WO2002077223A1 - Nouvelle aminopeptidase et son gene - Google Patents
Nouvelle aminopeptidase et son gene Download PDFInfo
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- WO2002077223A1 WO2002077223A1 PCT/JP2002/002476 JP0202476W WO02077223A1 WO 2002077223 A1 WO2002077223 A1 WO 2002077223A1 JP 0202476 W JP0202476 W JP 0202476W WO 02077223 A1 WO02077223 A1 WO 02077223A1
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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)
- C12N9/58—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from fungi
- C12N9/62—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from fungi from Aspergillus
Definitions
- the present invention relates to aminopeptidase and a gene encoding the same.
- soy sauce is produced in two stages: koji making and fermentation. Mainly, in the koji-making stage, the raw materials are decomposed by enzymes produced by koji mold (Aspergillus spp.). At that time, it is important to increase the amount of free amino acids in the moromi in order to improve the taste in soy sauce.
- Amino acids are produced from raw protein in two steps. The first is the release of peptides from proteins by proteases, and the second is the production of amino acids by peptide hydrolysis catalyzed by peptides.
- Aspergillus peptidase has been reported from Aspergillus oryzae or Aspergillus soja (JP-A-11-346777, DE95-1952648, W09851163, W09628542 W09615504, W09851803 W09814599). Among them, the importance of leucine aminopeptidase in soy sauce production has been shown. However, there is no report that the known leucine aminopeptidase is salt-tolerant. In addition, the gene for Aspergillus leucine aminopeptidase is reported by Aspergillus' Soya by Kaizuki et al. (Japanese Patent Publication No. 11-346777), but no report is made on the salt tolerance of the enzyme.
- soybean aminopeptidase GX is a novel aminopeptidase that has not been reported so far, and its existence is not known other than germinated soybeans. Soy aminopeptidase GX has the activity of efficiently releasing N-terminal acidic amino acids from peptides having acidic amino acids such as glumic acid at the N-terminal. Therefore, by the action of this enzyme, it is possible to produce soy sauce having a high release rate of glutamic acid and excellent taste.
- the present invention provides an aminopeptidase derived from Aspergillus oryzae, which is effective for producing soy sauce or a degraded protein of soy sauce having a high free amino acid content and excellent taste, and a gene encoding the aminopeptidase.
- the purpose is to do.
- the present inventors conducted intensive research to solve the above-mentioned problems, and used Aspergillus' A. nidulans (EST), which is homologous to the soybean-derived aminopeptidase GX gene, as a probe.
- EST Aspergillus' A. nidulans
- the present invention provides a protein represented by any one of the following 3 (A) to (D): (A) having the amino acid sequence represented by amino acid numbers 1 to 519 in SEQ ID NO: 2 in the sequence listing; Protein
- a protein consisting of an acid sequence and having an activity of catalyzing a reaction for releasing an amino acid from the N-terminal of a peptide;
- the present invention also provides a nucleic acid molecule encoding any one of the above (A) to (D), a recombinant nucleic acid molecule containing the nucleic acid molecule, a transformed microorganism host, and an amino acid using the transformed microorganism host.
- This is a method for producing peptidase.
- the present invention includes transformed filamentous fungi, especially transformed koji molds, as transformed microorganism hosts.
- the present invention is an aminopeptidase with the following properties of 1) to 8) c
- the optimal temperature is about 37-45 ° C.
- FIG. 1 is a graph showing the temperature dependence of PepE activity.
- the horizontal axis represents temperature, and the vertical axis represents the relative value of leucine aminopeptidase activity when the activity value at 37 ° C is 100.
- FIG. 2 is a graph showing the effect of the salt concentration in the reaction solution on PepE.
- the horizontal axis is the NaCl concentration (M), and the vertical axis is the relative value of leucine aminopeptidase activity at the NaCl concentration when the activity value without NaCl was 100.
- FIG. 3 is a graph showing the pH dependence of PepE activity.
- the horizontal axis is pH, and the vertical axis is the relative value of leucine aminopeptidase activity when the activity value in potassium phosphate buffer (PH7.5) is 100.
- the present invention relates to a koji mold-derived aminopeptidase, a nucleic acid molecule encoding the same, a host of a transformed microorganism containing a recombinant DNA containing the nucleic acid molecule, and culturing the transformed microorganism host.
- a process for producing aminopeptidase in the present specification, the aminopeptidase protein derived from Aspergillus oryzae of the present invention may be referred to as PepE, and the gene encoding PepE may be referred to as pepE.
- aminopeptidase refers to a protein having an activity of catalyzing a reaction of sequentially releasing amino acids from the N-terminal of a peptide.
- the nucleic acid molecule encoding the aminopeptidase of the present invention may be Aspergillus nizi Can be obtained from the chromosomal DNA or cDNA of Urans. Specifically, it can be obtained from a chromosomal DNA library of Aspergillus nidulans, for example, Aspergillus nidulans A26 strain. Based on the gene sequence of aminopeptidase GX derived from germinated soybean (Japanese Patent Laid-Open No.
- a primer containing a nucleic acid molecule of the present invention can be obtained by PCR using Aspergillus nidulans chromosome DNA library type I as a type I primer.
- Examples of the primer for PCR include oligonucleotides having the base sequences shown in SEQ ID NOs: 6 and 6.
- nucleic acid molecule of the present invention can be obtained from a cDNA library prepared from Aspergillus nidulans poly (A) RNA by PCR using, for example, oligonucleotides having the nucleotide sequences of SEQ ID NOS: 8 and 9 as primers, It can be obtained by 5′-RACE using the oligonucleotides shown in 10 and 11 as primers.
- the nucleotide sequence of the genomic DNA containing the gene encoding PepE derived from Aspergillus nidulans A26 obtained as described above is shown in SEQ ID NO: 1.
- nucleotide sequence and amino acid sequence of cMA are shown in SEQ ID NO: 2, and the amino acid sequence alone is shown in SEQ ID NO: 3.
- amino acid sequence alone is shown in SEQ ID NO: 3.
- the nucleic acid molecule of the present invention may be any as long as it encodes the aminopeptidase of the present invention.
- DNA having a base sequence consisting of base numbers 72 to 1628 in the base sequence shown in SEQ ID NO: 2, 5 ′ Those excluding unnecessary parts on the terminal side are also included.
- "Nucleic acid molecule” also includes DNA, RNA and analogs thereof. Depending on the purpose for which it is used, it may encode only the mature protein.
- the nucleic acid molecule of the present invention also includes those in which the codon encoding each amino acid in the coding region is replaced with another equivalent codon encoding the same amino acid.
- nucleic acid molecules of the present invention Aminopeptidase containing one or more amino acid substitutions, deletions, insertions, additions, or inversions at one or more positions, as long as the activity of the aminopeptidase is not impaired. It may be a code.
- the term “plurality” varies depending on the position and the type of the amino acid residue in the three-dimensional structure of the peptidase protein, but usually 2 to 300, preferably 2 to 170, The number is more preferably 2 to 50, and most preferably 2 to 10.
- a nucleic acid molecule encoding a protein substantially the same as the aminopeptidase described above is prepared by, for example, site-directed mutagenesis so that amino acids at specific sites are substituted, deleted, inserted, or added. It is obtained by modifying the nucleotide sequence of pepE.
- the modified nucleic acid molecule as described above can also be obtained by a conventionally known mutation treatment.
- Examples of the mutation treatment include a method in which DNA encoding PepE is treated with hydroxyamine or the like, and a method in which a bacterium belonging to the genus Escherichia carrying DNA encoding PepE is exposed to ultraviolet light or N-methyl-N, A method of treating with a mutagen commonly used for artificial mutation, such as Nitrow N-nitrosoguanidine (NTG) or nitrite, may be used.
- NTG Nitrow N-nitrosoguanidine
- substitution, deletion, insertion, addition, or inversion of the base as described above also includes a naturally occurring mutation such as a difference depending on the species or strain of Aspergillus oryzae.
- a nucleic acid molecule having the above mutation in an appropriate cell and examining the PepE activity of the expression product, a nucleic acid molecule encoding a protein substantially identical to PepE can be obtained.
- nucleic acid molecule encoding PepE having a mutation or a cell carrying the same for example, a nucleic acid molecule having a base sequence consisting of base numbers 72 to 1628 of the base sequence shown in SEQ ID NO: 2 of the sequence listing and a string
- stringent conditions refers to the formation of so-called specific hybrids. The condition that is performed.
- nucleic acids having high homology such as 65% or more
- Conditions under which nucleic acid molecules having homology hybridize and nucleic acids having lower homology do not hybridize with each other, or under normal washing conditions for Southern hybridization at 60 ° C, lx SSC, 0.1% SDS ⁇ Preferred conditions include hybridization at a salt concentration corresponding to 0.1% SDS.
- Some of the genes that hybridize under these conditions may have a stop codon in the middle or have lost their activity due to mutations in the active center. It can be easily removed by connecting to a vector and measuring PepE activity by the method described later.
- the nucleic acid molecule of the present invention can also be obtained from a microorganism belonging to another species of the genus Aspergillus, for example, chromosomal DNA of Aspergillus oryzae or cDNA. Specifically, it can be obtained by PCR from Aspergillus oryzae, for example, a cDNA library of Aspergillus oryzae RIB40 (ATC C42149). Oligonucleotide primers for PCR were synthesized based on the nucleotide sequence of P.sup.E. It can be prepared by performing PCR.
- oligonucleotides having the nucleotide sequences shown in SEQ ID NOS: 12 and 13 for 5,1 RACE and oligonucleotides having the nucleotide sequences shown in SEQ ID NOs: 14 and 15 for 3, -RACE Pide As primers for PCR, oligonucleotides having the nucleotide sequences shown in SEQ ID NOS: 12 and 13 for 5,1 RACE and oligonucleotides having the nucleotide sequences shown in SEQ ID NOs: 14 and 15 for 3, -RACE Pide.
- the nucleotide sequence and the amino acid sequence of the gene cDNA corresponding to pepE of Aspergillus oryzae MB40 obtained as described above are shown in SEQ ID NO: 4, and the amino acid sequence alone is shown in SEQ ID NO: 5.
- the amino acid sequence of PaspE of Aspergillus nidulans shown in SEQ ID NO: 2 and the amino acid sequence of the corresponding aminopeptidase of Aspergillus oryzae shown in SEQ ID NO: 4 have a homology of about 77%. Then about 12 0 amino acid residues are different.
- the nucleic acid molecule of the present invention comprises An amino acid sequence represented by amino acid numbers 1 to 510 of SEQ ID NO: 4 comprising amino acids containing one or more amino acid substitutions, deletions, insertions, additions, or inversions; and A nucleic acid molecule encoding a protein having an activity of catalyzing a reaction for releasing a nucleic acid.
- the nucleic acid molecule of the present invention is a nucleic acid molecule having a base sequence consisting of base numbers 73 to 1602 of the base sequence shown in SEQ ID NO: 4 in the sequence listing under stringent conditions. And a nucleic acid molecule encoding a protein having an activity of catalyzing a reaction of releasing an amino acid from a peptide.
- the nucleic acid molecule of the present invention is DNA obtained as described above. Since the nucleotide sequence was clarified, the genomic DNA of Aspergillus nidulans A26 or Aspergillus oryzae RIB40, or other strains of Aspergillus nidulans or Aspergillus oryzae, was obtained from these strains by PCR or hybridization. Nucleic acid molecules encoding the corresponding aminopeptidase can be readily cloned. Accordingly, such nucleic acid molecules are also within the scope of the present invention.
- the nucleic acid molecule of the present invention can be used for producing the aminopeptidase of the present invention.
- the nucleic acid molecule of the present invention can be used for breeding filamentous fungi such as Aspergillus or producing aminopeptidase PepE.
- the DNA encoding the aminopeptidase of the present invention is introduced into a filamentous fungal (eg, Aspergillus oryzae) cell, preferably in multiple copies, to reduce PepE activity. Can be increased.
- the nucleic acid molecule of the present invention is expressed in a suitable host. Thereby, PepE can be manufactured.
- the filamentous fungi such as Aspergillus or the like obtained therefrom or PepE obtained therefrom can be used for producing soy sauce, miso, and other seasonings containing protein hydrolysates.
- filamentous fungi into which the nucleic acid molecule of the present invention is introduced examples include Aspergillus oryzae, Aspergillus niger (A. niger), Aspergillus genus such as Aspergillus nidulans, and neurospora such as Neurospora crassa. And filamentous fungi belonging to the genus Rhizomucor such as Rhizomucor miehei. Aspergillus filamentous fungi are particularly preferred.
- the vector for introducing the nucleic acid molecule of the present invention into the filamentous fungus as described above is not particularly limited, and those usually used for breeding the filamentous fungus and the like can be used.
- vectors used for Aspergillus oryzae include pUNG (Le e, BR et al., Appl. Microbiol. BiotechnoL, 44, 425-431 (1995)), pMAB, G (Tsuchiya, K. et al., Appl. Microbiol. BiotechnoL, 40, 327-332 (1993)), pUSC (Gomi, K. et al., Agric. Biol. Chem. 51, Z549-Z555 (1987)) and the like.
- pUNG is a marker that complements niaD— (nitrate utilization deficiency) of Aspernogillus oryzae niaD300 (Minetoki, T. et al., Curr. Genet. 30, 432-438 (1996)), and pMAUG is Aspergillus. Olize M2- 3 (Gomi, K. et al., Agric. Biol. Chem., 51 (9), 2549-2555 (1987)), a marker complementary to argB— (arginine requirement), pUSC Aspergillus' oryzae NS4 (YajDada, 0. et al., Biosci. Biotech. Biochem., 61 (8), 1367-1369 (1997)) You have it.
- pUNG and pMARG have the promoter for the glucoamylase gene (glaA) and the promoter for the amylase (amyB), and Downstream of the DNA of the present invention (for example, base number 7 in SEQ ID NO: 2)
- PepE can be expressed under control.
- pUSC does not contain a promoter overnight, when this is used, the host filamentous fungus is obtained by co-transformation of a plasmid such as pUC19 into which DM of the present invention has been inserted and pUSC. By introduction, PepE can be expressed.
- Aspergillus oryzae can be transformed as follows.
- DPY medium 2% glucose, 1% peptone, 0.5% yeast extract, ⁇ 5.0
- the culture solution is filtered with Miracloth (Myracloth. Manufactured by CALBIO CHEM) or sterilized gauze, etc., and the cells are collected, washed with sterilized water, and drained well.
- This cell is placed in a test tube, and an enzyme solution (1.0% Yatalase, manufactured by Takara Shuzo Co., Ltd.) or 0.5% Novozyme (NovoZye, manufactured by Novo Nordisk) and 0.5% cellulase (for example, Cellulase 0Nozuka, manufactured by Yakult Co.), 0.6M (NH 4) 2 S0 4 50IDM malic acid, pH 5.5) is added and shaken for about 3 hours gentle Ya or at 30 ° C. Observe the degree of protoplast formation under a microscope, and store it on ice if good.
- an enzyme solution (1.0% Yatalase, manufactured by Takara Shuzo Co., Ltd.
- Novozyme Novozyme
- cellulase for example, Cellulase 0Nozuka, manufactured by Yakult Co.
- 0.6M (NH 4) 2 S0 4 50IDM malic acid, pH 5.5) is added and shaken for about 3 hours gentle Ya or at 30 °
- the enzyme reaction mixture was filtered through Miracloth to remove cell debris, and an equal volume of buffer A (1.2 M sorbitol, 50 mM CaCl 2 , 35 mM NaCl 2 , lOmM Tris-HC1, pH 7.5) was added to the filtrate containing protoplasts. And place on ice. After centrifugation at 0 ° C; 15.00-2,500 rpm for 5-10 minutes, stop gently, wash the pellet with buffer A, and suspend in an appropriate amount of buffer A. To a 100-200 / 1 protoplast suspension, add 20/1 or less DNA solution (5-: LO zg) and place on ice for 20-30 minutes.
- buffer A 1.2 M sorbitol, 50 mM CaCl 2 , 35 mM NaCl 2 , lOmM Tris-HC1, pH 7.5
- buffer B (60% polyethylene glycol 6000, 50 mM CaCl 2 , lOmM Tris-HC1, pH 7.5) and mix gently.Add buffer 250 once and mix gently. Add 850 ⁇ 1 of buffer B, mix gently, and leave at room temperature for 20 minutes. Then, add 10 ml of buffer A, invert the test tube, and centrifuge at 0 ° C, l, 500-2,500 rpm for 5-10 minutes, and suspend the pellet in 500 l of buffer A.
- buffer B 60% polyethylene glycol 6000, 50 mM CaCl 2 , lOmM Tris-HC1, pH 7.5
- PepE a crude enzyme extract containing PepE can be obtained by diluting the culture with distilled water or the like and treating it with Stoma matsuri or the like. PepE can be further purified from the obtained crude extract by using gel filtration, various types of chromatography and the like.
- the obtained PepE can be further purified by salting out, isoelectric point precipitation, gel filtration, ion chromatography, reverse phase chromatography, etc., and used for protein degradation.
- the culture of the transformed microorganism having the PepE activity improved by introducing the nucleic acid molecule of the present invention is directly mixed with the protein material together with the protease to act on the protein or a mixture thereof, so that the free amino acid content is high, Strongly tasty protein hydrolyzate can also be obtained.
- the protein raw material to be acted on include soybean, wheat, wheat gluten and the like, and further, various proteins processed such as defatted soybean or puffed ⁇ soluble, or separated proteins from these various raw materials. You may.
- PepE activity was measured by adding 0.02 ml of crude enzyme extract and 0.015 ml of lOOmM zinc chloride to 0.75 ml of 1 mM Leu-pNA (50 mM sodium phosphate buffer, pH 7.5), and reacting at 37 ° C for 10 minutes. The reaction can be stopped by adding 0.25 ml of 40% acetic acid, and then measuring the absorbance at 405 nm of the reaction solution. The activity in the various preparations can be compared to the enzyme activity producing 1 mol of paranitroanilide per minute as 1 unit (U).
- the culture of the transformed microorganism may be mixed with a protein material having a concentration of 0.2 to 50% in the presence of a protease, and the mixture may be reacted at 5 to 60 ° C. for 4 hours to 10 days.
- Example 1 Cloning of pepE genomic DNA of Aspergillus nidulans Based on the sequence of aminopeptidase GX derived from germinated soybean, the EST database of Aspergillus nidulans (http: ⁇ ww. Genome.ou.edu/ Using fungal. html), a homology search was performed, and EST obd03al.fl with high homology was found.
- Aspergillus nidulans pepE was cloned from the Aspergillus nidulans genomic library as follows.
- Aspergillus nidulans genomic library was purchased from Fungal Genetics Stock Center (Kansas City, USA). In this library 1, Aspergillus nidulans genomic DM was cut with a restriction enzyme, ligated to a cosmid vector, and introduced into Escherichia coli. The screening of the library was performed as follows. That is, the target gene was obtained by PCR using Escherichia coli containing the cosmid drug Yuichi as a type I DNA source and using, as a primer, an oligonucleotide having the following sequence synthesized based on the base sequence of EST obd03al.fl. E. coli clones included were screened.
- SEQ ID NOs: 6 and 7 PCR primers
- Aspergillus nidulans A26 was cultured in YG medium (yeast extract 0.5%, glucose 2.5%, trace elements * 0.1%, pH 6.5) at 50 ° C with shaking at 30 ° C for 48 hours (trace elements *: FeS04 4 '73 ⁇ 40 0.1 %, ZnS0 4 -7H 2 0 0.88 %, CuS0 4 -53 ⁇ 40 0.04%, MnS0 4 - 43 ⁇ 40 0.015%, Na 2 B 4 0 7 -10H 2 0 0.01%, ( ⁇ 4) 6 ⁇ 0 24 ⁇ 43 ⁇ 40 0.005%).
- YG medium yeast extract 0.5%, glucose 2.5%, trace elements * 0.1%, pH 6.5
- pepE cDNA was cloned by PCR and 5'-RACE using oligonucleotides having the following sequences designed from Aspergillus' nidulans genomic DNA sequence as primers.
- CAC CAC CAT GAG TCT AAC TTG G (SEQ ID NO: 8)
- SEQ ID NOS: 8-11 PCR primers
- the PCR reaction conditions were: heat denaturation at 94 ° C for 9 minutes, 30 cycles of 94 ° C for 30 seconds, 55 ° C for 30 seconds, and 72 ° C for 30 seconds, followed by a reaction at 72 ° C for 5 minutes. Was done.
- an approximately 1800 bp DNA fragment was obtained by PCR using the primers of SEQ ID NOS: 8 and 9, and an approximately 250 bp amplified fragment was obtained by 5′-RACE using the primers of SEQ ID NOs: 10 and 11. .
- the nucleotide sequence of these DNA fragments and the amino acid sequence deduced from the nucleotide sequence are shown in SEQ ID NO: 2.
- Aspergillus oryzae RIB40 (ATCC42149) was cultured in 50 ml of DPY ⁇ 30 ml at 30 ° C. for 64 hours. The cells were collected by filtration, and 1 g was recovered. The cells were immediately frozen with liquid nitrogen and ground in a mortar, and then total RNA was obtained using the RNeasy Plant Mini Kit (QIAGEN). MRNA was purified from the MA using the mA Purification Kit (Pharmacia), and the cDNA library was purified using the cDNA PGR library kit (TaKa) or 3, -RACE System for Rapid Amplification of cDNA Ends (GIBC0 BRL). It was constructed.
- CDNA homologous to pepE of Aspergillus oryzae was cloned by 5'-RACE using the oligonucleotides shown in 12 and 13 as primers and 3'-RACE using SEQ ID NOs: 14 and 15 as primers.
- SEQ ID NO: 1 2-15 PCR primer
- the RACE PGR reaction is performed after heat denaturation at 95 ° C for 9 minutes, then at 94 ° C for 30 seconds, at 53 ° C for 30 seconds, and at 72 ° C.
- nucleotide sequence of the above gene fragment revealed that it contained a full-length pepE homologous sequence.
- This nucleotide sequence and the amino acid sequence encoded by the nucleotide sequence are shown in SEQ ID NO: 4. In addition, only the amino acid sequence is shown in SEQ ID NO: 5.
- the Escherichia coli DH5 strain transformed with the plasmid obtained by inserting this gene sequence into the plasmid pBluescript was attached with a private nanno AJ13858, and was researched on March 19, 2001 by the Ministry of Economy, Trade and Industry. Deposited at Tokoro Biotechnology Industrial Technology Research Institute (currently, Japan Institute of Advanced Industrial Science and Technology, Sen-ichi Patent Patent Depositary, Tsukuba Ibaraki, Japan 1-1-1 Central No. 6, Postal Code 305-8566) Accession No. ⁇ P-1 8265 has been assigned and transferred to the International Depositary on March 11, 2002 as Accession No. FERM B P-7951 at Senichi Yuichi.
- Plasmid pBSAopepE was prepared by ligating Aspergillus oryzae pepE cDNA obtained in Example 3 to pBluescript Smal site. Convert pepE cDNA from this plasmid into Ec Cut out with oRI and Xbal, ligate the vector containing the marker gene niaD downstream of the glucoamylase promoter of pUNGl (Lee, BR et al., Applied Microbiology Biotechnology, 44, 425-431 (1995)) and transform it. A plasmid pNGAPE was prepared. Transformation was performed with this plasmid DNA zg.
- a conidia of Aspergillus oryzae niaD300 strain was inoculated in the DPY place, and cultured with shaking at 30 ° C for 24 hours.
- the culture was filtered through sterilized gauze, and the cells were collected and washed with sterilized water.
- the cells were placed in a test tube, 20 ml of an enzyme solution (1.0 atalase (Yatalase, manufactured by Takara Shuzo Co., Ltd.)) was added, and the mixture was gently shaken at 30 ° C. for 3 hours.
- the degree of protoplast formation was observed under a microscope and stored on ice.
- the enzyme reaction mixture was filtered with Miracloth to remove cell debris, and an equal amount of buffer A (1.2 M sorbitol, 50 mM CaCl 2 , 35 mM NaCl, 10 mM Tris-HCk PH7.5) was added to the filtrate containing protoplasts. And placed on ice. This was centrifuged at 0 ° C, 500 rpm for 5 minutes, gently stopped, and the pellet was washed twice with 10 ml of buffer A and suspended in 1 ml of buffer A.
- buffer A 1.2 M sorbitol, 50 mM CaCl 2 , 35 mM NaCl, 10 mM Tris-HCk PH7.5
- the transformant obtained as described above was cultured in wheat bran, and the aminopeptidase activity of the extract was measured.
- the aminopeptidase activity in the crude enzyme extract prepared as described above was measured as follows. That is, 0.02 ml of crude enzyme extract and 0.015 ml of lOOmM zinc chloride were added to 0.75 ml of ImM Leu-pNA (50 mM sodium phosphate buffer, pH 7,5), and reacted at 37 ° C for 10 minutes. The reaction was stopped by adding 0.25 ml of acetic acid. The activity was measured by measuring the absorbance at 405 nm of the reaction solution. The activity was defined as one unit (U) of the enzyme activity that produces 1 mol of paranitroanilide per minute. As a control, a crude enzyme extract was similarly prepared for a transformant obtained by transformation with vector DNA containing only a marker gene, and aminopeptidase activity was measured by the method described above.
- a medium was prepared by placing 20 g of wheat bran culture medium in a 300 ml flask and autoclaving at 120 ° C. for 20 minutes.
- a spore suspension of the PepE-high-expressing transformation prepared in Example 4 was prepared and inoculated into the medium.
- the medium inoculated with the spores was mixed well and cultured at 30 ° C for 5 days. On the way, 48 hours later, the medium was stirred to perform care.
- the bran koji produced as described above was immersed in 10 volumes (w / w) of 20 mM potassium phosphate buffer solution (pH 7.4), lmM EDTA 3 lm PMSF (phenyl methanesulfonyl fluoride). After standing at 16 ° C for 16 hours, the supernatant obtained by gauze filtration and centrifugation (4 ° C, 10 minutes, 7,500 rpm) was used as a crude enzyme extract.
- Ammonium sulfate was added to the crude enzyme extract to obtain a 403 ⁇ 4-60 ammonium sulfate precipitation fraction.
- This precipitate was dissolved in a 20 mM potassium phosphate buffer (pH 7.4). This was filtered through a filter having a pore size of 0.445111. Beforehand, 20 mM potassium phosphate buffer ( ⁇ 7 4) The filtrate was applied to a desalting column (HiTrap Desalting (25 ml) manufactured by Amersham Pharmacia) equilibrated with 150 m NaCl, and eluted with the same buffer. The obtained active fraction was concentrated by ultrafiltration.
- the sample obtained above was adsorbed on an anion exchange column (HiTrap Q-sepharose HP (25 ml) manufactured by Amersham Pharmacia) previously equilibrated with 20 mM potassium phosphate buffer (pH 7.4).
- the column was washed with 3 times the column volume of the same buffer. After washing, elution was performed by linearly increasing the NaCl concentration of the buffer solution from 0 M to 1 M in 20 times the column volume.
- the active fraction collected in the eluate was concentrated by ultrafiltration.
- the obtained sample was fractionated by gel filtration chromatography using HiLoad 26/60 Superdex 200pg (manufactured by Amersham Pharmacia). A sample was applied to this column which had been equilibrated with 20 mM phosphate buffer (pH 7.4) and 150 mM NaCl in advance, and eluted with the same buffer to collect an active fraction. Through the above operations, purified PepE was obtained.
- the aminopeptidase activity of this enzyme solution was measured as follows. That is, 0.02 ml of the crude enzyme extract was added to 0.73 ml of the substrate solution (ImM Leu-pNA, 50 mM sodium phosphate buffer (pH 7.5), 2 mM cobalt chloride) and reacted at 37 ° C for 10 minutes. Thereafter, the reaction was stopped by adding 0.25 ml of 40% acetic acid. The absorbance value of this reaction solution at 405 nm was measured, and the activity value was calculated. The activity was defined as one unit of the enzymatic activity for producing 1 mol of para-nitro-alilide per minute.
- Fig. 1 shows the relative activities when the activity value at 37 ° C is 100.
- Fig. 2 shows the relative activities when the activity value of the group without NaCl added was set to 100. This enzyme was found to have sufficient activity even under high concentrations of dietary salt.
- the purified enzyme was stored in 0-4 M NaCl, 20 mM phosphate buffer (pH 7.5) at 0 ° C for 24 hours, and the activity was measured in a reaction solution having the same salt concentration as the stored salt. The results are shown in Table 5. c Table 5. Stability of PepE in saline solution
- the present invention provides a means for obtaining a protein hydrolyzate having a high free amino acid content and a strong taste.
- aminopeptidase and a nucleic acid molecule encoding the same are provided which efficiently degrade peptides under the brewing of soy sauce containing a large amount of salt, thereby improving the taste of soy sauce or protein hydrolyzate. It is possible to further increase.
- the host introduced in a form capable of expressing the nucleic acid molecule of the present invention can be used to produce the protein of the present invention.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002576666A JPWO2002077223A1 (ja) | 2001-03-19 | 2002-03-15 | 新規アミノペプチダーゼおよびその遺伝子 |
EP02705238A EP1371725B1 (en) | 2001-03-19 | 2002-03-15 | Novel aminopeptidase and its gene |
DE60209467T DE60209467T2 (de) | 2001-03-19 | 2002-03-15 | Neue aminopeptidase und ihr gen |
BR0207889-9A BR0207889A (pt) | 2001-03-19 | 2002-03-15 | Proteìna, molécula de ácido nucleico codificando a mesma, molécula de ácido nucleico recombinante, hospedeiro de microorganismo transformado, processo para produzir uma aminopeptidase, e , aminopeptidase |
US10/664,958 US7087422B2 (en) | 2001-03-19 | 2003-09-22 | Aminopeptidase and the genes thereof |
Applications Claiming Priority (4)
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JP2001-78930 | 2001-03-19 | ||
JP2001078930 | 2001-03-19 | ||
JP2001293348 | 2001-09-26 | ||
JP2001-293348 | 2001-09-26 |
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US10/664,958 Continuation US7087422B2 (en) | 2001-03-19 | 2003-09-22 | Aminopeptidase and the genes thereof |
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WO2002077223A1 true WO2002077223A1 (fr) | 2002-10-03 |
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PCT/JP2002/002476 WO2002077223A1 (fr) | 2001-03-19 | 2002-03-15 | Nouvelle aminopeptidase et son gene |
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US (1) | US7087422B2 (ja) |
EP (1) | EP1371725B1 (ja) |
JP (1) | JPWO2002077223A1 (ja) |
CN (1) | CN1501975A (ja) |
AT (1) | ATE318898T1 (ja) |
BR (1) | BR0207889A (ja) |
DE (1) | DE60209467T2 (ja) |
WO (1) | WO2002077223A1 (ja) |
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CN108699122B (zh) * | 2016-01-06 | 2022-05-10 | 学校法人冲绳科学技术大学院大学学园 | 示出加水分解活性的新肽及其用途 |
CN112961848B (zh) * | 2021-02-24 | 2022-09-09 | 中国海洋大学 | 一种新型氨肽酶及其可溶性表达方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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SU975797A1 (ru) * | 1980-12-12 | 1982-11-23 | Предприятие П/Я Г-4740 | Способ выделени лейцинаминопептидазы из aSpeRGILLUS oRYZae |
EP0794253A2 (en) * | 1996-03-08 | 1997-09-10 | Ajinomoto Co., Ltd. | Aminopeptidase GX, and a method of hydrolyzing a protein with the same |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4221089A (en) * | 1988-09-13 | 1990-04-02 | General Hospital Corporation, The | Isolation, purification, and characterization of the aminopeptidases: ap2, ap1, and apx |
US5742297A (en) | 1994-11-04 | 1998-04-21 | Lockheed Martin Corporation | Apparatus and method for constructing a mosaic of data |
ATE268379T1 (de) | 1995-03-16 | 2004-06-15 | Novozymes As | Enzym mit aminopeptidaseactivität |
DE19526485A1 (de) | 1995-07-20 | 1997-01-23 | Roehm Gmbh | Rekombinant hergestellte Leucinaminopeptidase aus Aspergillus sojae |
WO1998014599A1 (en) | 1996-10-04 | 1998-04-09 | Novo Nordisk Biotech, Inc. | Carboxypeptidases from aspergillus oryzae and nucleic acids encoding same |
EP0984703B1 (en) | 1997-05-16 | 2003-04-09 | Novozymes Biotech, Inc. | Methods of producing protein hydrolysates |
CN1227363C (zh) | 1997-05-16 | 2005-11-16 | 诺沃奇梅兹生物技术有限公司 | 具有脯氨酰二肽氨肽酶活性的多肽和编码该多肽的核酸 |
JP3727780B2 (ja) | 1998-06-12 | 2005-12-14 | キッコーマン株式会社 | ロイシンアミノペプチダーゼ遺伝子、組み換え体dna及びロイシンアミノペプチダーゼの製造法 |
JP2000325090A (ja) | 1999-03-15 | 2000-11-28 | Ajinomoto Co Inc | 新規アミノペプチダーゼをコードするdna及び該アミノペプチダーゼの製造方法 |
US6303359B1 (en) * | 1999-03-15 | 2001-10-16 | Ajinomoto Co., Inc. | DNA molecule encoding new aminopeptidase, and method of producing the aminopeptidase |
-
2002
- 2002-03-15 BR BR0207889-9A patent/BR0207889A/pt not_active IP Right Cessation
- 2002-03-15 DE DE60209467T patent/DE60209467T2/de not_active Expired - Lifetime
- 2002-03-15 JP JP2002576666A patent/JPWO2002077223A1/ja active Pending
- 2002-03-15 WO PCT/JP2002/002476 patent/WO2002077223A1/ja active IP Right Grant
- 2002-03-15 EP EP02705238A patent/EP1371725B1/en not_active Expired - Lifetime
- 2002-03-15 CN CNA02806724XA patent/CN1501975A/zh active Pending
- 2002-03-15 AT AT02705238T patent/ATE318898T1/de not_active IP Right Cessation
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU975797A1 (ru) * | 1980-12-12 | 1982-11-23 | Предприятие П/Я Г-4740 | Способ выделени лейцинаминопептидазы из aSpeRGILLUS oRYZae |
EP0794253A2 (en) * | 1996-03-08 | 1997-09-10 | Ajinomoto Co., Ltd. | Aminopeptidase GX, and a method of hydrolyzing a protein with the same |
Non-Patent Citations (2)
Title |
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BLINKOVSKY A.M.: "A non-specific aminopeptidase from aspergillus", vol. 1480, 2000, pages 171 - 181, XP004278956 * |
VANKUYK P.A. ET AL.: "Analysis of two aspergillus nidulans genes encoding extracellular proteases", FUNGAL GENETICS AND BIOLOGY, vol. 29, 2000, pages 201 - 210, XP002952737 * |
Also Published As
Publication number | Publication date |
---|---|
CN1501975A (zh) | 2004-06-02 |
EP1371725B1 (en) | 2006-03-01 |
EP1371725A4 (en) | 2004-09-22 |
US7087422B2 (en) | 2006-08-08 |
DE60209467D1 (de) | 2006-04-27 |
EP1371725A1 (en) | 2003-12-17 |
BR0207889A (pt) | 2004-07-27 |
US20040219636A1 (en) | 2004-11-04 |
JPWO2002077223A1 (ja) | 2004-07-15 |
DE60209467T2 (de) | 2006-10-19 |
ATE318898T1 (de) | 2006-03-15 |
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