US20080176300A1 - Microbial conversion of sugar acids and means therein - Google Patents

Microbial conversion of sugar acids and means therein Download PDF

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Publication number
US20080176300A1
US20080176300A1 US11/947,023 US94702307A US2008176300A1 US 20080176300 A1 US20080176300 A1 US 20080176300A1 US 94702307 A US94702307 A US 94702307A US 2008176300 A1 US2008176300 A1 US 2008176300A1
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Prior art keywords
acid
galactonic
enzyme protein
deoxy
converting
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Satu Hilditch
Merja Penttila
Peter Richard
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Valtion Teknillinen Tutkimuskeskus
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Valtion Teknillinen Tutkimuskeskus
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Priority to US14/062,121 priority Critical patent/US9340809B2/en
Assigned to TEKNOLOGIAN TUTKIMUSKESKUS VTT reassignment TEKNOLOGIAN TUTKIMUSKESKUS VTT CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: VALTION TEKNILLINEN TUTKIMUSKESKUS
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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
    • 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
    • C12N9/88—Lyases (4.)
    • 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
    • C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
    • C12P7/58—Aldonic, ketoaldonic or saccharic acids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Definitions

  • the present invention relates to enzymes involved in the conversion of sugar acids, and more precisely to an enzyme protein and its use and production. It further relates to DNA molecules encoding said enzymes, and to genetically engineered DNA-molecules and microorganisms comprising said DNA. The invention further relates to genetically modified microorganisms, wherein the enzyme-coding gene has been inactivated and to the use of such a microorganism.
  • D-galacturonic acid is the major component of pectin, a low price raw material enriched e.g. in sugar beet pulp, and a carbon source for microorganisms living on decaying plant material.
  • FIG. 1 The pathway of FIG. 1 has only been described for prokaryotic organisms, i.e. there are no reports about a similar pathway in eukaryotic microorganisms.
  • a pathway must exist in eukaryotic microorganisms, since many species of yeast and mould can utilize and grow on D-galacturonate, however very little is known about such a pathway.
  • the present invention is based on finding a novel gene and enzyme involved in the fungal metabolism of D-galacturonic acid. This finding reveals a putative metabolic pathway of D-galacturonic acid.
  • DNA comprising the gene may be used to produce genetically modified microorganisms, which are capable of effectively fermenting carbohydrates and their derivatives, such as sugar acids and their derivatives, from a biomaterial to obtain useful fermentation products, such as ethanol.
  • One aim of the invention is to provide an enzyme protein, which can be expressed by a host for the conversion of sugar acids and their derivatives to useful conversion products in a fermentation medium, or which is in the form of an enzymatic preparation for in vitro conversion of sugar acids and their derivatives to useful end products or intermediate products.
  • the invention provides an isolated DNA molecule comprising a gene encoding an enzyme protein capable of converting L-galactonic acid into L-threo-3-deoxy-hexulosonic acid.
  • the invention further provides a genetically engineered DNA molecule comprising said DNA molecule, and a genetically modified microorganism transformed with said genetically engineered DNA molecule.
  • the invention still further provides an enzyme protein capable of converting L-galactonic acid into L-threo-3-deoxy-hexulosonic acid, and a method of producing said enzyme by cultivating the genetically modified microorganism under conditions allowing expression of said protein, and recovering the enzyme protein.
  • a method of converting L-galactonic acid or D-arabonic acid to L-threo-3-deoxy-hexulosonic acid, or D-glycero-3-deoxy-pentulosonic acid, respectively by contacting L-galactonic acid or D-arabonic acid with said enzyme protein is also provided.
  • the invention further encompasses the use of the novel enzyme protein for producing a desired compound from a material comprising a sugar acid or a derivative thereof, and an enzyme preparation comprising said enzyme.
  • the invention still further encompasses a genetically modified microorganism, wherein a gene encoding an enzyme protein capable of converting L-galactonic acid into L-threo-3-deoxy-hexulosonic acid has been inactivated, and a method of producing L-galactonic acid or D-arabonic acid using the genetically modified microorganism.
  • FIG. 1 shows the bacterial pathway for D-galacturonic acid utilization.
  • FIG. 2 shows the putative fungal pathway for D-galacturonic acid utilization.
  • FIG. 3 shows the DNA sequence of the coding region and amino acid sequence for the L-galactonic acid dehydratase.
  • the upper lane indicates the DNA sequence, capital letters are for the coding sequence and small letters for the intron sequence.
  • the lower lane shows the amino acid sequence.
  • FIG. 4 shows the plasmid pBluekan7-1.NotI, which was used in deleting the L-galactonic acid dehydratase gene.
  • FIG. 2 A putative fungal pathway, which is distinctly different from the previously described bacterial pathway is summarized in FIG. 2 .
  • D-galacturonic acid is first converted to L-galactonic acid by a D-galacturonic acid reductase.
  • a gene for D-galacturonic acid reductase has been previously identified in plants and the enzyme activity has been described in yeast.
  • the present invention provides for the first time an isolated DNA molecule, which comprises a gene encoding an enzyme protein, which exhibits L-galactonic acid dehydratase activity.
  • isolated DNA molecule which comprises a gene encoding an enzyme protein, which exhibits L-galactonic acid dehydratase activity.
  • the isolation and identification procedure are described below.
  • the DNA sequence of the coding region and the amino acid sequence of the L-galactonic acid dehydratase is set forth in FIG. 3 .
  • the novel DNA molecule encodes an L-galactonic acid dehydratase, which converts L-galactonic acid to L-threo-3-deoxy-hexulosonic acid (also called 2-keto-3-deoxy-L-galactonic acid). It is also active with D-arabonic acid (also called D-arabinoic acid), which is converted to D-glycero-3-deoxy-pentulosonic acid (also called 2-keto-3-deoxy-D-arabonic acid). More generally the enzyme is active on sugar acids or their derivatives, where the hydroxyl group of C2 is in L and the hydroxyl group of C3 is in D configuration in the Fischer projection.
  • a sugar acid is a sugar oxidized at one or both ends.
  • a “derivative of a sugar acid” can be any compound obtainable from a sugar acid or being a homologue of a sugar acid, and having a carboxyl group in C1, a hydroxyl group in L configuration in C2 and in D configuration in C3.
  • the other C-atoms, and especially the end atom may comprise e.g. a methyl or an ester group.
  • the sugar acid or its derivative comprises five to six C-atoms, especially six C-atoms.
  • DNA molecule DNA sequence
  • nucleic acid sequence include both genome DNA and cDNA (complementary DNA).
  • the deposited nucleic acid sequence originates from the mould strain Hypocrea jecorina ( Trichoderma reesei ) Rut C-30 (ATCC 56765).
  • the deduced amino acid sequence of SEQ ID NO: 1 is set forth as SEQ ID NO: 2.
  • genes from different organisms encoding enzymes with the same catalytic activity have sequence similarities and these similarities can be exploited in many ways by those skilled in the art to clone other genes from other organisms with the same or similar catalytic activity.
  • genes are also suitable to practice the present invention. Therefore isolated DNA molecules obtainable from any organism, and especially from eukaryotic organisms such as fungi including yeast, plants, and animals including man are included in the invention.
  • the DNA molecule is derived from a filamentous fungus.
  • DNA molecules of the invention may be obtained e.g. in silico by comparing nucleotide sequences. If such sequences are not available one can identify a conserved region in the nucleotide or amino acid sequence and clone a gene fragment using PCR techniques. After sequencing the fragment the complete gene can be obtained e.g. by using a cDNA library in a vector as described by Richard et al. (2001) J. Biol. Chem., 276:40631-40637. Another way to identify an L-galactonic acid dehydratase gene is by conventional nucleic acid hybridization.
  • nucleotide sequence of a gene do not significantly change the catalytic properties of the encoded protein.
  • many changes in the nucleotide sequence do not change the amino acid sequence of the encoded protein.
  • an amino acid sequence may have variations, which do not change the functional properties of a protein, in particular they do not prevent an enzyme from carrying out its catalytic function.
  • Such variations in the nucleotide sequence of DNA molecules or in an amino acid sequence are known as “functional equivalents,” because they do not significantly change the function of the gene to encode a protein with a particular function, e.g. catalyzing a particular reaction or, respectively, change the particular function of the protein.
  • functional equivalents including fragments, of the nucleotide sequence of SEQ ID NO: 1, and of the amino acid sequence of SEQ ID NO: 2, respectively, are encompassed within the scope of the invention.
  • a functional equivalent of a nucleic acid sequence also includes nucleic acid sequences that are capable of hybridizing with the identified sequences under intermediate or high stringency conditions.
  • intermediate stringency hybridization can be performed in a hybridization mix containing 6 ⁇ SSC (0.9 M NaCl in 0.09 M sodium citrate, pH 7), 0.5% sodium dodecyl sulfate (SDS), 5 ⁇ Denhardt's solution and 100 ⁇ g/ml of Herring Sperm DNA at 50° C.
  • High stringency hybridization can be performed for example in the same hybridization mix at 68° C.
  • the invention is directed to a genetically engineered DNA molecule, i.e. a recombinant DNA, suitably to a vector, especially to an expression vector, which comprises the gene of the DNA molecule of the invention as described above so that it can be expressed in a host cell, i.e. a microorganism.
  • the gene of the invention may be operably linked to a promoter.
  • the vector can be e.g. a conventional vector, such as a virus, e.g. a bacteriophage, or a plasmid, preferably a plasmid.
  • the construction of an expression vector is within the skills of an artisan. The general procedure and specific examples are described below.
  • the present invention also makes it possible to generate a genetically modified organism in which this L-galactonic acid dehydratase activity is absent.
  • L-galactonic acid is accumulating, i.e. such an organism would be suitable to produce L-galactonic acid from D-galacturonic acid or from other substrates from which L-galactonic acid can be derived.
  • D-arabonic acid could be accumulated from D-arabinose.
  • the knowledge of the DNA sequence for L-galacturonic acid dehydratase can be used to inactivate the corresponding gene or genes in a suitable microorganism.
  • the gene can be inactivated e.g. by preventing its expression or by mutation or deletion of the gene or part thereof.
  • L-galactonic acid may be used e.g. as an acidifier in food industry, or it may be used in cosmetics or in concrete industry.
  • the DNA molecule coding for an L-galactonic acid dehydratase can be transferred to any suitable microorganism or the gene coding for an L-galactonic acid dehydratase can be deleted in any suitable microorganism.
  • a suitable microorganism can be suitable for the production of the desired conversion products or suitable to access the required substrates.
  • An example is a fungal microorganism, which is efficiently utilizing D-galacturonic acid. In this microorganism the deletion of the L-galactonic acid dehydratase would lead to an accumulation of L-galactonic acid during the fermentation process.
  • Another example is a microorganism where D-arabonic acid or L-galactonic acid is accumulating and the expression of the L-galactonic acid dehydratase facilitates the conversion of them to the desired reaction products.
  • the material to be utilized by said microorganisms of the invention comprises the sugar acid that is convertible in the presence of the L-galactonic acid dehydratase, or the microorganism is capable of expressing further genes to produce enzymes that are needed for the conversion of the starting material to a sugar acid utilizable by the said dehydratase expressed by the gene of the invention.
  • the starting material is preferably of natural origin i.e. a biomaterial e.g. biomass comprising sugar, sugar acids or derivatives thereof.
  • suitable biomaterial is sugar beet pulp, which comprises pectin, which mainly consists of D-galacturonic acid. Also other pectin comprising materials may be used.
  • biomass comprising a sugar acid or a derivative thereof is fermented by a microorganism transformed with a DNA molecule comprising a gene encoding an enzyme protein capable of converting L-galactonic acid into L-threo-3-deoxy-hexulosonic acid, and the desired compound produced is recovered. If the transformed microorganism further expresses an aldolase capable of converting L-threo-3-deoxy-hexulosonic acid into L-glyceraldehyde and pyruvate, and L-glyceraldehyde is further converted to e.g.
  • these metabolites can be converted by the microorganism to ethanol, lactic acid or any other compound metabolically derivable from these metabolites using the metabolic pathway of that microorganism.
  • Said pyruvate may also be further converted by the microorganism to ethanol through pyruvate decarboxylase and alcohol dehydrogenase, to lactic acid through lactate dehydrogenase, or to any other compound metabolically derivable from pyruvate.
  • the invention is not restricted to genetically modifying mould or yeast.
  • the genes encoding L-galactonic acid dehydratase can be expressed in any organism such as bacteria, plants or higher eukaryotes by applying the genetic tools suitable and known in the art for that particular organism.
  • the term “microorganism” should therefore be interpreted broadly to include also cell lines of higher organisms.
  • the L-galactonic acid dehydratase is produced by recombinant technology. This denotes the isolation of a fragment comprising the dehydratase gene by amplification in a PCR reaction (Coen, D. M., (2001) “The polymerase chain reaction,” published in: Ausubel, F. M., Brent, R., guitarist, R. E., More, D. D., Seidman, J. G., Smith, K. and Struhl, K. (eds.) Current Protocols in Molecular Biology, John Wiley & Sons. Inc., Hoboken, USA), or other recombinant DNA methods (Sambrook, J., Fritsch, E. F. and Maniatis, T.
  • the invention is further directed to an enzyme preparation comprising the L-galactonic acid dehydratase.
  • a preparation may be a crude cell extract of the genetically modified organism, or the enzyme may be further purified therefrom, whereby the preparation comprises at least the L-galactonic acid dehydratase in purified form.
  • the preparation may also comprise other enzymes taking part in the catabolism of sugars or sugar acids or their derivatives.
  • the invention provides the use of an L-galactonic acid dehydratase for the conversion of L-galactonic acid or D-arabonic acid or more generally for the conversion of sugar acids or their derivatives, where the hydroxyl groups of C2 and C3 are in L and D configuration, respectively, to the products described previously.
  • the Hypocrea jecorina ( Trichoderma reesei ) genome was screened for genes with homology to dehydratases.
  • the open reading frames were then amplified by PCR and ligated to a yeast expression vector.
  • PCR primers containing BamHI restriction sites were designed to amplify the open reading frames.
  • the PCR template was a H. jecorina cDNA library.
  • the PCR product was ligated to a TOPO vector (Invitrogen). From the TOPO vector the BamHI fragment was released and ligated to a yeast expression vector.
  • the expression vector was derived from the pYX212 plasmid (R&D Systems) by digesting it with EcoRI and XhoI to remove the ATG and HA-tag from the multiple cloning site and introducing a BamHI restriction site to the cloning site by inserting a EcoRI and SalI cut fragment from the pUC19 plasmid (Norrander, J., Kempe, T. and Messing, J. (1983) Gene, 26:101-106).
  • the S. cerevisiae strain which is overexpressing the L-galactonic acid dehydrogenase is called H3350 and is deposited with the deposition number DSM 17214.
  • L-galactonic acid was mixed with the yeast extract of strain H3350 as described in example 1.
  • the reaction product was identified as a 2-keto-3-deoxy sugar acid in a chemical assay and quantified as described by Buchanan et al. (1999) Biochem. J., 343:563-570.
  • the protein concentration of the yeast extract in the reaction medium was 0.15 g/l and the initial L-galactonic acid concentration 10 mM. After 21 hours 1.04 mM of L-threo-3-deoxy-hexulosonic acid was formed.
  • yeast extract as described before was mixed with the sugar acids D-gluconic acid, D-arabonic acid, D-xylonic acid, L-gulonic acid and L-galactonic acid.
  • D-gluconic acid D-arabonic acid
  • D-xylonic acid D-xylonic acid
  • L-gulonic acid L-galactonic acid
  • a deletion cassette was constructed.
  • 1.5 kb areas from both sides of L-galactonic acid dehydratase gene were cloned and ligated to the pBluekan7-1.NotI plasmid ( FIG. 4 ).
  • the part upstream the Igd1 was cloned using the oligos 5′-GAGCTCAAGCTTCCACGCAGTTGCTACTTCTA-3′ and 5′-GAGCTCTGGTTATTTGGCAGAGCGAC-3′ introducing SacI and HindIII restriction sites.
  • the SacI fragment was ligated to the SacI cloning site of the pBluekan7-1.NotI.
  • L-galactonic acid was mixed with the yeast extract of strain H3350 as described in Example 1.
  • the reaction product was identified by NMR.
  • the structure of the reaction product was verified by NMR spectroscopy and the 1 H and 13 C chemical shifts of the product are given in Table 1. From 1D 1 H spectrum of the reaction mixture the product signals were readily visible, and from 2D DQFCOSY and [ 1 H, 13 C]HSQC experiments it was evident, that the product has a proton spin-system CH2-CH—CH—CH2, in which one of the CH2 has typical chemical shifts of a hydroxymethyl group and the second one has quite unique chemical shifts typical to CH2 groups close to a keto group or a hemi-acetal structure. The DEPT spectrum further confirmed that the molecule has two CH2 and two CH type carbon atoms. In addition to these four carbons, the 13 C spectrum of the product revealed two additional carbon signals.

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