JP2017221182A - 発酵阻害物質への耐性を有する新規ピキア属酵母 - Google Patents
発酵阻害物質への耐性を有する新規ピキア属酵母 Download PDFInfo
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- JP2017221182A JP2017221182A JP2016239366A JP2016239366A JP2017221182A JP 2017221182 A JP2017221182 A JP 2017221182A JP 2016239366 A JP2016239366 A JP 2016239366A JP 2016239366 A JP2016239366 A JP 2016239366A JP 2017221182 A JP2017221182 A JP 2017221182A
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- Prior art keywords
- pichia
- strain
- fermentation
- membrane
- acetic acid
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Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Landscapes
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
Description
(2)発酵阻害物質が100mM以上の酢酸である、(1)に記載のピキア・メンブレニファシエンス。
(3)26SリボソームRNA遺伝子のD1/D2領域が配列番号1に示される塩基配列と97%以上の同一性を、及び/又は26SリボソームRNA遺伝子のITS領域が配列番号2に示される塩基配列と97%以上の同一性を有する、(1)又は(2)に記載のピキア・メンブレニファシエンス。
(4)以下の形態学的特徴及び生理学的性状を有する、(1)から(3)のいずれかに記載のピキア・メンブレニファシエンス。
<形態学的特徴>
YM寒天培地上で25℃、2日間の培養で直径2〜3mm程度のコロニー(形:円形、隆起状態:半レンズ状、周縁:スムーズ、表面の形状:スムーズ、透明度:半透明、粘ちょう度:粘ちょう性)を形成する。また、子嚢胞子の形成が確認できる。
<生理学的性状>
(6)発酵阻害物質を含む培養液中で(1)から(5)のいずれかに記載のピキア・メンブレニファシエンスを培養することを含む、有用物質の生産方法。
YM寒天培地上で25℃、2日間の培養で直径2〜3mm程度のコロニー(形:円形、隆起状態:半レンズ状、周縁:スムーズ、表面の形状:スムーズ、透明度:半透明、粘ちょう度:粘ちょう性)を形成する。また、子嚢胞子の形成が確認できる。
破砕乾燥したコーンコブ200gに3%(w/v)硫酸を1L添加し、オートクレーブにて121℃、60分間加熱処理した後、10mol/Lの水酸化ナトリウムを用いて、pH5に調整した。これに5gのメイセラーゼ(株式会社明治)を加え、40℃で3日間酵素糖化処理を行い、ろ過により残渣を取り除いたろ液を糖化液とした。ボトルトップフィルターを用いた除菌処理又はオートクレーブ処理を行った糖化液を、以下の実験に用いた。
200mL容量のバッフル付フラスコに用意した20mLのYM培地にフリーズストックを播種し、28℃、200rpmで2日間培養した。培養後、遠心分離機を用いて回収した菌体から、PCR Template Prepalation Kit(ロッシュ社)を用いて、ゲノムDNAを抽出した。
生理性状試験はバーネットら(Barnett et al,Yeasts:Characteristics and identification 3rd edition. Cambridge:Cambridge University Press,2000)及びクルツマンら(Kurtzman et al,The Yeasts,a taxonomic study,5th edition,Amsterdam:Elsevier,2011)に記載の方法に準拠し、温度耐性試験を除き25℃で7日間培養した。
Difco YM brothに寒天を加えたYM寒天培地、BBLコーンミール寒天培地、及び5%麦芽エキス寒天培地で27℃、10日間分離株を培養して、出現したコロニーの目視観察、顕微鏡観察を行なった。
200mL容量のバッフル付フラスコに20mLのYM培地を入れてオートクレーブ処理したものに、KS47−1株及び対照菌株であるS.セレビシエ BY4742株をそれぞれ植菌し、28℃、200rpm、2日間前培養した。200mL容量のバッフル付フラスコに20mLの糖化液を入れてオートクレーブ処理したものに、前培養したKS47−1株及びS.セレビシエ BY4742株をそれぞれ植菌し、28℃、200rpmの条件で2日間培養した。培養中に無菌的に培養液をサンプリングし、分光光度計を用いて600nmの濁度を測定することで、微生物量を推定した。濁度の経時変化を図2に示す。
前記5)と同様にして、P.メンブレニファシエンスの基準株であるP.メンブレニファシエンス NBRC10215、近縁種であるP.manshurica NBRC10726、P.kluyveri NBRC1165、P.deserticola NBRC10716、及びKregervanrija fluxuum NBRC0773の糖化液中の増殖試験を行った。各株の濁度の経時変化を図3に示す。
酢酸を0〜300mMとなるように加えたYM培地(pH5.0)を用いて、KS47−1株、P.メンブレニファシエンス NBRC10215株、S.セレビシエ BY4742株を30℃で48時間培養した。培養後、分光光度計を用いて波長600nmの濁度を測定し、酢酸を含まない培地における濁度を基準として、相対増殖量を算出した。その結果を図4に示す。
200mL容量バッフル付三角フラスコに用意したYM改変培地培地40mL(10%グルコース、250mM酢酸緩衝液(pH5.0)、酵母エキス3.0g/L、麦芽エキス3.0g/L、ペプトン5.0g/L)に、前培養したKS47−1株、P.メンブレニファシエンス NBRC10125株及びS.セレビシエ BY4742株を1mL植菌した。培養温度は30℃とし、培養開始24時間目までは200rpmで、24時間目以降は70rpmで振盪させた。
配列番号2:KS47−1株の26SrRNA遺伝子のD1/D2領域
配列番号3:26SrRNA遺伝子のD1/D2領域増幅用フォワードプライマー
NL1:5’gcatatcaataagcggaggaaaag−3’
配列番号4:26SrRNA遺伝子のD1/D2領域増幅用リバースプライマー
NL4:5’−ggtccgtgtttcaagacgg−3’
配列番号5:26SrRNA遺伝子のITS増幅用フォワードプライマー
ITS1FS:5’−cttgttcatttagaggaataa−3’
配列番号6:26SrRNA遺伝子のITS増幅用リバースプライマー
ITS4:5’−tcctccgcttattgatatgc−3’
Claims (6)
- セルロース系バイオマス由来の糖化液に含まれる発酵阻害物質に耐性を有するピキア・メンブレニファシエンス(Pichia membranifaciens)。
- 発酵阻害物質が100mM以上の酢酸である、請求項1に記載のピキア・メンブレニファシエンス。
- 26SリボソームRNA遺伝子のD1/D2領域が配列番号1に示される塩基配列と97%以上の同一性を、及び/又は26SリボソームRNA遺伝子のITS領域が配列番号2に示される塩基配列と97%以上の同一性を有する、請求項1又は2に記載のピキア・メンブレニファシエンス。
- 受託番号NITE P−02257として寄託されているピキア メンブレニファシエンス(Pichia membranifaciens)KS47−1株。
- 発酵阻害物質を含む培養液中で請求項1から5のいずれかに記載のピキア・メンブレニファシエンスを培養することを含む、有用物質の生産方法。
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