JP7443656B2 - レチニルエステルの生産 - Google Patents
レチニルエステルの生産 Download PDFInfo
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- JP7443656B2 JP7443656B2 JP2020512716A JP2020512716A JP7443656B2 JP 7443656 B2 JP7443656 B2 JP 7443656B2 JP 2020512716 A JP2020512716 A JP 2020512716A JP 2020512716 A JP2020512716 A JP 2020512716A JP 7443656 B2 JP7443656 B2 JP 7443656B2
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- Prior art keywords
- retinol
- host cell
- retinyl
- trans
- acetyltransferase
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P23/00—Preparation of compounds containing a cyclohexene ring having an unsaturated side chain containing at least ten carbon atoms bound by conjugated double bonds, e.g. carotenes
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1025—Acyltransferases (2.3)
- C12N9/1029—Acyltransferases (2.3) transferring groups other than amino-acyl groups (2.3.1)
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/045—Hydroxy compounds, e.g. alcohols; Salts thereof, e.g. alcoholates
- A61K31/07—Retinol compounds, e.g. vitamin A
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/67—Vitamins
- A61K8/671—Vitamin A; Derivatives thereof, e.g. ester of vitamin A acid, ester of retinol, retinol, retinal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/10—General cosmetic use
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- Engineering & Computer Science (AREA)
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- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Bioinformatics & Cheminformatics (AREA)
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- Biochemistry (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Epidemiology (AREA)
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- Birds (AREA)
- Dermatology (AREA)
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- Molecular Biology (AREA)
- Pharmacology & Pharmacy (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Cosmetics (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Enzymes And Modification Thereof (AREA)
Description
(b)少なくとも約65~90%をトランス-レチノールとしてトランス-及びシス-レチノールを含むレチノールを、シス-及びトランス-酢酸レチニルを含む酢酸レチニル混合物に酵素変換するステップと、
(c)適切な培養条件下で酢酸レチニルをビタミンAに変換するステップと
を含む、ビタミンAの生産プロセス。
(b)レチノールを、少なくとも約4:1の比率のトランス-及びシス-酢酸レチニルを含む酢酸レチニル混合物に酵素変換するステップと、
(c)適切な培養条件下でレチノールをビタミンAに変換するステップと
を含む、ビタミンAの生産プロセス。
[実施例1:一般的な方法、菌株、及びプラスミド]
本明細書に記載される全ての基本的な分子生物学及びDNA操作手順は、一般的に、Sambrook et al.(eds.),Molecular Cloning:A Laboratory Manual.Cold Spring Harbor Laboratory Press:New York(1989)、又はAusubel et al.(eds).Current Protocols in Molecular Biology.Wiley:New York(1998)に従って実施される。
通常、800μlの0.25%酵母抽出物、0.5%ペプトン(0.25X YP)に、10μlの新たに成長させたヤロウイア属(Yarrowia)を播種し、800μlの鉱油(Drakeol5、Penreco Personal Care Products,Karns City,PA,USA)でオーバーレイし、炭素源として鉱油中5%のコーン油及び/又は水相中5%のグルコースを用いた。24ウェルプレート(Microplate Devices 24 Deep Well Plates Whatman 7701-5102)において形質転換体を成長させ、マットシール(Analytical Sales and Services Inc.Plate Mats 24010CM)で被覆し、Qiagen Airpore Tape Sheets(19571)で無菌密封し、Inforsマルチプレートシェーカー(Multitron)においてYPD培地中30℃、800RPMで4日間振とうさせた。鉱油画分を振とうプレートウェルから取り出し、フォトダイオードアレイ検出器を用いて、順相カラムでHPLCにより分析した。この方法は実施例2、3、4において使用される。
菌株をYPDプレート培地上で一晩成長させることにより形質転換させる。50μlの細胞をプレートからこすり取り、1μgの形質転換DNA、通常は組込み形質転換のための直鎖DNA、40%のPEG 3550MW、100mMの酢酸リチウム、50mMのジチオスレイトール、5mMのTris-Cl(pH8.0)、0.5mMのEDTAを含む500μl中、40℃で60分間のインキュベーションにより形質転換させ、選択培地に直接プレーティングするか、或いは優性抗生物質マーカー選択の場合は、細胞をYPD液体培地において30℃で4時間増殖させた後、選択培地にプレーティングする。
pUC57ベクター(GenScript,Piscataway,NJ)においてNhel及びMlul末端を用いて遺伝子を合成した。国際公開第2016172282号パンフレットの場合のように、通常、ヤロウイア・リポリティカ(Yarrowia lipolytica)形質転換におけるマーカー選択のために、遺伝子をMB5082「URA3」、MB6157HygR、及びMB8327NatRベクターにサブクローニングした。遺伝子及びマーカーHindlll/Xbal(MB5082)又はPvull(MB6157及びMB8327)のランダム非相同末端結合によるクリーンな遺伝子挿入のために、それぞれゲル電気泳動及びQiagenゲル精製カラムにより精製した。MB5082「URA3」マーカーは、FOAにおけるURA3カセットの環状切除(circular excisant)の選択を可能にする無償性の反復隣接配列のために再使用が可能であった。NatR及びHygRマーカーは、隣接Lox部位のために切除をもたらすCreリコンビナーゼの一過性発現によって除去することができる。
使用するプラスミド、菌株、ヌクレオチド及びアミノ酸配列は、表1、2及び配列表に記載される。ヌクレオチド配列番号2、4、6、8、10、12、15、17及び19は、ヤロウイア属(Yarrowia)における発現に対してコドン最適化される。
Waters 717オートサンプラーに取り付けたWaters 1525バイナリーポンプを用いて、サンプルを注入した。安全シリカガードカラムキットを有するPhenomenex Luna 3μ Silica(2),150x4.6mmを使用して、レチノイドを分離した。移動相は、アスタキサンチン関連化合物に対する1000mLのヘキサン、30mLのイソプロパノール、及び0.1mLの酢酸、又はゼアキサンチン関連化合物に対する1000mLのヘキサン、60mLのイソプロパノール、及び0.1mLの酢酸のいずれかからなる。それぞれの流速は、0.6mL/分である。カラム温度は周囲温度である。注入容積は20μLである。検出器は、210nmから600nmまでを収集するフォトダイオードアレイ検出器である。表3に従って分析物を検出した。
条件に応じて種々の方法によりサンプルを調製した。全培養液又は洗浄培養液サンプルのために、秤量したPrecellys(登録商標)管に培養液を入れ、移動相を添加した。製造指示書に従って最高設定3XにおいてPrecellys(登録商標)ホモジナイザー(Bertin Corp,Rockville,MD,USA)内でサンプルを処理した。洗浄培養液中、サンプルを微量遠心管において10000rpmで1分間、1.7ml管内で回転させ、培養液をデカントし、1mlの水を添加し、混合し、ペレットにし、デカントして、元の容積にした。混合物を再度ペレットにし、適切な量の移動相中に入れ、Precellys(登録商標)ビーズビーティングにより処理した。鉱油画分の分析のために、サンプルを4000RPMで10分間回転させ、ポジティブディスプレイスメントピペット(Eppendorf,Hauppauge,NY,USA)により油を上部からデカントして除去し、移動相中に希釈し、ボルテックスにより混合し、HPLC分析によりレチノイド濃度を測定した。
発酵は既に記載された条件と同一であり、好ましくはシリコーン油又は鉱油のオーバーレイと、好ましくは、0.5L~5Lの全容積のベンチトップ反応器内に供給されたグルコース又はコーン油である攪拌槽とを用いた(国際公開第2016172282号パンフレットを参照)。一般的に、生産性が増大された流加バッチ攪拌漕反応器を用いて同じ結果が観察され、レチノイドの生産のためのシステムの有用性が実証された。好ましくは、5%のグルコースを用いて発酵をバッチ処理し、溶解酸素が急落した後に20%のシリコーン油を添加し、供給を再開して、供給プログラムを通して20%の溶解酸素を達成した。或いは、供給物としてコーン油を使用し、脂肪族レチノイドを捕集するための第2の相として鉱油を使用した。
異種ATF1の発現のために、トランスレチノール産生菌株ML17968を、100ug/mlのハイグロマイシンを含有するリッチ培地(YPD)での選択のためにハイグロマイシン耐性マーカー(HygR)に連結されたアセチルトランスフェラーゼ遺伝子断片を含有する精製Pvull遺伝子断片で形質転換した。プレーティングの前に培養物をYPD中で4時間増殖させて、抗生物質耐性遺伝子を合成した。特に、オーバーレイとしてのシリコーン油と共に0.25X YP中の炭素源として10%のグルコースを用いて、振とうプレートアッセイにおいてアシル化について単離株をスクリーニングし、成功した単離株をグルコース供給物及びシリコーン油オーバーレイと共に流加バッチ攪拌漕反応器においてさらにスクリーニングし、生産性の一桁の増大が示され、レチノイドの生産における有用性が示された。分析からのデータは表4に示される。
通常、ベータカロテン菌株は、当該技術分野において知られている(例えば、米国特許出願公開第20160130628号明細書又は国際公開第2009126890号パンフレットに記載される)ような標準的方法に従って、ベータカロテンを産生している構築されたゲラニルゲラニルシンターゼ、フィトエンシンターゼ、リコペンシンターゼ、リコペンシクラーゼなどの酵素をコードする異種遺伝子で形質転換される。本明細書で定義されるATF酵素を導入すること、及び/又は過剰発現させることにより、特に少なくとも60%のトランス-アイソフォームを有する酢酸レチニルの産生に関して同様の結果が得られる。さらに、ベータカロテンオキシダーゼ遺伝子で形質転換される場合、レチナールを産生することができる。さらに、レチノールデヒドロゲナーゼで形質転換されると、レチノールを産生することができる。任意選択的に、内在性レチノールアシル化遺伝子を欠失させることができる。このアプローチを用いて、トランス-アイソフォームに対する特異性、又は酢酸レチニルに対する生産性に関して同様の結果が得られる。
Claims (7)
- アセチルトランスフェラーゼ1[EC2.3.1.84]活性を有する異種酵素を含みかつ発現するレチノール産生宿主細胞であって、前記酵素が、前記宿主細胞により産生されるレチノイド混合物中のレチノイドの総量を基準として少なくとも40%の酢酸レチニルの割合でレチノールから酢酸レチニルへの変換を触媒し、前記宿主細胞が、ヤロウイア・リポリティカであり、前記アセチルトランスフェラーゼ1が、ラカンケア・ミランティナから得られるアセチルトランスフェラーゼ1である、レチノール産生宿主細胞。
- 前記アセチルトランスフェラーゼ1が、配列番号13に従うアセチルトランスフェラーゼ1に対して少なくとも90%の同一性を有するポリペプチドから選択される、請求項1に記載のレチノール産生宿主細胞。
- トランス-レチノールのアセチル化に対する優先性のあるレチノールアセチル化活性を有する酵素を含む、請求項1又は2に記載のレチノール産生宿主細胞。
- 酢酸レチニルがさらにビタミンAに変換される、請求項1~3のいずれか一項に記載のレチノール産生宿主細胞。
- アセチルトランスフェラーゼ1[EC2.3.1.84]の酵素活性によって、酢酸レチニルを含むレチニルエステル混合物を生産するためのプロセスであって、レチノールを、前記アセチルトランスフェラーゼ1と接触させることを含み、前記レチノールの少なくとも65~90%がトランス-アイソフォームであり、請求項1~4のいずれか一項に記載のレチノール産生宿主細胞を用いる、プロセス。
- (a)アセチルトランスフェラーゼ1[EC2.3.1.84]をコードする核酸分子を、請求項1~4のいずれか一項に記載の適切なレチノール産生宿主細胞に導入するステップと、
(b)少なくとも65~90%をトランス-レチノールとしてトランス-及びシス-レチノールを含むレチノールを、シス-及びトランス-酢酸レチニルを含む酢酸レチニル混合物に酵素変換するステップと、
(c)適切な培養条件下で酢酸レチニルをビタミンAに変換するステップと
を含む、ビタミンAの生産プロセス。 - トランス-及びシス-酢酸レチニルを含む酢酸レチニル混合物を生産するためのアセチルトランスフェラーゼ[EC2.3.1.84]の使用であって、前記酢酸レチニルの少なくとも65~90%がトランス-アイソフォームであり、前記アセチルトランスフェラーゼが請求項1~4のいずれか一項に記載のレチノール産生宿主細胞において異種発現され、前記酢酸レチニル混合物がトランス-及びシス-レチノールを含むレチノール混合物の変換によって得られ、前記レチノールの少なくとも65~90%がトランス-アイソフォームである、使用。
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