JP2019531752A - フコシル化オリゴ糖の製造のための改良された方法 - Google Patents
フコシル化オリゴ糖の製造のための改良された方法 Download PDFInfo
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Abstract
Description
この目的及び他の目的は、遺伝子改変原核宿主細胞を使用してフコシル化オリゴ糖を製造するための方法であって、
・少なくとも、(i)改変されていない宿主細胞において通常レベルを有するフルクトース−6−リン酸変換酵素の活性が低下又は消失される;(ii)GDPフコースのデノボ合成に必要な酵素をコードする少なくとも1つの遺伝子が宿主細胞において過剰発現される;(iii)フコシルトランスフェラーゼ、好ましくは、アルファ−1,2−フコシルトランスフェラーゼ及び/又はアルファ−1,3−フコシルトランスフェラーゼをコードする外因性遺伝子が、宿主細胞内で発現される、好ましくは、過剰発現されるように、遺伝子改変された宿主細胞を準備するステップ、
・グルコース、スクロース、グリセロール、スクシネート、シトレート、ピルベート、マレート、ラクテート又はエタノールのうちの少なくとも1つから選択される炭素及びエネルギー供給源を含有する培養培地中で、前記遺伝子改変宿主細胞を培養するステップ、並びに
・ラクトースを有する培養培地にラクトースを提供するステップ
を含む方法によって解決される。
・少なくとも、(i)改変されていない宿主細胞において通常レベルを有するフルクトース−6−リン酸変換酵素の活性を低下若しくは消失させることによって、又はフルクトース−6−リン酸生成酵素の活性を増加させることによって、前記遺伝子改変宿主細胞におけるフルクトース−6−リン酸のプールが増加する;(ii)GDPフコースのデノボ合成に必要な酵素をコードする少なくとも1つの遺伝子が、宿主細胞において過剰発現される;(iii)アルファ−1,2−フコシルトランスフェラーゼ及び/又はアルファ−1,3−フコシルトランスフェラーゼをコードする外因性遺伝子が、宿主細胞内で発現されるように、遺伝子改変された原核宿主細胞を準備するステップ、
・グルコース、スクロース、グリセロール、スクシネート、シトレート、ピルベート、マレート、ラクテート又はエタノールのうちの少なくとも1つから選択される炭素及びエネルギー供給源を含有する培養培地中で、前記遺伝子改変宿主細胞を培養するステップ;並びに
・ラクトースを有する培養培地にラクトースを提供するステップ
を含む方法が本明細書で提供される。
アクセプター分子は、例えば、ラクトース、2’−フコシルラクトース、3−フコシルラクトース、3’−シアリルラクトース、6’−シアリルラクトース、ラクト−N−テトラオース、ラクト−N−ネオテトラオース又はこれらの誘導体であり得る。
2’−フコシルラクトースの製造のための大腸菌BL21(DE3)株の工学的操作
エルシニア・ベルコビエリATCC 43970の糖流出トランスポーターによる2’−フコシルラクトース排出の増強の検証
エルシニア・ベルコビエリATCC 43970由来の異種の糖トランスポーターの機能性を実証するために、遺伝子yberc0001_9420を、遺伝子yberc0001_9420に挿入されたプラスミドpBBR−MCS5(Kovach,Elzerら 1995年、「Four new derivatives of the broad−host−range cloning vector pBBR1MCS,carrying different antibiotic−resistance cassettes」、Gene 166、175〜176頁)由来のゲンタマイシン抵抗性カセットaacC1を使用して、manB、manC、gmd、wcaG、lacY、wbgLの染色体組込みを含有した、大腸菌BL21(DE3)株のlacZ−、araA−、fucl−、fucK−、wcaJ−;並びにDatsenko及びWanner(2000年;上記を参照のこと。)に従った相同組換えによるyberc0001_9420から欠失させて、株Δyberc0001_9420を得た。
発酵プロセスにおける2’−フコシルラクトースの生成
培養上清のHPLC分析
代謝の工学的操作による2’−フコシルラクトース生成株の改良
大腸菌株による2’−フコシルラクトースの合成に関するさらなる改良を、ホスホフルクトキナーゼをコードするpfkA遺伝子の欠失によって達成した。グリセロールのような糖新生基質において大腸菌を培養する場合、PfkAによるフルクトース−6−リン酸のリン酸化は、ATP消費量の多いトレッドミル反応であり、さらに、基質に対して、ManAと競合する。pfkA遺伝子は、lox71/66部位によって隣接したゲンタマイシン抵抗性カセット(aacC1)を使用して、Datsenko及びWanner(2000年、上記を参照のこと。)に従った相同組換えによって欠失した(Lambert,Bongersら 2007年「Cre−lox−based system for multiple gene deletions and selectable−marker removal in Lactobacillus plantarum」、Appl.Environ.Microbial.73、1126〜113頁を参照のこと。)。pfkA遺伝子の欠失が成功した後、抗生物質抵抗性遺伝子を、pKD46(Datsenko及びWanner、2000年を参照のこと。)シャーシにおけるParaプロモーターの制御下でクローニングされたCreリコンビナーゼを使用して大腸菌のゲノムから除去した(Abremski,Hoessら 1983年、「Studies on the properties of P1 site−specific recombination: evidence for topologically unlinked products following recombination」、Cell 32、1301〜1311頁を参照のこと。)。
2’−フコシルラクトースの生成のために最適化された発酵プロセス
代謝チャレンジにより増強された2’−フコシルラクトース生成株の工学的操作
発酵プロセスによる150g/Lの2’−フコシルラクトースの生成
グリセロールからの3−フコシルラクトースの生成
Claims (25)
- 遺伝子改変原核宿主細胞を使用してフコシル化オリゴ糖を製造するための方法であって、
・少なくとも、(i)改変されていない宿主細胞において通常レベルを有するフルクトース−6−リン酸変換酵素の活性が、低下又は消失される;(ii)GDPフコースのデノボ合成に必要な酵素をコードする少なくとも1つの遺伝子が、宿主細胞において過剰発現される;(iii)アルファ−1,2−フコシルトランスフェラーゼ及び/又はアルファ−1,3−フコシルトランスフェラーゼをコードする外因性遺伝子が、宿主細胞内で発現される、ように遺伝子改変された原核宿主細胞を準備するステップと、
・グリセロール、スクシネート、マレート、ピルベート、ラクテート、エタノール、シトレートのうちの少なくとも1つから選択される炭素供給源及び/又はエネルギー供給源から、培養培地中で、前記遺伝子改変宿主細胞を培養する及び/又は増殖させるステップと
・前記培養培地にラクトースを提供するステップと
を含み、
それによって、前記宿主細胞が培養される培地から得ることができるフコシル化オリゴ糖を製造する、方法。 - フコシル化オリゴ糖が、2’−フコシルラクトース、3−フコシルラクトース又はジフコシルラクトースからなる群から選択される、請求項1に記載の方法。
- 宿主細胞が、細菌宿主細胞からなる群から選択され、好ましくは、大腸菌株、ラクトバチルス(Lactobacillus)属種又はコリネバクテリウム・グルタミクム(Corynebacterium glutamicum)株から選択される、請求項1又は2に記載の方法。
- ホスホフルクトキナーゼ、グルコース−6−リン酸イソメラーゼ、フルクトース−6−リン酸アルドラーゼ、トランスケトラーゼ若しくはトランスアルドラーゼの群から選択されるフルクトース−6−リン酸変換酵素の活性を低下若しくは消失させることによって、及び/又はフルクトース−1,6−ビスリン酸ホスファターゼの活性を増加させることによって、細胞内のフルクトース−6−リン酸プールが増加する、請求項1〜3のいずれかに記載の方法。
- GDPフコースのデノボ合成に必要な酵素をコードする遺伝子が、ホスホマンノムターゼをコードする遺伝子、好ましくはmanB、マンノース−1−リン酸グアノシルトランスフェラーゼをコードする遺伝子、好ましくはmanC、GDP−マンノース−4,6−デヒドラターゼをコードする遺伝子、好ましくはgmd、及びGDP−L−フコースシンターゼをコードする遺伝子、好ましくはwcaGである、請求項1〜4のいずれかに記載の方法。
- 少なくとも1つのフコシルトランスフェラーゼをコードする遺伝子が、アルファ−1,2−フコシルトランスフェラーゼ及び/又はアルファ−1,3−フコシルトランスフェラーゼ活性を示す、請求項1〜5のいずれかに記載の方法。
- アルファ−1,2−フコシルトランスフェラーゼをコードする遺伝子が、大腸菌O126由来のwbgL又はヘリコバクター・ピロリ(Helicobacter pylori)由来のfucT2からなる群から選択される、請求項6に記載の方法。
- アルファ−1,3−フコシルトランスフェラーゼをコードする遺伝子が、アッカーマンシア・ムシニフィラ(Akkermansia muciniphila)、バクテロイデス・フラジリス(Bacteroides fragilis)、ヘリコバクター・ピロリ又はヘリコバクター・ヘパティカス(Helicobacter hepaticus)の各種のアルファ−1,3−フコシルトランスフェラーゼ遺伝子からなる群から選択される、請求項6に記載の方法。
- 宿主細胞が、所望のフコシル化オリゴ糖の培養培地への排出を可能にする又は促進するタンパク質をコードする遺伝子を発現するように、さらに遺伝子改変されている、請求項1〜8のいずれかに記載の方法。
- ラクトースの移入のための内因性又は外因性パーミアーゼが、過剰発現される、請求項1〜9のいずれかに記載の方法。
- 宿主細胞において改変されている又は宿主細胞を改変する遺伝子が、内因性又は外因性遺伝子である、請求項1〜10のいずれかに記載の方法。
- 宿主細胞において改変されている又は宿主細胞を改変する遺伝子の少なくとも1つが、内因性若しくは外因性誘導の際に、又は構成的に過剰発現される、請求項1〜11のいずれかに記載の方法。
- 所望のフコシル化オリゴ糖の排出を可能にする又は促進するタンパク質をコードする遺伝子が、糖流出トランスポーターであり、好ましくはyberc0001_9420及びSetAから選択される、請求項9に記載の方法。
- フルクトース−1,6−ビスリン酸ホスファターゼが、ピサム・サチバム(Pisum sativum)由来のフルクトース−1,6−ビスリン酸ホスファターゼ(fbpase)の機能活性バリアントである遺伝子によってコードされる、請求項4〜13のいずれかに記載の方法。
- ラクトースパーミアーゼが、大腸菌のLacYである、請求項10〜13のいずれかに記載の方法。
- ラクトースを提供することが、培養の初期からラクトースを少なくとも5mMの濃度で、好ましくは30、40、50、60、70、80、90、100、150mMの濃度で、より好ましくは300mMを超える濃度で添加することによって達成される、請求項1〜15のいずれかに記載の方法。
- ラクトースを提供することが、培養培地にラクトースを、培養の生産期を通して、少なくとも5mM、好ましくは10mM又は30mMのラクトース濃度が得られるような濃度で添加することによって達成される、請求項1〜16のいずれかに記載の方法。
- 宿主細胞が、少なくとも約60、80、100若しくは約120時間又は連続方式で培養される、請求項1〜17のいずれかに記載の方法。
- 外因性遺伝子が、宿主株のゲノムに組み込まれる、請求項1〜18のいずれかに記載の方法。
- フコシル化オリゴ糖を製造するための原核細胞であって、細胞が、少なくとも(i)改変されていない宿主細胞において通常レベルを有するフルクトース−6−リン酸変換酵素の活性が、低下又は消失される、(ii)GDPフコースのデノボ合成に必要な酵素をコードする少なくとも1つの遺伝子が、過剰発現される、(iii)アルファ−1,2−フコシルトランスフェラーゼ及び/又はアルファ−1,3−フコシルトランスフェラーゼをコードする外因性遺伝子が、細胞内で発現される、ように遺伝子改変されることを特徴とする原核細胞。
- 大腸菌株、ラクトバチルス株又はコリネバクテリウム株から選択される、請求項20に記載の原核細胞。
- フルクトース−6−リン酸の細胞内プールが、(i)ホスホフルクトキナーゼ、グルコース−6−リン酸イソメラーゼ、フルクトース−6−リン酸アルドラーゼ、トランスケトラーゼ若しくはトランスアルドラーゼの群から選択されるフルクトース−6−リン酸変換酵素の活性を低下若しくは消失させること、又は(ii)フルクトース−1,6−ビスリン酸ホスファターゼ活性を増加させることによって、増加される、請求項20又は21に記載の原核細胞。
- GDPフコースのデノボ合成に必要な酵素をコードする遺伝子が、過剰発現される、請求項19〜22のいずれかに記載の原核細胞。
- アルファ−1,2−フコシルトランスフェラーゼ及び/又はアルファ−1,3−フコシルトランスフェラーゼをコードする外因性遺伝子が、アルファ−1,2−フコシルトランスフェラーゼに関しては、大腸菌O126由来のwbgL又はヘリコバクター・ピロリ由来のfucT2、アルファ−1,3−フコシルトランスフェラーゼに関しては、アッカーマンシア・ムシニフィラ、バクテロイデス・フラジリス、ヘリコバクター・ピロリ又はH.ヘパティカスの各種の遺伝子から選択される、請求項19〜23のいずれかに記載の原核細胞。
- フコシル化オリゴ糖、好ましくは2’−フコシルラクトース、3−フコシルラクトース又はジフコシルラクトースの製造のための、請求項19〜24のいずれかに記載の原核細胞の使用。
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RU2019114882A (ru) | 2020-11-30 |
CN109790559A (zh) | 2019-05-21 |
SG11201903024YA (en) | 2019-05-30 |
PH12019550056A1 (en) | 2019-12-11 |
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EP3532632A1 (en) | 2019-09-04 |
ES2856749T3 (es) | 2021-09-28 |
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EP3315610B1 (en) | 2020-12-16 |
US20240200112A1 (en) | 2024-06-20 |
DK3315610T3 (da) | 2021-03-08 |
AU2017351657B2 (en) | 2022-08-04 |
PL3315610T3 (pl) | 2021-06-14 |
WO2018077892A1 (en) | 2018-05-03 |
TW201819636A (zh) | 2018-06-01 |
JP7488937B2 (ja) | 2024-05-22 |
AU2017351657A1 (en) | 2019-04-11 |
KR20190068536A (ko) | 2019-06-18 |
MX2019004867A (es) | 2019-08-14 |
EP3315610A1 (en) | 2018-05-02 |
JP2023093683A (ja) | 2023-07-04 |
BR112019008585A2 (pt) | 2019-09-17 |
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