JP2022532627A - グルコース転移酵素を含むグルコース転移ステビオール配糖体生産用組成物及びそれを用いたグルコース転移ステビオール配糖体製造方法 - Google Patents
グルコース転移酵素を含むグルコース転移ステビオール配糖体生産用組成物及びそれを用いたグルコース転移ステビオール配糖体製造方法 Download PDFInfo
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- JP2022532627A JP2022532627A JP2021568034A JP2021568034A JP2022532627A JP 2022532627 A JP2022532627 A JP 2022532627A JP 2021568034 A JP2021568034 A JP 2021568034A JP 2021568034 A JP2021568034 A JP 2021568034A JP 2022532627 A JP2022532627 A JP 2022532627A
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- glucose
- steviol glycoside
- transferred
- rebaugioside
- amino acid
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Abstract
Description
試験管(test tube)にMRS broth(BD Difco)を5mL充填し、その後それにラクトバチルス・マリ(Lactobacillus mali)を接種し、30℃、180rpmで15時間培養した。
標的酵素の存在を確認するために、各画分の砂糖加水分解活性を還元糖の定量法(DNS法)により確認した。
LC-MSにより前記75kDaタンパク質を同定した。
質量分析器(MS)を用いたタンパク質同定のためには、分析するタンパク質をペプチドに断片化する必要がある。
液体クロマトグラフィー質量分析は、Ultimate 3000 RS UHPLC,Q-Exactive Orbitrap(Thermo Scientific)質量分析器で行った。分析条件は次の通りである。
(2)カラム:Acclaim prepMapTM RSLC 50μm×15cm,nanoviper C18,2μm,100A
(3)溶媒:A=蒸留水(0.1%ギ酸を含む),B=アセトニトリル(0.1%ギ酸を含む)
(4)溶出条件
(6)試料注入:1μl
50mM酢酸ナトリウムバッファ(pH5.0)に6%レバウジオシドA(purecircle)又は6%ステビオシド(carbosynth)及び6%白砂糖(CJ第一製糖)を溶解し、その後それに配列番号1のアミノ酸配列を含む酵素を含むラクトバチルス・マリ粗酵素液を添加し、40℃で24時間反応させた。その後、グルコース転移レバウジオシドA又はグルコース転移ステビオシドが生成されたか否かをHPLCで確認した。その結果を図2~図5に示す。一方、HPLC分析条件は次の通りである。
実施例3で確認した、配列番号1のアミノ酸配列を含む酵素の活性を確認した。具体的には、前記酵素がステビオール配糖体にグルコースを転移する活性を有するか否かを確認した。
配列番号1のアミノ酸配列をコードするポリヌクレオチドをポリヌクレオチド合成方法((株)バイオニア)により作製し、得られたポリヌクレオチドをpBT7-N-Hisベクターに挿入し、その後それを大腸菌BL21(DE3)に形質転換した。アンピシリン(Ampicillin)を含む平板培地に形質転換した大腸菌を塗抹し、組換え菌株(微生物)を得た。
50mM酢酸ナトリウムバッファ(pH5.0)に6%レバウジオシドA(purecircle)及び6%白砂糖(CJ第一製糖)を溶解し、その後それに実施例5-1で得られた配列番号1のアミノ酸配列を含む酵素を添加し、40℃で24時間反応させた。その後、グルコース転移レバウジオシドAが生成されたか否かをHPLCで確認した。その結果を図6及び図7に示す。
ステビオール配糖体及びグルコース転移ステビオール配糖体の溶解度を測定した。
従来の物質として知られるα-(1,4)グルコース転移レバウジオシドAと実施例4のα-(1,6)グルコース転移レバウジオシドAをそれぞれ水に溶解し、パネルに提供して実測甘味度と甘味質を評価した。その結果を表5に示す。
Claims (15)
- 配列番号1のアミノ酸配列を含むグルコース転移酵素、それを発現する微生物、又は前記微生物の培養物を含むグルコース転移ステビオール配糖体生産用組成物。
- 前記組成物は、ステビオール配糖体及びグルコース供与体をさらに含む、請求項1に記載の組成物。
- 前記グルコース供与体は、グルコースのオリゴマー、グルコースの重合体又はその環状形態である、請求項2に記載の組成物。
- 前記グルコース転移ステビオール配糖体は、ステビオール配糖体にグルコースがα-(1,6)結合により付加されたものである、請求項1に記載の組成物。
- 前記グルコース転移ステビオール配糖体は、ステビオール配糖体の19-OH位置に結合されたグルコースにα-(1,6)結合によりグルコースが付加されたものである、請求項4に記載の組成物。
- 前記グルコース転移ステビオール配糖体は、ステビオール配糖体にグルコースが1~3個付加されたものである、請求項1に記載の組成物。
- 前記ステビオール配糖体は、ステビオシド、ルブソシド、ズルコシドA、レバウジオシドA、レバウジオシドC、レバウジオシドD、レバウジオシドE、レバウジオシドF及びレバウジオシドMからなる群から選択される少なくとも1つである、請求項1に記載の組成物。
- 配列番号1のアミノ酸配列を含むグルコース転移酵素、それを発現する微生物、又は前記微生物の培養物をステビオール配糖体に接触させるステップを含むグルコース転移ステビオール配糖体製造方法。
- 前記方法は、
配列番号1のアミノ酸配列を含むグルコース転移酵素、それを発現する微生物、又は前記微生物の培養物の存在下でグルコース供与体とステビオール配糖体を反応させるステップを含む、請求項8に記載の製造方法。 - 前記反応させるステップは、pH1~10で行われるものである、請求項9に記載の製造方法。
- 前記反応させるステップは、1~80℃で行われるものである、請求項9に記載の製造方法。
- 前記グルコース転移ステビオール配糖体は、ステビオール配糖体にグルコースがα-(1,6)結合により付加されたものである、請求項8に記載の製造方法。
- 前記グルコース転移ステビオール配糖体は、ステビオール配糖体の19-OH位置に結合されたグルコースにα-(1,6)結合によりグルコースが付加されたものである、請求項12に記載の製造方法。
- 前記グルコース転移ステビオール配糖体は、ステビオール配糖体にグルコースが1~3個付加されたものである、請求項8に記載の製造方法。
- 前記ステビオール配糖体は、ステビオシド、ルブソシド、ズルコシドA、レバウジオシドA、レバウジオシドC、レバウジオシドD、レバウジオシドE、レバウジオシドF及びレバウジオシドMからなる群から選択される少なくとも1つである、請求項8に記載の製造方法。
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KR101997597B1 (ko) * | 2016-11-17 | 2019-07-08 | 서울대학교산학협력단 | 변형 류코노스톡속 균주를 이용한 스테비오사이드 배당체의 합성 방법 및 이에 의하여 제조된 신규한 스테비오사이드 배당체 |
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JP2018139613A (ja) * | 2012-05-22 | 2018-09-13 | ピュアサークル スンディリアン ブルハド | 高純度ステビオールグリコシド |
JP2018509902A (ja) * | 2015-03-10 | 2018-04-12 | レイクスユニフェルシテイト フローニンゲン | ステビオールグリコシドの酵素的修飾方法、それによって得られる修飾ステビオールグリコシド、およびそれらの甘味料としての使用 |
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KR20200143612A (ko) | 2020-12-24 |
CN114521215B (zh) | 2023-11-21 |
US20220220523A1 (en) | 2022-07-14 |
CN114521215A (zh) | 2022-05-20 |
WO2020251228A1 (ko) | 2020-12-17 |
EP3954780A4 (en) | 2022-07-27 |
EP3954780A1 (en) | 2022-02-16 |
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