JP2012529274A - ヒトミルクオリゴ糖の合成 - Google Patents
ヒトミルクオリゴ糖の合成 Download PDFInfo
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- JP2012529274A JP2012529274A JP2012514353A JP2012514353A JP2012529274A JP 2012529274 A JP2012529274 A JP 2012529274A JP 2012514353 A JP2012514353 A JP 2012514353A JP 2012514353 A JP2012514353 A JP 2012514353A JP 2012529274 A JP2012529274 A JP 2012529274A
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- Prior art keywords
- oligosaccharide
- transporter
- cell
- synthesis
- fucose
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 235000020256 human milk Nutrition 0.000 title description 21
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Abstract
Description
a)本発明に係る細胞を提供する工程、
b)目的のオリゴ糖の産生が許容される条件下で、前記細胞を培地中で培養する工程、および
c)前記培地から前記オリゴ糖を抽出する工程
を含むオリゴ糖の産生方法に関する。
グラム陰性菌体内におけるオリゴ糖の合成および輸送
図1に、グラム陰性菌体10の断面図を示す。本発明に係るグラム陰性菌体10は、外膜11、原形質膜12、外膜11と原形質膜12との間にある細胞周辺腔13、および原形質膜12で囲まれたサイトゾル14から構成される。外膜は、ポーリンを含み、水溶性化合物はポーリンを通って培地16から細胞周辺腔13へ、または細胞周辺腔13から培地16へと移動することができる。
材料および方法
2.1 発現プラスミドの構築と大腸菌株の開発
大腸菌由来の産生株を開発するための出発宿主株として、大腸菌JM109(DE3)(プロメガ;www.promega.com)を使用した。表1に、クローニング操作に用いたすべてのオリゴヌクレオチドプライマーを列挙した。プラスミドpACYC−lacYおよびpACYC−lacY−setAの構築は、以下の通り行った。遺伝子lacY(GenBankアクセッションNo.ACB02461に該当)(GenBank;www.ncbi.nlm.nih.gov)および遺伝子setA(GenBankアクセッションNo.YP_025293に該当)(GenBank)を、lacY NcoIフォワードプライマー/lacY EcoRIリバースプライマーおよびsetA NdeIフォワードプライマー/setA XhoIリバースプライマーを用いて、大腸菌TOP10(インビトロジェン;www.invitrogen.com)のゲノムDNAより増幅した。各PCR産物を、それぞれ所定の酵素で制限酵素処理し、対応する酵素で処理した発現ベクターpACYCDuet−1(ノバジェン;www.merckbiosciences.co.uk)に連結した。
外部から供給されるフコースの分解を防ぐために、異化反応における重要な酵素であるL−フクロース−1−リン酸アルドラーゼをコードするfucA遺伝子を大腸菌JM109(DE3)の染色体より欠失させた。この突然変異誘発操作に用いたオリゴヌクレオチドプライマーはすべて表1に列挙した。fucA欠失変異体の構築は、DatsenkoおよびWannerの方法を適用し(DatsenkoおよびWanner(2000))、fucA−knock−fプライマーおよびfucA−knock−rプライマーを用いて行った。染色体の挿入部位を挟む2つのプライマーfucA−control−fおよびfucA−control−rを用いてPCRを行い、fucAが正しく欠失していることを確認した。また、当該菌株がフコース陰性の表現型であることを、唯一の炭素源としてフコースを補充したM9最小寒天培地(SambrookおよびRussell(2001))に菌株を接種することにより確認した(データ示さず)。
一晩培養した大腸菌株を100mLのミネラル培地(Samainら(1999))に1:100で接種した。ミネラル培地には、7.0g/L NH4H2PO4、7.0g/L K2HPO4、1.0g/L MgSO4・7H2O、0.5g/Lクエン酸、2.0g/L KOH、0.0045g/Lチアミン塩酸塩および7.5mL/L微量元素溶液を添加した。微量元素ストック溶液は、70mMニトリロトリ酢酸塩(pH6.5)、7.5g/Lクエン酸鉄(III)、1.3g/L MnCl2・4H2O、0.21g/L CoCl2・6H2O、0.13g/L CuCl2・2H2O、0.25g/L H3BO3、1.2g/L ZnSO4・7H2Oおよび0.15g/L Na2MoO4・2H2Oを含む。上記の培地に、炭素源として0.1%グルコースおよび1%グリセリン、ならびに100μg/mLアンピシリン、50μg/mLカナマイシンおよび/または20μg/mLクロラムフェニコールを添加し、回転式振盪機で十分に通気を行いながら、37℃でインキュベーションを行った。
異種タンパク質が発現していることをSDS−PAGE(SambrookおよびRussell(2001))により確認した(データ示さず)。タンパク質抽出液は1×SDSゲルローディングバッファーを用いて調製した。また、ポリアクリルアミドゲルはクーマシーブリリアントブルーで染色した。
HPLCシステム(島津製作所;www.shimadzu.eu)に連結したDecade IIパルスアンペロメトリック検出器(PAD)(Antec Leyden;www.antec−leyden.nl)およびCarboPac PA20カラム(Dionex;www.dionex.com)を用いて、高速陰イオン交換クロマトグラフィー(HPAEC)によりサンプルを分析した。検出器の検出感度を50μAに設定し、0.05Vのパルス電位を印加した。
組換え大腸菌による3−フコシルラクトースの産生および培地中へのSetA依存性分泌
この試験の目的は、菌体内の3−フコシルラクトースがSetAを介して排出されるか否かを調べることである。大腸菌株JM01およびJM02(表2を参照)を発酵試験に使用した。菌株JM01およびJM02はいずれも、2つの酵素FkpおよびFutAco(α1,3−フコシルトランスフェラーゼ)と、2つの輸送タンパク質FucPおよびLacYとを発現しているが、SetAトランスポーターの発現に関してのみ異なる。すなわち、JM01はSetAを過剰産生していないが、JM02はSetAを過剰産生している。
考察
HPAEC−PAD解析の実験結果により、SetA非過剰発現菌株JM01とSetA過剰発現菌株JM02とでは、3−フコシルラクトースの合成および輸送において大きな違いがあることが示された。
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Claims (17)
- オリゴ糖合成に関与する酵素をコードする核酸配列を少なくとも1つ含むように形質転換されており、培地中で安定して培養可能である、オリゴ糖産生用に調整された細胞であって、糖排出トランスポーターファミリーに属するタンパク質またはその機能的な相同体もしくは誘導体をコードする核酸配列を少なくとも1つ含むようにさらに形質転換されていることを特徴とする細胞。
- 細菌類、真菌類、動物細胞および植物細胞からなる群より選択される請求項1に記載の細胞。
- 大腸菌である請求項2に記載の細胞。
- 前記酵素が、グリコシルトランスフェラーゼ、ルロアール型グリコシルトランスフェラーゼ、非ルロアール型グリコシルトランスフェラーゼ、フコシルトランスフェラーゼ、シアリルトランスフェラーゼ、ガラクトシルトランスフェラーゼ、マンノシルトランスフェラーゼ、N−アセチルグルコサミニルトランスフェラーゼおよびN−アセチルガラクトサミニルトランスフェラーゼを含む群より選択される請求項1〜3のいずれか1項に記載の細胞。
- 前記酵素がフコシルトランスフェラーゼである請求項4に記載の細胞。
- 前記糖排出トランスポーターがSetAまたはその誘導体である請求項1〜5のいずれか1項に記載の細胞。
- オリゴ糖合成に必要な遊離体の取り込みを容易にするか促進するタンパク質をコードする核酸配列を少なくとも1つ含むようにさらに形質転換されている請求項1〜6のいずれか1項に記載の細胞。
- ラクトーストランスポーター、フコーストランスポーター、シアル酸トランスポーター、ガラクトーストランスポーター、マンノーストランスポーター、N−アセチルグルコサミントランスポーター、N−アセチルガラクトサミントランスポーター、ABCトランスポーター、ヌクレオチド活性化糖のトランスポーター、および核酸塩基、ヌクレオシドまたはヌクレオチドのトランスポーターからなる群より選択されるタンパク質をコードする核酸配列を少なくとも1つ含むように形質転換されている請求項7に記載の細胞。
- ヌクレオチジルトランスフェラーゼ、グアニリルトランスフェラーゼ、ウリジリルトランスフェラーゼ、Fkp、L−フコースキナーゼ、フコース−1−リン酸グアニリルトランスフェラーゼ、CMP−シアル酸シンセターゼ、ガラクトースキナーゼ、ガラクトース−1−リン酸ウリジリルトランスフェラーゼ、グルコースキナーゼ、グルコース−1−リン酸ウリジリルトランスフェラーゼ、マンノースキナーゼ、マンノース−1−リン酸グアニリルトランスフェラーゼ、GDP−4−ケト−6−デオキシ−D−マンノースレダクターゼ、グルコサミンキナーゼ、グルコサミンリン酸アセチルトランスフェラーゼ、N−アセチルグルコサミンリン酸ウリジリルトランスフェラーゼ、UDP−N−アセチルグルコサミン 4−エピメラーゼおよびUDP−N−アセチルグルコサミン 2−エピメラーゼからなる群より選択されるタンパク質をコードする核酸配列を少なくとも1つ含むようにさらに形質転換されている請求項1〜8のいずれか1項に記載の細胞。
- オリゴ糖合成に関与しかつ/または該合成に必要とされる選択された単糖、二糖またはオリゴ糖の異化代謝経路が、少なくとも部分的に不活化されている請求項1〜9のいずれか1項に記載の細胞。
- 前記オリゴ糖が少なくとも3つのサブユニットを含み、かつ/または分子量が少なくとも約480g/molである請求項1〜10のいずれか1項に記載の細胞。
- a)請求項1〜11のいずれか1項に記載の細胞を提供する工程、
b)目的のオリゴ糖の産生が許容される条件下で、前記細胞を培地中で培養する工程、および
c)前記培地から前記オリゴ糖を抽出する工程
を含むオリゴ糖の産生方法。 - 工程b)が、連続フロー型バイオリアクターを使用して行われる請求項12に記載の方法。
- 工程b)の培地が、細胞の成長および増殖を維持するために必要な基本的な補助剤、選択用薬剤、オリゴ糖合成に必要な遊離体、ならびに遺伝子活性のエフェクターからなる群より選択される1以上の物質を含む請求項12または13に記載の方法。
- 前記遊離体が、アラビノース、トレオース、エリスロース、リボース、リブロース、キシロース、グルコース、D−2−デオキシ−2−アミノ−グルコース、N−アセチルグルコサミン、グルコサミン、フルクトース、マンノース、ガラクトース、N−アセチルガラクトサミン、ガラクトサミン、ソルボース、フコース、N−アセチルノイラミン酸、グリコシド、非天然糖、核酸塩基、ヌクレオシド、ヌクレオチド、およびこれらから構成可能なダイマーまたはポリマーからなる群より選択される請求項14に記載の方法。
- 前記オリゴ糖が少なくとも3つのサブユニットを含み、かつ/または分子量が少なくとも約480g/molである請求項12〜15のいずれか1項に記載の方法。
- 前記オリゴ糖がフコシルラクトースである請求項16に記載の方法。
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BRPI0924899A2 (pt) | 2021-02-23 |
CN102459605A (zh) | 2012-05-16 |
DK2440661T3 (en) | 2018-03-12 |
US9512433B2 (en) | 2016-12-06 |
US20140120611A1 (en) | 2014-05-01 |
RU2517602C2 (ru) | 2014-05-27 |
NZ597129A (en) | 2012-12-21 |
EP2440661B1 (en) | 2017-12-06 |
EP2440661A1 (en) | 2012-04-18 |
WO2010142305A1 (en) | 2010-12-16 |
US20120135467A1 (en) | 2012-05-31 |
US8652808B2 (en) | 2014-02-18 |
ES2660698T3 (es) | 2018-03-23 |
BRPI0924899B1 (pt) | 2022-03-22 |
CN106978382A (zh) | 2017-07-25 |
SG176651A1 (en) | 2012-01-30 |
MY182355A (en) | 2021-01-20 |
PL2440661T3 (pl) | 2018-06-29 |
AU2009347610A1 (en) | 2012-01-12 |
RU2011153792A (ru) | 2013-07-20 |
MX2011013231A (es) | 2012-01-20 |
AU2009347610B2 (en) | 2013-02-21 |
BRPI0924899B8 (pt) | 2023-01-31 |
JP5580408B2 (ja) | 2014-08-27 |
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