EP3464556A1 - Production de frambinone par un microorganisme fongique recombinant - Google Patents
Production de frambinone par un microorganisme fongique recombinantInfo
- Publication number
- EP3464556A1 EP3464556A1 EP17732985.1A EP17732985A EP3464556A1 EP 3464556 A1 EP3464556 A1 EP 3464556A1 EP 17732985 A EP17732985 A EP 17732985A EP 3464556 A1 EP3464556 A1 EP 3464556A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microorganism
- tyrosine
- rambinone
- advantageously
- sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/24—Preparation of oxygen-containing organic compounds containing a carbonyl group
- C12P7/26—Ketones
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- 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
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/52—Genes encoding for enzymes or proenzymes
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
- C07C49/20—Unsaturated compounds containing keto groups bound to acyclic carbon atoms
- C07C49/24—Unsaturated compounds containing keto groups bound to acyclic carbon atoms containing hydroxy groups
- C07C49/245—Unsaturated compounds containing keto groups bound to acyclic carbon atoms containing hydroxy groups containing six-membered aromatic rings
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/14—Fungi; Culture media therefor
- C12N1/16—Yeasts; Culture media therefor
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/14—Fungi; Culture media therefor
- C12N1/16—Yeasts; Culture media therefor
- C12N1/18—Baker's yeast; Brewer's yeast
- C12N1/185—Saccharomyces isolates
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- 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
- C12N9/0004—Oxidoreductases (1.)
- C12N9/001—Oxidoreductases (1.) acting on the CH-CH group of donors (1.3)
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- 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
- C12N9/0004—Oxidoreductases (1.)
- C12N9/0071—Oxidoreductases (1.) acting on paired donors with incorporation of molecular oxygen (1.14)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1025—Acyltransferases (2.3)
- C12N9/1029—Acyltransferases (2.3) transferring groups other than amino-acyl groups (2.3.1)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/22—Preparation of oxygen-containing organic compounds containing a hydroxy group aromatic
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/645—Fungi ; Processes using fungi
- C12R2001/85—Saccharomyces
- C12R2001/865—Saccharomyces cerevisiae
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y401/00—Carbon-carbon lyases (4.1)
- C12Y401/01—Carboxy-lyases (4.1.1)
- C12Y401/0108—4-Hydroxyphenylpyruvate decarboxylase (4.1.1.80)
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- C12Y—ENZYMES
- C12Y403/00—Carbon-nitrogen lyases (4.3)
- C12Y403/01—Ammonia-lyases (4.3.1)
- C12Y403/01023—Tyrosine ammonia-lyase (4.3.1.23)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y403/00—Carbon-nitrogen lyases (4.3)
- C12Y403/01—Ammonia-lyases (4.3.1)
- C12Y403/01024—Phenylalanine ammonia-lyase (4.3.1.24)
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y602/00—Ligases forming carbon-sulfur bonds (6.2)
- C12Y602/01—Acid-Thiol Ligases (6.2.1)
- C12Y602/01012—4-Coumarate-CoA ligase (6.2.1.12)
Definitions
- the present invention provides methods for efficiently producing rambinone from tyrosine using fungal microorganisms and adapted culture conditions.
- the raspberry flavor (Rubus idaeus) is related to more than 200 compounds, but frambinone, a natural phenolic compound, is the compound that has the greatest impact, defining its characteristic taste (Klesk et al., 2004, J Agric., Food Chem 52, 5155-61, Larsen et al., 1991, Acta Agric., Scand 41, 447-54). It can also be found in other fruits and vegetables, including peach, apple and rhubarb (Beekwilder et al., 2007, Biotechnol, J. 2, 1270-79). Because raspberries are only present in small quantities in raspberries (1-4 mg per kg of fruit), natural rambinone is of great value (Larsen et al., 1991). As its natural availability is limited, its biotech production is highly desirable.
- Frambinone (CAS No. 5471-51-2), also known as raspberry ketone or 4- (4-hydroxyphenyl) butan-2-one, has the following structure:
- Frambinone can be used in a wide range of applications, including agri-food and cosmetics (as a flavor), agriculture (as a bait / lure for insects) and even health (as a slimming product) or in medicine (as an inhibitor of melanogenesis).
- Frambinone can be obtained from the aromatic amino acid L-tyrosine as an initial substrate via a 4-step biosynthetic pathway ( Figure 1, Beekwilder et al., 2007, Biotechnol, J. 2, 1270-79).
- tyrosine is de-aminated by a tyrosine ammonia lyase (TAL, EC 4.3.1.23) to form coumaric acid.
- CoA ligase (4CL, EC 6.2.1.12), a Coenzyme A (CoA) molecule is grafted onto coumaric acid. Coumaroyl-CoA is then converted by benzalacetone synthase (BAS, EC 2.3.1.212) to 4-hydroxybenzalacetone. This reaction is a decarboxylative condensation and utilizes a malonyl-CoA unit as a co-substrate. The final step is the reduction of 4-hydroxy benzalacetone to frambinone by benzalacetone reductase (BAR, EC 1.3.1.x).
- BAR benzalacetone reductase
- An alternative substrate for frambinone production is coumaric acid, an intermediate of the pathway described above (noted (2) in Figure 1).
- coumaric acid an intermediate of the pathway described above (noted (2) in Figure 1).
- industrial applications are more profitable when tyrosine is implemented rather than coumaric acid.
- L-phenylalanine (denoted (7) in Figure 1) can also be used as a substrate since it can be converted to coumaric acid via cinnamic acid (denoted (8) in Figure 1).
- frambinone formation in plants uses the general route of phenylpropanoids, which begins with phenylalanine (Borejsza-Wysocki and Hrazdina, 1994, Phytochemistry 35, 623-28.).
- the first step is phenylalanine ammonia lyase catalyzed deamination (PAL, EC 4.3.1.24).
- C4H cinnamate 4-hydroxylase
- CPR cytochrome P450 reductase
- GB 2 416 769 describes the possibility of producing rambinone with the aid of a microorganism (in particular bacteria and yeasts) containing a 4CL and BAS coding sequence, at least one being of heterologous source. It may further comprise a sequence encoding BAR, C4H, PAL and / or CHS, the BAR coding sequence being advantageously endogenous.
- a microorganism in particular bacteria and yeasts
- BAS coding sequence at least one being of heterologous source. It may further comprise a sequence encoding BAR, C4H, PAL and / or CHS, the BAR coding sequence being advantageously endogenous.
- GB 2 416 770 Based on the assumption that CHS has BAS activity, GB 2 416 770 describes the possibility of producing benzalacetone and frambinone using a microorganism comprising a 4CL (eg tobacco) coding sequence and CHS (eg raspberry or petunia), at least one being of heterologous source. It may further comprise a coding sequence BAR (eg raspberry), C4H and PAL.
- 4CL eg tobacco
- CHS eg raspberry or petunia
- BAR eg raspberry
- C4H PAL
- CHS * CHS mutated protein
- a range from 1 to 6 should be considered as specifically describing each of the ranges it includes, such as ranges from 1 to 3, 1 to 4, 1 to 5, 2 to 4, from 2 to 6, from 3 to 6, etc., as well as each of the values in this range, for example, 1, 2, 2,7, 3, 4, 5, 5,3 and 6. is worth regardless of the range of the interval.
- isolated should be understood in the context of the invention as synonymous with removed or extracted from its environment or natural state.
- an isolated nucleic acid or peptide is a nucleic acid or a peptide extracted from the natural environment in which it is usually found, whether it is a plant or a live animal, for example.
- nucleic acid or a peptide naturally present in a living animal is not a nucleic acid or an isolated peptide within the meaning of the invention, whereas the same nucleic acid or peptide, partially or completely separated from the other elements present in its natural context is "isolated" within the meaning of the invention.
- An isolated nucleic acid or peptide may exist in a substantially purified form, or may exist in a non-native environment such as, for example, a host cell.
- A refers to adenosine
- C refers to cytosine
- G refers to guanosine
- T refers to thymidine
- U refers to uridine.
- nucleotide sequence encoding an amino acid sequence refers to all the nucleotide sequences that encode the amino acid sequence, including degenerate nucleotide sequences allowing for obtain said amino acid sequence.
- the nucleotide sequence that encodes a protein or RNA or cDNA may optionally include introns.
- coding or “coding for”, “code” or “code for” refer to the property inherent in the specific nucleotide sequences in a polynucleotide, such as a gene, cDNA or AR m, to serve as the matrix for the synthesis of other polymers and macro molecules in biological processes, having either a defined sequence of nucleotides (eg, rRNA, tRNA and mRNA), or a defined sequence of amino acids, and the biological properties that resulting.
- a gene encodes a protein if the transcription and translation of the mRNA corresponding to that gene produces the protein in a cell or other biological system.
- both the coding strand whose nucleotide sequence is identical to the mRNA sequence and which is generally described in the sequence and database listings, the non-coding strand, used as a template for the transcription of a gene or cDNA, may be referred to as coding for the protein or other product of that gene or cDNA.
- nucleic acids are nucleotide polymers.
- nucleic acids and polynucleotides as used in the context of the invention are interchangeable. It is well known in the field of molecular biology and genetic engineering that nucleic acids are polynucleotides, which can be hydrolyzed to monomers. Nucleotides in monomeric form can be hydrolyzed to nucleosides.
- polynucleotide refers, without limitation, to any type of nucleic acid molecule, that is to say nucleic acid molecules obtainable by any means available in the art, including by recombinant means, namely the cloning of nucleic acid sequences from a recombinant library or the genome of a cell, using standard cloning technologies such as PCR, or by synthesis.
- peptide refers to a compound consisting of amino acid residues covalently linked by peptide bonds.
- a protein contains by definition at least two amino acids, without limitation as to the maximum number of amino acids.
- the polypeptides interchangeably include several peptides and / or proteins, which themselves comprise two or more amino acids connected to each other by peptide bonds.
- the term refers to both short chains, which are also commonly referred to in the art as peptides, oligopeptides and oligomers for example, and longer chains, which are generally designated in the art as proteins, of which there are many types.
- Polypeptides include, for example, for example, logically active bio fragments, substantially homologous polypeptides, oligopeptides, homodimers, heterodimers, polypeptide variants, modified polypeptides, derivatives, analogs, fusion proteins, among others.
- the polypeptides include natural peptides, recombinant peptides, synthetic peptides, or a combination thereof.
- homologous and identical refer to sequence similarity or sequence identity between two polypeptides or between two nucleic acid molecules.
- a position in each of the two compared sequences is occupied by the same amino acid base or subunit monomer (for example, when a position in each of the two DNA molecules is occupied by an adenine)
- the molecules are homologous or identical for this position.
- the percentage of identity between two sequences is a function of the number of corresponding positions shared by the two sequences, and corresponds to this number divided by the number of positions compared and multiplied by 100. For example, if 6 out of 10 positions in two sequences matched are identical, so the two sequences are 60% identical.
- a "vector" within the meaning of the invention is a molecular construct which comprises an isolated nucleic acid and which can be used to deliver the isolated nucleic acid into a cell.
- Many vectors are known in the art including, but not limited to, linear polynucleotides, polynucleotides associated with ionic or amphiphilic compounds, plasmids, and viruses.
- the term “vector” designates, for example, an autonomously replicating plasmid or a virus.
- expression vector denotes a vector comprising a recombinant polynucleotide, which comprises expression control sequences operably linked to a nucleotide sequence to be expressed.
- An expression vector comprises, in particular, expression elements acting in cis; other elements for expression that may be provided by the host cell or by an in vitro expression system.
- Expression vectors within the meaning of the invention include all those known in the art, such as cosmids, plasmids (for example naked or contained in liposomes) and viruses (for example lentiviruses, retroviruses, adenovirus and adeno-associated viruses) that incorporate the recombinant polynucleotide.
- promoter as used herein is defined as a DNA sequence recognized by the cell synthesis machinery, or introduced synthetic machinery, necessary to initiate the specific transcription of a polynucleotide sequence.
- promoter / regulatory sequence denotes a nucleic acid sequence, necessary for the expression of the polynucleotide operably linked to the promoter / regulatory sequence.
- this sequence may be the promoter base sequence, while in other cases this sequence may also include an activator sequence and other regulatory elements useful for polynucleotide expression.
- the promoter / regulatory sequence may be, for example, a sequence allowing the expression of the polynucleotide which is specific for a tissue, that is to say preferably occurring in this tissue.
- a "constitutive" promoter is a nucleotide sequence which, when operably linked to a polynucleotide, leads to expression of the polynucleotide in most or all physiological conditions of the cell.
- an "inducible" promoter is a nucleotide sequence which, when operably linked to a polynucleotide, leads to expression of the polynucleotide only when a promoter inducer is present in the cell.
- the present invention relates to a fungal microorganism genetically modified for the production of rambinone, said microorganism having the following characteristics:
- the expression "genetically modified microorganism” means that the microorganism according to the invention is not found in nature and is modified by introduction of new genetic elements and / or by deletion or modification of the genetic elements. endogenous microorganisms. Such a microorganism may be subjected to selection pressure by combining site-directed mutagenesis and culturing in the selection medium.
- the term “genetic element” is used in a manner equivalent to “gene” or “sequence”. It is therefore a nucleic acid sequence, which can have any type of functionality.
- coding sequence in particular coding an enzyme of the synthesis or degradation pathway of interest
- regulatory sequence in particular a promoter or a terminator.
- it can be optimized, that is to say modified to integrate the preferred codons of the host, in this case the fungal microorganism, in which this sequence is to express.
- only the coding sequence of the gene of interest or ORF for "Open Reading Frame" is isolated and implemented.
- the new genetic elements introduced into the microorganism targeted by the invention are so-called exogenous or heterogeneous genetic elements, which may be of a synthetic nature or from other organisms (or sources).
- a microorganism can express exogenous or heterologous genes if they are introduced into said microorganism with all the elements allowing their expression in the host microorganism.
- the endogenous genes may be modified to modulate their expression and / or their activity, for example by introducing mutations into the coding sequences in order to modify the gene product or by modifying the regulatory sequences, for example by introducing heterologous sequences in addition to or instead of the endogenous regulatory sequences.
- the modulation of the endogenous genes may result in overexpression or an increase in the activity of the endogenous gene product or, conversely, a decrease in the expression or activity thereof.
- supernumerary or additional copies of an endogenous gene may also be introduced into the microorganism, thereby increasing the level of expression and thus the activity of the product encoded by the gene.
- Techniques for introducing DNA into a host are well known to those skilled in the art and include permeabilization membranes by applying an electric field (electroporation), thermally (application of a thermal shock) or chemically, for example using lithium acetate.
- the introduced genetic elements can be integrated into the genome of the host, in particular by homologous recombination or chromosomal integration, advantageously using integrative cassettes, or expressed extrachromosomally using plasmids or vectors.
- plasmids advantageously self-replicating, are well known to those skilled in the art, which differ in particular by their origin of replication, their promoter (inducible or constitutive), their marker (for example a resistance to an antibiotic or the ability to grow in a selective medium) and the number of copies per cell.
- the chromosomal integration of genes is done by the so-called modular cassette integration technique ("modular cassette integration"). technical ").
- the integration of the gene or genes is at the HO locus.
- these cassettes are chosen to have ends having homologous sequences, called recombination regions (RR), allowing homologous recombination and integration in the desired order and at the desired position. different cassettes.
- an expression cassette encodes a marker, for example an antibiotic resistance or the ability to grow in a selective medium, to select or identify microorganisms in which the chromosomal integration actually took place.
- an expression cassette comprises the coding or ORF part of a gene of interest, in particular enzymes involved in the raspinone biosynthesis pathway from tyrosine, placed under the control of regulatory sequences, advantageously at the level of minus a promoter and a terminator, which may be the native regulatory sequences of this gene or heterologous sequences chosen for their functionality and / or efficacy in the host microorganism.
- the cassette is a marker cassette, advantageously comprising a dominant marker gene under the control of a promoter and a terminator.
- said cassette comprises at its 5 'and 3' ends regions homologous to the 5 'and 3' regions of the targeted gene, for example 5 'corresponding to the promoter of the target gene and corresponding in 3' to the terminator of the targeted gene.
- the cassette may contain loxP sites for excision of this genome cassette through the action of the recombinase cre.
- suitable markers are genes conferring resistance to antibiotics, which are then introduced into the culture medium of the genetically modified microorganism to ensure the selection and maintenance of the genetic modification.
- Many markers are available to those skilled in the art, for example:
- kanMX4 conferring resistance to geneticin (or G418);
- hphNT1 conferring resistance to hygromycin B
- the ble gene conferring resistance to phleomycin.
- targeting of the introduced genetic element for example by sequencing, by PCR ("Polymerase Chain Reaction") or by hybridization ("Southern blot” or “Northern blot”);
- targeting the product of the targeted gene for example by immunological detection (“Western blot”) or by measuring the activity, for example enzymatic, associated.
- promoters important elements for controlling gene expression are the promoters, placed upstream of the coding sequence whose expression is governed by the promoter.
- the genes can be expressed using inducible or constitutive variable force promoters.
- the promoters used in the context of the invention are constitutive promoters. These promoters may be homologous or heterologous.
- promoters commonly used by those skilled in the art are, for example:
- the promoter of the S. cerevisiae PFK2 gene for example that of sequence SEQ ID NO: 4;
- the promoter of the PGI1 gene of S. cerevisiae for example that of sequence SEQ ID NO: 7
- the promoter of the S. cerevisiae PMA1 gene for example that of sequence SEQ ID NO: 10;
- the promoter of the S. cerevisiae PYK1 gene for example that of sequence SEQ ID NO: 13;
- SEQ ID NO: 15 or S. cerevisiae.
- terminator sequences also called terminators, placed downstream of the coding sequence to be expressed. Again, they may be homologous terminators, from the microorganism in question, or heterologous, namely artificial sequences or terminators from a source other than the host microorganism.
- terminators may be homologous terminators, from the microorganism in question, or heterologous, namely artificial sequences or terminators from a source other than the host microorganism.
- Many terminator sequences are available and known to those skilled in the art, for example:
- the terminator of the Saccharomyces cerevisiae CYC1 gene for example that of sequence SEQ ID NO: 3;
- the terminator of the S. cerevisiae PFK2 gene for example that of sequence SEQ ID NO: 6;
- the terminator of the S. cerevisiae ZWF1 gene for example that of sequence SEQ ID NO: 12;
- the terminator of the S. cerevisiae PYK1 gene for example that of sequence SEQ ID NO: 14;
- fungal microorganism advantageously designates a yeast or a fungus.
- yeast microorganism is understood as a “fungal microorganism strain”.
- the genetically modified fungal microorganism, object of the present invention is obtained from an isolated strain and at least partially characterized.
- yeast means a commercial product obtained through the implementation of a method for producing a yeast strain. Thus, yeasts having different characteristics can be obtained from the same strain, these differences being related to the production method used.
- the invention relates to a yeast strain, in other words a strain belonging to the ascomycete phyla or basidiomycetes.
- the strain belongs to the genus Saccharomycetales, even more advantageously to the families of Debaryomycetaceae, Dipodascaceae or Saccharomycetaceae.
- the strain belongs to the genera Yarrowia, Debaryomyces, Arxula, Scheffersomyces, Geotrichum, Pichia or Saccharomyces. It may for example be species Yarrowia lipolytica, Debaryomyces hansenii or Saccharomyces cerevisiae.
- the strain used for the construction of a strain according to the invention or for the implementation of a method according to the invention is a so-called industrial strain, as opposed to a so-called strain of laboratory.
- the so-called industrial yeast strains are those capable of being produced using industrial substrates as a carbon source.
- said carbon source may be sugar cane molasses or beetroot.
- the microorganism is chosen in connection with at least one of the following characteristics:
- the microorganism that will be genetically modified may have at least one endogenous enzymatic activity involved in the conversion of tyrosine to rambinone. According to a particular embodiment, it is capable of converting 4-hydroxy benzalacetone to rambinone and thus naturally has a BAR activity, as detailed below.
- the microorganism may be chosen for other characteristics of interest, particularly in view of its application in biotechnology (knowledge of the genome, tools available for genetic manipulation, etc.), its metabolism (especially respiratory and lipidic promoting production malonyl-CoA or acetyl-CoA, co-substrates of the synthetic route of rambinone), or conditions of its industrial exploitation (aerobic growth, tolerance to stress and toxic compounds, etc.).
- a microorganism of interest is chosen from the following list: Beauveria bassiana, Candida boidinii, Galactomyces candidum (Geotrichum candidum), Kloeckera saturnus, Kodamaea ohmeri (Pichia ohmeri), Komagataella pastoris (Pichia pastoris), Mucor Nederlandicus (Mucor subtilissimus), Pichia membranifaciens, Schwanniomyces etchellsii (Pichia etchellsii), Torulaspora delbrueckii (Saccharomyces fermentati), Wickerhamomyces anomalus (Hansenula anomala), Yarrowia lipolytica (Candida lipolytica), Saccharomyces cerevisiae, Debaryomyces hansenii.
- it is Saccharomyces cerevisiae, Yarrowia lipolytica or Deb
- Fungal microorganisms of particular interest are, for example, Yarrowia lipolytica or Debaryomyces hansenii.
- a microorganism according to the invention is intended to produce frambinone from tyrosine.
- a microorganism has an improved ability to produce rambinone from tyrosine, especially with respect to the strains already described or with respect to this same microorganism that has not been genetically modified.
- tyrosine is of obvious interest.
- the addition of tyrosine in the culture medium advantageously a fermentation medium, was possible in terms of solubility and did not exhibit any known toxicity.
- the production of frambinone is from exogenous tyrosine to the microorganism according to the invention, preferably by addition in its culture medium.
- the concentration of tyrosine in the culture medium is greater than or equal to 50 mg / l, or even greater than or equal to 100, 150, 200, 250, 300, 350, 400 or even 450 mg / l.
- it is advantageously less than or equal to 1 g / L, or even less than or equal to 950, 900, 850, 800, 750, 700, 650, 600, 550, 500 or even 450 mg / L.
- the invention also relates to the use of a microorganism as defined in the context of the present application for the production of rambinone from tyrosine.
- the levels of production of rambinone by a microorganism that have not yet been reached advantageously a concentration in the culture medium of the microorganism greater than 4 mg / L, more advantageously greater than or equal to 5 , 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or even 20, 25 or 30 mg / L.
- the rambinone remains soluble and shows no toxicity with respect to the microorganisms according to the invention.
- a microorganism according to the invention or used in a process according to the invention is genetically modified to exhibit an ability to produce or synthesize rambinone from tyrosine, or even to have an improved ability to produce or synthesize rambinone from tyrosine.
- the microorganism can naturally have an ability to synthesize frambinone from tyrosine and the genetic modifications made are intended to improve this capacity.
- the microorganism does not naturally have the capacity to synthesize frambinone from tyrosine and the genetic modifications made are intended to confer this capacity.
- TAL tyrosine ammonia lyase activity
- CoA ligase (EC 6.2.1.12), denoted 4CL, capable of catalyzing the grafting of a Coenzyme A (CoA) molecule on coumaric acid to form coumaroyl-CoA;
- BAS benzalacetone synthase activity, labeled BAS, capable of converting coumaroyl-CoA to 4-hydroxybenzalacetone in the presence of malonyl-CoA as a co-substrate;
- the microorganism according to the invention is genetically modified to ensure or improve the production of rambinone from tyrosol.
- the genetic modifications made make it possible to increase at least one of the four enzymatic activities mentioned above. It can for example be:
- TAL the enzymes of the family of lyases having a predominant activity for tyrosine (tyrosine ammonia lyase, EC 4.3.1.23) are rare. Often, it has an affinity for the phenylalanine substrate at least equal to or even greater (phenylalanine / tyrosine ammonia lyase, PAL / TAL, EC 4.3.1.25).
- a TAL enzyme which has no or very little PAL activity so as to avoid the accumulation of the cinnamic acid intermediate which may have some toxicity.
- the selected TAL enzyme has a notorious PAL activity, it may be advantageous to ensure that the microorganism further has a C4H and / or CPR activity, and possibly to modify it to introduce sequences coding for these enzymatic activities. useful for the conversion of cinnamic acid into coumaric acid.
- a cinnamic acid buildup may exert a negative feedback on TAL so that a balanced expression of 4CL may be required.
- the TAL protein encoded by the gene introduced into the microorganism according to the invention has the sequence SEQ ID NO: 18, or a protein sequence exhibiting at least 70%, or even 80, 85, 90, 95 or even 99%> homology or identity with the sequence SEQ ID NO: 18 and having a TAL activity.
- the sequence coding for the TAL protein, introduced into the microorganism according to the invention has the sequence SEQ ID NO: 5, or a sequence exhibiting at least 60%> or even 70, 80, 85, 90, 95 or even 99% identity with the sequence SEQ ID NO: 5. Its expression can be placed under the control of the regulatory sequences SEQ ID NO: 4 and / or SEQ ID NO: 6.
- CoA ligases (4CL; EC6.2.1.12) are found in plants.
- Genes of interest that can be used in the context of the invention are listed in Table 2 below:
- the 4CL protein encoded by the gene introduced into the microorganism according to the invention has the sequence SEQ ID NO: 19, or a protein sequence exhibiting at least 70%, or even 80, 85, 90, 95 or even 99% homology or identity with the sequence SEQ ID NO: 19 and having a 4CL activity.
- the sequence encoding the 4CL protein, introduced into the microorganism according to the invention has the sequence SEQ ID NO: 8, or a sequence exhibiting at least 60%, or even 70, 80, 85, 90 , 95 or even 99% identity with the sequence SEQ ID NO: 8. Its expression can be placed under the control of the regulatory sequences SEQ ID NO: 7 and / or SEQ ID NO: 9.
- the accumulation of coumaryl-CoA generated by the action of 4CL can cause the undesirable formation of phloretic acid and inhibit the TAL activity. It is therefore important that the microorganism according to the invention has a BAS activity (catalyzing the next step in the route of synthesis of rambinone) adapted.
- Benzalacetone synthases (BAS, EC2.3.1.212) are part of the family of PKS (PolyKetone Synthase), which also includes chalcone synthases (CHS, for example involved in the synthesis of naringenin) and stilbene synthases (STS; involved for example in the synthesis of resveratrol). These enzymes accept coumaroyl-CoA and other substrates, and catalyze condensation with malonyl-CoA. Malonyl-CoA is an intermediate in the synthesis of fatty acids and its formation requires ⁇ . While the CHS and STS add three malonyl-CoA units, BAS adds only one. However, the described BAS enzymes also have CHS activity. Genes of interest that can be used in the context of the invention are listed in Table 3 below:
- the BAS protein encoded by the gene introduced into the microorganism according to the invention has the sequence SEQ ID NO: 20, or a protein sequence exhibiting at least 70%, or even 80, 85, 90, 95 or even 99% homology or identity with the sequence SEQ ID NO: 20 and having a BAS activity.
- the sequence coding for the BAS protein, introduced into the microorganism according to the invention has the sequence SEQ ID NO: 11, or a sequence exhibiting at least 60%> or even 70, 80, 85, 90, 95 or even 99% identity with the sequence SEQ ID NO: 11. Its expression can be placed under the control of the regulatory sequences, in particular a promoter of sequence SEQ ID NO: 10 or SEQ ID NO: 13 and or a terminator of sequence SEQ ID NO: 12 or SEQ ID NO: 14.
- At least two BAS coding sequences are introduced into the microorganism according to the invention. Note that they can be placed under the control of different regulatory sequences.
- the final step in the synthesis pathway of rambinone is the reduction of the ⁇ , ⁇ double bond to p-hydroxy benzalacetone, which requires NADPH, catalyzed by benzalacetone reductase (BAR, EC 1.3.1.x). Only two enzymes with this activity have been identified to date. However, some microorganisms have been reported to have endogenous BAR activity such as E. coli and S. cerevisiae (Beckwilder et al., 2007, Biotechnol, J.
- the first enzyme is described in GB 2 416 769: a 309 amino acid protein was isolated from raspberry protein fractions having BAR activity. It has homology with isoflavone reductases (EC 1.3.1.45) and is capable of converting p-hydroxy benzalacetone to frambinone in in vitro assays with purified enzyme.
- Koeduka et al. Biochem Biophys Res Commun 412, 104-108 have identified a ketone / zingerone synthase of R. idaeus that has BAR activity (RiRZS1, Uniprot G1FCG0).
- the purified protein effectively converts p-hydroxy benzalacetone to rambinone in an enzyme test.
- the BAR protein is encoded by a gene introduced into the microorganism according to the invention and it has the sequence SEQ ID NO: 21, or a protein sequence exhibiting at least 70%, or even 80, 85, 90 , 95 or even 99% homology or identity with the sequence SEQ ID NO: 21 and having a BAR activity.
- the sequence coding for the BAR protein, introduced into the microorganism according to the invention has the sequence SEQ ID NO: 2, or a sequence presenting at least 60%, or even 70, 80, 85, 90, 95 or even 99% identity with the sequence SEQ ID NO: 2. Its expression can be placed under the control of the regulatory sequences, in particular sequences SEQ ID NO: 1 and / or SEQ ID NO: 3.
- the fungal microorganism according to the invention naturally lacks at least one enzymatic activity among 4CL and BAS, or even 2.
- the fungal microorganism according to the invention comprises at least one heterologous sequence encoding the enzyme 4-coumarate: CoA ligase (4CL) or benzalacetone synthase (BAS), advantageously the 4CL and BAS enzymes.
- said sequence encodes a 4CL enzyme having the sequence SEQ ID NO: 19, or a protein sequence exhibiting at least 70%, even 80, 85, 90, 95 or even 99% homology or homology. identity with the sequence SEQ ID NO: 19 and having a 4CL activity.
- this sequence comprises the sequence SEQ ID NO: 8, or a sequence having at least 60%, even 70, 80, 85, 90, 95 or even 99% identity with the sequence SEQ ID NO: 8 It may also comprise the sequence SEQ ID NO: 7, advantageously located upstream of the 4CL coding sequence, and / or the sequence SEQ ID NO: 9, advantageously located downstream of the 4CL coding sequence.
- said sequence encodes a BAS enzyme having the sequence SEQ ID NO: 20, or a protein sequence exhibiting at least 70%), or even 80, 85, 90, 95 or even 99% homology or identity with the sequence SEQ ID NO: 20 and having a BAS activity.
- this sequence comprises the sequence SEQ ID NO: 11, or a sequence having at least 60%, even 70, 80, 85, 90, 95 or even 99% identity with the sequence SEQ ID NO: 11 It may also comprise the sequence SEQ ID NO: 10 or SEQ ID NO: 13, advantageously located upstream of the BAS coding sequence, and / or the sequence SEQ ID NO: 12 or SEQ ID NO: 14, advantageously located downstream. of the BAS coding sequence.
- the fungal microorganism according to the invention comprises at least two heterologous sequences encoding the enzyme benzalacetone synthase (BAS), advantageously from the same source, still more advantageously of the same coding sequence but possibly placed under the control different regulatory sequences.
- BAS benzalacetone synthase
- the fungal microorganisms targeted by the present invention do not exhibit at least one of the following activities: TAL, 4CL, BAS and / or BAR.
- the fungal microorganism according to the invention comprises at least one heterologous or supernumerary sequence encoding the enzyme tyrosine ammonia lyase (TAL) or benzalacetone reductase (BAR), advantageously the TAL and BAR enzymes.
- said sequence encodes a TAL enzyme having the sequence SEQ ID NO: 18, or a protein sequence exhibiting at least 70%, even 80, 85, 90, 95 or even 99% homology or homology. identity with the sequence SEQ ID NO: 18 and having a TAL activity.
- this sequence comprises the sequence SEQ ID NO: 5, or a sequence having at least 60%, even 70, 80, 85, 90, 95 or even 99% identity with the sequence SEQ ID NO: 5 It may also comprise the sequence SEQ ID NO: 4, advantageously located upstream of the TAL coding sequence, and / or the sequence SEQ ID NO: 6, advantageously located downstream of the TAL coding sequence.
- said sequence encodes a BAR enzyme having the sequence SEQ ID NO: 21, or a protein sequence exhibiting at least 70%), or even 80, 85, 90, 95 or even 99% homology or identity with the sequence SEQ ID NO: 21 and having a BAR activity.
- this sequence comprises the sequence SEQ ID NO: 2, or a sequence having at least 60%, even 70, 80, 85, 90, 95 or even 99% identity with the sequence SEQ ID NO: 2
- It may also comprise the sequence SEQ ID NO: 1, advantageously located upstream of the BAR coding sequence, and / or the sequence SEQ ID NO: 3, advantageously located downstream of the BAR coding sequence.
- the fungal microorganisms targeted by the present invention comprise at least one heterologous sequence encoding the enzymes 4-coumarate: CoA ligase (4CL) and benzalacetone synthase (BAS), as well as at least one heterologous or supernumerary sequence encoding the enzyme tyrosine ammonia lyase (TAL) and benzalacetone reductase (BAR).
- 4-coumarate CoA ligase (4CL) and benzalacetone synthase (BAS)
- BAS benzalacetone synthase
- TAL tyrosine ammonia lyase
- BAR benzalacetone reductase
- a particular strain of Saccharomyces cerevisiae having these characteristics, and therefore a conversion route from tyrosine to functional rambinone adapted to the targeted applications, is the industrial strain R 4, deposited with the CNCM (National Collection of Cultures of Microorganisms, Institut Pasteur 25 rue du Dondel Roux, 75724 Paris Cedex 15) dated 1 June 2016 under the number 1-5101. This was obtained by chromosomal integration, at the HO locus of the strain deposited with the CNCM on September 4, 2008 under the number 1-4071, of expression cassettes encoding these 4 enzymes, as described below. below (Examples of realization).
- the fungal microorganisms according to the invention may undergo other genetic modifications, such as, for example: any means for introducing or increasing the capacity of the microorganism to synthesize rambinone from phenylalanine, for example via the introduction of a gene encoding a PAL enzyme.
- PAL enzymes are close to the TAL enzymes described above.
- it can be implemented a TAL enzyme also having a PAL activity.
- any means for introducing or increasing the ability of the microorganism to convert cinnamic acid to coumaric acid for example via the introduction of a gene encoding a C4H enzyme, optionally in combination with a gene encoding a CPR enzyme.
- any means of increasing the ability of the microorganism to produce malonyl-CoA for example as reported in Y. lipolytica (Qiao et al., 2015, Metab.Eng .: 29: 56-65) or by overproduction of the Acetyl-CoA carboxylase
- the microorganism used in the context of the invention comprises at least one heterologous or supernumerary sequence coding for the enzyme phenylalanine ammonia lyase (PAL) or cinnamate 4-hydroxylase (C4H), advantageously the PAL and C4H enzymes.
- PAL phenylalanine ammonia lyase
- C4H cinnamate 4-hydroxylase
- a fungal microorganism targeted by the invention is affected in its tyrosine degradation pathway as shown in FIG. 2.
- this pathway called the tyrosine tyrosine degradation pathway in the
- tyrosine is converted to p-hydroxyphenyl acetaldehyde, which may persist as it is or may be converted to either tyrosol or p-hydroxyphenyl acetate.
- a fungal microorganism of the invention has low ability or inability to degrade or convert tyrosine to tyrosol, p-hydroxyphenylacetaldehyde and / or p-hydroxyphenylacetate. It has been demonstrated, in the context of the present application, that the predominant degradation pathway of tyrosine in the fungal microorganisms of interest was the Tyrosine tyrosine degradation pathway, as illustrated in FIG.
- a microorganism may be of interest if under the conditions described in the experimental part, namely under aerobic fermentation conditions carried out in advantageously mineral medium, for example composed of 1.7 g / l of YNB (Difco TM), 5 g / L of ammonium sulfate, 2.7 g / L of potassium phosphate and 20 g / L of dextrose, and containing tyrosine, advantageously up to 300 mg / L, the amount of tyrosol produced is less than or equal to at 150 mg / l, advantageously less than or equal to 100 mg / l, or even 50, 40, 30, 20 mg / l or even 10 mg / l.
- advantageously mineral medium for example composed of 1.7 g / l of YNB (Difco TM), 5 g / L of ammonium sulfate, 2.7 g / L of potassium phosphate and 20 g / L of dextrose, and containing ty
- strains of fungal microorganisms of interest can be selected on the basis of their hydroxyphenyl pyruvate decarboxylase (HPPDC) activity, a method of measurement of which is detailed in the embodiment examples below.
- HPPDC hydroxyphenyl pyruvate decarboxylase
- the HPPDC activity in the microorganism according to the invention is less than or equal to 2 ⁇ 10 -6 kat per g of protein, advantageously less than or equal to 1 ⁇ 10 -6 kat per g of protein, or even to 5 ⁇ 10 "7 kat per g of protein. in the context of the invention, it refers to proteins extracted from the microorganism.
- the HPPDC activity measured in a microorganism according to the invention is preferably less than or equal to 10 -5 kat per g of protein, advantageously less than or equal to 5 ⁇ 10 -6 , 4 ⁇ 10 -6 , 3 ⁇ 10 "6 , 2 x 10 " 6 , 1 x 10 "6 kat per g of protein,
- the microorganism is selected for its low or no capacity to degrade tyrosine, evaluated for example according to one of the two methods mentioned above. As already stated, this selection of adapted microorganisms can be carried out before or after the genetic modification of said microorganism.
- the microorganism is selected for its natural ability to degrade tyrosol tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate weakly or not at all.
- a microorganism of interest in particular for its capacity to synthesize rambinone, is subjected to genetic modifications so as to reduce or even eliminate its ability to degrade tyrosine to tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate
- this can be achieved by inhibiting or inactivating one of the steps ensuring the transformation of tyrosine into tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate, in particular the deamination step. , decarboxylation, or even reduction.
- various means are available to those skilled in the art for effecting this inhibition or inactivation by genetic modification of the microorganism, in particular the chromosomal insertion of exogenous genetic elements or at the level of the regulatory regions so as to interfere with the expression of the target gene, either at the level of the coding sequence so as to prevent the production of the gene product or to cause the production of a truncated and / or inactive protein. It is also possible to mutate the target gene at the level of critical sequences for its expression or activity.
- the target gene is inactivated using a cassette capable of expressing a marker (Goldstein and McCusker, 1999, Yeast Chichester Engl 15, 1541-53, Guldener et al, 2002, Nucleic Acids Res 30, e23, Guldener et al., 1996, Nucleic Acids Res 24, 2519-24, Janke et al., 2004, Yeast 21, 947-62, Sauer, 1987, Mol Cell Biol. 2087-96), at the ends of which the 5 'and 3' regions of the target gene are inserted to allow homologous recombination and replace the coding portion of the gene with the marker expression cassette.
- a marker Goldstein and McCusker, 1999, Yeast Chichester Engl 15, 1541-53, Guldener et al, 2002, Nucleic Acids Res 30, e23, Guldener et al., 1996, Nucleic Acids Res 24, 2519-24, Janke et al., 2004, Yeast 21, 947-62,
- the fungal microorganism according to the invention is inactivated at the level of the activity involved in the decarboxylation of hydroxyphenyl pyruvate.
- at least 3 genes have been described as being involved in this activity, namely ARO10, PDC5 and PDC6 (Hazelwood et al., 2008; Appl. Environ. Microbiol. 74, 2259-66). Kneen et al., 2011, FEBS J. 278, 1842-53, Vuralhan et al., 2005, Appl., Environ Microbiol 71, 3276-84, Vuralhan et al., 2003, Appl., Environ Microbiol.
- At least one of the genes encoding phenylpyruvate decarboxylase ArolO, pyruvate decarboxylase Pdc5 and pyruvate decarboxylase Pdc6 is inactivated.
- the genes encoding phenylpyruvate decarboxylase ArolO, pyruvate decarboxylase Pdc5 and pyruvate decarboxylase Pdc6 are inactivated.
- the deaminase (s) involved in the first step of the tyrosine degradation pathway are inactivated.
- it may be Aro8 deaminase and / or Aro9 deaminase, or their counterparts in other fungal microorganisms.
- the alcohol (s) dehydrogenase (denoted DHA) involved in the third step of tyrosine tyrosine degradation pathway may be targeted.
- the present invention is directed to a fungal microorganism comprising at least one mutation or deletion in at least one of the genes encoding the following enzymes: Aro8 deaminase, Aro9 deaminase, ArolO decarboxylase, Pdc5 decarboxylase, Pdc6 decarboxylase, alcohol dehydrogenase ( ADH).
- said mutations and / or deletion result in a reduction or even a suppression of the ability of the microorganism to degrade tyrosine to tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate.
- said microorganism also has an ability to synthesize frambinone from tyrosine, possibly through the introduction of genetic modifications as described above.
- such a microorganism is a strain of Saccharomyces cerevisiae which has an ability to produce rambinone and inactivation of the ARO10 gene encoding a decarboxylase.
- This microorganism thus has a tyrosine to functional rambinone conversion pathway and a low capacity or inability to degrade tyrosine to tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate as described above.
- This is for example the industrial strain named R 8, filed with the CNCM on April 26, 2017, under the number 1-5200. This was obtained from the strain R 5, by insertion of a cassette allowing the inactivation of the ARO10 gene (see the embodiments below).
- the present invention relates to the use of a fungal microorganism having the ability to produce raspinone from tyrosine and a low capacity or inability to degrade tyrosine to tyrosol, p-hydroxyphenyl acetaldehyde and / or or p-hydroxyphenyl acetate, advantageously as described above and in particular the 1-5200 strain, for the production of rambinone, advantageously by aerobic fermentation.
- the invention also relates to a process for producing rambinone comprising culturing a fungal microorganism having the ability to produce raspinone from tyrosine and a low capacity or inability to degrade tyrosine to tyrosol , p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate, advantageously as described above and in particular the 1-5200 strain, in a medium comprising tyrosine.
- the tyrosine is added to the culture medium at a concentration of between 50 and 450 or 500 mg / l, for example of the order of 300 mg / l.
- the culture medium may also be supplemented with coumaric acid and / or phenylalanine.
- the microorganism used in the context of the invention naturally has a certain capacity to degrade tyrosine tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate, but this pathway of degradation is inhibited by the addition of a repressor of this pathway, for example an inhibitor of one of the enzymes involved in this pathway.
- the invention is directed to a process for producing rambinone comprising culturing a fungal microorganism having the capacity to produce rambinone from tyrosine in a medium comprising tyrosine and at least one repressor of the tyrosine degradation pathway to tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate.
- it is a genetically modified microorganism to confer or increase the ability of said microorganism to produce rambinone from tyrosine, as described above.
- the microorganism used is the industrial strain Saccharomyces cerevisiae RK4, deposited with the CNCM (National Collection of Cultures of Microorganisms, Pasteur Institute, 25 rue du Dondel Roux, 75724 Paris Cedex 15) dated 1 June 2016 under the number 1-5101.
- the microorganism used is the industrial strain Saccharomyces cerevisiae R 5, deposited with the CNCM (National Collection of Cultures of Microorganisms, Pasteur Institute, 25 rue du Dondel Roux, 75724 Paris Cedex 15) dated April 26, 2017 under the number 1-5199.
- CNCM National Collection of Cultures of Microorganisms, Pasteur Institute, 25 rue du Dondel Roux, 75724 Paris Cedex 15
- the tyrosine degradation repressor tyrosol, p-hydroxyphenyl acetaldehyde and / or p-hydroxyphenyl acetate is chosen from glutamate, glutamine or one of their derivatives, advantageously glutamate .
- this repressor, in particular glutamate is added to the culture medium at a concentration greater than or equal to 0.5 g / L, or even 1, 2 or 3 g / L, for example order of 2 g / L.
- the fungal microorganism is cultured under conditions favoring the production of rambinone.
- Particularly suitable conditions of culture are the following:
- a mineral medium for example composed of 1.7 g / l of YNB (Difco TM), 5 g / l of ammonium sulphate, 2.7 g / l of potassium phosphate and 20 g / L dextrose; - for a duration ranging from several hours to several days;
- the culture medium having a frambinone concentration advantageously greater than 4 mg / l, more advantageously greater than or equal to 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or even 20, 25 or 30 mg / L.
- the rambinone thus produced can be isolated from the culture medium.
- TAL tyrosine ammonia lyase
- 4Cl 4-coumarate-CoA ligase
- BAS benzalacetone synthase
- BAR benzalacetone reductase
- PAL phenylalanine ammonia lyase
- C4H cinnamate 4 hydroxylase
- Figure 3 Diagram of the modified HO locus in the genome of strains S. cerevisiae RK4, RK5 and RK8 and the cassette allowing to modify the locus ARO10
- Five gene expression cassettes and a marker cassette were integrated at the HO locus using different overlapping recombination regions (RR1-5) between the cassettes for in vivo assembly.
- RR1-5 overlapping recombination regions
- the marker cassette pTEF-KanMX-tTEF is absent.
- Figure 4 Production of rambinone by S. cerevisiae strain RK4 after 7 days The concentration of frambinone (in mg / L) was determined after 7 days of culture depending on the substrate (tyrosine synthesized by the cell from glucose and glucose). ammonium sulphate (so-called de novo production), tyrosine or coumaric acid added to the culture medium).
- Figure 5 Tyrosol production by S. cerevisiae strain RK4 after 7 days
- the concentration of tyrosol was determined after 7 days of culture depending on the substrate (tyrosine synthesized by the cell from glucose and ammonium sulphate (called de novo), tyrosine or coumaric acid added in the culture medium).
- FIG. 6 HDPPC activity in cell extracts (strain S. cerevisiae RK4, RK5 and RK8) after 16 hours of fermentation in a synthetic medium containing tyrosine with or without glutamate
- HDPPC hydroxy-phenylpyruvate activity
- the present invention will be further illustrated in connection with a genetically engineered strain of Saccharomyces cerevisiae for expressing 4 heterologous genes encoding the integrated TAL, 4CL, BAS and BAR enzymes at its HO locus and effectively producing rambinone from tyrosine. in a medium supplemented with glutamate, or with a derived strain having an inactivated ARO10 gene.
- a genetically engineered strain of Saccharomyces cerevisiae for expressing 4 heterologous genes encoding the integrated TAL, 4CL, BAS and BAR enzymes at its HO locus and effectively producing rambinone from tyrosine.
- a medium supplemented with glutamate or with a derived strain having an inactivated ARO10 gene.
- these examples are in no way limiting.
- Enzyme Source Reference Sequence (codon-optimized for expression in S. cerevisiae)
- the coding sequences were "codon-optimized" for expression in S. cerevisiae.
- the corresponding sequences are shown in Table 4 above.
- Rg Rhodotorula glutinis
- Ai Arabidopsis thaliana
- strain Rp Rheum palmatum From strain RK4 described above, strain R 5 was obtained by removing the kanMX marker cassette. This was achieved by expression of Cre recombinase which drives the excision of the kanMX marker which is flanked by loxP sites (Steensma and Linde, 2001, Yeast, 18 (5): 469-72). This is the strain filed with the CNCM on April 26, 2017, under number 1-5199.
- An inactivation cassette of the ARO10 gene was then constructed (FIG. 3B). It is composed of a hygromycin marker cassette, pTEFlshort-hph-tTEF1 (pTEF1 short: SEQ ID NO: 22, hph: SEQ ID NO: 23, tTEF1: SEQ ID NO: 24), flanked by sequences homologous to promoter (pARO10: SEQ ID NO: 25) and terminator (tARO10, SEQ ID NO: 26) of ARO10, upstream and downstream, respectively.
- a guide RNA sequence specific for the ARO10 gene was cloned into a plasmid making it possible to express Cas9p and said RNA in S. cerevisiae.
- the strain R 5 described above was cotransformed with this plasmid and the inactivation cassette of the ARO10 gene. Positive clones (resistant to hygromycin) were selected and verified for inactivation of all ARO10 alleles.
- the strain RK8 thus obtained was filed with the CNCM on April 26, 2017, under the number 1-5200.
- HPLC devices and parameters are summarized in Table 6 below and allow the separation of rambinone and tyrosol from other compounds.
- a calibration was performed using standard solutions between 0.1 and 300 mg / L. The samples of the yeast cultures were centrifuged (> 15,000 ⁇ g, 10 min) and the supernatant was filtered through a 0.45 ⁇ filter before injection into the HPLC.
- Table 6 HPLC Devices and Parameters
- HPPDC activity Enzyme detection of hydroxyphenyl pyruvate decarboxylase (HPPDC) activity
- HPPDC activity an enzymatic test coupled with a crude cell extract was developed.
- the cell extract was prepared from a culture on the night (16h) of the strain of interest in a synthetic medium composed of 1.7 g / L of YNB (Difco TM), 5 g / L of sodium sulfate. ammonium, 2.7 g / L potassium phosphate and 20 g / L dextrose.
- the medium was further supplemented with 300 mg / L of L-tyrosine and optionally different sources of nitrogen (eg L-glutamate). After aerobic growth at 30 ° C, the cells were harvested by centrifugation (5000xg, 4 min, 4 ° C) and washed twice in wash buffer (10 mM potassium phosphate, 2 mM EDTA, pH 6.8).
- wash buffer 10 mM potassium phosphate, 2 mM EDTA, pH 6.8
- the cell pellet was taken up in extraction buffer (100 mM potassium phosphate, 2 mM magnesium chloride, 1 mM DTT, 1x Coplete TM proteinase inhibitors, pH 6.8) and the cells were broken with a "FastPrep disruptor” disruptor (with 0.45 mm diameter glass beads, four cycles of 30 seconds at 6 m / s and 1 min on ice). Cell debris was removed by centrifugation and the supernatant was used as a crude cell extract. The protein concentration was determined using the "Uptima BC Assay Protein Quantification Kit” according to the manufacturer's instructions. The enzymatic assay was performed as described by Kneen et al. (2011, FEBS J. 278, 1842-53), with minor modifications.
- the test couples the HPPDC reaction (decarboxylation of hydroxyphenyl pyruvate (HPP) to hydroxyphenyl acetaldehyde) with a second reaction (oxidation of hydroxyphenyl acetaldehyde to hydroxyphenyl ethanol / Tyrosol) catalyzed by the auxiliary enzyme alcohol dehydrogenase (ADH).
- ADH activity leads to a reduction of NADH to NAD + which can be monitored by decreasing absorption at 340 nm in a spectrophotometer.
- the reaction mixture (1 ml) contained 100 mM potassium phosphate, 1 mM magnesium chloride, 0.5 mM thiamine pyrophosphate, 0.1 mM NADH, 0.5 U horse liver ADH, 4 mM HPP and 0.1 crude cell extract equivalent to approximately 200 ⁇ g of total protein.
- the reactions were measured at 32 ° C and pH 6.8. The reaction was initiated by adding the HPP substrate.
- the fermentation tests were carried out with strain R 4 grown in a mineral medium, composed of 1.7 g / L of YNB (Difco TM), 5 g / L of ammonium sulfate, 2.7 g / L of potassium phosphate and 20 g / L of dextrose.
- the medium may contain 300 mg / L of tyrosine or 100 mg / L of coumaric acid.
- fermentation tests were conducted under aerobic conditions to optimize frambinone production.
- strain R 4 can synthesize about 6 mg / L of rambinone from tyrosine.
- concentration of rambinone in media is approximately 14 mg / L.
- Tyrosine degradation to tyrosol is a well-known degradation pathway ( Figure 2) (Hazelwood et al., 2008, Appl., Environ Microbiol 74, 2259-66).
- the first step is a transamination of tyrosine leading to the formation of hydroxyphenyl pyruvate.
- This compound is then decarboxylated to hydroxyphenyl acetaldehyde (EC: 4.1.1.80).
- the aldehyde function is reduced to form a hydroxylated molecule called tyrosol (EC: 1.1.1.90).
- HPPDC P-hydroxyphenyl pyruvate decarboxylase
- FIG. 6 shows the activity in the cell extract of R 4 after culturing in the fermentation medium containing tyrosine with or without 2 g / L of glutamate. The results confirm the decrease in HPPDC activity in fermenting cells in the presence of glutamate.
- Figure 6 also reveals that, as expected, strains R 4 and R 5 (from which strain R 8 is derived) have the same level of HPPDC activity in the presence of tyrosine. 4 / Impact of the inhibition of tyrosine degradation on the production of rambinone and tyrosol
- HPLC long method
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- Molecular Biology (AREA)
- Medicinal Chemistry (AREA)
- Mycology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Botany (AREA)
- Tropical Medicine & Parasitology (AREA)
- Virology (AREA)
- Physics & Mathematics (AREA)
- Biophysics (AREA)
- Plant Pathology (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1655089A FR3052170B1 (fr) | 2016-06-03 | 2016-06-03 | Production de frambinone par un microorganisme fongique recombinant |
PCT/FR2017/051407 WO2017207950A1 (fr) | 2016-06-03 | 2017-06-02 | Production de frambinone par un microorganisme fongique recombinant |
Publications (1)
Publication Number | Publication Date |
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EP3464556A1 true EP3464556A1 (fr) | 2019-04-10 |
Family
ID=57045072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17732985.1A Pending EP3464556A1 (fr) | 2016-06-03 | 2017-06-02 | Production de frambinone par un microorganisme fongique recombinant |
Country Status (4)
Country | Link |
---|---|
US (2) | US10793880B2 (fr) |
EP (1) | EP3464556A1 (fr) |
FR (1) | FR3052170B1 (fr) |
WO (1) | WO2017207950A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3714056A1 (fr) | 2017-11-20 | 2020-09-30 | Axxence Holding B.V. | Production d'un composé aromatique dans une cellule hôte |
CN108753852B (zh) * | 2018-06-22 | 2021-10-26 | 江南大学 | 一种生物法制备覆盆子酮的方法 |
CN111748534B (zh) * | 2020-08-10 | 2022-05-10 | 天津中医药大学 | 一种SmC4H蛋白及其构建与表达方法 |
FR3122882A1 (fr) * | 2021-05-12 | 2022-11-18 | Bgene Genetics | Biosynthèse de composés phénylpropanoïdes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6521748B2 (en) | 1999-08-06 | 2003-02-18 | E. I. Du Pont De Nemours And Company | Polynucleotide encoding a mutant Rhodotorula glutinis tyrosine ammonia lyase polypeptide |
GB2416770A (en) | 2004-07-28 | 2006-02-08 | Danisco | Synthesis of benzalacetone/raspberry ketone by chalcone synthase |
GB2416769A (en) * | 2004-07-28 | 2006-02-08 | Danisco | Biosynthesis of raspberry ketone |
EP2957629A1 (fr) * | 2014-06-18 | 2015-12-23 | Rhodia Opérations | Production améliorée de vanilloïdes par fermentation |
-
2016
- 2016-06-03 FR FR1655089A patent/FR3052170B1/fr active Active
-
2017
- 2017-06-02 US US16/302,527 patent/US10793880B2/en active Active
- 2017-06-02 EP EP17732985.1A patent/EP3464556A1/fr active Pending
- 2017-06-02 WO PCT/FR2017/051407 patent/WO2017207950A1/fr unknown
-
2020
- 2020-08-27 US US17/004,863 patent/US11345936B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US11345936B2 (en) | 2022-05-31 |
US20190309330A1 (en) | 2019-10-10 |
FR3052170A1 (fr) | 2017-12-08 |
WO2017207950A1 (fr) | 2017-12-07 |
US20200392545A1 (en) | 2020-12-17 |
FR3052170B1 (fr) | 2021-01-22 |
US10793880B2 (en) | 2020-10-06 |
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