, wherein the peptide comprises an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10.
  • a trypsin protease protein from a Caligidae.
  • composition administered to said salmonid by injection.
  • a third aspect of the present invention relates to a feed composition comprising conventional feed ingredients such as proteins, fat and carbohydrates, wherein said feed composition comprises a peptide with an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10 and variants thereof being at least 70% identical over the entire sequence with any of the sequences SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10 .
  • said feed composition comprises said feed composition a peptide with an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10.
  • SEQ ID NO 5 In a preferred embodiment is said peptide the sequence SEQ ID NO 10.
  • said feed composition fed to an animal, preferably to a domestic animal, farm animal or a pet.
  • said animal in a preferred embodiment is said animal a fish.
  • said fish a salmonoid.
  • said salmonoid selected from the group consisting of Atlantic salmon, coho salmon, Chinook, rainbow trout, and Arctic charr.
  • a fourth aspect of the present invention relates to a feed composition for use in inhibiting the attachment of a parasite to a host and/or infection of a parasite in a host, wherein said feed composition comprises a peptide with an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5, SEQ ID NO 4 or SEQ ID NO 10, and variants thereof being at least 70% identical over the entire sequence with any of the sequences SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10.
  • the feed composition for use in inhibiting the attachment of a parasite to a host and/or infection of a parasite in a host, wherein said feed composition comprises a peptide with an amino acid sequence selected from the group consisting of SEQ ID NO 3, SEQ ID NO 5 or SEQ ID NO 10.
  • peptide the sequence SEQ ID NO 3. In a preferred embodiment is said peptide the sequence SEQ ID NO 5
  • said host an animal such as a domestic animal, farm animal or a pet.
  • said animal in a preferred embodiment is said animal a fish.
  • said fish a salmonoid.
  • said salmonoid selected from the group consisting of Atlantic salmon, coho salmon, Chinook, rainbow trout, and Arctic charr.
  • the parasite an ectoparasite.
  • the parasite a Caligidae.
  • the Caligidae selected from the group consisting of
  • Figure 1 shows a plasmid map of pET40-LsTrypl.
  • Figure 2 shows a portion of the sequencing data for LsTrypl aligned to the expected sequence of pET40-LsTrypl. It shows the P159A mutation, which was the only amino acid change from expected based on published genomic L. salmonis sequence.
  • Figure 1 shows a Western blot for His-tag proteins isolated from BL21 with pET40-LsTrypl (lane 1), pET-40b lacking the LsTrypl gene (lane 2), pET40-LsTrypl without induction of protein expression (lane 3) and protein size ladder (Fermentas; lane 4).
  • Figure 2 shows the analysis of LsTrypl purification.
  • Figure 5a and 5b shows the effect on LsTrypl and rLsTrypl activity by various peptides.
  • Potent serine protease inhibitor, PMSF is included as positive control of trypsin inhibition.
  • Figure 6 shows gelatin zymograph of protease containing extracts from various sources.
  • Figure 7 shows the protease activity of rLsTrp after incubation in S. salar serum over 3 days as a measure of peptide stability in salmon blood. *denotes a statistically significant difference compared to serum without peptide collected at the same time point (p ⁇ 0:05).
  • Figure 8 shows a graph of a number of lice found on control vs. peptide treated salmon from in vivo experiment 1 (high peptide concentration). Observations made 10 days and 21 days post lice exposure. Error bars represent standard deviation.
  • Figure 9 shows a graph of a number of lice found and area of those lice on control vs. peptide treated salmon from in vivo experiment #2 (low peptide concentration). Observations made seven days post lice exposure and 17 days post administration of peptide. Error bars fsize' column only) represent standard error of the mean. * indicates a statistically significant difference (P ⁇ 0:01).
  • E. coli DH10B was used for cloning and production of plasmid DNA. Cultures were grown in ZYM-505 medium at 37°. DNA manipulations were performed using standard procedures. Plasmid DNA was purified using QIAprep Spin Miniprep Kit (Qiagen). E. coli
  • BL21(DE3)pLysS (referred to as BL21 from here on) was used as a protein expression host for LsTrypl.
  • BL21 was routine culture of BL21 was in MDAG-135 and protein expression was performed in auto-induction medium, MDA-5052.
  • Antibiotics kanamycin (Km) and chloramphenicol (Cm) were used at 100 and 33 ⁇ g/mL, where appropriate.
  • RNAlater reagent Qiagen
  • RNA preparation was cleared of any genomic DNA carry-over by DNasel digestion (Fermentas) followed by heat inactivation of the DNasel enzyme.
  • First-strand cDNA synthesis was performed using 1 ⁇ g L. salmonis RNA and M-MulV reverse transcriptase (200 U) primed with an oligo-dT primer in the presence of RNase inhibitor, by manufacturer's instructions (NEB).
  • PCR amplification of the LsTrypl gene was performed with PrimeSTAR GXL DNA Polymerase (Clonetech) using primers F-LsTrypl_3 (5'- gttcccctcagatcaaatactctgag-3') and R-LsTrypl_l (5'-ctattggtgttcagcaatccagtcaatg-3'; IDT) with an annealing temperature of 60°C and 35 cycles.
  • PCR product of the expected size was (672 bps) was confirmed by agarose gel electrophoresis and this product was purified by gel extraction using the NucleoSpin Gel and PCR Clean-up kit (MACHEREY-NAGEL GmbH & Co).
  • PCR product of the LsTrypl gene was ligated into pET-40b expression vector
  • protein from SDS-PAGE was transferred to nitrocellulose membranes and probed with rabbit D -His-tag antibody and IR800 conjugated ⁇ -rabbit IgG antibody (Rockland Immunochemicals Inc.) visualized on an Odyssey CLx IR scanner (LI-COR Biosciences).
  • Protease activity of recombinant LsTrypl protein was assayed using the Pierce Fluorescent Protease Assay Kit by manufactures instructions (Thermo-Fisher Scientific) in 384-well microtitre plate (White, low protein binding assay plate; Greiner Bio-One). Activity of LsTrypl was measured in the presence or absence of each of the peptides of interest.
  • Lyophilized peptides were reconstituted in assay buffer (10 mM tris, pH 7.4) to make stock solutions with a final concentration of 1 mM. Peptides were added to the FITC-casein substrate to a final concentration of 100 ⁇ . Recombinant LsTryp extracted from E. coli
  • BL21 was drop dialyzed on a 0.025 ⁇ , mixed cellulose esters membrane filter against assay buffer for 2 hours then diluted 1 :2 in assay buffer. 35 of this LsTrypl solution was added to 35 ⁇ ⁇ of substrate with or without peptide for a final assay volume of 70 ⁇ h. Lysate extracted from of a culture of BL21 lacking the recombinant LsTrypl gene, but otherwise processed in the same manor to the LsTrypl extraction, was used as baseline to control for possible carryover of endogenous E. coli proteases. Serine protease inhibitor,
  • phenylmethanesulfonyl fluoride was included as a positive control for trypsin inhibition. All test samples were assayed in quadruplicate. Protease digestion was allowed to proceed for 30 minutes after LsTrypl addition before reading output on a SpectraMax M plate reader (Molecular Devices) with an excitation wavelength of 494 nm and emission wavelength of 521 nm. Results
  • PCR of the LsTry l gene with the primer sequences presented above produced a DNA fragment of consistent with the size expected for the PCR using L. salmonis cDNA as a template (672 base pairs).
  • the PCR amplified fragment includes only the enzyme domain and lacks the signal peptide and activation peptide of the natural full-length transcript to avoid problems of improper processing to mature protease in the E. coli host.
  • Insertion of the LsTrypl PCR product into the Seal site of pET-40b results in an in-frame translational fusion of LsTrypl to the upstream DsbC gene, separated by a 6x histidine tag (His-tag) and a thrombin cleavage site.
  • His-tag 6x histidine tag
  • the DsbC gene encodes a periplasm localized disulfide bond isomerase enzyme, which, fused to the LsTrypl protein, should cause it to be excreted to the periplasmic space of E. coli.
  • the periplasm provides a more favorable environment for the proper folding of disulfide bond-rich proteins (there are four disulfide bonds in LsTrypl) as does the enzyme activity of the DsbC fusion partner.
  • the His-tag allows the protein to be purified by immobilized metal ion affinity chromatography (IMAC).
  • IMAC immobilized metal ion affinity chromatography
  • the Dsb-LsTrypl fusion gene in pET40-LsTrypl is downstream of a T7 polymerase promoter and relies on the presence of the T7 RNA polymerase protein to be present in the host cell for transcription.
  • the BL21(DE3)pLysS expression host contains the gene for T7 RNA polymerase, but this gene is under control of the Lac repression (Lacl), which is in a repressed state unless lactose is present and glucose is not. This allows controlled expression of our protease until which time these conditions are met. To limit potential toxic effects of LsTrypl on the host cells, expression is delayed until late in the growth phase.
  • Protein extracts were analyzed for presence of the DsbC-LsTrypl fusion by western immune blot probed with an antibody specific to the 6x His tag epitope located in the linker region between the DsbC and LsTrypl.
  • Figure 3 shows multiple reactive bands corresponding the expected sizes of the fusion protein and trypsin cleavage products of the full-length fusion protein.
  • the full-length product is expected to be a protein of 49.2 kDa.
  • the linker region between DsbC and LsTrypl contains a trypsin cleavage site just a few amino acids up from the start of LsTrypl.
  • Protease activity of recombinant LsTrypl was measured in the presence of 11 potential inhibitory peptides as given in table 1.
  • Two of the 11 peptides (SEQ ID NO 3 (P3) and SEQ ID NO 5 (P5)) displayed an inhibitory activity indistinguishable in magnitude from that of the potent serine protease inhibitor, PMSF, at the same molar concentration.
  • P3 and P5 SEQ ID NO 5
  • Zymography a technique to detect activity of individual proteases in a complex sample, was used to determine the effect of the SEQ ID NO 3 (P3) and SEQ ID NO 5 (P5) mixture on trypsins for other organisms.
  • a lysate of the E. coli strain used to express rLsTrp was used as the LsTrp source, and homogenates of intestines from S. salar and lobster were used as samples containing trypsin from these organisms.
  • Purified bovine trypsin was available as a source of mammalian trypsin. Zymography analysis was done by standard procedures.
  • Proteins of these samples were separated by SDS-PAGE under nonreducing conditions and without first boiling the samples in gels co -polymerized with 0.1% gelatin, which is used as the protease substrate. After electrophoresis SDS was removed from gels so that proteins could renature into their active state by incubation in renaturing buffer in the presence and absence of a peptide mixture of SEQ ID NO 3 (P3) and SEQ ID NO 5 (P5) at 100 ⁇ each for 2 hours. The gels were then fixed stained and destined as described previously for SDS- PAGE. Due to the gelatin present in the gel, the entire gel will stain positive for protein, except for regions were the gelatin has been removed through the action of proteases present within the gel.
  • the zymograph shown in Figure 6 shows light bands of protein clearing in the lane corresponding to rLsTrp in the control gel not exposed peptide, but this clearing was absent in the gel incubated with the inhibitory peptide mixture.
  • the other samples containing proteases from other organisms all showed bands of clearing despite the presence of SEQ ID NO 3 (P3) and SEQ ID NO 5 (P5), suggesting that these peptides do not display inhibitory activity against these proteases.
  • the mixture of serum and peptides was incubated at room temperature with samples removed immediately after addition of peptide then again 1 day, 2 day and 3 days after addition of peptides. Removed portion was passed through a spin column membrane filtration device with a molecular weight cut-off of 10 kDa, which would allow the peptides to pass through (MW of 2.3 and 1.6 kDa for SEQ ID NO 3 (P3) and SEQ ID NO 5 (P5), respectively, while retaining proteins and larger peptides from the serum which should remove any serum peptidases.
  • Salmon serum without peptides added was incubated and collected alongside the peptide and serum mixture, for use as a negative control. Samples were stored at -80°C until the protease assay was performed. Protease assay was performed as described above. Protease activity of rLsTrp in the presence of peptides mixed with salmon serum still show strong inhibitory activity when collected immediately after combining with the serum. Peptides that had been incubated in salmon serum for 1, 2 and 3 days showed a reduced ability to inhibit protease activity of the rLsTrp enzyme at the longer time points.
  • TMS Tetramaleic acid
  • SEQ ID N03 SEQ ID NO 5
  • SEQ ID NO 5 SEQ ID NO 5
  • a control group of an equal number of salmon received sesame oil alone.
  • Each group contained 12 fish for 24 in total.
  • both treatment and control fish were infected with L. salmonis at 650 lice per fish in a single infection tank then and split into separate tanks after an hour of exposure to the copepodites.
  • Three fish from each group were sacrificed and examined for lice presence on the gills and body after 3 days, 10 days and the remaining from each group were observed 21 days post lice exposure.
  • polypeptide peptide
  • protein protein
  • amino acid polymers in which one or more amino acid residue is an artificial chemical mimetic of a corresponding naturally occurring amino acid, as well as to naturally occurring amino acid polymers and non- naturally occurring amino acid polymers.
  • amino acid refers to naturally occurring and synthetic amino acids, as well as amino acid analogs and amino acid mimetic s that function in a manner similar to naturally occurring amino acids.
  • Naturally occurring amino acids are those encoded by the genetic code, as well as those amino acids that are later modified, e.g., hydroxyproline, ⁇ - carboxyglutamate, and O-phosphoserine.
  • Amino acid analogs refers to compounds that have the same basic chemical structure as a naturally occurring amino acid, i.e., an a carbon that is bound to a hydrogen, a carboxyl group, an amino group, and an R group, e.g., homoserine, norleucine, methionine sulfoxide, methionine methyl sulfonium.
  • Such analogs have modified R groups (e.g., norleucine) or modified peptide backbones, but retain the same basic chemical structure as a naturally occurring amino acid.
  • Naturally encoded amino acids are the 20 common amino acids (alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine) as well as pyrrolysine, pyrroline- carboxy-lysine, and selenocysteine.
  • Percentage of sequence identity is determined by comparing two optimally aligned sequences over a comparison window, wherein the portion of the amino acid sequence or polynucleotide sequence in the comparison window may comprise additions or deletions (i.e. , gaps) as compared to the reference sequence (e.g., a polypeptide of the invention), which does not comprise additions or deletions, for optimal alignment of the two sequences.
  • the percentage is calculated by determining the number of positions at which the identical nucleic acid base or amino acid residue occurs in both sequences to yield the number of matched positions, dividing the number of matched positions by the total number of positions in the window of comparison and multiplying the result by 100 to yield the percentage of sequence identity.
  • variant as used herein includes modifications, substitutions, additions, derivatives, analogs, fragments or chemical equivalents of the amino acid sequences disclosed herein that perform substantially the same function as the peptide inhibitors disclosed herein in substantially the same way.
  • Variants of the peptide inhibitors disclosed herein also include, without limitation, conservative amino acid substitutions.
  • a "conservative amino acid substitution” as used herein is one in which one amino acid residue is replaced with another amino acid residue without abolishing the desired function or activity of the peptide inhibitors disclosed herein.
  • Conservative substitutions typically include substitutions within the following groups: glycine, alanine, valine, isoleucine, leucine, aspartic acid, glutamic acid, asparagine, glutamine, serine, threonine, lysine, arginine; and phenylalanine, tyrosine.
  • conserved amino acid substitutions involve replacing one or more amino acids of the polypeptides of the disclosure with amino acids of similar charge, size, and/or hydrophobicity characteristics. When only conserved substitutions are made the resulting variant should be functionally equivalent. Changes, which result in production of a chemically equivalent or chemically similar amino acid sequence, are included within the scope of the disclosure. If the peptide inhibitors of the present disclosure are made using recombinant DNA technology, variants of the peptide inhibitors may be made by using polypeptide engineering techniques such as site directed mutagenesis, which are well known in the art for substitution of amino acids. For example a hydrophobic residue, such as glycine can be substituted for another hydrophobic residue such as alanine.
  • an alanine residue may be substituted with a more hydrophobic residue such as leucine, valine or isoleucine.
  • a negatively charged amino acid such as aspartic acid may be substituted for glutamic acid.
  • a positively charged amino acid such as lysine may be substituted for another positively charged amino acid such as arginine.
  • the phrase "conservative substitution" also includes the use of a chemically derived residue in place of a non-derivatized residue provided that such polypeptide displays the requisite activity.
  • the peptides described herein comprise, consist essentially of, or consist of SEQ ID NO: 3, SEQ ID NO: 5, or SEQ ID NO: 10 and have 1,2 or 3 conservative amino acid substitutions.
  • Variants of the peptide inhibitors of the present disclosure also include additions and deletions to the amino acid sequences disclosed herein.
  • the invention also features a pharmaceutical composition comprising a composition, e.g. a peptide combination, defined herein.
  • the pharmaceutical composition may be a vaccine.
  • a pharmaceutical composition comprises in addition to the peptide or peptide combination, therapeutically inactive ingredients, such as a pharmaceutically acceptable or physiologically acceptable excipient, carrier and/or adjuvants, which are well-known to the person skilled in the art and may include, but are not limited to, solvents, emulsifiers, wetting agents, plasticizers, solubilizers (e.g. solubility enhancing agents) coloring substances, fillers, preservatives, anti-oxidants, anti-microbial agents, viscosity adjusting agents, buffering agents, pH adjusting agents, isotonicity adjusting agents, mucoadhesive substances, and the like. Examples of formulation strategies are well-known to the person skilled in the art.
  • the peptide may be formulated (e.g. mixed together) with immune- modifying agents like adjuvants.
  • the adjuvant may be any conventional adjuvant, including but not limited to oxygen-containing metal salts, e.g. aluminium hydroxide, chitosan, heat- labile enterotoxin (LT), cholera toxin (CT), cholera toxin B subunit (CTB), polymerized liposomes, mutant toxins, e.g. LTK63 and LTR72, microcapsules, interleukins (e.g.
  • the pharmaceutical composition may be formulated for parenteral administration, such as formulated for injection, e.g. subcutaneous and/or intradermal injection. Therefore, in some embodiments, the pharmaceutical composition may be a liquid (i.e. formulated as a liquid), including a solution, a suspension, a dispersion, and a gelled liquid.
  • a liquid pharmaceutical composition may be formed by dissolving a powder, granulate or lyophilizate of a peptide combination described herein in a suitable solvent and then administering to a subject.
  • Suitable solvents may be any solvent having physiologically acceptable properties and able to dissolve the peptide combination in desired concentrations. A desired concentration may depend on the aliquot to be administered (i.e. to be injected) and the desired single dose.
  • a freeze-dried composition may also be formulated into a solid dosage form that is administered for example by the oral route such as by oral mucosa.
  • the pharmaceutical composition may be formulated for oral administration, for example for sublingual administration. Therefore, the pharmaceutical composition may be a solid dosage form, such as a freeze-dried solid dosage form, typically a tablet, a capsule or sachet, which optionally may be formulated for fast disintegration.
  • compositions, methods and uses of the invention are known in the art (see, e.g., Remington : The Science and Practice of Pharmacy (2003) 20th ed., Mack Publishing Co., Easton, PA; Remington's Pharmaceutical Sciences (1990) 18th ed., Mack Publishing Co., Easton, PA; The Merck Index (1996) 12th ed., Merck Publishing Group, Whitehouse, NJ; Pharmaceutical Principles of Solid Dosage Forms ( 1993), Technonic Publishing Co., Inc., Lancaster, Pa.
  • compositions can be formulated to be compatible with a particular route of administration, such as by intradermal or by sublingual administration.
  • pharmaceutical compositions may include carriers, diluents, or excipients suitable for administration by various routes.
  • Exemplary routes of administration for contact or in vivo delivery for which a composition can optionally be formulated include inhalation, intranasal, oral, buccal, sublingual, subcutaneous, intradermal, epicutaneous, rectal, transdermal, or intralymphatic.
  • a composition may take the form of, for example, tablets or capsules, optionally formulated as fast-integrating tablets/capsules or slow-release tablets/capsules.
  • the tablet is freeze-dried, optionally a fast-disintegrating tablet or capsule suitable for being administered under the tongue.
  • the pharmaceutical composition may also be formulated into a "unit dosage form", which used herein refers to physically discrete units, wherein each unit contains a predetermined quantity of a peptide or peptide combination, optionally in association with a pharmaceutical carrier (excipient, diluent, vehicle or filling agent) which, when administered in one or more doses, may produce a desired effect.
  • Unit dosage forms also include, for example, ampules and vials, which may include a composition in a freeze-dried or lyophilized state (a lyophilizate) or a sterile liquid carrier, for example that can be added prior to administration or delivery in vivo.
  • Unit dosage forms additionally include, for example, ampules and vials with liquid compositions disposed therein.

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  • General Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Biotechnology (AREA)
  • Gastroenterology & Hepatology (AREA)
  • Biophysics (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Peptides Or Proteins (AREA)

Abstract

L'invention concerne des peptides qui inhibent la trypsine. L'invention concerne également des compositions pharmaceutiques comprenant lesdits peptides, et l'utilisation desdits peptides et desdites compositions pharmaceutiques pour l'inhibition de l'infestation par les poux de mer et pour la prévention ou le traitement d'infections chez les salmonidés provoquées par les poux de mer.
PCT/NO2017/050151 2016-06-10 2017-06-09 Peptides pour l'inhibition d'une infection parasitaire WO2017213520A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA3026200A CA3026200C (fr) 2016-06-10 2017-06-09 Peptides pour l'inhibition d'une infection parasitaire
DK17737651.4T DK3468988T3 (da) 2016-06-10 2017-06-09 Peptider til inhibering af parasitinfektion
EP17737651.4A EP3468988B1 (fr) 2016-06-10 2017-06-09 Peptides pour l'inhibition d'une infection parasitaire
DKPA201870824A DK180659B1 (en) 2016-06-10 2018-12-19 Peptides for the inhibition of parasite infection, and pharmaceutical compositions and fish feed compositions comprising such peptides, for the inhibition of parasite infection

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
NO20160995 2016-06-10
NO20160995A NO345090B1 (en) 2016-06-10 2016-06-10 Peptides for the inhibition of trypsin and sea lice infestation
NO20162073A NO343281B1 (en) 2016-12-30 2016-12-30 Peptides for the inhibition of trypsin and sea lice infestation.
NO20162073 2016-12-30
NO20170778A NO343723B1 (en) 2016-06-10 2017-05-11 Peptides for the inhibition of trypsin and sea lice infestation.
NO20170778 2017-05-11

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WO2017213520A1 true WO2017213520A1 (fr) 2017-12-14

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PCT/NO2017/050151 WO2017213520A1 (fr) 2016-06-10 2017-06-09 Peptides pour l'inhibition d'une infection parasitaire

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031139A1 (fr) * 1998-11-25 2000-06-02 University Of Bristol Peptide inhibiteur du type de browman-birk
EP2405004A1 (fr) * 2004-07-28 2012-01-11 National Research Council Of Canada Vaccins recombinants contre les copépodes caligides (poux du poisson) et séquences d'antigène associées

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031139A1 (fr) * 1998-11-25 2000-06-02 University Of Bristol Peptide inhibiteur du type de browman-birk
EP2405004A1 (fr) * 2004-07-28 2012-01-11 National Research Council Of Canada Vaccins recombinants contre les copépodes caligides (poux du poisson) et séquences d'antigène associées

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"Pharmaceutical Principles of Solid Dosage Forms", 1993, TECHNONIC PUBLISHING CO., INC.
"Remington : The Science and Practice of Pharmacy", 2003, MACK PUBLISHING CO.
"Remington's Pharmaceutical Sciences", 1990, MACK PUBLISHING CO.
"The Merck Index", 1996, MERCK PUBLISHING GROUP
ANSEL; SOKLOSA: "Pharmaceutical Calculations", 2001, LIPPINCOTT WILLIAMS & WILKINS
JOHNSON S C ET AL: "Molecular cloning of trypsin cDNAs and trypsin gene expression in the salmon louse Lepeophtheirus salmonis (Copepoda: Caligidae)", PARASITOLOGY RESEARCH, SPRINGER VERLAG, BERLIN, DE, vol. 88, no. 9, 1 September 2002 (2002-09-01), pages 789 - 796, XP002252200, ISSN: 0932-0113, DOI: 10.1007/S00436-002-0656-X *
KVAMME B O ET AL: "The cloning and characterisation of full-length trypsins from the salmon louse Lepeophtheirus salmonis", MOLECULAR AND BIOCHEMICAL PARASITO, ELSEVIER SCIENCE PUBLISHERS, AMSTERDAM, NL, vol. 136, no. 2, 1 August 2004 (2004-08-01), pages 303 - 307, XP004582678, ISSN: 0166-6851, DOI: 10.1016/J.MOLBIOPARA.2003.11.017 *
POWELL, M. F; NEWMAN, COMPENDIUM OF VACCINE ADJUVANTS AND EXCIPIENTS
POZNANSKY ET AL.: "Drug Delivery Systems", 1980, pages: 253 - 315
W. MALDONADO-AGUAYO ET AL: "Increasing transcriptome response of serpins during the ontogenetic stages in the salmon louse Caligus rogercresseyi (Copepoda: Caligidae)", MARINE GENOMICS, vol. 15, 1 June 2014 (2014-06-01), AMSTERDAM, NL, pages 55 - 64, XP055404958, ISSN: 1874-7787, DOI: 10.1016/j.margen.2014.04.006 *
YUAN LIU ET AL: "PtSerpin from the swimming crab Portunus trituberculatus, a putative regulator of prophenoloxidase activation with antibacterial activity", FISH AND SHELLFISH IMMUNOLOGY, vol. 39, no. 2, 24 March 2014 (2014-03-24), GB, pages 365 - 371, XP055409180, ISSN: 1050-4648, DOI: 10.1016/j.fsi.2014.05.018 *

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