EP2986721A1 - Polypeptides codant pour des mannanases mutees ayant une efficacite catalytique amelioree - Google Patents
Polypeptides codant pour des mannanases mutees ayant une efficacite catalytique amelioreeInfo
- Publication number
- EP2986721A1 EP2986721A1 EP14709545.9A EP14709545A EP2986721A1 EP 2986721 A1 EP2986721 A1 EP 2986721A1 EP 14709545 A EP14709545 A EP 14709545A EP 2986721 A1 EP2986721 A1 EP 2986721A1
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- European Patent Office
- Prior art keywords
- polypeptide
- polynucleotide
- vector
- host cell
- mannanase
- Prior art date
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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
- C12N9/14—Hydrolases (3)
- C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
- C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
- C12N9/2477—Hemicellulases not provided in a preceding group
- C12N9/2488—Mannanases
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y302/00—Hydrolases acting on glycosyl compounds, i.e. glycosylases (3.2)
- C12Y302/01—Glycosidases, i.e. enzymes hydrolysing O- and S-glycosyl compounds (3.2.1)
- C12Y302/01025—Beta-mannosidase (3.2.1.25), i.e. mannanase
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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
- C12N9/14—Hydrolases (3)
- C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
- C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
- C12N9/2477—Hemicellulases not provided in a preceding group
- C12N9/2488—Mannanases
- C12N9/2494—Mannan endo-1,4-beta-mannosidase (3.2.1.78), i.e. endo-beta-mannanase
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/02—Monosaccharides
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/14—Preparation of compounds containing saccharide radicals produced by the action of a carbohydrase (EC 3.2.x), e.g. by alpha-amylase, e.g. by cellulase, hemicellulase
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y302/00—Hydrolases acting on glycosyl compounds, i.e. glycosylases (3.2)
- C12Y302/01—Glycosidases, i.e. enzymes hydrolysing O- and S-glycosyl compounds (3.2.1)
- C12Y302/01078—Mannan endo-1,4-beta-mannosidase (3.2.1.78), i.e. endo-beta-mannanase
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y302/00—Hydrolases acting on glycosyl compounds, i.e. glycosylases (3.2)
- C12Y302/01—Glycosidases, i.e. enzymes hydrolysing O- and S-glycosyl compounds (3.2.1)
Definitions
- the invention provides polypeptides encoding mannanase mutants having improved enzyme efficiency.
- the invention also provides polynucleotides encoding such polypeptides, vectors and host cells comprising such polynucleotides, as well as compositions comprising such polypeptide (s), polynucleotide (s), vector (s) or host cell (s) (s).
- the invention finally covers the various uses of such polypeptides, polynucleotides, vectors, host cells or compositions.
- Saccharification ie the enzymatic hydrolysis of the components of lignocellulosic biomass, is today one of the main bottlenecks in the biological refinery process: the resistance of plant cell walls leads to the need for a large amount of enzymes to hydrolyze lignocellulosic biomass into fermentable sugars. The conversion of lignocellulosic biomass thus represents today a high cost reaction.
- the Ascomycete fungus Trichoderma reesei is today one of the most used industrial fungi worldwide. It is indeed capable of producing an enzyme cocktail rich in cellulases, used for the degradation of lignocellulosic biomass. However, the considerable costs incurred by the use of such enzymatic cocktails for the degradation of lignocellulosic biomass constitute a barrier to the use of this renewable resource.
- Lignocellulose is the most abundant component of biomass, comprising about fifty percent of plant material produced by photosynthesis and representing the most important renewable biological resource in the soil. It mainly contains three types of polymers: cellulose, hemicellulose and lignin. Cellulose accounts for about 45% of the dry mass of lignocellulose. It is a linear polymer composed of D-glucoses linked by long chain-linked 1,4-glycosidic bonds linked together by non-covalent bonds.
- the hemicellulose is formed of heteropolymers representing 15 to 35% of the biomass, and containing pentoses, such as ⁇ -D-xylose or Fa-L-arabinose, hexoses, such as ⁇ -D-mannose, ⁇ -D-glucose or ⁇ -D-galactose, or uronic acids.
- pentoses such as ⁇ -D-xylose or Fa-L-arabinose
- hexoses such as ⁇ -D-mannose, ⁇ -D-glucose or ⁇ -D-galactose, or uronic acids.
- Lignin is composed of phenylpropane units linked together by different types of bonds. It binds to cellulose and hemicellulose and forms a physical barrier protecting plants, more specifically plant cells.
- Hemicellulose refers to a diverse set of non-crystalline carbohydrate polymers, of which mannan are a major component, especially in softwood.
- Mannans are a family of complex sugars comprising a structure of residues of D-mannose, called mannan, or a combination of residues of ⁇ 1,4- ⁇ - ⁇ 3 ⁇ 8 ⁇ and pi, 4-D-glucose, called glucomannan.
- Each of the two structures can be complemented with side chains of galactose, and then form a polymer of dinosaurs called galactomannan and galactoglucomannan, respectively.
- Mannan in the broad sense of the term, are hydrolysed by a coordinated action of different types of glycoside hydrolases including mannanases. Mannanases are therefore necessary enzymes for the conversion of lignocellulosic biomass.
- Two mannanases from the coprophilous fungus Podospora anserina have recently been studied and identified as factors that enhance the efficacy of the Trichoderma reesei enzyme cocktail for the degradation of lignocellulosic biomass (Couturier et al, Applied and Environmental Microbiology, January 2011, 77 (1)). 23: 237-246).
- the inventors have sought to further increase the effectiveness of an enzymatic cocktail of Trichoderma reesei supplemented. They thus sought to develop Man5A and Man26A mannanase variants having improved enzymatic activities compared to native enzymes.
- the invention thus relates to a mutated mannanase polypeptide having a sequence derived from a native mannanase of the coprophilous ascomycete filamentous fungal fungus Podospora anserina, and characterized by a catalytic efficiency increased by at least 25% relative to the efficacy. catalytic system of this native mannanase.
- said polypeptide is derived from the mannanase Man5A or Man26A from Podospora anserina and is defined by one of the sequences SEQ ID NO: 3 to 14, and differs from at least one amino acid of the sequence SEQ ID NO: 1 or 11.
- the invention also relates to a polynucleotide encoding such a peptide, a vector comprising such a polynucleotide and a host cell comprising such a polynucleotide or such a vector.
- the invention further relates to a composition comprising a polypeptide, a polynucleotide, a vector or a host cell of the invention.
- the invention finally relates to the use of a polypeptide, a polynucleotide, a vector, a host cell or a composition of the invention for the degradation of compounds comprising mannan, more particularly, for the degradation of lignocellulosic biomass.
- mutant mannanases from the coprophilous ascomycete filamentous fungal fungus Podospora anserina, said mutants showing an improved catalytic efficiency of at least 25% relative to to native enzymes.
- the subject of the present invention is therefore a polypeptide consisting of a mutated mannanase, having a sequence derived from a native mannanase of the coprophilous ascomycete filamentous fungal fungus Podospora anserina, and being characterized by a catalytic efficiency increased by at least 25% with respect to catalytic efficiency of this native mannanase.
- mannanase refers to a family of enzymes capable of hydrolyzing polyose chains composed of mannoses (called mannans, mannopolymers or polymannoses).
- mutant mannanase is meant a mannanase defined by a sequence derived from a native mannanase and whose sequence comprises at least one mutation relative to the sequence of this native mannanase.
- mutation refers to the substitution, replacement, insertion or deletion of one or more amino acids in a reference protein sequence.
- a mutated mannanase of the invention is characterized by a catalytic efficiency increased by at least 25% over the catalytic efficiency of the native mannanase.
- the catalytic efficiency of an enzymatic reaction which is associated with a given enzyme, is well known to those skilled in the art and is commonly defined by measuring the ratio k CAT / KM, where k cat is the catalytic constant, corresponding to the number of moles of product formed per second per mole of enzyme, and where K is the Michaelis constant, characteristic of the enzyme tested.
- the catalytic efficiency of the polypeptides of the invention is measured on the hydrolysis reaction of galactomannan and compared with that of native mannanase.
- Hydrolysis reactions of mannooligosaccharides such as mannopentaose and mannohexaose can also be used. Such reactions and measurements are described in Berrin et al., 2007 (Appl Microbiol Biotechnol., 74 (5): 1001).
- the polypeptide is derived from the mannanase Man5 A of Podospora anserina.
- Man5A mannanase Man5A from Podospora anserina, defined by the protein sequence SEQ ID NO: 1. This mannanase is encoded by the nucleic sequence SEQ ID NO: 2.
- polypeptide of the invention is defined by the sequence SEQ ID NO: 1
- the residue in position 256 is a valine, a leucine or an alanine
- sequence SEQ ID NO: 3 differs from at least one amino acid of the sequence SEQ ID NO: 1.
- polypeptide of the invention is defined by the sequence SEQ ID NO: 4. *
- the polypeptide of the invention is defined by the sequence SEQ ID NO: 5.
- SEQ ID NO: 5 LPQAQGGGAA ASAKVSGTRF VIDGKTGYFA GTNSYWIGFL T NRDVDTTL DHIASSGLKI LRVWGFNDVN NQPSGNTVWF QRLASSGSQI NTGPNGLQRL DYLVRSAETR GIKLIIALVN YWDDFGGMKA YV AFGGTX 139 E SWYTNARAQE QYKRYIQAVV SRYVNSPAIF AWELANEPRC KGCNTNVIFN WATQISDYIR SLDKDFILITL GDEGFGLPGQ TTX 223 PYQYGEG TDFVKNLQI NLDFGTFHMY PGHWGVPTSF GPGWIKDHAA ACRAAGKPCL LEEYGYESDR CNVQKGWQQA SRELSRDGMS GDLFWQWGDQ LSTGQTHNDG FTIYYGSSLA T
- sequence SEQ ID NO: 5 differs from at least one amino acid of the sequence SEQ ID NO: 1.
- polypeptide of the invention is defined by the sequence SEQ ID NO: 6.
- the catalytic efficiency of the polypeptide defined by the sequence SEQ ID NO: 6 (mutant K139R / Y223H) is increased by a factor of 1.7 (70% increase) relative to that of the native Man5A mannanase (SEQ ID NO: 1) on the hydrolysis reaction of galactomannan.
- the polypeptide of the invention is defined by the sequence SEQ ID NO: 7.
- SEQ ID NO: 7 LPQAQGGGAA ASAKVSGTRF VEDGKTGYFA GTNSYWIGFL TNN DVDTTL DHIASSGLKI LRVWGFNDVN NQPSGNTVWF QRLASSGSQI NTGPNGLQRL DYLVRSAETR GD LIIALVN YWDDFGGMKA YVNAFGGTKE SWYTNARAQE QYKRYIQAW SRYVNSPAEF AWELANEPRC KGCNTNVIFN WATQISDYIR SLDKDHLITL GDEGFGLPGQ TTYPYQYGEG TDFVKNLQIK NLDFGTFHMY PGHWGX STPs 256 GPGWIKDHAA ACRAAX 276 KPCL LEEYGYESDR CNVQKGWQQA SRELSRDGMS GDLFWX 316 WGDQ LSTGQTHNDG FTIYYGSSLA TCL
- the residue in position 256 is a valine, a leucine or an alanine
- sequence SEQ ID NO: 7 differs from at least one amino acid of the sequence SEQ ID NO: 1.
- polypeptide of the invention is defined by the sequence SEQ ID NO: 8.
- the catalytic efficiency of the polypeptide defined by the sequence SEQ ID NO: 8 (mutant V256L / G276V / Q316H) is increased by a factor of 1.3 (30% increase) relative to that of native mannanase Man5A (SEQ ID NO: 1) on the hydrolysis reaction of galactomannan.
- the polypeptide of the invention is defined by the sequence SEQ ID NO: 9.
- sequence SEQ ID NO: 9 differs from at least one amino acid in the sequence
- polypeptide of the invention is defined by the sequence
- the catalytic efficiency of the polypeptide defined by the sequence SEQ ID NO: 10 (mutant W36R / I195T V256A) is increased by a 1.78 (78% increase) compared to that of native Man5A mannanase (SEQ ID NO: 1) on the hydrolysis reaction of galactomannan.
- the mutated mannanase of the invention is derived from the mannanase Man26A of Podospora anserina.
- Man26A is meant the mannanase Man26A of Podospora anserina, defined by the protein sequence SEQ ID NO: 11 and the nucleic sequence SEQ ID NO: 12.
- the mutated mannanase of the invention derived from Man26A is defined by the sequence SEQ ID NO: 13.
- sequence SEQ ID NO: 13 differs, from at least one amino acid, from the sequence SEQ ID NO: 11.
- the mutated mannanase of the invention is defined by the sequence SEQ ID NO: 14.
- the inventors have shown that the catalytic efficiency of a polypeptide defined by the sequence SEQ ID NO: 14 (P140L / D416G mutant) is increased by a factor of 1.3 (30% increase) relative to that of the native Man5A mannanase. (SEQ ID NO: 11) on the hydrolysis reaction of galactomannan.
- Another subject of the invention relates to a polynucleotide encoding a polypeptide of the invention.
- said polynucleotide is a DNA or RNA molecule.
- said polynucleotide encodes a mutated mannanase of the invention defined by a sequence selected from SEQ ID NO: 3-10 and 13-14 sequences.
- said polynucleotide is defined by a sequence chosen from the sequences SEQ ID NO: 15-19.
- a polynucleotide of the invention is preferably an isolated and / or purified sequence.
- the subject of the invention is also a vector comprising a polynucleotide of the invention.
- vector refers to a nucleic acid molecule in which it is possible to insert foreign nucleic acid fragments, and then introduce them. maintain or even express them in a host cell.
- a polynucleotide of the invention may be introduced into any vector suitable for its expression, such as a plasmid, a cosmid, an episome, an artificial chromosome, a phage or a viral vector.
- vectors that can be used in the context of the present invention are vast. They may be cloning and / or expression vectors. In general, they are known to those skilled in the art and many of them are available commercially but it is also possible to build or modify them by the techniques of genetic manipulation. Plasmids such as JMP61, pPICZaA, pPICZaB, pPICZaC, etc. can be mentioned as examples.
- a vector implemented in the context of the present invention contains an origin of replication ensuring the initiation of replication in a producer cell and / or a host cell. It also includes the elements necessary for the expression of a polynucleotide of the invention, such as a promoter and a terminator. Examples of promoters that can be used according to the invention include, but are not limited to, the POX2, AOX (oxidated alcohol) promoters.
- It may further comprise one or more selection gene (s) making it possible to select or identify the cells transfected by said vector (complementation of an auxotrophic mutation, gene encoding resistance to an antibiotic, etc.). It may also comprise additional elements improving its maintenance and / or its stability in a given cell (cer sequence which promotes the monomeric maintenance of a plasmid, integration sequences in the cellular genome).
- the vector of the invention may optionally be combined with one or more substances that improve the transfection efficiency and / or the stability of the vector.
- substances are widely documented in the literature accessible to those skilled in the art.
- they may be polymers, especially cationic lipids, liposomes, nuclear proteins or neutral lipids. These substances can be used alone or in combination.
- a plasmid recombinant vector associated with cationic lipids DOGS, DC-CHOL, spermine-chol, spermidine-chol, etc.
- DOPE neutral lipids
- the present invention also relates to a host cell comprising a vector or polynucleotide of the invention.
- such a cell is constituted by any cell transferable by a polynucleotide or a vector of the invention as described above.
- Bacterial expression systems can be used in the context of the present invention.
- bacterial host cells include in particular bacteria of the Escherichia genera (for example Escherichia coli), Pseudomonas (e.g., Pseudomonas fluorescens or Pseudomonas stutzerei), Proteus (e.g. Proteus mirabilis), Ralstonia (e.g. Ralstonia eutrophd), Streptomyces, Staphylococcus (e.g. Streptomyces carnosus), Lactococcus (e.g. Lactoccocus lactis), or Bacillus (e.g. Bacillus subtilis, Bacillus megaterium or Bacillus licheniformis), etc.
- Escherichia genera for example Escherichia coli
- Pseudomonas e.g., Pseudomonas fluorescens or Pseu
- yeast cells are also host cells that may be suitable in the context of the invention.
- yeast host cells which may be used include, but are not limited to, Saccharomyces cerevisiae, Schizosaccharomyces pombe, Klyveromyces lactis, Yarrowia lipolytica, Hansenula polymorpha or Pichia pastoris.
- the fungal expression systems are also conceivable within the framework of the present invention, such as Aspergillus niger, Chrysosporium lucknowense, Aspergillus (for example Aspergillus oryzae, Aspergillus niger, Aspergillus nidulans, etc.), Podospora anserina or Trichoderma reesei.
- mammalian expression systems can still be used in the context of the invention, for example NSO, CHO, BHK cell lines, transgenic systems of mammalian origin, but also cells insects or viral expression systems such as bacteriophage M13, T7 or ⁇ or Baculovirus expression systems.
- the host cell of the invention is chosen from Yarrowia lipolytica and Pichia pastoris.
- the polynucleotide included in the vector and / or the host cell of the invention may optionally be associated with a sequence coding for a signal peptide (also called signal sequence), allowing the secretion of the mutated mannanases of the invention in the extracellular space and thus simplified detection and purification thereof in the culture supernatant of the host cells.
- a signal peptide also called signal sequence
- Another subject of the invention relates to a process for producing a polypeptide of the invention, said method comprising the steps of:
- step (ii) inserting said nucleic acid fragment obtained in step (i) into an expression vector comprising a promoter, so as to allow the expression of said nucleic acid fragment under the control of said promoter,
- step (iii) introducing the expression vector obtained in step (ii) into a host cell
- step (iv) culturing the host cell obtained in step (iii),
- nucleic acid fragment comprising a polynucleotide of the invention.
- the nucleic acid fragment of step (i) comprises a polynucleotide associated with a signal sequence.
- the signal sequence is fused to the polynucleotide of the invention upstream thereof.
- signal sequences include, but are not limited to, the preprolip2 secretion peptide sequence (Bordes et al., 2007, J. Microbiol Meth., 70, 493), the pre-pro-factor secretion sequence has S. cerevisiae (Kjeldsen, 2000, Appl Microbiol Biotechnol 54 (3): 277-86) or the signal sequence of native proteins.
- the methods of amplification of a nucleic acid fragment are well known to those skilled in the art, and include in particular the polymerase chain reaction or PCR (Polymerase Chain Reaction).
- primer pairs usable for the amplification of a polypeptide of the invention derived from mannanase Man5A is provided by the sequences SEQ ID NO: 20-21; an example of primer pairs usable for the amplification of a polypeptide of the invention derived from mannanase Man26A is provided by the sequences SEQ ID NO: 22-23. 2
- Said sequence is inserted into the vector so as to be operably linked to the promoter present in the vector, allowing the expression of said nucleic sequence under the control of said promoter.
- operably linked means that the promoter is positioned relative to the inserted nucleic acid fragment so that transcription can begin. This means that the promoter is positioned upstream of said nucleic acid fragment, at a distance allowing the expression of the latter.
- the expression vector comprises a selection gene.
- selection genes include, but are not limited to, the zeocin resistance gene and the histidine auxotrophy gene.
- the expression vector used in step (ii) is JMP61, pPICZaA, or pPICZaC.
- the step (iii) of introducing the vector into the host cell is carried out by transformation techniques well known to those skilled in the art, such as electrolocation, transfection, lipofection, chemical transfection, transformation by ionization. Lithium acetate, biolistic transformation, PEG transformation, protoplast fusion, liposome transformation, Agrobacterium tumefaciens transformation, viral or adenoviral transformation or transduction.
- the host cell of step (iii) is Pichia pastoris or Yarrowia lipolytica.
- the vector of step (ii) is preferably pPICZaA, or pPICZaC.
- the vector of step (ii) is preferably JMP61.
- the production method of the invention may comprise an additional step (iv ') of selecting cells having integrated the expression vector in step (iii), to increase the production yield of a polypeptide of the invention. This type of selection is performed by techniques well known to those skilled in the art.
- the recovery of the polypeptide of the invention is made from the culture medium of step (iv) and carried out by techniques well known to those skilled in the art.
- the recovery can be done directly in the secretome of the host cells present in the culture medium obtained in step (iv).
- step (i) does not comprise a signal sequence, it will be necessary to lyse the cells and recover the polypeptide of the invention for example in the supernatant of the culture medium after centrifugation of the -this.
- the invention relates to a composition comprising at least one polypeptide, a polynucleotide, a vector or a host cell of the invention.
- said composition may comprise one or more polypeptide (s) of the invention (or a polynucleotide, a vector or a host cell of the invention).
- Said composition may also optionally comprise one or more native mannanase (s) (or at least one or more polynucleotide (s), vector (s) or associated host cell (s) (s) )) of Podospora anserina, such as, for example, native mannanases Man5A and Man26A.
- native mannanase or at least one or more polynucleotide (s), vector (s) or associated host cell (s) (s)
- Podospora anserina such as, for example, native mannanases Man5A and Man26A.
- composition may also optionally comprise one or more mannanase (s) (or at least one or more polynucleotide (s), vector (s) or associated host cell (s)), which are native or mutated, of any species.
- mannanase or at least one or more polynucleotide (s), vector (s) or associated host cell (s)
- said composition optionally comprises one or more other hydrolase (s) (or polynucleotides, vectors or an associated host cell), the one or more other hydrolase (s) being review (s) degradation of the lignocellulosic biomass, such as endoglucanases, exoglucanases, polysaccharides monoxygenases, ⁇ -glucosidases, cellobiose dehydrogenases, xylanases, arabinofuranosidases, galactosidases, arabinanases, carbohydrates esterases, glucuronidases, methyl glucuronoyl esterases, acetyl esterases, pectinases.
- hydrolase or polynucleotides, vectors or an associated host cell
- said composition comprises an enzymatic cocktail of Trichoderma reesei cellulases.
- the enzyme cocktail of Trichoderma reesei cellulases corresponds to the secretome of said fungus Trichoderma reesei.
- secretome refers to all the proteins released by a cell, tissue or organism.
- Methods for recovering the secretome of a cell including methods for obtaining a cocktail of Trichoderma reesei cellulases are well known to those skilled in the art.
- Such cellulosic cocktails of Trichoderma reesei are also commercially available, such as the following enzymatic cocktails: GC220 (GENENCOR), MULTIFECT GC (GENENCOR), Accellerase (Danisco), Cellic C-Tec (NOVOZYME), or CELLUCLAST 1.5L (NOVOZYME).
- said composition further comprises an enzymatic cocktail of Trichoderma reesei cellulases, and an enzymatic cocktail of Pycnoporus cinnabarinus, comprising a cellobiose dehydrogenase (CDH) or a cellobiose dehydrogenase of Pycnoporus cinnabarinus (or a polynucleotide, vector or associated host cell).
- CDH cellobiose dehydrogenase
- a cellobiose dehydrogenase of Pycnoporus cinnabarinus or a polynucleotide, vector or associated host cell.
- said composition comprises an enzyme cocktail of Trichoderma reesei cellulases and at least one polypeptide of the invention, at a concentration of at most 10 mg of polypeptide per gram of material to be hydrolysed, preferentially 10 ⁇ g of polypeptide per gram of material to be hydrolysed.
- Mannanases are enzymes that are used today in a wide variety of industrial fields such as the paper and cellulose industry, the food and agriculture industry, coffee extraction, oil drilling and the detergent industry. .
- an object of the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for the degradation of compounds comprising mannan.
- a mannan is a polysaccharide composed of mannose monomers.
- the term "mannan” is used here in the broad sense, and includes complex and derived sugars comprising mannose polymers. In particular, the term encompasses simple mannans (polymers consisting solely of mannose), galactomannans, glucomannans and galactoglucomannans.
- Mannans are present in many plant compounds, such as fruits and some algae. They are also abundant in certain seeds and nuts ("ivory nut", locust bean gum, tara gum, guar gum, fenurec gum). They constitute an important component of biomass, particularly lignocellulosic biomass such as softwoods (gymnosperms), softwoods (pine, spruce) and in significant quantities in hardwoods.
- biomass refers to all organic matter of plant origin (including algae), animal or fungal that can become a source of energy, for example by combustion, after methanisation (biogas) or after new chemical transformations (agrofuel).
- biomass is lignocellulosic biomass.
- lignocellulosic biomass refers to material derived from plants or other organisms in which the carbohydrate content is substantially lignocellulose consisting of cellulose, hemicellulose and lignin (not less than 5% ). For example, it consists of wood and green residues, straw, straw briquettes, sugar cane bagasse, or fodder.
- Lignocellulosic biomass includes treated materials, such as paper with more than 5% lignin, but also natural raw materials such as agricultural waste. A mixture of water and / or other agents and solvents including ,
- lignocellulosic biomass as the main solid component can also be considered as lignocellulosic biomass as such.
- the lignocellulosic biomass is selected from the group consisting of herbaceous agricultural residues, silviculture residues, municipal solid waste, paper waste, pulp and stationary residues, or any combination of this.
- the lignocellulosic biomass according to the invention is chosen from a group comprising maize stalks and stalks, for example straw from rice, wheat, rye, oats, barley, lavandin, bagasse, miscanthus. , herbs, bamboo, water hyacinth, wood consisting of hardwood for example eucalyptus, coppice coppice, wood consisting of softwood for example acacia, softwood pulp ...
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for the degradation of the lignocellulosic biomass.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for the pretreatment of lignocellulosic biomass to be degraded.
- pretreatment is meant a manipulation of lignocellulosic biomass which renders its cellulosic components more accessible to enzymes converting carbohydrate polymers into fermentable sugars.
- the invention relates to the use of a composition
- a composition comprising a polypeptide of the invention (or a polynucleotide, a vector or a host cell of the invention) and an enzymatic cocktail of Trichoderma reesei cellulases for the degradation of the lignocellulosic biomass and / or for the pretreatment of the lignocellulosic biomass to be degraded.
- said composition may further comprise other native or mutated mannanases, Podospora anserina or other species, and other enzymes useful for the degradation of lignocellulosic biomass.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for the production of biofuels .
- the components of lignocellulosic biomass are suitable substrates for the production of biofuels.
- the polypeptides of the invention are used to convert the lignocellulosic biomass, the products thus obtained that can be used as biofuels (for example bioethanol, biobutanol) or as molecular components of such fuels (for example 3-hydroxypropionic acid, aspartic acid, xylitol and gluconic acid).
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for well stimulation.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for the production of mannose or manno- oligosaccharides from plant compounds containing mannans.
- Such compounds include, but are not limited to, oil palm core, coconut, coconut, konjac, locust bean gum, guar gum, soybean, etc.
- Mannose is indeed a relatively rare resource with beneficial properties and used in food, pharmaceuticals, cosmetics, textiles and in the manufacture of polymers. It can be used as a raw material for the production of mannitol.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for the production of mannitol.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention as a dietary supplement.
- mannanases promote the degradation of food components containing mannan, thus releasing oligomannoses known to have beneficial properties for human and animal health, and help digestion by degrading polymers that are not easily degraded by organisms; they are especially useful to the body as prebiotics.
- the invention relates to a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention in the treatment of food compounds.
- mannanases can also be used in the extraction of palm oil: their application on oil palm cake, after a first extraction by pressure, allows an improvement of the yield, but also obtaining better quality oil palm kernels (because they contain less galactomannan fibers, anti-nutritive components in animal feed).
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for extraction. palm oil.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for extraction. Coffee.
- mannanases in coffee extraction allows the hydrolysis of galactomannans present in liquid coffee extracts, thus reducing the viscosity of these liquid extracts and reducing the consumption of enzymes and energy during extraction.
- the waste can be used for the production of mannose as described above.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention as a cooking ingredient.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for the bleaching of pulp.
- a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention may be used alone, or in combination with one or more other mannanase (s) (polypeptide (s), polynucleotide (s) ), vector (s), host cell (s) and / or composition (s) associated), native or mutated, with xylanases, endoglucanases, ⁇ -galactosidases, cellobiohydrolases ...
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for desizing and bleaching of textile fibers.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention in detergent compositions. .
- a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention may be used alone, or in combination with other mannanases, native or mutated, amylases, cellulases, lipases, pectinases, proteases and endoglucanases.
- Mannanases also show properties of interest to the pharmaceutical industry.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention for elimination. of biofilms.
- a polypeptide (polynucleotide, vector, host cell or composition) of the invention may be used alone, or in combination with detergents, other mannanases, native or mutated , from galactosidases, pectinases, xylanases, arabinoxylanases, proteases, beta-glucanases, cellulases, galactanases, endoglucanases, xylosidases, cutinases and lipases.
- the invention relates to the use of a polypeptide, a polynucleotide, a vector, a host cell and / or a composition of the invention in targeted or controlled release distribution over time.
- Such systems are widely used in the drug industry for the delivery of active ingredients to a given organ and / or for a defined period of time. They are made using systems based on mannopolymer gels that contain and transport the material.
- mannanase in such a system is the controlled release of the material by the partial or complete degradation of the gel, due to a specific change in the environment of the gel, for example pH and / or temperature, which activates mannanases. Mannanases also show applications in alcoholic fermentation and / or alcohol production processes.
- Another subject of the invention relates to a method for producing a fermentation product from lignocellulosic biomass, said method comprising the steps of:
- step (ii) saccharification of said liquefied product obtained in step (i) with an enzymatic cocktail
- step (iii) Fermentation of the saccharification product obtained in step (ii) using a fermenting microorganism.
- the enzymatic cocktail used in step (ii) is a composition of the invention, comprising in particular (a) a polypeptide, a polynucleotide, a vector and / or a host cell and (b) so optional, a cellulase cocktail of Trichoderma reesei.
- Another subject of the invention relates to a method for producing gluconic acid, xylonic acid and / or xylobionic acid, or for increasing the amount of gluconic acid, xylonic acid and / or xylobionic acid from lignocellulosic biomass, said method comprising the steps of:
- step (ii) saccharification of said liquefied product obtained in step (i) with an enzymatic cocktail.
- the enzymatic cocktail used in step (ii) is a composition of the invention, comprising in particular (a) a polypeptide, a polynucleotide, a vector and / or a host cell and (b) optionally a cocktail of Trichoderma reesei cellulases.
- Another subject of the invention relates to a method for increasing the production of sugars from lignocellulosic biomass, said method comprising the steps of:
- step (ii) saccharification of said liquefied product obtained in step (i) with an enzymatic cocktail.
- the enzymatic cocktail used in step (ii) is a composition of the invention, comprising in particular (a) a polypeptide, a polynucleotide, a vector and / or a host cell and (b) optionally a cocktail of Trichoderma reesei cellulases.
- the inventors have developed mutants of the Man5A and Man26A proteins of Podospora anserina, and have studied their activity, seeking to increase the efficiency of these enzymes, in particular to increase the effectiveness of enzymatic cocktails used for the degradation of lignocellulosic biomass.
- the two genes coding for the proteins Man5A (nucleotide sequence defined by SEQ ID NO: 2) and Man26A (nucleotide sequence defined by SEQ ID NO: 12) of Podospora anserina were each amplified with the primers defined by the SEQ ID sequences. NO: 20-21 and 22-23 respectively, inserted into the JMP61 expression vector, associated with a secretion peptide of preprolip2 (Bordes et al., 2007, J. Microbiol Meth., 70, 493) and placed under the control of the oleic acid POX2 inducible promoter.
- the Yarrowia lipolytica yeast cells were transformed with the obtained vectors (JMP61-Man5A and JMP61-Man26A). Positive transformants were selected on plates comprising galactomannan. They were able to produce functional Man5A and Man26A enzymes at a level of 10.4 +/- 0.2 and 11.2 +/- 0.6 U.mL-1 in vitro.
- the mutant G311S defined by the protein sequence SEQ ID NO: 4, and encoded by the sequence SEQ ID NO: 15,
- mutant K139R / Y223H defined by the protein sequence SEQ ID NO: 6, and encoded by the sequence SEQ ID NO: 16,
- mutant V256L / G276V / Q316H defined by the sequence SEQ ID NO: 8, and encoded by the nucleic sequence SEQ ID NO: 17, and
- the mutant W36R / I195T / V256A defined by the sequence SEQ ID NO: 10, and encoded by the nucleic sequence SEQ ID NO: 18.
- Mutant P140L D416G defined by the sequence SEQ ID NO: 14, and encoded by the nucleic sequence SEQ ID NO: 19.
- the strain expressing the Man26A mutant P140L / D416G showed an increase in activity on the galactomannan hydrolysis reaction of 147% compared to a strain expressing the native Podospora anserina Man26.
- the strains expressing the mutants of Man5A showed an increase in the activity of 46, 9, 20 and 11% respectively for the mutants V256L / G276V / Q316H, W36R / I195T / V256A, K139R / Y223H, G311S compared to a strain of Yarrowia lipolytica expressing the Man5 A protein of native Podospora anserina.
- the inventors then wanted to evaluate more precisely the interest of these mutants from an enzymatic point of view, especially for the degradation of lignocellulosic biomass. They therefore studied the hydrolysis profile of galactomannan for each of them.
- the mutants were produced in the Pichia pastoris expression system, to obtain expression levels higher than those obtained in the Yarrowia lipolytica expression system.
- the genes encoding the native Man5A and Man26A proteins of Podospora anserina and the mutants developed were each amplified with the primers defined by the sequences SEQ ID NO: 20-23 (primers defined by the sequences SEQ ID NO: 20-21 for Man5A and its mutants, primers defined by the sequences SEQ ID NO: 22-23 for Man26A and its mutant), inserted into the expression vector pPICZaA, associated with the Saccharomyces cerevisiae pre-pro-factor a secretion sequence (Kjeldsen, 2000, Appl Microbiol Biotechnol 54 (3): 277-86) and the C-terminal (His) 6 tag sequence, placed under the control of the AOX promoter (lcohol oxidase).
- the expression vector used included a zeocin resistance gene. Pichia pastoris cells were transformed with the vectors obtained
- the hydrolysis capacity of galactomannan was evaluated.
- the determination of the kinetic parameters of each enzyme, native or mutated, on the hydrolysis reaction of galactomannan was carried out using the DNS activity test: 1 ⁇ g of each enzyme, native or mutated, was mixed with 190 ⁇ g of galactomannan and incubated at 40 ° C for 5 minutes. The reaction was stopped by adding 300 ⁇ L of DNS and the samples were placed for 10 minutes at 95 ° C. The OD540 optical density was measured relative to the mannose standard of 0 to 20 mM.
- One unit of mannanase activity endo-pI, 4-mannanase was defined as the amount of protein required for the release of 1 ⁇ of sugar monomer per minute.
- K ca , KM, and catalytic efficiency were measured for each enzyme, native or mutated.
- Table 1 Increased catalytic efficiency of each mutant relative to its native enzyme.
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1300467A FR3002775B1 (fr) | 2013-03-01 | 2013-03-01 | Polypeptides codant pour des mannanases mutees ayant une efficacite catalytique amelioree |
| PCT/EP2014/000517 WO2014131520A1 (fr) | 2013-03-01 | 2014-02-27 | Polypeptides codant pour des mannanases mutees ayant une efficacite catalytique amelioree |
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| Publication Number | Publication Date |
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| EP2986721A1 true EP2986721A1 (fr) | 2016-02-24 |
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| EP14709545.9A Withdrawn EP2986721A1 (fr) | 2013-03-01 | 2014-02-27 | Polypeptides codant pour des mannanases mutees ayant une efficacite catalytique amelioree |
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| Country | Link |
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| US (1) | US20160102299A1 (fr) |
| EP (1) | EP2986721A1 (fr) |
| CA (1) | CA2902772A1 (fr) |
| FR (1) | FR3002775B1 (fr) |
| WO (1) | WO2014131520A1 (fr) |
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| CN108559739B (zh) * | 2018-05-11 | 2021-03-26 | 中国农业科学院北京畜牧兽医研究所 | 耐热性提高的甘露聚糖酶PMan5A突变体及其基因和应用 |
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| US7846705B2 (en) * | 2006-07-18 | 2010-12-07 | Direvo Industrial Biotechnology Gmbh | Mannanases |
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- 2014-02-27 CA CA2902772A patent/CA2902772A1/fr not_active Abandoned
- 2014-02-27 EP EP14709545.9A patent/EP2986721A1/fr not_active Withdrawn
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| Publication number | Publication date |
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| WO2014131520A1 (fr) | 2014-09-04 |
| FR3002775A1 (fr) | 2014-09-05 |
| CA2902772A1 (fr) | 2014-09-04 |
| FR3002775B1 (fr) | 2016-09-30 |
| US20160102299A1 (en) | 2016-04-14 |
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