WO2006068148A1 - 組換え微生物 - Google Patents
組換え微生物 Download PDFInfo
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- WO2006068148A1 WO2006068148A1 PCT/JP2005/023390 JP2005023390W WO2006068148A1 WO 2006068148 A1 WO2006068148 A1 WO 2006068148A1 JP 2005023390 W JP2005023390 W JP 2005023390W WO 2006068148 A1 WO2006068148 A1 WO 2006068148A1
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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
- C12P21/00—Preparation of peptides or proteins
- C12P21/02—Preparation of peptides or proteins having a known sequence of two or more amino acids, e.g. glutathione
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/32—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Bacillus (G)
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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
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/75—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Bacillus
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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)
- C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
- C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
- C12N9/52—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from bacteria or Archaea
- C12N9/54—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from bacteria or Archaea bacteria being Bacillus
Definitions
- the present invention relates to a microorganism used for producing a useful protein or polypeptide, and a method for producing a protein or polypeptide.
- Industrial production of useful substances by microorganisms includes not only foods such as alcoholic beverages, miso and soy sauce, but also amino acids, organic acids, nucleic acid-related substances, antibiotics, carbohydrates, lipids, proteins, etc. Has a wide range of uses, and its use has spread to a wide range of fields from foods, medicines, daily necessaries such as detergents, cosmetics, and various ingredients.
- microorganisms originally have a wide variety of genes to cope with environmental changes in nature, and in industrial production of proteins and the like in which a limited production medium is used. Was not necessarily efficient.
- microorganisms have a variety of protein-degrading enzymes to decompose proteins and use them as nitrogen and carbon sources, which degrade the target proteins and the like, which is a major obstacle in the production of foreign proteins. It was.
- Patent Document 1 Japanese Patent No. 288909
- Patent Document 2 Japanese Patent No. 3210315
- Patent Document 3 Special Table 2001-527401
- Non-Patent Document 1 J. BacterioL, 158, 411, (1984)
- Non-Patent Document 2 J. BacterioL, 160, 15, (1984)
- Non-Patent Document 3 J. BacterioL, 160, 442, (1984)
- Non-Patent Document 4 Appl. Environ. Microbiol, 68, 3261, (2002)
- Non-Patent Document 5 Microbiology, 145, 3121-3127, (1999)
- the present invention relates to a gene that encodes a heterologous protein or polypeptide as a host using a microorganism in which the Bacillus subtilis acceptance IX gene or a gene corresponding to the gene is deleted or inactivated.
- a recombinant microorganism into which is introduced is provided.
- the present invention also provides a method for producing a protein or polypeptide using the recombinant microorganism.
- FIG. 1 A schematic diagram showing the preparation of a DNA fragment for gene deletion introduction by SOE-PCR and a method for deleting a target gene (substitution with a drug resistance gene) using the DNA fragment. is there.
- FIG. 2 Schematic illustration of preparation of DNA fragment for gene deletion by SOE-PCR, construction of plasmid for gene deletion introduction using the DNA fragment, and target gene deletion method using the plasmid It is shown.
- FIG. 3 Welcome 1 ⁇ : Culture supernatant of the lost strain and 9-deficient protease gene deletion strain (Kao9 strain), and the wild-type 168 strain of Bacillus subtilis and 8-fold deletion of protease gene (Kao8 strain) as controls The results of examining the protease activity of the fractions by protease zymogram are shown.
- FIG.4 Production of amylase-PreS2 fusion protein in the 9-fold protease gene deletion strain (Kao9 strain) and, as a control, the 8-fold protease gene deletion strain (Kao8 strain), were examined by Western blot using an anti-PreS2 antibody. Show the results.
- FIG.5 Production results of amylase-PreS2 fusion protein of 168 wild-type strains of Bacillus subtilis strain as a control, triple deletion strain (Kao3 strain), as a control, by Western blot using anti-PreS2 antibody Is shown.
- the present invention creates a host microorganism capable of improving the productivity of a protein or polypeptide, particularly by reducing the amount of proteolytic enzyme produced, and encodes the protein or polypeptide in the host microorganism.
- the present invention relates to providing a recombinant microorganism obtained by introducing a gene and providing a method for producing a protein or polypeptide using the recombinant microorganism.
- the present inventors searched for a proteolytic enzyme that acts unnecessary or harmful in the production of useful proteins or polypeptides using microorganisms. It was found in the medium that the enzymes and proteins were degraded during the secretory production of useful enzymes and proteins to reduce their yield.
- a host microorganism a microorganism strain that lacks or inactivates the Bacillus subtilis acceptance IX gene, the degradation of useful foreign enzymes and proteins can be greatly prevented, and an efficient enzyme protein Found that production of [0012] If the recombinant microorganism of the present invention is used, the target protein or polypeptide can be prevented from being decomposed, and these can be efficiently produced in large quantities.
- the identity of amino acid sequences and nucleotide sequences is calculated by the Lipman-Pearson method (Science, 227, 1435, (1985). More specifically, genetic information. It is calculated by analyzing the unit size to compare (ktup) as 2 using the search homology program of the processing software Genetyx-Win (software development).
- Host microorganisms for constructing the microorganism of the present invention include the Bacillus subtilis ⁇ IX gene (Nature, 390, 249-256, (1997), and JAFAN: Japan. Functi onal Analysis Network for Bacillus subtilis (BS ⁇ RF DB, http://bacillus.genome.ad.jp 8 update on June 17, 2003) or a gene corresponding to the gene They are desirable and they can be wild type or mutated. Specific examples include Bacillus bacteria such as Bacillus, Clostridium bacteria, and yeasts, with Bacillus bacteria being particularly preferred. Furthermore, Bacillus subtilis is particularly preferred because it has been clarified in whole genome information, has established genetic engineering and genome engineering technology, and has the ability to secrete and produce proteins and extracellularly.
- the gene to be deleted or inactivated is reported to encode the putative serine protease AprX in Bacillus subtilis, aElX gene (Microbiology, 14 5, 3121, ( 1999), gene number BG12567 (Nature, 390, 249-256, (1997)) and JAFAN: Japan Functional Analysis Network for Bacillus subtilis (BSORF DB, http: //bacillus.genome.ad.jp8 June 17, 2003 Update)), or a gene corresponding to the gene.
- the gene corresponding to the gene has the same function as that of the Bacillus subtilis gene, or 70% or more, preferably 80% or more, more preferably 90% or more, and still more preferably 95% in the reception gene and nucleotide sequence.
- genes derived from other microorganisms preferably derived from bacteria belonging to the genus Bacillus, having an identity of 98% or more, and specific examples include the BH1930 gene (aprX gene) of Bacillus halodurans. ) And Oceanobadllus ihe ygn2k OB2375 gene.
- another DNA fragment is inserted into the above gene, or the residue
- This can also be achieved by inactivating the target gene by methods such as transcription of the gene and mutation in the translation initiation control region, but preferably a method of physically deleting the target gene is used. More desirable.
- the gene to be deleted or inactivated may be other proteases known to be secreted extracellularly or bound to the cell surface layer.
- One or more gene deletions that encode a class may be combined.
- the construction of the microorganism of the present invention can be combined with deletion or inactivation of a gene group other than the protease in the cell, which is expected to have a greater effect on productivity improvement. Bacillus subtilis reception IX gene or a.
- Table 1 shows the genes that are expected to be effective. In this case, one or more genes selected from the nine genes corresponding to the valleys of ipr or aprE. NprB, nprE, bpr. It is preferably lost or inactivated.
- the am £ and nm £ genes that encode the major extracellular alkaline protease AprE and the neutral protease NprE, respectively, or the three genes corresponding to the gene are deleted or inactive.
- the target gene group can also be deleted or inactivated by conducting random gene deletions or inactive mutations followed by protein productivity assessment and gene analysis using appropriate methods. can do.
- the genome is constructed by incorporating it into the parent microorganism cell and causing homologous recombination twice in the two regions outside the target gene mutation site of the parent microorganism genome or two regions outside the target gene. It is possible to replace the above target gene with a deleted or inactivated gene fragment.
- a circular recombinant plasmid obtained by cloning a DNA fragment containing a part of the target gene into an appropriate plasmid is introduced into the parent microbial cell, and homologous recombination in a part of the target gene. It is also possible to inactivate by disrupting the target gene on the parental microbial genome.
- a method of causing homologous recombination similar to the above-described method using a randomly cloned DNA fragment, or a method such as a method of causing parental microorganisms to be stranded It can also be carried out by irradiation.
- the deletion-introducing DNA fragment used in this method is about 0.
- a drug resistance marker gene fragment is inserted between a 2-3 kb fragment and an approximately 0.2-3 kb fragment adjacent to the downstream side.
- the upstream fragment and downstream fragment of the deletion target gene and three fragments of the drug resistance marker gene fragment are prepared by the first PCR.
- the drug resistance marker gene is inserted at the downstream end of the upstream fragment.
- the three types of PCR fragments prepared in the first round were used as a saddle shape, and the second round PCR was performed using the upstream primer of the upstream fragment and the downstream primer of the downstream fragment, whereby the upstream fragment In the drug resistance marker gene sequence added to the downstream end and the upstream end of the downstream fragment, annealing with the drug resistance marker gene fragment occurs, and as a result of PCR amplification, the drug resistance marker is inserted between the upstream fragment and the downstream fragment. DNA fragments with the marker gene inserted can be obtained (Fig. 1).
- a spectinomycin resistance gene is used as a drug resistance marker gene, for example, using the primer set shown in Table 2 and an appropriate vertical DNA, Pyrobest DNA polymerase (Takara Shuzo) etc. Using enzyme kits, etc., under normal conditions shown in the book (PCR Protocols. Current Methods and Applications, Edited by BAWnite, Humana Press, pp251 (1993), Gene, 77,61, (1989), etc.) By performing SOE-PCR, DNA fragments for deletion introduction of each gene can be obtained.
- the DNA fragment for introduction of deletion obtained by force was transformed into a competent cell transformation method (J. Bacterio 1.93, 1925 (1967)) etc., the gene recombination occurs in the cell in the upstream and downstream homologous regions of the identical deletion target gene, and the target gene becomes a drug resistance gene.
- Replaced cells can be isolated by selection with drug resistance markers ( Figure 1). That is, when the deletion-introduced DNA fragment prepared using the primer set shown in Table 2 is introduced, the mouthpiece that grows on the agar medium containing spectinomycin is isolated and the target gene is deleted. Then, it can be confirmed by a PCR method using the genome as a cage, that it has been replaced with a spectinomycin resistance gene.
- a deletion-introducing DNA fragment prepared by SOE-PCR method was inserted.
- a two-step single crossover method using a deletion-introducing plasmid can also be used. The method will be described below.
- the deletion-introducing DNA fragment used in the present method is about 0.
- DNA fragment in which 2 to 3 kb fragments, and about 0.2 to 3 kb fragments adjacent downstream are bound is a DNA fragment in which 2 to 3 kb fragments, and about 0.2 to 3 kb fragments adjacent downstream are bound.
- a DNA fragment in which a drug resistance marker gene fragment such as a chloramfecole resistance gene is bound downstream or upstream of the DNA fragment can also be used.
- the first PCR prepares the upstream and downstream fragments of the deletion target gene, and if necessary, three fragments of the drug resistance marker gene fragment. At this time, the ends of the DNA fragments to be bound are prepared. Primers with a 10 to 30 base pair sequence added are used.
- each PCR fragment prepared in the first round is mixed to form a saddle, and the second round of PCR is performed using a pair of primers that are the most upstream and the most downstream in the target binding fragment, respectively.
- the desired DNA fragment for introducing a deletion can be prepared.
- a second PCR is performed using an upstream primer of the upstream fragment and a downstream primer of the drug resistance marker gene fragment.
- the deletion-introducing DNA fragment obtained by the above-described method or the like is not amplified in a host bacterium using a normal restriction enzyme and DNA ligase, and can be easily used as a plasmid DNA or a temperature-sensitive plasmid.
- a deletion-introducing plasmid is constructed by inserting the plasmid DNA into a removable plasmid DNA.
- Examples of plasmid DNA that is not amplified in the host fungus include, but are not limited to, for example, pUC18, pUC118, and pBR322 when Bacillus subtilis is used as the host.
- an upstream fragment or a downstream fragment inserted into the plasmid after transformation of the host bacterium with the plasmid for introducing the deletion is performed by a combinatorial cell transformation method (J. Bacteriol. 93, 1925 (1967)) or the like.
- a homologous recombination between the homologous region on the genome and the homologous region of the genome yields a transformant in which the deletion plasmid is fused into the host bacterial genomic DNA (Fig. 2).
- drug resistance by a single gene such as the chloramphee-chol resistance gene of the plasmid for introduction of deletion may be used as an index.
- the sequence of the upstream region and downstream region of the gene to be deleted such as the receptor IX gene or the gene corresponding to the receptor IX gene, Duplicates exist from the bacterial genome and the deletion-introducing plasmid!
- the upstream region or downstream region by introducing homologous recombination in the genome in a region different from the region homologous recombination at the time of obtaining the transformant, deletion introduction including a drug resistance marker gene is performed.
- deletion of the target gene such as the acceptor gene or the gene corresponding to the acceptor gene occurs (Fig. 2).
- Examples of the method for causing homologous recombination in the genome include the method of inducing competence (J. Bacteriol. 93, 1925 (1967)). Spontaneously induced even during cultivation in a normal medium. Homologous recombination occurs. Strains that have undergone homologous recombination within the genome as intended can be selected from bacterial strains that have become drug-sensitive because the drug resistance marker gene is lost at the same time and the drug resistance is lost. These strains are also extracted using genomic DNA and PCR. To confirm the deletion of the target gene.
- a resistance gene for a drug that acts bacteriostatically on the host cell such as chloramfecole
- a resistant strain carrying the drug resistance gene can grow, and a susceptible strain lacking the drug resistance gene cannot grow or die.
- penicillin antibiotics such as ampicillin
- the resistant strains to be killed are killed, while the susceptible strains are affected by ampicillin and the like.
- the proportion of susceptible strains increases.
- a sensitive strain can be selected efficiently by smearing and culturing the culture solution after concentration in this manner on an appropriate agar medium, and confirming the presence or absence of resistance to the marker drug of the colonies that appear by replica method etc. Is possible.
- the target protein or polypeptide produced using the microorganism of the present invention includes, for example, various industrial enzymes such as detergents, foods, fibers, feeds, chemicals, medicines, diagnostics, and proteins such as physiologically active factors. And polypeptides.
- industrial enzymes such as detergents, foods, fibers, feeds, chemicals, medicines, diagnostics, and proteins such as physiologically active factors.
- polypeptides include, for example, various industrial enzymes such as detergents, foods, fibers, feeds, chemicals, medicines, diagnostics, and proteins such as physiologically active factors. And polypeptides.
- the functions of industrial enzymes are categorized into oxidoreductase (Oxidoreductase), transferase (Transferase), hydrolase (Hydrolase), elimination enzyme (Lyase), isomeric enzyme (Isomerase), and synthetic enzyme (Ligase). / Synthetase) etc.
- Preferred examples include genes of hydrolases such as cellula
- cellulases belonging to family 5 are listed in the classification of polysaccharide hydrolases (Biochem. J., 280, 309 (1991)), among which cellulases derived from microorganisms, particularly from Bacillus bacteria. .
- Examples include alkaline cellulase having an acid sequence, and further, 70%, preferably 80%, more preferably 90% or more, still more preferably 95% or more, particularly preferably 98% or more of the amino acid sequence.
- An example is cellulase consisting of an amino acid sequence.
- a amylase derived from a microorganism can be mentioned, and a liquid amylase derived from a bacterium belonging to the genus Bacillus is particularly preferable.
- an alkaline amylase derived from a bacterium belonging to the genus Bacillus having the amino acid sequence ability represented by SEQ ID NO: 61, or 70%, preferably 80%, more preferably 90% or more, and still more preferably 95% from the amino acid sequence.
- proteases include serine proteases derived from microorganisms, particularly serine proteases derived from batinoles bacteria.
- the protein produced by the present invention include physiologically active proteins and enzymes derived from higher organisms such as humans, etc.
- Preferred examples include interferon Q ;, interferon / 3, Examples include growth hormone, salivary gland amylase, etc.
- a part of the domain constituting a physiologically active protein can also be expressed, such as the antigen recognition domain pre S2 of human hepatitis C virus antibody. Can be mentioned.
- the target protein or polypeptide gene has upstream a control region involved in transcription, translation, and secretion of the gene, that is, a transcription initiation control region including a promoter and a transcription initiation site, a ribosome binding site, and an initiation codon. It is desirable that one or more selected regions including a translation initiation control region and a secretory signal peptide region are combined in a proper form. In particular, it is preferable that three regions consisting of a transcription initiation control region, a translation initiation control region, and a secretory signal region are combined, and that the secretory signal peptide region is a batch.
- KSM-S237 strain (April 14, 2003, Tsukuba, Ibaraki, Japan, 305-8566) East 1-chome 1 1 Chuo 6th, National Institute of Advanced Industrial Science and Technology, Patent Biological Deposit Center, deposited as FERM BP-7875), KSM-64 (April 14, 2003, 305-8566 Japan) 1st, 1st, Tsukuba, Higashi, Ibaraki Pref. 6th Central, Deposited as FERM BP-2886 at the National Institute of Advanced Industrial Science and Technology (AIST) It is desirable that the secretory signal peptide region is properly bound to the structural gene of the target protein or polypeptide.
- a DNA fragment comprising a nucleotide sequence having an identity of 70% or more, preferably 80% or more, more preferably 90% or more, more preferably 95% or more, particularly preferably 98% or more, or the above DNA fragment strength consisting of a base sequence in which a part of the base sequence is deleted. It is desirable that the DNA is properly bound to the structural gene of the target protein or polypeptide.
- a DNA fragment consisting of a base sequence from which a part of the above base sequence has been deleted is a part of the above base sequence that has been deleted, but functions related to gene transcription, translation, and differentiation. It means a DNA fragment that holds and holds.
- the recombinant plasmid of the present invention can be obtained by incorporating a recombinant plasmid obtained by binding a DNA fragment containing the above target protein or polypeptide gene and an appropriate plasmid vector into a host microorganism cell by a general transformation method. Microorganisms can be obtained. In addition, the recombinant microorganism of the present invention can also be obtained by using a DNA fragment in which an appropriate homologous region with the host microorganism genome is bound to the DNA fragment and directly integrating it into the host microorganism genome.
- Production of the target protein or polypeptide using the recombinant microorganism of the present invention involves inoculating the strain with a medium containing an anabolic carbon source, nitrogen source and other essential components, Culture may be performed by microbial culture, and after completion of the culture, the protein or polypeptide may be collected and purified.
- the composition of the medium is not particularly limited. Preferably, better results can be obtained by using a medium containing maltose or maltooligosaccharide as a carbon source.
- a host microbial mutant strain in which one or more genes selected from one of the Bacillus subtilis genes shown in Table 1 or a gene corresponding to the gene have been deleted or inactivated , And the mutant strain can be used to construct a recombinant microorganism, and by using this, a useful protein or polypeptide can be efficiently produced.
- 168 strains of Bacillus subtilis Use the extracted genomic DNA as a saddle type, and use the eprRvl and eprUpr, and eprDNf and eprrv-r-marked primer sets shown in Table 2 to flank the SE £ gene upstream of the genome.
- a 0.6 kb fragment (A) and a 0.5 kb fragment (B) adjacent downstream were prepared.
- the mril gene derived from plasmid pUB110 (Plasmid 15, 93 (1986)) is upstream of the chloramphenicol resistance gene derived from plasmid pC194 (J. Bacteriol. 150 (2), 815 (1982)).
- a 1.2 kb fragment (C) ligated with the promoter region (Nucleic Acids Res. 17, 4410 (1989)) was prepared.
- the obtained (A) (B) (C) 3 fragments were mixed to form a cage, and SOE-PCR using the primers epri 2 and Cmrv2 in Table 2 was performed to obtain 3 fragments (A) (B)
- the DNA fragments were combined in the order of (C) to obtain a 2.2 kb DNA fragment (see Fig. 2).
- the ends of this DNA fragment were blunted and 5--phosphorylated and inserted into the restriction enzyme site of plasmid pUC118 (Methods Enzymol.
- the 1.2 kb fragment (C) is an o.4 kb fragment (D) containing the repUl and repUr-Cm primer sets (Table 2) and the en gene promoter region prepared using plasmid pUBiio as a cage.
- D o.4 kb fragment
- E 0.8 kb fragment
- the plasmid pUC118-Cmr A epr for gEE gene deletion constructed in Example 1 was introduced into Bacillus subtilis 168 strain by the combinatorial cell transformation method (J. Bacteriol. 93, 1925 (1967)), and the upstream region of the gene, Alternatively, a transformant fused with genomic DNA by homologous recombination between the corresponding regions in the downstream region was obtained using chloramfecol resistance as an index. The obtained transformant is inoculated into LB medium, cultured at 37 ° C for 2 hours, and then subjected to the competence induction operation, so that the upstream region of the SEE gene that exists redundantly on the genome, or Intragenomic homologous recombination was induced between the downstream regions.
- ampicillin enrichment was performed as follows. The culture solution after induction of the competent cell was inoculated to 1 mL of LB medium containing 5 ppm final concentration of chloramphecoal and final lOOppm ampicillin sodium so that the turbidity (OD600) at 600 nm was 0.003.
- deletion of ⁇ gene was performed in the same manner as ⁇ EI gene deletion as the next deletion. That is, the gene deletion plasmid PUC118-C mr AwprA was constructed in the same manner as in Example 1, and the gEE gene was obtained by introducing the constructed plasmid into the genomic DNA and subsequent deletion of the ⁇ ⁇ gene by homologous recombination in the genome. And a double deletion strain of 5 ⁇ gene. By repeating the same procedure thereafter, the mm :, nprB. EE, I £, heavy, and SElE genes were deleted in sequence, and finally the protease 8-fold deletion strain in which 8 types of protease genes were deleted. And was named Kao8 strain.
- the primer sequences used for each deletion are shown in Table 2, and the correspondence between each primer and the primer used for gene deletion shown in Example 1 is shown in Table 3.
- Example 4 Construction of a IX gene deletion strain (replacement with a betatinomycin resistance gene)
- the spectinomycin-resistant gene region was excised from the BamHI and Xhol restriction enzyme cleavage points of plasmid pDG1727 (Gene, 167, 335, (1995)), and ⁇ lHI and 20 ⁇ 1 restriction were made in pBluescript II SK (+) (Stratagene).
- PBlueSPR was constructed by inserting at the enzyme cleavage point.
- the Spectinomycin resistance gene region was amplified using the PBlueSPR DNA as a saddle and the primer sets PB-M13-20 and PB-M13Rev (Table 1) (H).
- DNA fragments of (F), (G), and (H) were converted into DNA fragments and bound in the order of (E) (H) (G) by SOE-PCR using aprX + 5F and aprX + 1320R primer sets.
- the prepared DNA fragment was prepared.
- 168 strains of Bacillus subtilis were transformed by the competent cell transformation method, and colonies grown on LB agar medium containing spectinomycin (100 ⁇ g / mL) were isolated as transformants.
- the genome of the obtained transformant was extracted, and it was confirmed by PCR that the ⁇ IX gene was deleted and replaced with a spectinomycin resistance gene.
- a strain lacking the Bacillus subtilis reception IX gene was constructed and named ⁇ aprX (Sp) strain.
- Example 5 Construction of a 9-fold deletion strain of protease gene containing a deletion gene
- Example 6 Protease zymogram analysis of 9-deficient protease gene containing IX gene deletion
- Example 15 After culturing each gene deletion strain obtained in Example 15 and Bacillus subtilis 168 strain as a control for 100 hours, the culture solution was centrifuged at 10,000 rpm for 5 minutes, and the supernatant was diluted with 1 X sample buffer (62 Sample of protease zymogram solubilized to 5 mM Tris-HCl (pH 6.8), 5% 2-mercaptoethanol, 2% SDS, 5% sucrose, 0.002% BPB (Bromophenol blue)) It was.
- 1 X sample buffer 62 Sample of protease zymogram solubilized to 5 mM Tris-HCl (pH 6.8), 5% 2-mercaptoethanol, 2% SDS, 5% sucrose, 0.002% BPB (Bromophenol blue)
- the bacterial strain obtained in this way was cultured with shaking in 5 mL of LB medium at 30 ° C overnight, and 0.03 mL of this culture was added to 30 mL of 2xL-maltose medium (2% tryptone, 1% yeast extract, 1% NaCl, 7.5% maltose, 7.5 ppm manganese sulfate 4-pentahydrate, 15 ppm tetracycline), followed by shaking culture at 30 ° C. for 4 days. After culturing, the cells were removed by centrifugation, and the alkaline cellulase activity of the culture supernatant was measured, and the amount of alkaline cellulase secreted and produced outside the cells by culturing was determined.
- 2xL-maltose medium 2% tryptone, 1% yeast extract, 1% NaCl, 7.5% maltose, 7.5 ppm manganese sulfate 4-pentahydrate, 15 ppm tetracycline
- Recombinant plasmid pTUBE52-preS2 (165 bp) inserted with a DNA fragment (165 bp) ligated to the human hepatitis B virus antigen recognition PreS2 domain downstream of the N-terminal 522 amino acid coding region of the amylase gene derived from Bacillus subtilis Appl. Microbiol. BiotechnoL, 40, 341 (1993)) was introduced into the Kao8 and Kao9 strains obtained in Examples 3 and 5 by a conventional competent cell transformation method.
- the obtained transformed strain was cultured overnight at 30 ° C with shaking, and 0.03 mL of this culture was added to 30 mL of 2xL-maltose medium (2% tryptone, 1% yeast extract, 1% NaCl, 7.5% maltose, 7.5 ppm manganese sulfate 4-5 hydrate, 15 ppm tetracycline) and shaking culture at 30 ° C for 100 hours.
- 2xL-maltose medium 2% tryptone, 1% yeast extract, 1% NaCl, 7.5% maltose, 7.5 ppm manganese sulfate 4-5 hydrate, 15 ppm tetracycline
- the amount of amylase-PreS2 protein in the culture supernatant after removing the cells by centrifugation was determined by Western plot analysis using an anti-PreS2 antibody (Special Immunology Laboratories).
- the culture supernatant can be made into IX sample buffer (62.5 mM Tris-HCl (pH 6.8), 5% 2-mercaptoethanol, 2% SDS, 5% sucrose, 0.002% BPB (Bromophenol blue)). 7% after solubilization and 10% SDS-PAGE, blotting was performed on PVDF (polyvinyl difluonaine membrane: Immobilon; 0.45 ⁇ m pore size; Millipor e). An anti-preS2 antibody (Hyb-5520: Special Immunology Laboratory Inc.) was used as the primary antibody. Use a peroxidase-labeled anti-mouse IgG antibody (Amersham Pharmacia biotech) as a secondary antibody.
- IX sample buffer 62.5 mM Tris-HCl (pH 6.8), 5% 2-mercaptoethanol, 2% SDS, 5% sucrose, 0.002% BPB (Bromophenol blue)
- PVDF polyvinyl difluonaine membrane: Immobilon; 0.45 ⁇ m
- a microorganism was constructed in which a total of three protease genes including the acceptor IX gene were deleted. Construction of plasmid pUC118-Cmr A aprE for deletion of sm £ gene in the same manner as in Examples 1 and 2, and introduction of the constructed plasmid into Bacillus subtilis 168 strain genomic DNA followed by homologous recombination in the genome. A single deletion strain of the accepting IE gene was obtained.
- a protease gene triple deletion strain in which the three genes aprE, nprE, and aprX were deleted was constructed in the same manner as in Example 3, and named Kao3 strain.
- Table 3 shows the correspondence between the primers used when deleting the IX gene in the construction of the Kao3 strain and the primers used when deleting other protease genes.
- the plasmid pRUBE52-preS2 for amylase-PreS2 production was introduced into the Kao3 strain obtained in Example 9 and 168 strains of Bacillus subtilis as a control by a conventional combinatorial cell transformation method.
- the obtained transformed strain is shaken overnight at 30 ° C, and further Inoculate 30 mL of 2xL-maltose medium (2% tryptone, 1% yeast extract, 1% NaCl, 7.5% maltose, 7.5 ppm manganese sulfate 4-5 hydrate, 15 ppm tetracycline) Then, shaking culture was performed at 30 ° C for 25 hours.
- 2xL-maltose medium 2% tryptone, 1% yeast extract, 1% NaCl, 7.5% maltose, 7.5 ppm manganese sulfate 4-5 hydrate, 15 ppm tetracycline
- amylase-PreS2 protein in the culture supernatant after removing the cells by centrifugation was determined by Western plot analysis using an anti-PreS2 antibody (Special Immunology Research Institute, Inc.). As shown in Fig. 5, a strong amylase-PreS2 band detected in the control gene 168 (wild type) was detected in the protease gene triple deletion strain, and amylase-PreS2 productivity was detected. Improvement was confirmed.
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/722,162 US7829322B2 (en) | 2004-12-20 | 2005-12-20 | Recombinant microorganism comprising inactivation of the AprX gene |
| EP05820070.0A EP1829959B1 (en) | 2004-12-20 | 2005-12-20 | Recombinant microorganism |
| DK05820070.0T DK1829959T3 (da) | 2004-12-20 | 2005-12-20 | Rekombinant mikroorganisme |
| CN2005800438689A CN101084302B (zh) | 2004-12-20 | 2005-12-20 | 重组微生物 |
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| JP2004368166A JP4485341B2 (ja) | 2004-12-20 | 2004-12-20 | 組換え微生物 |
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| US (1) | US7829322B2 (ja) |
| EP (1) | EP1829959B1 (ja) |
| JP (1) | JP4485341B2 (ja) |
| CN (1) | CN101084302B (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101652468B (zh) * | 2007-04-10 | 2012-09-19 | 花王株式会社 | 重组微生物 |
| US20110104786A1 (en) * | 2007-10-31 | 2011-05-05 | Anita Van Kimmenade | Use and production of neutral metalloproteases in a serine protease-free background |
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| WO2024177043A1 (ja) | 2023-02-21 | 2024-08-29 | 花王株式会社 | リパーゼ変異体 |
| WO2024177042A1 (ja) | 2023-02-21 | 2024-08-29 | 花王株式会社 | リパーゼ変異体 |
| EP4671374A1 (en) | 2023-02-21 | 2025-12-31 | Kao Corporation | LIPASE VARIANT |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2006174707A (ja) | 2006-07-06 |
| US7829322B2 (en) | 2010-11-09 |
| CN101084302A (zh) | 2007-12-05 |
| EP1829959B1 (en) | 2013-05-29 |
| US20090081726A1 (en) | 2009-03-26 |
| JP4485341B2 (ja) | 2010-06-23 |
| EP1829959A4 (en) | 2009-04-08 |
| DK1829959T3 (da) | 2013-07-08 |
| CN101084302B (zh) | 2011-07-27 |
| EP1829959A1 (en) | 2007-09-05 |
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