JP5631862B2 - エコール産生細菌及びその利用 - Google Patents
エコール産生細菌及びその利用 Download PDFInfo
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- JP5631862B2 JP5631862B2 JP2011501510A JP2011501510A JP5631862B2 JP 5631862 B2 JP5631862 B2 JP 5631862B2 JP 2011501510 A JP2011501510 A JP 2011501510A JP 2011501510 A JP2011501510 A JP 2011501510A JP 5631862 B2 JP5631862 B2 JP 5631862B2
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- equol
- ability
- slackia
- daidzein
- bacteria
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Description
また、エコール濃度は、液体クロマトグラフィー、LC−MS等の常法に従って測定することができる。
本発明の「ダイゼインからのエコール変換能が24時間で50%以上である微生物」とは上記のエコール変換能が24時間の保温により50%以上である微生物を指す。さらに、24時間の保温で80%以上、より好ましくは100%である微生物を好適に利用することができる。また、より短時間の保温、例えば8時間の保温で50%以上である微生物も好適に利用することができる。これらの一例としてSlackia属細菌を挙げることができる。
(a)配列番号1又は2で示される塩基配列若しくはそれと相補的な塩基配列からなる核酸断片において、1又は数個、好ましくは1乃至10個の塩基が欠失、置換若しくは付加された塩基配列からなる核酸断片。
(b)配列番号1又は2で示される塩基配列若しくはそれと相補的な塩基配列と90%以上、好ましくは95%以上、より好ましくは99%以上の同一性を有する塩基配列からなる核酸断片。
(c)配列番号1又は2で示される塩基配列若しくはそれと相補的な塩基配列からなるDNAとストリンジェントな条件下でハイブリダイズする塩基配列からなる核酸断片。
健常エコールプロデューサーの新鮮排泄便をガラスビーズ(φ3mm)存在下で10倍容の嫌気状態の希釈液(KH2PO4 0.00255%, K2HPO4 0.00255%, NaCl 0.006%, (NH4)2SO4 0.00255%, CaCl2 0.000255%, MgSO4 0.000255%, 0.1%レサズリン溶液0.1%, 8% Na2CO3溶液2.2%, L−システイン塩酸塩0.05%)に良く懸濁し、滅菌ガーゼを用いて残渣を除去した。8,000xg、10分の遠心分離を行い、沈殿を同量の同希釈液にて懸濁した。この状態で−30℃にて凍結保存した。使用時に解凍した糞便希釈液を8,000xg、10分の遠心分離を行い、得られた沈殿についてソルボースを糖源としたPY培地(ペプトン0.5%、トリプチケースペプトン0.5%、イーストエキス1%、ヘミン0.00005%、ビタミンK1 0.0001%、L−システイン塩酸塩0.05%、KH2PO4 0.0006%、K2HPO4 0.0006%、NaCl 0.0012%、(NH4)2SO4 0.0006%、CaCl2 0.00006%、MgSO4 0.00006%)に懸濁した。37℃、混合ガス(N2:H2:CO2=88:7:5)存在下で24〜48時間インキュベートした。これを7代まで継代した培養物について、同培地を用いて106倍希釈液を調整した。この希釈液50μLについて、それぞれ20枚のGAM(1%glucose加)寒天平板培地に塗沫した。それらを37℃、72h、嫌気グローブボックス内でインキュベートしコロニーを形成させた。得られたコロニーについて、コロニー性状(表面性状、大きさ)およびグラム染色像から、26種類に分類した。それぞれの代表コロニーについて終濃度100μMのダイゼインを含むGAM(1%glucose加)液体培地に植菌した。37℃、24h、混合ガス(N2:H2:CO2=88:7:5)存在下でインキュベートした培養液についてHPLCにてエコール濃度を測定した結果、高いダイゼイン−エコール変換能を有するグラム陽性桿菌を見出した。なお、HPLC条件は次の条件で行った。
カラム:YMC−Pack CN(Y.M.C製)
検出:紫外吸光光度計(測定波長280nm)
カラム温度:40℃
移動相:0.1%蟻酸溶液/アセトニトリル/メタノール(87:3:10)混液
流量:2.5mL/min
サンプル注入量:10μl
試験例1で単離した細菌ゲノムを鋳型として、プライマー27f(配列番号3)および1552r(配列番号4)を用いて、16S ribosomal RNA(16S rRNA)を標的にPCRを行い、約1500bpの増幅産物を得た。それを鋳型として、シーケンシングPCRを行った。シーケンシングPCRには、BigDye(R)Terminator v3.1 Cycle Sequencing Kit(Applied Biosystems)を用い、製品マニュアルに準じた方法で行った。シーケンサーには、AB 3130ジェネティックアナライザ(Applied Biosystems)を用いた。16S rRNA配列の分子系統解析および相同性解析には、Clustal X v1.83、TreeView v1.6.6およびGENETIX(R) Ver.7(株式会社 ゼネティックス)を用いた。その結果、本菌株はコリオバクテリア科に属することが明らかとなった(図1)。Slackia exigua ATCC 700122Tが系統的に最も近縁な既存の菌種であったが、相同性は低値を示した(92.4%)。特許文献3記載のSlackia spp.TM−30とは99%以上の相同性を有しており、データベース上に登録されている未培養菌株と併せて一群のクラスターを形成していた。このことから本菌株とSlackia spp.TM−30は同種である可能性が示された。
本菌株および16S rRNA配列解析より既存種で最も系統的に近いS. exigua ATCC 700122Tについて、ラピッドID 32A(シスメックス・ビオメリュー株式会社)を用いて生化学性状を調べた。供試菌の培養には、GAM(1%glucose加)寒天培地を用い、37℃にて24時間、嫌気条件下で培養した。なお、同定キット1つにつき2枚分のGAM(1%glucose加)寒天培地を用いた。キットへの供試菌液の調整、反応そして判定は、キット附属のマニュアルに従った。その結果を表1に示した。エコール変換能を有する細菌は、ラピッドID 32Aにおいて、S.exigua ATCC 700122Tとは大きく異なる性状を示した。また、エコール変換能を有する細菌は、ラピッドID 32AでD−マンノース、D−ラフィノースの資化性、アルカリホスファターゼが陽性を示した点において特許文献3に記載のSlackia spp. TM−30の生化学性状と異なっていた。したがって、既報の株とは異なる事が明らかとなった。以上の分子生物学的および生化学性状試験結果より本菌株は、Slackia属に含まれる新規な株と考えられ、Slackia属細菌YIT 11861(Slackia sp. YIT 11861)と命名した。
結果を表2に記載した。併せて、特許あるいは論文で公表されている菌株の活性を調査し比較した。その結果、Slackia sp. YIT 11861は、100μMのダイゼインを8時間のインキュベートで95%、24時間で100%、400μMのダイゼインを24時間で94%、96時間では100%エコールに変換した。一方、gram positive bacterium do−03株(非特許文献3)では193μMのダイゼインを48時間で33%(初発菌体濃度:未記載、最終菌体濃度:OD660=0.277、これより106〜108個/mL・培地と推定される)、TM−30株では、391μMのダイゼインを24時間でわずか1%程度(初発菌体濃度:未記載、最終菌体濃度:109個/培地・mL)、またL.gariviae 92−90株ではわずか42μMのダイゼインを100%エコールに変換するのに72時間を要し、24時間でのエコール変換は0%であった(初発菌体濃度:107個/培地・mL)。以上のことから、Slackia sp. YIT 11861のダイゼイン−エコール変換活性は、既存の菌株に比べ非常に高い活性を有していることが明らかとなった。
Slackia sp. YIT 11861に特異的な配列をもとにプライマーの設計を行った。公共データベース(DDBJ/GENEBANK/EMBL)よりコリオバクテリア科の16S rRNA配列を入手し、得られた配列をもとにClustal X v1.83を用い近縁種のrRNA配列と併せて整列を行い、特異的な領域についてプライマーeq430−F/eq665−Rを設計した(配列番号1及び2)。Slackia sp. YIT 11861菌体(2×108個/mL)から抽出したRNAを、2×106から2×10−1個/mL相当となるように10倍段階希釈をした。この希釈RNAを1反応あたり5μlを鋳型として、定量的RT−PCRを行った。定量的RT−PCRにはOneStep RT−PCR kit(QIAGEN)を用いた。反応液は50℃で30分間逆転写反応を行い、その後逆転写酵素を失活させるため95℃で15分間加熱した。続いて、94℃20秒、60℃20秒、72℃50秒を1サイクルとして45サイクル行った。その結果、本プライマーによるPCR増幅は、1反応あたり10−3から103個の範囲で菌数と相関を示した。糞便1gあたりに換算すると103個の菌体を定量可能であることが明らかとなった(図2)。
プライマーの特異性の検討には、表3に記載の代表的な腸内細菌、感染症起因菌およびコリオバクテリア科に属する近縁種を対象とした。DAPI染色法によりあらかじめ菌数を測定しておいた各菌株の純培養菌液よりRNAを抽出し、2×108個/mL相当となるようにRNA濃度を調整した。一反応に対して、RNAを1×105個/mL相当供試し、上述の条件により定量的RT−PCRを行った。上述のプライマーについて、代表的な腸内細菌、感染症起因菌およびコリオバクテリア科に属する近縁種を対象として、その反応性を検討した。その結果を表3に記載した。表3において、+:CT値≧40,−:CT値<40を示す。
本プライマーは、Slackia sp. YIT 11861に対してのみ高い特異性を有していた。一方、他の対象菌株に対する交差反応は一切確認されなかった。また、RNAサンプルの換わりにNuclease−free waterを加えた反応における非特異的産物の増幅は認められなかった。
配列番号1及び2のプライマーを用いて、40名の健常成人ボランティアの糞便RNAを対象に定量的RT−PCRを行った。新鮮なボランティアの糞便20mgより、AGPC法により全RNAを抽出した。この全RNAを適宜希釈し、定量的RT−PCRを行った。反応は、試験例4に記載の方法に従った。あらかじめ菌数がわかっているSlackia sp. YIT 11861より抽出したRNAの反応性を指標として、サンプル中のSlackia sp. YIT 11861の菌数を算出した。その結果、Slackiasp. YIT 11861は、40名中16名(40%)より6.4±2.4(Log10個/g・糞便)の菌数で検出された。
10Lのダイゼイン含有ソルボース−PY培地(ダイゼイン0.025%、ソルボース1%、ペプトン0.5%、トリプチケースペプトン0.5%、イーストエキス1%、ヘミン0.00005%、ビタミンK1 0.0001%、L−システイン塩酸塩0.05%、KH2PO4 0.0006%、K2HPO4 0.0006%、NaCl 0.0012%、(NH4)2SO4 0.0006%、CaCl2 0.00006%、MgSO4 0.00006%)に、108個/培地・mLのSlackia sp. YIT11861を添加し、37℃、96h、混合ガス(N2:H2:CO2=88:7:5)存在下でインキュベートした。培養液を遠心分離(8000xg、15分間)し、その上清に等量のジエチルエーテルを添加した。良く攪拌後、遠心分離(1000xg、2分間)により2層に分離し、ジエチルエーテル層のみを分取した。ジエチルエーテル層を40℃、窒素気流下にて乾固させ、2.4gのエコールを得た。
下記表4の処方で各種成分を混合して造粒・乾燥・整粒した後に、打錠して錠剤を製造した。
下記表5処方により、常法に従って各成分を配合し、均質化して清涼飲料を得た。得られた清涼飲料は褐色瓶に充填後、アルミキャップにて封印し、加熱処理を施した。
Claims (6)
- Slackia sp. YIT 11861(FERM BP−11231)。
- Slackia sp. YIT 11861(FERM BP−11231)を含有することを特徴とする飲食用又は医薬用組成物。
- さらにアドニトール、アラビノース、エリスリトール、ガラクトース、ラクチトール、メレチトース、トレハロース、リボース、ソルボース、キシロース、イノシトール及びソルビトールから選ばれる1以上を含有することを特徴とする請求項2記載の組成物。
- さらにダイゼインを含有することを特徴とする請求項2又は3記載の組成物。
- Slackia sp. YIT 11861(FERM BP−11231)をダイゼインに作用させることを特徴とするエコールの製造方法。
- 配列番号1又は2記載の塩基配列若しくはそれと相補的な塩基配列からなる核酸断片。
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JPN6010026185; 赤座英之: '前立腺がん予防と腸内細菌' ヘルシスト No.192, 2008, pp.2-7 * |
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AU2010219067C1 (en) | 2015-06-04 |
AU2010219067B2 (en) | 2015-02-19 |
EP2402429B1 (en) | 2017-09-13 |
US8420073B2 (en) | 2013-04-16 |
US20110318309A1 (en) | 2011-12-29 |
CN102317435B (zh) | 2014-08-06 |
CA2753103A1 (en) | 2010-09-02 |
AU2010219067A1 (en) | 2011-09-15 |
CA2753103C (en) | 2017-09-12 |
KR20110129875A (ko) | 2011-12-02 |
WO2010098103A1 (ja) | 2010-09-02 |
JPWO2010098103A1 (ja) | 2012-08-30 |
KR101780509B1 (ko) | 2017-09-21 |
ES2641604T3 (es) | 2017-11-10 |
CN102317435A (zh) | 2012-01-11 |
EP2402429A4 (en) | 2015-03-11 |
EP2402429A1 (en) | 2012-01-04 |
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