JP4463871B2 - Recombinant microorganism - Google Patents
Recombinant microorganism Download PDFInfo
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- JP4463871B2 JP4463871B2 JP2009095379A JP2009095379A JP4463871B2 JP 4463871 B2 JP4463871 B2 JP 4463871B2 JP 2009095379 A JP2009095379 A JP 2009095379A JP 2009095379 A JP2009095379 A JP 2009095379A JP 4463871 B2 JP4463871 B2 JP 4463871B2
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- 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
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- Enzymes And Modification Thereof (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Description
本発明は、有用なタンパク質又はポリペプチドの生産に用いる組換え微生物、及びタンパク質又はポリペプチドの生産方法に関する。 The present invention relates to a recombinant microorganism used for producing a useful protein or polypeptide, and a method for producing a protein or polypeptide.
微生物による有用物質の工業的生産は、アルコール飲料や味噌、醤油等の食品類をはじめとし、アミノ酸、有機酸、核酸関連物質、抗生物質、糖質、脂質、タンパク質等、その種類は多岐に渡っており、またその用途についても食品、医薬や、洗剤、化粧品等の日用品、或いは各種化成品原料に至るまで幅広い分野に広がっている。 The industrial production of useful substances by microorganisms includes a wide range of types including foods such as alcoholic beverages, miso and soy sauce, and amino acids, organic acids, nucleic acid-related substances, antibiotics, carbohydrates, lipids, and proteins. In addition, its application has been extended to a wide range of fields from foods, medicines, daily necessaries such as detergents and cosmetics to various chemical raw materials.
こうした微生物による有用物質の工業生産においては、その生産性の向上が重要な課題の一つであり、その手法として、突然変異等の遺伝学的手法による生産菌の育種が行われてきた。特に最近では、微生物遺伝学、バイオテクノロジーの発展により、遺伝子組換え技術等を用いたより効率的な生産菌の育種が行われるようになっており、遺伝子組換えのための宿主微生物の開発が進められている。例えば、枯草菌(Bacillus subtilis) Marburg No.168系統株の様に宿主微生物として安全かつ優良と認められた微生物菌株に更に改良を加えた菌株が開発されている。 In industrial production of useful substances by such microorganisms, improvement of productivity is one of the important issues, and breeding of produced bacteria by genetic techniques such as mutation has been performed as a technique. In recent years, the development of microbial genetics and biotechnology has led to more efficient breeding of production microorganisms using genetic recombination techniques, and the development of host microorganisms for genetic recombination has been promoted. It has been. For example, a strain obtained by further improving a microbial strain recognized as safe and excellent as a host microorganism, such as Bacillus subtilis Marburg No.168 strain, has been developed.
しかしながら、微生物は元来、自然界における環境変化に対応するための多種多様な遺伝子群を有しており、限定された生産培地が使用されるタンパク質等の工業的生産においては、必ずしも生産効率が高いとは言えない状況であった。 However, microorganisms originally have a wide variety of genes to cope with environmental changes in nature, and in industrial production of proteins and the like that use a limited production medium, production efficiency is not necessarily high. It was a situation that could not be said.
本発明は、タンパク質又はポリペプチドの生産性向上を可能とする宿主微生物にタンパク質又はポリペプチドをコードする遺伝子を導入して得られる組換え微生物、更に、当該組換え微生物を用いるタンパク質又はポリペプチドの製造法を提供することを目的とする。 The present invention relates to a recombinant microorganism obtained by introducing a gene encoding a protein or polypeptide into a host microorganism capable of improving the productivity of the protein or polypeptide, and a protein or polypeptide using the recombinant microorganism. The object is to provide a manufacturing method.
本発明者らは、微生物ゲノム上にコードされる各種遺伝子において、有用なタンパク質又はポリペプチドの生産にとって不要或いは有害な働きをする遺伝子群を鋭意探索したところ、枯草菌等の微生物の特定の遺伝子をゲノム上から削除又は不活性化した後、目的のタンパク質又はポリペプチドをコードする遺伝子を導入することにより、目的のタンパク質又はポリペプチドの生産性が、削除又は不活性化前と比較して向上することを見出した。 The present inventors diligently searched for genes that act unnecessary or harmful for the production of useful proteins or polypeptides in various genes encoded on the microbial genome. As a result, specific genes of microorganisms such as Bacillus subtilis are found. After the gene is deleted or inactivated from the genome, the gene encoding the protein or polypeptide of interest is introduced, so that the productivity of the protein or polypeptide of interest is improved compared to before the deletion or inactivation. I found out.
すなわち本発明は、枯草菌の遺伝子comA、yopO、treR、yvbA、cspB、yvaN、yttP、yurK、yozA、licR、sigL、mntR、glcT、yvdE、ykvE、slr、rocR、ccpA、yaaT、yyaA、yycH、yacP、hprK、rsiX、yhdK及びylbOのいずれか、又は当該遺伝子に相当する遺伝子のいずれか1以上の遺伝子が削除又は不活性化された微生物変異株に、異種のタンパク質又はポリペプチドをコードする遺伝子を導入した組換え微生物、特に異種のタンパク質又はポリペプチドをコードする遺伝子の上流に転写開始制御領域、翻訳開始制御領域、又は分泌用シグナル領域を結合した当該組換え微生物、また当該組換え微生物を用いたタンパク質又はポリペプチドの製造方法を提供するものである。 That is, the present invention, the Bacillus subtilis genes comA, yopO, treR, yvbA, cspB, yvaN, yttP, yurK, yozA, licR, sigL, mntR, glcT, yvdE, ykvE, slr, rocR, ccpA, yaaT, yyaA, yycH , YacP , hprK , rsiX , yhdK and ylbO , or a microbial mutant from which at least one of the genes corresponding to the gene is deleted or inactivated, encodes a heterologous protein or polypeptide Recombinant microorganism into which a gene has been introduced, particularly the recombinant microorganism in which a transcription initiation control region, a translation initiation control region, or a signal region for secretion is linked upstream of a gene encoding a heterologous protein or polypeptide, or the recombinant microorganism The present invention provides a method for producing a protein or polypeptide using
また本発明は、枯草菌の遺伝子yopO、treR、yvbA、cspB、yvaN、licR、sigL、glcT、yvdE、slr、rocR、yycH及びyacPのいずれか1以上の遺伝子が削除又は不活性化された枯草菌又はその他のバチルス属細菌株に、転写開始制御領域、翻訳開始制御領域及び分泌用シグナル領域が上流に結合した異種のタンパク質又はポリペプチドをコードする遺伝子を導入した組換え微生物であって、当該転写開始制御領域、翻訳開始制御領域及び分泌シグナル領域が、配列番号1で示される塩基配列からなるセルラーゼ遺伝子の塩基番号1〜659の塩基配列、配列番号3で示される塩基配列からなるセルラーゼ遺伝子の塩基番号1〜696の塩基配列又は当該塩基配列のいずれかと90%以上の同一性を有する塩基配列からなり、且つ転写開始制御機能、翻訳開始制御機能及び分泌用シグナル機能を有するDNA断片である、組換え微生物、また当該組換え微生物を用いた異種タンパク質又はポリペプチドの製造方法を提供するものである。
一態様において、前記異種のタンパク質又はポリペプチドは、バチルス属細菌由来のアルカリセルラーゼ又はアルカリアミラーゼである。
The present invention also relates to a hay that has been deleted or inactivated from one or more genes of Bacillus subtilis genes yopO , treR , yvbA , cspB , yvaN , licR , sigL , glcT , yvdE , slr , rocR , yycH and yacP. A recombinant microorganism in which a gene encoding a heterologous protein or polypeptide in which a transcription initiation control region, a translation initiation control region, and a secretion signal region are linked upstream is introduced into a bacterium or other bacterial strain of the genus Bacillus, The transcription initiation control region, the translation initiation control region, and the secretion signal region have a base sequence of base numbers 1 to 659 of the cellulase gene comprising the base sequence represented by SEQ ID NO: 1, and a cellulase gene comprising the base sequence represented by SEQ ID NO: 3 It consists of a base sequence of base numbers 1 to 696 or a base sequence having 90% or more identity with any of the base sequences, and a transcription initiation control function, The present invention provides a recombinant microorganism which is a DNA fragment having a translation initiation control function and a secretion signal function, and a method for producing a heterologous protein or polypeptide using the recombinant microorganism.
In one embodiment, the heterologous protein or polypeptide is an alkaline cellulase or alkaline amylase derived from a Bacillus bacterium.
本発明の微生物は、目的タンパク質又はポリペプチドの生産にとって不要、或いは有害な遺伝子が削除、又は不活性化されているため、エネルギーロス、副産物の生産や比生産速度の低下等、培地の浪費が大幅に減少でき、また、タンパク質又はポリペプチドの生産期間が長期化することによって効率よく目的生産物を生産することができる。 In the microorganism of the present invention, genes that are unnecessary or harmful to the production of the target protein or polypeptide are deleted or inactivated. Therefore, waste of the medium such as energy loss, production of by-products and reduction of the specific production rate is lost. The target product can be produced efficiently by greatly reducing the production period of the protein or polypeptide.
本発明においてアミノ酸配列および塩基配列の同一性はLipman-Pearson法 (Science, 227, 1435, (1985))によって計算される。具体的には、遺伝情報処理ソフトウェアGenetyx-Win(ソフトウェア開発)のホモロジー解析(Search homology)プログラムを用いて、Unit size to compare(ktup)を2として解析を行うことにより算出される。 In the present invention, the identity of the amino acid sequence and the base sequence is calculated by the Lipman-Pearson method (Science, 227, 1435, (1985)). Specifically, it is calculated by performing an analysis with a unit size to compare (ktup) of 2 using a homology analysis (Search homology) program of genetic information processing software Genetyx-Win (software development).
本発明の微生物を構築するための親微生物としては、有用なタンパク質又はポリペプチドの生産にとって不要な遺伝子、具体的には表1に示す枯草菌の遺伝子又は当該遺伝子に相当する遺伝子を有するものであればよく、野生型のものでも変異を施したものでものよい。具体的には、枯草菌などのバチルス(Bacillus)属細菌や、クロストリジウム(Clostridium)属細菌、或いは酵母等が挙げられ、中でもバチルス(Bacillus)属細菌が好ましい。更に、全ゲノム情報が明らかにされ、遺伝子工学、ゲノム工学技術が確立されている点、またタンパク質と菌体外に分泌生産させる能力を有する点から特に枯草菌が好ましい。 The parent microorganism for constructing the microorganism of the present invention has a gene unnecessary for the production of a useful protein or polypeptide, specifically, a Bacillus subtilis gene shown in Table 1 or a gene corresponding to the gene. It only needs to be wild-type or mutated. Specifically, and Bacillus (Bacillus) bacteria such as Bacillus subtilis, Clostridium (Clostridium) bacteria, or yeast, and among them B. (Bacillus) bacteria are preferred. Furthermore, Bacillus subtilis is particularly preferred from the viewpoint that whole genome information has been clarified, genetic engineering and genome engineering techniques have been established, and that protein and secretory production are possible.
本発明の微生物を用いて生産する目的タンパク質又はポリペプチドとしては、例えば食品用、医薬品用、化粧品用、洗浄剤用、繊維処理用、医療検査薬用等として有用な酵素や生理活性因子等のタンパク質やポリペプチドが挙げられる。 Examples of the target protein or polypeptide produced using the microorganism of the present invention include proteins useful for foods, pharmaceuticals, cosmetics, detergents, fiber treatments, medical tests, etc. And polypeptides.
例えば、枯草菌にはゲノム上に4106個の遺伝子が存在することが知られているが、本発明において削除、又は不活性の対象となる遺伝子群は、目的タンパク質又はポリペプチドの生産にとって不要或いは有害な働きをする遺伝子群であり、表1に示される枯草菌の遺伝子のいずれか、又は当該遺伝子に相当する遺伝子群の中から選択されるものである。斯かる遺伝子群は、目的タンパク質又はポリペプチドの生産には直接関与しておらず、また、通常の工業的生産培地における微生物の生育にも不要であることが本発明者らによって見出された。 For example, although it is known that Bacillus subtilis has 4106 genes on the genome, the gene group to be deleted or inactivated in the present invention is not necessary for the production of the target protein or polypeptide. A gene group that acts harmfully, and is selected from any of the Bacillus subtilis genes shown in Table 1 or a gene group corresponding to the gene. It has been found by the present inventors that such genes are not directly involved in the production of the target protein or polypeptide, and are unnecessary for the growth of microorganisms in a normal industrial production medium. .
尚、表中の各遺伝子の名称、番号及び機能等は、Nature, 390, 249-256, (1997) で報告され、JAFAN: Japan Functional Analysis Network for Bacillussubtilis (BSORF DB)でインターネット公開(http://bacillus.genome.ad.jp/、2003年6月17日更新)された枯草菌ゲノムデーターに基づいて記載している。 The names, numbers and functions of each gene in the table were reported in Nature, 390, 249-256, (1997), and published on the Internet at JAFAN: Japan Functional Analysis Network for Bacillus subtilis (BSORF DB) (http: / /bacillus.genome.ad.jp/, updated on June 17, 2003).
また、表1に示される枯草菌の各遺伝子と同じ機能を有する、または、表1の各遺伝子と塩基配列において70%以上、好ましくは80%以上、より好ましくは90%以上、さらに好ましくは95%以上、特に好ましくは98%以上の同一性を有する、他の微生物由来、好ましくはバチルス属細菌由来の遺伝子は、表1に記載の遺伝子に相当する遺伝子と考えられ、本発明において削除、不活性化すべき遺伝子に含まれる。尚、塩基配列の同一性はLipman-Pearson法 (Science, 227, 1435, (1985))によって計算される。 Moreover, it has the same function as each gene of Bacillus subtilis shown in Table 1, or 70% or more, preferably 80% or more, more preferably 90% or more, more preferably 95% in each gene and base sequence of Table 1. %, Particularly preferably 98% or more of the genes derived from other microorganisms, preferably from the genus Bacillus, are considered to be genes corresponding to the genes listed in Table 1, and are deleted or not used in the present invention. Included in the gene to be activated. The nucleotide sequence identity is calculated by the Lipman-Pearson method (Science, 227, 1435, (1985)).
表1に示される枯草菌の遺伝子群の中には、各種遺伝子発現の活性化や抑制に関わる制御遺伝子、或いは構造の類似性から制御遺伝子であろうと推定されるものが多く存在していることから、タンパク質又はポリペプチドの生産にとって不要或いは有害な遺伝子制御の存在が本発明によって明らかになった。 Among the gene groups of Bacillus subtilis shown in Table 1, there are many regulatory genes involved in activation and suppression of various gene expression, or genes that are presumed to be regulatory genes based on structural similarity. Thus, the present invention has revealed the presence of gene regulation that is unnecessary or harmful to the production of proteins or polypeptides.
特に、グルコースのPTS取り込み系オペロンのアンチターミネーターであるglcT遺伝子、リケナン分解系オペロンのアンチターミネーターであるlicT遺伝子、トレハロース取り込み、代謝系オペロンのリプレッサーであるtreR遺伝子、更には、グルコースカタボライトリプレッションに関わるccpA遺伝子やhprK遺伝子など、糖の取り込み、代謝に関わる制御遺伝子が多く存在しており、注目に値する。 In particular, GlcT gene is antiterminator of PTS uptake system operon glucose, LicT gene is antiterminator of lichenan catabolic operons, trehalose uptake, trer gene is a repressor of metabolic operon, further, to glucose catabolite repression There are many regulatory genes involved in sugar uptake and metabolism, such as the ccpA gene and hprK gene involved, and it is noteworthy.
その他、糖の取り込み、代謝に関わる制御遺伝子以外の制御遺伝子として、アルギニン資化の活性化に関与するrocR遺伝子やコンピテンス関連の制御遺伝子comA、slr等を削除又は不活性化することによりタンパク質又はポリペプチドの生産性が向上する。 In addition, as a control gene other than the control gene involved in sugar uptake and metabolism, the rocR gene involved in the activation of arginine utilization and the competence related control genes comA , slr etc. are deleted or inactivated to remove protein or poly Peptide productivity is improved.
また、表1に示される遺伝子群の中には、ECFシグマ因子のひとつであるシグマXの発現を抑制するアンチECFシグマ因子をコードするrsiX遺伝子、及び同じくシグマMの発現抑制に関与するとの報告例があるyhdK遺伝子(Mol Microbiol., 32, 41, (1999))などが存在し、また逆にシグマLをコードするsigL遺伝子が含まれており、シグマXやシグマMの制御下にある遺伝子の発現がタンパク質生産にとって好ましく、逆にシグマL制御下の何らかの遺伝子発現がタンパク質生産にとって好ましくないことが示唆されている。 In addition, in the gene group shown in Table 1, it is reported that the rsiX gene encoding an anti-ECF sigma factor that suppresses the expression of sigma X, which is one of the ECF sigma factors, and is also involved in the suppression of sigma M expression. There is a yhdK gene (Mol Microbiol., 32, 41, (1999)) with an example, and conversely, a sigL gene encoding sigma L is included, and the gene is under the control of sigma X and sigma M It is suggested that the expression of is not preferable for protein production, and conversely, any gene expression under the control of Sigma L is not preferable for protein production.
斯かる遺伝子群の中から選ばれる1又は複数の遺伝子を削除又は不活性化することにより、タンパク質又はポリペプチドの生産にとって不要な、或いは有害な遺伝子の発現が生じないため、当該タンパク質又はポリペプチドの生産において、その生産性の向上が達成される。 By deleting or inactivating one or more genes selected from such a group of genes, expression of genes that are unnecessary or harmful to the production of the protein or polypeptide does not occur, and therefore the protein or polypeptide In this production, the improvement in productivity is achieved.
尚、削除又は不活性化する遺伝子は1以上であればよく、複数、特に3以上が好ましく、更には5以上であることが好ましい。更に本発明の微生物の構築には、上記以外の遺伝子群の削除又は不活性化を組み合わせることも可能であり、生産性向上に対してより大きな効果が期待される。また、本発明は目的遺伝子中に他のDNA断片を挿入する、あるいは、当該遺伝子の転写・翻訳開始領域に変異を与える等の方法によって目的遺伝子を不活性化することによっても達成できるが、好適には、標的遺伝子を物理的に削除する方がより望ましい。 The number of genes to be deleted or inactivated may be 1 or more, more preferably 3 or more, and even more preferably 5 or more. Furthermore, the construction of the microorganism of the present invention can be combined with deletion or inactivation of genes other than those described above, and a greater effect is expected for improving productivity. The present invention can also be achieved by inactivating the target gene by inserting another DNA fragment into the target gene or by mutating the transcription / translation initiation region of the gene. For this, it is more desirable to physically delete the target gene.
遺伝子群の削除又は不活性化手順としては、表1に示した標的遺伝子を計画的に削除又は不活性化する方法のほか、ランダムな遺伝子の削除又は不活性化変異を与えた後、適当な方法によりタンパク質生産性の評価及び遺伝子解析を行う方法が挙げられる。 As a gene group deletion or inactivation procedure, in addition to the method of systematically deleting or inactivating the target genes shown in Table 1, random gene deletion or inactivation mutations are applied, and then appropriate procedures are performed. Examples of the method include evaluation of protein productivity and gene analysis.
標的とする遺伝子を削除又は不活性化するには、例えば相同組換えによる方法を用いればよい。すなわち、標的遺伝子の一部を含むDNA断片を適当なプラスミドベクターにクローニングして得られる環状の組換えプラスミドを親微生物細胞内に取り込ませ、標的遺伝子の一部領域に於ける相同組換えによって親微生物ゲノム上の標的遺伝子を分断して不活性化することが可能である。或いは、塩基置換や塩基挿入等によって不活性化した標的遺伝子、又は標的遺伝子の外側領域を含むが標的遺伝子を含まない直鎖状のDNA断片等をPCR等の方法によって構築し、これを親微生物細胞内に取り込ませて親微生物ゲノムの標的遺伝子内の変異箇所の外側の2ヶ所、又は標的遺伝子外側の2ヶ所の領域で2回交差の相同組換えを起こさせることにより、ゲノム上の標的遺伝子を削除或いは不活性化した遺伝子断片と置換することが可能である。 In order to delete or inactivate the target gene, for example, a method by homologous recombination may be used. That is, a circular recombinant plasmid obtained by cloning a DNA fragment containing a part of the target gene into an appropriate plasmid vector is incorporated into the parent microbial cell, and the parent gene is homologously recombined in a part of the target gene. It is possible to disrupt and inactivate target genes on the microbial genome. Alternatively, a target gene inactivated by base substitution or base insertion, or a linear DNA fragment containing the outer region of the target gene but not containing the target gene is constructed by a method such as PCR, and this is used as a parental microorganism. The target gene on the genome is introduced into the cell and undergoes double crossover homologous recombination at two sites outside the mutation site in the target gene of the parental microbial genome or two regions outside the target gene. Can be replaced with deleted or inactivated gene fragments.
特に、本発明微生物を構築するための親微生物として枯草菌を用いる場合、相同組換えにより標的遺伝子を削除又は不活性化する方法については、既にいくつかの報告例があり(Mol. Gen. Genet., 223, 268 (1990)等)、こうした方法を繰り返すことによって、本発明の宿主微生物を得ることができる。 In particular, when Bacillus subtilis is used as a parent microorganism for constructing the microorganism of the present invention, there have already been several reports on methods for deleting or inactivating target genes by homologous recombination (Mol. Gen. Genet , 223, 268 (1990), etc.), the host microorganism of the present invention can be obtained by repeating these methods.
また、ランダムな遺伝子の削除又は不活性化についてもランダムにクローニングしたDNA断片を用いて上述の方法と同様な相同組換えを起こさせる方法や、親微生物にγ線等を照射すること等によっても実施可能である。 In addition, for deletion or inactivation of random genes, a method of causing homologous recombination similar to the above method using a randomly cloned DNA fragment, or irradiation of parental microorganisms with γ rays, etc. It can be implemented.
以下、より具体的にSOE(splicing by overlap extension)−PCR法(Gene, 77, 61, (1989))によって調製される削除用DNA断片を用いた二重交差法による削除方法について説明するが、本発明に於ける遺伝子削除方法は下記に限定されるものではない。 Hereinafter, the deletion method by the double crossing method using the DNA fragment for deletion prepared by SOE (splicing by overlap extension) -PCR method (Gene, 77, 61, (1989)) will be described. The gene deletion method in the present invention is not limited to the following.
本方法で用いる削除用DNA断片は、削除対象遺伝子の上流に隣接する約0.5〜3kb断片と、同じく下流に隣接する約0.5〜3kb断片の間に、薬剤耐性マーカー遺伝子断片を挿入した断片である。まず、1回目のPCRによって、削除対象遺伝子の上流断片及び下流断片、並びに薬剤耐性マーカー遺伝子断片の3断片を調製するが、この際、例えば、上流断片の下流末端に薬剤耐性マーカー遺伝子の上流側10〜30塩基対配列、逆に下流断片の上流末端には薬剤耐性マーカー遺伝子の下流側10〜30塩基対配列が付加される様にデザインしたプライマーを用いる(図1)。 The DNA fragment for deletion used in this method inserts a drug resistance marker gene fragment between the approximately 0.5 to 3 kb fragment adjacent to the upstream of the gene to be deleted and the approximately 0.5 to 3 kb fragment adjacent to the downstream as well. Fragment. First, an upstream fragment and a downstream fragment of a gene to be deleted and three fragments of a drug resistance marker gene fragment are prepared by the first PCR. In this case, for example, at the upstream end of the drug resistance marker gene at the downstream end of the upstream fragment, A primer designed to add a 10-30 base pair sequence, and conversely, a downstream 10-30 base pair sequence of the drug resistance marker gene is used at the upstream end of the downstream fragment (FIG. 1).
次いで、1回目に調製した3種類のPCR断片を鋳型とし、上流断片の上流側プライマーと下流断片の下流側プライマーを用いて2回目のPCRを行うことによって、上流断片の下流末端及び下流断片の上流末端に付加した薬剤耐性マーカー遺伝子配列に於いて、薬剤耐性マーカー遺伝子断片とのアニールが生じ、PCR増幅の結果、上流側断片と下流側断片の間に、薬剤耐性マーカー遺伝子が挿入したDNA断片を得ることができる(図1)。 Next, using the three types of PCR fragments prepared in the first round as a template, and performing the second round of PCR using the upstream primer of the upstream fragment and the downstream primer of the downstream fragment, the downstream end of the upstream fragment and the downstream fragment In the drug resistance marker gene sequence added to the upstream end, annealing occurs with the drug resistance marker gene fragment, and as a result of PCR amplification, a DNA fragment in which the drug resistance marker gene is inserted between the upstream fragment and the downstream fragment Can be obtained (FIG. 1).
薬剤耐性マーカー遺伝子として、クロラムフェニコール耐性遺伝子を用いる場合、例えば表2に示したプライマーセットを用い、Pyrobest DNAポリメーラーゼ(宝酒造)などの一般のPCR用酵素キット等を用いて、成書(PCR Protocols. Current Methods and Applications, Edited by B.A.White, Humana Press, pp251 (1993)、Gene, 77, 61, (1989)等)に示される通常の条件によりSOE−PCRを行うことによって、各遺伝子の削除用DNA断片が得られる。 When using a chloramphenicol resistance gene as a drug resistance marker gene, for example, using the primer set shown in Table 2, using a general PCR enzyme kit such as Pyrobest DNA polymerase (Takara Shuzo), etc. Protocols. Current Methods and Applications, Edited by BAWhite, Humana Press, pp251 (1993), Gene, 77, 61, (1989), etc.) DNA fragments for use are obtained.
かくして得られた削除用DNA断片を、コンピテント法等によって細胞内に導入すると、同一性のある削除対象遺伝子の上流及び下流の相同領域おいて、細胞内での遺伝子組換えが生じ、目標遺伝子が薬剤耐性遺伝子と置換した細胞を薬剤耐性マーカーによる選択によって分離することができる(図1)。即ち、表2に示したプライマーセットを用いて調製した削除用DNA断片を導入した場合、クロラムフェニコールを含む寒天培地上に生育するコロニーを分離し、目的の遺伝子が削除されてクロラムフェニコール耐性遺伝子と置換していることを、ゲノムを鋳型としたPCR法などによって確認すれば良い。 When the DNA fragment for deletion thus obtained is introduced into the cell by a competent method or the like, gene recombination occurs in the cell in the homologous region upstream and downstream of the identical gene to be deleted, and the target gene Can be isolated by selection with a drug resistance marker (FIG. 1). That is, when a deletion DNA fragment prepared using the primer set shown in Table 2 was introduced, colonies growing on an agar medium containing chloramphenicol were isolated, and the target gene was deleted and chloramphenic The replacement with the call resistance gene may be confirmed by a PCR method using the genome as a template.
次に、表1に示される枯草菌の遺伝子のいずれか、又は当該遺伝子に相当する遺伝子から選ばれた1以上の遺伝子が削除又は不活性化された宿主微生物変異株に、目的とするタンパク質又はポリペプチドをコードする遺伝子を導入することによって、本発明の組換え微生物を得ることができる。 Next, a target protein or a target microorganism mutant in which one or more genes selected from the genes corresponding to Bacillus subtilis shown in Table 1 or a gene corresponding to the gene are deleted or inactivated By introducing a gene encoding a polypeptide, the recombinant microorganism of the present invention can be obtained.
目的タンパク質又はポリペプチド遺伝子は特に限定されず、洗剤、食品、繊維、飼料、化学品、医療、診断など各種産業用酵素や、生理活性ペプチドなどが含まれる。また、産業用酵素の機能別には、酸化還元酵素 (Oxidoreductase) 、転移酵素 (Transferase) 、加水分解酵素 (Hydrolase) 、脱離酵素 (Lyase)、異性化酵素 (Isomerase) 、合成酵素 (Ligase/Synthetase) 等が含まれるが、好適にはセルラーゼ、α-アミラーゼ、プロテアーゼ等の加水分解酵素の遺伝子が挙げられる。具体的には、多糖加水分解酵素の分類(Biochem. J., 280, 309 (1991))中でファミリー5に属するセルラーゼが挙げられ、中でも微生物由来、特にバチルス属細菌由来のセルラーゼが挙げられる。より具体的な例として、配列番号2又は4で示されるアミノ酸配列からなるバチルス属細菌由来のアルカリセルラーゼや、当該アミノ酸配列と70%、好ましくは80%、より好ましくは90%以上、さらに好ましくは95%以上、特に好ましくは98%以上の同一性を有するアミノ酸配列からなるセルラーゼが挙げられる。 The target protein or polypeptide gene is not particularly limited, and includes various industrial enzymes such as detergents, foods, fibers, feeds, chemicals, medicines, diagnostics, bioactive peptides, and the like. In addition, the functions of industrial enzymes are classified into oxidoreductase (Oxidoreductase), transferase (Transferase), hydrolase (Hydrolase), elimination enzyme (Lyase), isomerase (Isomerase), and synthetic enzyme (Ligase / Synthetase ) And the like, and preferred examples include genes for hydrolases such as cellulase, α-amylase, and protease. Specifically, cellulases belonging to Family 5 are listed in the classification of polysaccharide hydrolases (Biochem. J., 280, 309 (1991)), and among them, cellulases derived from microorganisms, particularly from Bacillus bacteria. As a more specific example, an alkaline cellulase derived from a Bacillus bacterium comprising the amino acid sequence represented by SEQ ID NO: 2 or 4, or 70%, preferably 80%, more preferably 90% or more, and more preferably the amino acid sequence. A cellulase comprising an amino acid sequence having an identity of 95% or more, particularly preferably 98% or more is mentioned.
また、α−アミラーゼの具体例としては、微生物由来のα−アミラーゼが挙げられ、特にバチルス属細菌由来の液化型アミラーゼが好ましい。より具体的な例として、配列番号6で示されるアミノ酸配列からなるバチルス属細菌由来のアルカリアミラーゼや、当該アミノ酸配列と70%、好ましくは80%、より好ましくは90%以上、さらに好ましくは95%以上、特に好ましくは98%以上の同一性を有するアミノ酸配列からなるアミラーゼが挙げられる。尚、アミノ酸配列の同一性はLipman-Pearson法 (Science, 227, 1435, (1985))によって計算される。また、プロテアーゼの具体例としては、微生物由来、特にバチルス属細菌由来のセリンプロテアーゼや金属プロテアーゼ等が挙げられる。 Specific examples of α-amylase include α-amylase derived from microorganisms, and liquefied amylase derived from bacteria belonging to the genus Bacillus is particularly preferable. As a more specific example, an alkaline amylase derived from a bacterium belonging to the genus Bacillus comprising the amino acid sequence represented by SEQ ID NO: 6, or 70%, preferably 80%, more preferably 90% or more, and still more preferably 95% with the amino acid sequence. As mentioned above, amylase consisting of an amino acid sequence having an identity of 98% or more is particularly preferred. The amino acid sequence identity is calculated by the Lipman-Pearson method (Science, 227, 1435, (1985)). Specific examples of proteases include serine proteases, metal proteases, and the like derived from microorganisms, particularly from Bacillus bacteria.
また、目的タンパク質又はポリペプチド遺伝子は、その上流に当該遺伝子の転写、翻訳、分泌に関わる制御領域、即ち、プロモーターおよび転写開始点を含む転写開始制御領域、リボソーム結合部位および開始コドンを含む翻訳開始領域、又、分泌用シグナルペプチド領域が適正な形で結合されていることが望ましい。例えば、特開2000-210081号公報や特開平4-190793号公報等に記載されているバチルス属細菌、すなわちKSM−S237株(FERM BP-7875)、KSM−64株(FERM BP-2886)由来のセルラーゼ遺伝子と当該セルラーゼ遺伝子の転写開始制御領域、翻訳開始領域、分泌用シグナルペプチド領域、より具体的には配列番号1で示される塩基配列の塩基番号1〜659の塩基配列、配列番号3で示される塩基配列からなるセルラーゼ遺伝子の塩基番号1〜696の塩基配列、また当該塩基配列に対して70%以上、好ましくは80%以上、より好ましくは90%以上、さらに好ましくは95%以上、特に好ましくは98%以上の同一性を有する塩基配列からなるDNA断片、あるいは上記いずれかの塩基配列の一部が欠失した塩基配列からなるDNA断片が、目的タンパク質又はポリペプチドの構造遺伝子と適正に結合されていることが望ましい。 In addition, the target protein or polypeptide gene is upstream of the control region involved in transcription, translation, and secretion of the gene, that is, the transcription initiation control region including the promoter and the transcription initiation site, the translation initiation including the ribosome binding site and the initiation codon. It is desirable that the region and the signal peptide region for secretion are bound in an appropriate form. For example, the bacterium belonging to the genus Bacillus described in JP 2000-210081, JP 4-190793, etc., that is, KSM-S237 strain (FERM BP-7875), KSM-64 strain (FERM BP-2886) Cellulase gene and transcription initiation control region, translation initiation region, secretory signal peptide region of the cellulase gene, more specifically, the nucleotide sequence of nucleotide numbers 1 to 659 of the nucleotide sequence represented by SEQ ID NO: 1, The base sequence of base numbers 1 to 696 of the cellulase gene consisting of the base sequence shown, and 70% or more, preferably 80% or more, more preferably 90% or more, still more preferably 95% or more, particularly with respect to the base sequence Preferably, a DNA fragment consisting of a base sequence having 98% or more identity or a DNA fragment consisting of a base sequence from which any of the above base sequences has been deleted is It is desirable to be properly linked to the structural protein or polypeptide structural gene.
上記の目的タンパク質又はポリペプチド遺伝子を含むDNA断片と適当なプラスミドベクターを結合させた組換えプラスミドを、一般的な形質転換法によって宿主微生物細胞に取り込ませることによって、本発明の組換え微生物を得ることができる。また、当該DNA断片に宿主微生物ゲノムとの適当な相同領域を結合したDNA断片を用い、宿主微生物ゲノムに直接組み込むことによっても本発明の組換え微生物を得ることができる。 The recombinant microorganism of the present invention is obtained by incorporating a recombinant plasmid in which a DNA fragment containing the above target protein or polypeptide gene and an appropriate plasmid vector are combined into a host microorganism cell by a general transformation method. be able to. 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.
本発明の組換え微生物を用いた目的タンパク質又はポリペプチドの生産は、当該菌株を同化性の炭素源、窒素源、その他の必須成分を含む培地に接種し、通常の微生物培養法にて培養し、培養終了後、タンパク質又はポリペプチドを採取・精製することにより行えばよい。 In producing the target protein or polypeptide using the recombinant microorganism of the present invention, the strain is inoculated into a medium containing an assimilable carbon source, nitrogen source, and other essential components, and cultured by a normal microorganism culture method. After completion of the culture, the protein or polypeptide may be collected and purified.
以上より、表1に示される枯草菌の遺伝子のいずれか、又は当該遺伝子に相当する遺伝子から選ばれた1以上の遺伝子が削除又は不活性化された宿主微生物変異株、及び当該変異株を用いて組換え微生物を構築することができ、これを用いれば有用なタンパク質又はポリペプチドを効率的に生産することができる。 As described above, any one of the Bacillus subtilis genes shown in Table 1 or one or more genes selected from the genes corresponding to the genes are deleted or inactivated, and the mutant strains are used. Thus, a recombinant microorganism can be constructed, and by using this, a useful protein or polypeptide can be efficiently produced.
以下に、枯草菌のccpA遺伝子(BG10376)を削除した組換え枯草菌株構築の実施例を中心に、当該発明の組換え微生物の構築方法と、当該組換え微生物を用いたセルラーゼ及びα―アミラーゼの生産方法について具体的に説明する。 In the following, focusing on the examples of the construction of recombinant Bacillus subtilis strains from which the ccpA gene (BG10376) of Bacillus subtilis has been deleted, the method for constructing the recombinant microorganism of the present invention, cellulase and α-amylase using the recombinant microorganism The production method will be specifically described.
実施例1
枯草菌168株から抽出したゲノムDNAを鋳型とし、表2に示したccpA-AFとccpA-A/CmR、及びccpA-B/CmFとccpA-BRの各プライマーセットを用いて、ゲノム上のccpA遺伝子の上流に隣接する0.6kb断片(A)、及び下流に隣接する0.6kb断片(B)をそれぞれ調製した。一方、プラスミドpC194(J. Bacteriol. 150 (2), 815 (1982))のクロラムフェニコール耐性遺伝子をプラスミドpUC18のXbaI−BamHI切断点に挿入した組換えプラスミドpCBB31を鋳型とし、表2に示したCmFとCmRプライマーセットを用いて、クロラムフェニコール耐性遺伝子を含む1kb断片(C)を調製した。次に、得られた(A)(B)(C)3断片を混合して鋳型とし、表2のプライマーccpA-AFとccpA-BRを用いたSOE−PCRを行うことによって、3断片を(A)(C)(B)の順になる様に結合させ、2.2kbのDNA断片を得た(図1参照)。このDNA断片を用いてコンピテント法により枯草菌168株の形質転換を行い、クロラムフェニコールを含むLB寒天培地上に生育したコロニーを形質転換体として分離した。得られた形質転換体のゲノムを抽出し、PCRによってccpA遺伝子が削除され、クロラムフェニコール耐性遺伝子に置換していることを確認した。
Example 1
Using genomic DNA extracted from Bacillus subtilis strain 168 as a template, and using the ccpA-AF and ccpA-A / CmR and ccpA-B / CmF and ccpA-BR primer sets shown in Table 2, ccpA on the genome A 0.6 kb fragment adjacent to the upstream of the gene (A) and a 0.6 kb fragment adjacent to the downstream (B) were prepared, respectively. On the other hand, Table 2 shows a recombinant plasmid pCBB31 in which the chloramphenicol resistance gene of plasmid pC194 (J. Bacteriol. 150 (2), 815 (1982)) was inserted into the plasmid pUC18 at the XbaI-BamHI breakpoint. Using the CmF and CmR primer sets, a 1 kb fragment (C) containing a chloramphenicol resistance gene was prepared. Next, the 3 fragments obtained (A), (B), and (C) were mixed to form a template, and SOE-PCR using the primers ccpA-AF and ccpA-BR in Table 2 was performed to obtain 3 fragments ( A) (C) and (B) were combined in this order to obtain a 2.2 kb DNA fragment (see FIG. 1). Using this DNA fragment, Bacillus subtilis 168 strain was transformed by a competent method, and colonies grown on LB agar medium containing chloramphenicol were isolated as transformants. The genome of the obtained transformant was extracted, and it was confirmed that the ccpA gene was deleted by PCR and replaced with a chloramphenicol resistance gene.
実施例2
一方、実施例1と同様に、表2に示した各遺伝子-AF、各遺伝子-A/CmR、各遺伝子-B/CmF、各遺伝子-BR、CmF、CmRのプライマーセットにより調製した削除用DNA断片を用いて、ゲノム上のcomA、yopO、treR、yvbA、yvaN、yttP、yurK、yozA、licR、sigL、mntR、glcT、ykvE、slr、rocR、yyaA、及びrsiX、遺伝子が削除され、クロラムフェニコール耐性
遺伝子に置換した胞子形成遺伝子削除株をそれぞれ分離した。
Example 2
On the other hand, in the same manner as in Example 1, deletion DNAs prepared using the primer sets of each gene-AF, each gene-A / CmR, each gene-B / CmF, each gene-BR, CmF, and CmR shown in Table 2 Using fragments, comA , yopO , treR , yvbA , yvaN , yttP , yurK , yozA , licR , sigL , mntR , glcT , ykvE , slr , rocR , yyaA , and rsiX , the gene are deleted Each sporulation gene deletion strain substituted with a phenicol resistance gene was isolated.
実施例3
また、表2に示した各遺伝子-AF、各遺伝子-A/Cm2R、各遺伝子-B/Cm2F、各遺伝子-BR、Cm2F、Cm2Rのプライマーセットにより、実施例2と同様に調製した削除用DNA断片を用いて、ゲノム上のcspB、yvdE、yaaT、yycH、及びylbO、各遺伝子が削除され、クロラムフェニコール耐性遺伝子に置換した胞子形成遺伝子削除株をそれぞれ分離した。
Example 3
In addition, DNA for deletion prepared in the same manner as in Example 2 with the primer sets of each gene-AF, each gene-A / Cm2R, each gene-B / Cm2F, each gene-BR, Cm2F, and Cm2R shown in Table 2 Using the fragments, cspB , yvdE , yaaT , yycH , and ylbO genes on the genome were deleted, and sporulation gene deletion strains in which the chloramphenicol resistance gene was replaced were isolated.
実施例4
更に、表2に示した各遺伝子-AF、各遺伝子-A/Cm4R、各遺伝子-B/Cm4F、各遺伝子-BR、各遺伝子-A/Cm4F、各遺伝子-B/Cm4Rのプライマーセットにより、実施例2と同様に調製した削除用DNA断片を用いて、ゲノム上のyacP、hprK、及びyhdK、各遺伝子が削除され、クロラムフェニコール耐性遺伝子に置換した胞子形成遺伝子削除株をそれぞれ分離した。
Example 4
Furthermore, each gene-AF, each gene-A / Cm4R, each gene-B / Cm4F, each gene-BR, each gene-A / Cm4F, each gene-B / Cm4R shown in Table 2 were used. Using the deletion DNA fragment prepared in the same manner as in Example 2, the sporulation gene deleted strains in which each gene was deleted and replaced with the chloramphenicol resistance gene were isolated from each other in the genomes of yacP , hprK , and yhdK .
実施例5
実施例1〜4にて得られた各遺伝子削除株、及び対照として枯草菌168株に、バチルス エスピー(Bacillus sp.)KSM−S237株由来のアルカリセルラーゼ遺伝子(特開2000-210081号公報)をコードするDNA断片(3.1kb)がシャトルベ
クターpHY300PLKのBamHI制限酵素切断点に挿入された組換えプラスミドpHY−S237を、プロトプラスト形質転換法によって導入した。これによって得られた菌株を5mLのLB培地で一夜30℃で振盪培養を行い、更にこの培養液0.03mLを30mLの2×L−マルトース培地(2%トリプトン、1%酵母エキス、1%NaCl、7.5%マルトース、7.5ppm硫酸マンガン4−5水和物、15ppmテトラサイクリン)に接種し、30℃で3日間、振盪培養を行った。培養後、遠心分離によって菌体を除いた培養液上清のアルカリセルラーゼ活性を測定し、培養によって菌体外に分泌生産されたアルカリセルラーゼの量を求めた。この結果、表3に示した様に、宿主として各遺伝子削除株を用いた場合、対照の168株(野生型)の場合と比較して高いアルカリセルラーゼの分泌生産が認められた。
Example 5
To each of the gene-deleted strains obtained in Examples 1 to 4 and Bacillus subtilis 168 strain as a control, an alkaline cellulase gene derived from Bacillus sp. KSM-S237 strain (Japanese Patent Laid-Open No. 2000-210081) was added. A recombinant plasmid pHY-S237 in which the encoding DNA fragment (3.1 kb) was inserted into the BamHI restriction enzyme cleavage point of the shuttle vector pHY300PLK was introduced by the protoplast transformation method. The resulting strain was shaken and cultured in 5 mL of LB medium at 30 ° C. overnight, and 0.03 mL of this culture was added to 30 mL of 2 × L-maltose medium (2% tryptone, 1% yeast extract, 1% NaCl. 7.5% maltose, 7.5 ppm manganese sulfate 4-5 hydrate, 15 ppm tetracycline), followed by shaking culture at 30 ° C. for 3 days. After the cultivation, the alkaline cellulase activity of the culture supernatant after removing the cells by centrifugation was measured, and the amount of the alkaline cellulase secreted and produced outside the cells by the cultivation was determined. As a result, as shown in Table 3, when each gene-deleted strain was used as a host, a higher secretory production of alkaline cellulase was observed as compared with the control 168 strain (wild type).
実施例6
実施例1〜4にて得られた各遺伝子削除株、及び対照として枯草菌168株に、バチルス エスピー(Bacillus sp.)KSM−K38株由来のアルカリアミラーゼ遺伝子(特開2000−184882号公報、Eur. J. Biochem., 268, 2974 (2001))の成熟酵素領域(Asp1−Gln480)をコードするDNA断片(1.5kb)の上流に配列番号3に示されるアルカリセルラーゼ遺伝子のプロモーター領域とシグナル配列領域の一部を含む上流側0.6kb断片を結合して成る2.1kb断片(配列番号5)をシャトルベクターpHY300PLKのBglII−XbaI制限酵素切断部位に挿入された組換えプラスミドpHSP−K38を、プロトプラスト形質転換法によって導入した。これによって得られた菌株を5mLのLB培地で一夜30℃で振盪培養を行い、更にこの培養液0.6mLを30mLの2×L−マルトース培地(2%トリプトン、1%酵母エキス、1%NaCl、7.5%マルトース、7.5ppm硫酸マンガン4−5水和物、15ppmテトラサイクリン)に接種し、30℃で3〜6日間、振盪培養を行った。培養後、遠心分離によって菌体を除いた培養液上清のアルカリアミラーゼ活性を測定し、培養によって菌体外に分泌生産されたアルカリアミラーゼの量を求めた。この結果、表4に示した様に、各遺伝子削除株を宿主として用いた場合、対照の168株(野生型)の場合と比較して高いアルカリアミラーゼの分泌生産が認められた。
Example 6
For each gene-deleted strain obtained in Examples 1 to 4 and Bacillus subtilis 168 strain as a control, alkaline amylase gene derived from Bacillus sp. KSM-K38 strain (JP 2000-184882 A, Eur J. Biochem., 268, 2974 (2001)), the promoter region and signal sequence of the alkaline cellulase gene shown in SEQ ID NO: 3 upstream of the DNA fragment (1.5 kb) encoding the mature enzyme region (Asp1-Gln480). Recombinant plasmid pHSP-K38 in which a 2.1 kb fragment (SEQ ID NO: 5) obtained by ligating an upstream 0.6 kb fragment containing a part of the region was inserted into the BglII-XbaI restriction enzyme cleavage site of shuttle vector pHY300PLK, It was introduced by the protoplast transformation method. The resulting strain was shaken and cultured in 5 mL of LB medium at 30 ° C. overnight, and 0.6 mL of this culture was further added to 30 mL of 2 × L-maltose medium (2% tryptone, 1% yeast extract, 1% NaCl. 7.5% maltose, 7.5 ppm manganese sulfate 4-5 hydrate, 15 ppm tetracycline), followed by shaking culture at 30 ° C. for 3 to 6 days. After culturing, the alkaline amylase activity of the culture supernatant after removing the cells by centrifugation was measured, and the amount of alkaline amylase secreted and produced outside the cells by the culture was determined. As a result, as shown in Table 4, when each gene-deleted strain was used as a host, higher secretion of alkaline amylase was observed compared to the control 168 strain (wild type).
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