JP5010470B2 - 1,4−ブタンジアミンの生化学合成 - Google Patents
1,4−ブタンジアミンの生化学合成 Download PDFInfo
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- JP5010470B2 JP5010470B2 JP2007520745A JP2007520745A JP5010470B2 JP 5010470 B2 JP5010470 B2 JP 5010470B2 JP 2007520745 A JP2007520745 A JP 2007520745A JP 2007520745 A JP2007520745 A JP 2007520745A JP 5010470 B2 JP5010470 B2 JP 5010470B2
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- gene
- increased
- ornithine decarboxylase
- activity
- decarboxylase
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- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006696 biosynthetic metabolic pathway Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
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- 239000003925 fat Substances 0.000 description 1
- -1 for example Chemical class 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000012239 gene modification Methods 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 238000010353 genetic engineering Methods 0.000 description 1
- 230000005017 genetic modification Effects 0.000 description 1
- 235000013617 genetically modified food Nutrition 0.000 description 1
- 229930195712 glutamate Natural products 0.000 description 1
- 239000003966 growth inhibitor Substances 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 238000006912 hydrolase reaction Methods 0.000 description 1
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- 230000005764 inhibitory process Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000037041 intracellular level Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical group CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- NGVDGCNFYWLIFO-UHFFFAOYSA-N pyridoxal 5'-phosphate Chemical compound CC1=NC=C(COP(O)(O)=O)C(C=O)=C1O NGVDGCNFYWLIFO-UHFFFAOYSA-N 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000003757 reverse transcription PCR Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000002741 site-directed mutagenesis Methods 0.000 description 1
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- 239000011734 sodium Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 229940063675 spermine Drugs 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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Description
(i)アルギニンデカルボキシラーゼをコードする遺伝子speA(E.C.4.1.1.19に属する)およびアグマチナーゼをコードする遺伝子speB(E.C.3.5.3.11に属する;アグマチンウレアヒドロラーゼをコードする遺伝子とも称される);または
(ii)アルギニンデカルボキシラーゼをコードする遺伝子speA(E.C.4.1.1.19に属する)、およびアグマチンイミノヒドロラーゼをコードする遺伝子aguA(E.C.3.5.3.12に属する;アグマチンデイミナーゼをコードする遺伝子とも称される)、およびN−カルバモイルプトレシンアミドヒドロラーゼをコードする遺伝子aguB(E.C.3.5.1.53に属する)、および場合によりまた、アグマチナーゼをコードする遺伝子speB(E.C.3.5.3.11に属する)。
一般的手順
すべてのDNA操作については、標準的な手順を適用した(サンブルック,J(Sambrook,J.)ら(1989年)、Molecular cloning:a laboratory manual、第2版、Cold Spring Harbor Laboratory Press,Cold Spring Harbor、ニューヨーク)。DNAは、他に示さない場合、大腸菌(E.coli)LJ110(ゼッペンフィールド(Zeppenfeld)ら(2000年)、J Bacteriol.182,4443−4452)の染色体DNAから増幅した。PCR増幅は、製造のプロトコルに従い、プルーフリーディング酵素SAWADY Pwo−DNA−ポリメラーゼ(Peqlab Biotechnologie GmbH,Erlangen、独国)またはPlatinum Pfx DNAポリメラーゼ(Invitrogen,Karlsruhe、独国)を使用して実施する一方、構築された株の確認は、TaqポリメラーゼREADYMIX(Sigma,Taufkirchen、独国)を利用するコロニーPCRによって行った。その後のクローニングならびにさらなる操作のための制限部位は、MWG−Biotech(Ebersberg、独国)から購入したオリゴヌクレオチドにより導入した。DNAフラグメントは、製造のプロトコルに従い、MinElute Gel Extraction Kit(Qiagen,Hilden、独国)で精製した。プラスミドDNAの調製は、QIAprepスピンMiniprep Kit(Qiagen,Hilden、独国)の利用によって達成した。構築されたプラスミドの確認は、制限解析および以後の配列決定(Agowa,Berlin、独国)によって行った。
(i)プラスミドpDAB3(pJF119EH−speCnRBS)の構築
大腸菌(E.coli)LJ110(ゼッペンフィールド(Zeppenfeld)ら、一般的手順を参照のこと)の(構成性、生合成性の)オルニチンデカルボキシラーゼをコードする遺伝子speCを発現ベクターpJF119EH(フェルステ,J.P.(Fuerste,J.P.)ら(1986年)、Gene48,119−131)にクローニングし、イソプロピル−β−D−チオガラクトピラノシド(IPTG)誘導性tac促進剤およびlacリプレッサー系(lacIQ)下の転写制御に基づく強力な遺伝子発現を可能にした。従って、コーディング遺伝子speCを、本来のRBS、開始および終止コドンと共にクローニングした。
5’−GAG CTC TAG ACC AGT TTG ACC CAT ATC T−3’ [配列番号1]
(変異は太字、XbaI制限部位は斜字体)
および
5’−TTT TGC ATG CTT ACT TCA ACA CAT AAC CGT AC−3’ [配列番号2]
(変異は太字、SphI制限部位は斜字体)
大腸菌(E.coli)LJ110(ゼッペンフィールド(Zeppenfeld)ら、一般的手順を参照のこと)の(構成性、生合成性の)オルニチンデカルボキシラーゼをコードする遺伝子speCを発現ベクターpJF119EH(フェルステ,J.P.(Fuerste,J.P.)ら(1986年)、Gene48,119−131)にクローニングし、イソプロピル−β−D−チオガラクトピラノシド(IPTG)誘導性tac促進剤およびlacリプレッサー系(lacIQ)下の転写制御に基づく強力な遺伝子発現を可能にした。従って、コーディング遺伝子speCを、本来の開始および終止コドンと共にクローニングした。インシリコ研究を利用してspeCに対する保存されたリボソーム結合部位(RBS)を決定することができなかったため、部位特異的変異誘発により、speC開始コドンの7bp上流に局在するRBSを大腸菌(E.coli)のコンセンサス配列に適応した。
5’−GAG CTC TAG ACC AGT TTG AGG AAT ATC T−3’[配列番号3]
(変異は太字、XbaI制限部位は斜字体)
および
5’−TTT TGC ATG CTT ACT TCA ACA CAT AAC CGT AC−3’ [配列番号2]
(変異は太字、SphI制限部位は斜字体)
大腸菌(E.coli)LJ110(ゼッペンフィールド(Zeppenfeld)ら、一般的手順を参照のこと)の(誘導性、生分解性の)オルニチンデカルボキシラーゼをコードする遺伝子speFを、発現ベクターpJF119EH(フェルステ,J.P.(Fuerste,J.P.)ら(1986年)、Gene48,119−131)にクローニングした。このベクターは、イソプロピル−β−D−チオガラクトピラノシド(IPTG)誘導性tac促進剤およびlacリプレッサー系(laclQ)下で、クローニングされた遺伝子の転写制御に基づく高レベルタンパク質産生を可能にする。発現プラスミドpDAB2(pJF119EH−speF)の構築のために、コーディング遺伝子speFを、本来のRBS(リボソーム結合部位)、開始および終止コドンと共にクローニングした。
5’−GAC CTG CTG GTA CCT AAA ATA AAG AGA TGA AA−3’ [配列番号4]
(変異は太字、KpnI制限部位は斜字体)
および
5’−TCG ATC TAG ACT GAC TCA TAA TTT TTC CCC−3’ [配列番号5]
(変異は太字、XbaI制限部位は斜字体)。
大腸菌(E.coli)LJ110(ゼッペンフィールド(Zeppenfeld)ら、一般的手順を参照のこと)の、アルギニンデカルボキシラーゼをコードする遺伝子speAならびにアグマチナーゼをコードするspeBを発現ベクターpJF119EH(フェルステ,J.P.(Fuerste,J.P.)ら(1986年)、Gene48,119−131)にクローニングし、イソプロピル−β−D−チオガラクトピラノシド(IPTG)誘導性tac促進剤およびlacリプレッサー系(lacIQ)下のクローニングされた遺伝子の転写制御に基づく高レベルタンパク質産生を可能にした。このように、遺伝子の本来のオペロン構造ならびにRBS、開始および終止コドンを維持した。
5’−ACA CTT TCT AGA ATA ATT TGA GGT TCG CTA TG−3’ [配列番号6]
(変異は太字、XbaI制限部位は斜字体)
および
5’−CAT GGC ATG CGG TGC TTA CTC G−3’ [配列番号7]
(変異は太字、SphI制限部位は斜字体)
オルニチンデカルボキシラーゼSpeF、アルギニンデカルボキシラーゼSpeAおよびアグマチナーゼSpeBの同時産生を可能にするために、大腸菌(E.coli)LJ110(ゼッペンフィールド(Zeppenfeld)ら、一般的手順を参照のこと)のspeAB遺伝子を、speF発現ベクターpDAB2(iiiを参照のこと))にクローニングした。
実施例1.1 オルニチンデカルボキシラーゼの過剰産生を介する1,4−ブタンジアミンの産生(フラスコ振盪法)
(増加した翻訳および/または転写効率での)オルニチンデカルボキシラーゼをコードする遺伝子speFまたはspeCの過剰発現のDAB産生に対する影響について、プラスミドpDAB2((iii)を参照のこと)、またはpDAB3((i)を参照のこと)、またはpDAB4((ii)を参照のこと)を担持する大腸菌(E.coli)宿主株LJ110(ゼッペンフィールド(Zeppenfeld)ら、一般的手順を参照のこと)内において調べた。
流加培養条件下での発酵DAB産生の能力を、labforsバイオリアクター(Infors,Einsbach、独国)内での高レベルDAB産生者株LJ110pDAB2の利用により調べた。DABを産生する株は、その増殖に対しアミノ酸依存的ではないため、細胞増殖を制限するために、リン酸制限培養のために開発されたプロトコルを適用した。従って、MgSO4・7H2O(3g/l)、CaCl2・2H2O(15mg/l)、KH2PO4(400mg/l)、NaCl(1g/l)、(NH4)2SO4(5g/l)ならびに微量元素Al2(SO4)3・18H2O(3mg/l)、CoCl2・6H2O(1.05mg/l)、CuSO4・5H2O(3.75mg/l)、H3BO3(0.75mg/l)、MnCl2・4H2O(30mg/l)、Na2MoO4・2H2O(4.5mg/l)、NiSO4・6H2O(3mg/l)およびZnSO4・7H2O(22.5mg/l)からなるリン酸制限最小培地を使用した。オートクレーブ後、クエン酸Na・3H2O(1.5g/l)、FeSO4・7H2O(112.5mg/l)、チアミン・HCl(ビタミンB1)(7.5mg/l)、アンピシリン(ampicilline)(100mg/l)およびグルコース(10g/l)を滅菌条件下でバイオリアクターに添加した。
オルニチンならびにアルギニンから出発するDAB形成のさらなる改善を実証するために、オルニチンデカルボキシラーゼSpeF(増加した転写効率を伴う)、アルギニンデカルボキシラーゼSpeAおよびアグマチナーゼSpeBの組み合わされた過剰産生の影響について調べた。
Claims (10)
- 生来のレベルのオルニチンデカルボキシラーゼ活性と比較して増加したレベルのオルニチンデカルボキシラーゼ活性(増加したODC活性)を有する微生物における1,4−ブタンジアミンの生化学合成のための方法であって、
増加したオルニチンデカルボキシラーゼ活性は、増加した翻訳および/または転写効率によるオルニチンデカルボキシラーゼをコードする遺伝子の過剰発現によって得られ、そして微生物において産生される1,4−ブタンジアミンは、オルニチンが添加されていない発酵ブロスに分泌され、発酵ブロスから回収され、
前記増加した翻訳および/または転写効率は、イソプロピル−β−D−チオガラクトシド(IPTG)誘導性の強力なプロモーターからなる強力な調節プロモーターの使用によって得られることを特徴とする、方法。 - 増加した翻訳および/または転写効率は、T7、T5、ptac、およびplacプロモーターからなる群から選択されるプロモーターの使用によって得られる、請求項1に記載の方法。
- オルニチンデカルボキシラーゼをコードする遺伝子は、リボソームによるRNA−テンプレートの良好な認識を達成するためにRBSが適用される前記遺伝子のコーディング領域の上流に局在するリボソーム結合部位(RBS)を有する、請求項1または2に記載の方法。
- 過剰発現されるオルニチンデカルボキシラーゼをコードする遺伝子はオルニチンデカルボキシラーゼspeFまたはspeC遺伝子(それぞれE.C.4.1.1.17に属する)である、請求項1〜3のいずれか一項に記載の方法。
- 過剰発現されるオルニチンデカルボキシラーゼをコードする遺伝子はオルニチンデカルボキシラーゼspeF遺伝子である、請求項4に記載の方法。
- 過剰発現されるオルニチンデカルボキシラーゼをコードする遺伝子は、エシェリキア(Escherichia)、赤痢菌(Shigella)、サルモネラ(Salmonella)、エルシニア(Yersinia)、およびシェワネラ(Shewanella)からなる群から選択される属のうちの1つから由来するオルニチンデカルボキシラーゼ遺伝子speFまたはspeCである、請求項4または5のいずれか一項に記載の方法。
- 過剰発現されるオルニチンデカルボキシラーゼをコードする遺伝子は、大腸菌(Escherichia coli)、B群赤痢菌(Shigella flexneri)、サルモネラ・チフィムチウム(Salmonella typhimutium)、ペスト菌(Yersinia pestis)、およびシェワネラ・オネイデンシス(Shewanella oneidensis)からなる群から選択される種のうちの1つから由来するオルニチンデカルボキシラーゼ遺伝子である、請求項6に記載の方法。
- さらに、増加したODC活性のために、
アルギニンデカルボキシラーゼをコードする遺伝子speA(E.C.4.1.1.19に属する)およびアグマチナーゼをコードする遺伝子speB(E.C.3.5.3.11に属する、アグマチンウレアヒドロラーゼをコードする遺伝子とも称される)、または
アルギニンデカルボキシラーゼをコードする遺伝子speA(E.C.4.1.1.19に属する)、アグマチンイミノヒドロラーゼをコードする遺伝子aguA(E.C.3.5.3.12に属する、アグマチンデイミナーゼをコードする遺伝子とも称される)、N−カルバモイルプトレシンアミドヒドロラーゼをコードする遺伝子aguB(E.C.3.5.1.53に属する)、および、アグマチナーゼをコードする遺伝子speB(E.C.3.5.3.11に属する)
のいずれかの過剰発現によって、少なくとも2つの他の酵素についても増加した酵素活性が得られる、請求項1〜7のいずれか一項に記載の方法。 - 方法は、サッカロミセス(Saccharomyces)sp.、バチルス(Bacillus)sp.、コリネバクテリウム(Corynebacterium)sp.、エシェリキア(Escherichia)sp.およびピキア(Pichia)sp.からなる群から選択される宿主生物体において行われる、請求項1〜8のいずれか一項に記載の方法。
- 方法は、サッカロミセス・セレビシエ(Saccharomyces cerevisiae)、コリネバクテリウム(Corynebacterium)sp.およびエシェリキア(Escherichia)sp.からなる群から選択される宿主生物体において行われ、オルニチンデカルボキシラーゼの増加したレベルの活性とは別に、少なくともアグマチナーゼならびに/またはアグマチンイミノヒドロラーゼおよびN−カルバモイルプトレシンアミドヒドロラーゼと組み合わされたアルギニンデカルボキシラーゼの活性のレベルも増加する、請求項1〜9のいずれか一項に記載の方法。
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