JP2019519238A - タガトース−6−リン酸特異的で新規な耐熱性のホスファターゼ及びそれを用いたタガトース製造方法 - Google Patents
タガトース−6−リン酸特異的で新規な耐熱性のホスファターゼ及びそれを用いたタガトース製造方法 Download PDFInfo
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- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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Abstract
【選択図】なし
Description
新規な耐熱性のタガトース−6−リン酸ホスファターゼ(D-tagatose-6-phosphate phosphatase)を見出すために、好熱性微生物であるサーモトガ・ネアポリタナ(Thermotoga neapolitana)から遺伝子を分離し、組換え発現ベクター及び形質転換微生物を作製した。
組換えタガトースホスファターゼ(以下、T6PP)を作製するために、LB液体培地5mlを含む培養チューブにE.coli BL21(DE3)/CJ_tn_t6ppを接種し、600nmでの吸光度が2.0になるまで37℃の振盪培養器で種菌培養を行った。その後、LB液体培地を含む培養フラスコに種菌培養を行った培養液を接種して本培養を行い、600nmでの吸光度が2.0になったら1mM IPTGを添加してT6PPの発現生産を誘導した。前記種菌培養及び本培養は、攪拌速度200rpm、温度37℃で行った。培養終了後、培養液を8,000×g、4℃で20分間遠心分離して菌体を回収した。前記回収した菌体を50mM Tris−HCl(pH7.0)緩衝液で2回洗浄し、同じ緩衝液に懸濁して超音波細胞破砕機で細胞を破砕した。細胞破砕物を13,000×g、4℃で20分間遠心分離して上清のみ回収し、His−tagアフィニティークロマトグラフィーを用いて前記上清からT6PPを精製した。
T6PPのタガトース−6−リン酸からタガトースへの変換活性の分析のために、50mM Tris−HCl(pH7.5)緩衝液に50mMタガトース−6−リン酸を懸濁し、それに0.1unit/mlの精製したT6PPと10mM MgCl2を添加して70℃で10分間反応させ、その後HPLCを用いて反応結果物を分析した。HPLC分析は、HPX−87H(Bio-Rad社)カラムを用いて、60℃で5mM硫酸を移動相として0.6ml/minの流速で流して行い、Refractive Index Detectorでタガトースとタガトース−6−リン酸を検出した。
4−1.pHによる活性確認
T6PPに対するpHの影響を調査するために、様々なpHの50mM緩衝液(pH4.0〜7.0のクエン酸ナトリウム、pH4.0〜7.0の酢酸ナトリウム、pH6.0〜8.0のリン酸カリウム、pH7.0〜9.0のTris−HCl)に懸濁された50mMタガトース−6−リン酸に0.1unit/mlの精製されたT6PPを添加して70℃で10分間反応させた。その後、実施例3と同じ分析条件でHPLCを用いてタガトースを定量分析した。
温度によるT6PPの活性分析のために、50mM Tris−HCl(pH7.0)緩衝液に懸濁された50mMタガトース−6−リン酸に0.1unit/mlの精製されたT6PPを添加して40℃、50℃、60℃、70℃、80℃及び90℃で10分間反応させた。その後、実施例3と同じ分析条件でHPLCを用いてタガトースを定量分析した。
金属イオン添加がT6PPの活性に及ぼす影響を調査するために、50mM Tris−HCl(pH7.0)緩衝液に懸濁された50mMタガトース−6−リン酸に各金属イオン(NiSO4、CuSO4、MnSO4、CaCl2、ZnSO4、MgCl2、CoSO4及びAPO)を最終濃度0.5mMで添加した。次に、金属イオンの除去のために、10mM EDTAで処理して透析したT6PPを0.1unit/mlで添加して70℃で10分間反応させた。その後、実施例3と同じ分析条件でHPLCを用いてタガトースを定量分析した。
T6PPがタガトース−6−リン酸に対して基質特異性を有するか否かを確認するために、様々なリン酸化糖に対するT6PPの活性を分析した。基質として50mMのグルコース−1−リン酸、グルコース−6−リン酸、フルクトース−6−リン酸及びタガトース−6−リン酸をそれぞれ用いて、50mM Tris−HCl(pH7.0)緩衝液及び1unit/mlの精製されたT6PPを添加して70℃で1時間反応させ、その後実施例3と同じ分析条件でHPLCを用いて各糖及びリン酸化糖を定量分析した。
Claims (15)
- 配列番号1のアミノ酸配列からなるタガトース−6−リン酸ホスファターゼ(tagatose-6-phosphate phosphatase)。
- 請求項1に記載のタガトース−6−リン酸ホスファターゼをコードする核酸。
- 請求項2に記載の核酸を含む形質転換体。
- 配列番号1のアミノ酸配列からなるタガトース−6−リン酸ホスファターゼ、それを発現する微生物、又は前記微生物の培養物を含むタガトース生産用組成物。
- 前記タガトース生産用組成物は、
(a)(i)デンプン、マルトデキストリン、スクロースもしくはその組み合わせ、(ii)ホスフェート(phosphate)、(iii)フルクトース−6−リン酸−4−エピメラーゼ、(iv)グルコース−6−リン酸−イソメラーゼ、(v)ホスホグルコムターゼもしくはグルコキナーゼ、及び(vi)α−グルカンホスホリラーゼ、デンプンホスホリラーゼ、マルトデキストリンホスホリラーゼ、スクロースホスホリラーゼ、α−アミラーゼ、プルラナーゼ、イソアミラーゼ、グルコアミラーゼもしくはスクラーゼ、又は
(b)前記項目(a)の酵素を発現する微生物、もしくは前記微生物の培養物をさらに含む、請求項4に記載のタガトース生産用組成物。 - タガトース−6−リン酸に配列番号1のアミノ酸配列からなるタガトース−6−リン酸ホスファターゼ、それを発現する微生物、又は前記微生物の培養物を接触させることにより、タガトース−6−リン酸をタガトースに変換するステップを含むタガトース製造方法。
- 前記方法は、タガトース−6−リン酸をタガトースに変換するステップの前に、フルクトース−6−リン酸(fructose-6-phosphate)にフルクトース−6−リン酸−4−エピメラーゼ、それを発現する微生物、又は前記微生物の培養物を接触させることにより、前記フルクトース−6−リン酸をタガトース−6−リン酸に変換するステップをさらに含む、請求項6に記載のタガトース製造方法。
- 前記方法は、前記フルクトース−6−リン酸をタガトース−6−リン酸に変換するステップの前に、グルコース−6−リン酸(Glucose-6-phosphate)にグルコース−6−リン酸−イソメラーゼ、それを発現する微生物、又は前記微生物の培養物を接触させることにより、前記グルコース−6−リン酸をフルクトース−6−リン酸に変換するステップをさらに含む、請求項7に記載のタガトース製造方法。
- 前記方法は、前記グルコース−6−リン酸をフルクトース−6−リン酸に変換するステップの前に、グルコース−1−リン酸(Glucose-1-phosphate)にホスホグルコムターゼ、それを発現する微生物、又は前記微生物の培養物を接触させることにより、前記グルコース−1−リン酸をグルコース−6−リン酸に変換するステップをさらに含む、請求項8に記載のタガトース製造方法。
- 前記方法は、前記グルコース−6−リン酸をフルクトース−6−リン酸に変換するステップの前に、グルコース(Glucose)にグルコキナーゼ、それを発現する微生物、又は前記微生物の培養物、及びホスフェートを接触させることにより、前記グルコースをグルコース−6−リン酸に変換するステップをさらに含む、請求項8に記載のタガトース製造方法。
- 前記方法は、前記グルコース−1−リン酸をグルコース−6−リン酸に変換するステップの前に、デンプン、マルトデキストリン、スクロース又はその組み合わせに、α−グルカンホスホリラーゼ、デンプンホスホリラーゼ、マルトデキストリンホスホリラーゼもしくはスクロースホスホリラーゼ、それを発現する微生物、又は前記微生物の培養物、及びホスフェートを接触させることにより、前記デンプン、マルトデキストリン、スクロース又はその組み合わせをグルコース−1−リン酸に変換するステップをさらに含む、請求項9に記載のタガトース製造方法。
- 前記方法は、前記グルコースをグルコース−6−リン酸に変換するステップの前に、デンプン、マルトデキストリン、スクロース又はその組み合わせに、α−アミラーゼ、プルラナーゼ、グルコアミラーゼ、スクラーゼもしくはイソアミラーゼ、それを発現する微生物、又は前記微生物の培養物を接触させることにより、前記デンプン、マルトデキストリン、スクロース又はその組み合わせをグルコースに変換するステップをさらに含む、請求項10に記載のタガトース製造方法。
- 前記接触は、pH5.0〜8.0で、温度60℃〜90℃で、及び/又は1分〜24時間行う、請求項6〜12のいずれか一項に記載のタガトース製造方法。
- 前記接触は、Mg、Mn及びZnからなる群から選択される金属のイオン又は塩の存在下で行う、請求項6〜12のいずれか一項に記載のタガトースの製造方法。
- デンプン、マルトデキストリン、スクロース又はその組み合わせ、及びホスフェートに、(a)請求項1に記載のタガトース−6−リン酸ホスファターゼ、フルクトース−6−リン酸−4−エピメラーゼ、グルコース−6−リン酸−イソメラーゼ、ホスホグルコムターゼもしくはグルコキナーゼ、及びα−グルカンホスホリラーゼ、デンプンホスホリラーゼ、マルトデキストリンホスホリラーゼ、スクロースホスホリラーゼ、α−アミラーゼ、プルラナーゼ、イソアミラーゼ、グルコアミラーゼもしくはスクラーゼ、又は(b)前記項目(a)の酵素を発現する微生物、もしくは前記微生物の培養物を接触させるステップを含むタガトース製造方法。
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