JP6589605B2 - 強光に耐性を示す緑藻突然変異体及びその利用 - Google Patents
強光に耐性を示す緑藻突然変異体及びその利用 Download PDFInfo
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Description
(1)N-末端にResponse regulatoryドメインを有し、且つC-末端にWD40ドメインを有するタンパク質(以下RR-WDタンパク質と呼ぶ)の機能又は発現が野生株より低下した緑藻突然変異体であって、PAR(Photosynthetically Active Radiation)で表した光強度が1,000、1,500又は2,000 μmol photons m-2 s-1のいずれかで培養した時、野生株よりも速い増殖を示す、前記緑藻突然変異体。
(2)野生株のRR-WDタンパク質とは異なるアミノ酸配列を有するRR-WDタンパク質を合成する、(1)記載の緑藻突然変異体。
(3)RR-WDタンパク質をコードする遺伝子の発現を低下させることで、RR-WDタンパク質の機能を低下させた、(1)記載の緑藻突然変異体。
(4)RR-WDタンパク質をコードする遺伝子の翻訳効率を低下させることで、RR-WDタンパク質の活性を低下させた、(1)記載の緑藻突然変異体。
(5)トレボキシア藻網に属する、(1)〜(4)のいずれか1記載の緑藻突然変異体。
(6)シュードコッコミクサ(Pseudococcomyxa)属に属する、(5)記載の緑藻突然変異体。
(7)(1)〜(6)のいずれか1記載の緑藻突然変異体を培養する工程を含む、脂質生産方法。
(1) RR-WDタンパク質コード遺伝子配列を置換し、アミノ酸配列の一部が置換した、野生株のRR-WDタンパク質とは異なるアミノ酸配列を有するRR-WDタンパク質を合成させる;
(2) RR-WDタンパク質コード遺伝子の転写を抑制し、該遺伝子の発現を低下させる;
(3) RR-WDタンパク質コード遺伝子の翻訳を抑制し、該遺伝子の翻訳効率を低下させる;
方法が挙げられる。
本発明において、RR-WDタンパク質コード遺伝子配列に置換を持つ緑藻突然変異体とは、本来的には対立遺伝子、同義遺伝子等の複数のRR-WDタンパク質コード遺伝子を有するが、これらのうち少なくとも1つ又は複数のRR-WDタンパク質コード遺伝子の配列を置換した緑藻突然変異体を意味する。
RR-WDタンパク質コード遺伝子の転写を抑制する方法としては、対象となる緑藻における該遺伝子の転写プロモーター領域に変異を導入する方法が挙げられる。
RR-WDタンパク質コード遺伝子の翻訳を抑制する方法としては、いわゆるRNA干渉法(Cerutti H et al., 2011, Eukaryot Cell, 10, 1164)が挙げられる。
培養後、例えば培養物からヘキサン抽出等によって、脂質を得ることができる。
MA5培地(Imamura et al., 2012, J Gen Appl Microbiol, 58, 1)で培養したObi株を遠心して細胞を回収し、クエン酸緩衝液(pH6.0)に懸濁した。この懸濁液に、突然変異誘起剤であるNTG(1-methyl-3-nitro-1-nitrosoguanidine)を500 μg/ml加え、1時間、緩やかに攪拌した。この処理後、処理した細胞をMA5培地で1週間、1% (v/v) CO2をバブリングさせながら、蛍光灯下、PAR光強度で50 μmol photons photons m-2 s-1(以下光強度はすべてPAR値で示す)で培養した。その後、細胞をMA5固形寒天培地上に108 cells/plateで塗布し、LED(455 nm、660 nm)を光源とし、強光(2000 μmol photons m-2 s-1)下で2週間、培養した。その後、この寒天培地を蛍光灯下(50 μmol photons m-2 s-1)に移し、さらに1週間培養した。このようにして、強光下での生存性の高いと思われる株を4株単離し、HL6株、HL7株、HL9株、HL13株と命名した。
HL6株、HL7株、HL9株およびHL13株を、MA5培地でOD750 = 0.1に合わせ、2,000 μmol photons m-2 s-1の光強度下、1% (v/v) CO2をバブリングさせながら培養を行った。野生株であるObi株の生育は強光下で阻害されたが、分離した変異株はいずれも生育可能であった。HL6株について、200および2,000 μmol photons m-2 s-1の光強度における培養を定量的に評価した。200 μmol photons m-2 s-1の条件下ではObi株およびHL6株において生育の差は見られなかった。一方、2,000 μmol photons m-2 s-1においてはHL6株のみ生育可能であった(図1)。
分離した強光耐性変異株HL6とその親株であるObi株とを、3つの異なる光強度下で培養した。使用した培地は、DENSO培地[2.38 mM (NH2)2CO, 863 μM (NH4)2SO4, 405 μM MgSO4, 265 μM KH2PO4, 264 μM K2HPO4, 61.2 μM CaCl2, 1.20 μM CuSO4, 1.13 μM H3BO3, 1.04 μM ZnSO4, 0.622 μM MnSO4, 0.294 μM CoCl2, 12.4 nM Na2MoO4, 0.4% (v/v) Fe solution (3 g/L citric acid, 4.9 g/L ammonium ferric citrate, 0.5 g/L EDTA-2Na)]を2倍希釈した1/2 DENSO培地である。培養開始時の細胞密度はOD750 = 0.5とし、光強度は200、1,000、1,500 μmol photons m-2 s-1であった。その後、培養6日目および12日目でサンプリングを行った。Obi株は光強度の上昇とともにその生育および脂質蓄積量が減少した。HL6株においても増殖、脂質蓄積量の減少は見られるものの、その程度はObi株と比べ有意に抑えられていた。200 μmol photons m-2 s-1ではObi株の方が脂質生産性は高いが、1,000 μmol photons m-2 s-1を超える光条件下ではいずれの時点においてもHL6株の方が上回っていた(図2)。
Obi株およびHL6株を、蛍光灯下(50 μmol photons m-2 s-1)、MA5培地中で一週間培養し、MA5培地にOD750 = 1.0に希釈した後、LED照射下(2,000 μmol photons m-2 s-1)で培養した。照射開始後、所定の時間ごとに光合成活性(酸素発生速度)を酸素電極で測定した。Obi株では照射時間が増すに従い光合成活性の低下がみられ、1 時間照射後では開始時のおよそ25%にまで低下した。一方、HL6では、同様の条件下で65%の光合成活性を保っていた(図3)。
Dual-PAM-100 (Waltz, Germany)という装置を用いてクロロフィル蛍光測定することにより、NPQの大きさを評価することができる。蛍光灯下(50 μmol photons m-2 s-1)、一週間培養したObi株およびHL6株細胞を、クロロフィル濃度が10 μg chl/mlになるように5 mM NaHCO3を含んだMA5培地に懸濁した。測定開始前に5分間の暗所順応を行い、その後、ごく弱い測定光をパルス照射し、そのパルスに応答した蛍光量の変化を計測した。
NPQを形成する成分の一つとしてキサントフィルサイクル(xanthophyll cycle)が挙げられる。キサントフィルサイクルとは、アンテナ色素の補助色素である3種類のキサントフィル類が、相互変換する反応である。3種類のキサントフィルのうち最も熱放散効率の低いビオラキサンチン(Violaxanthin)は二つのエポキシ環を持つが、デエポキシダーゼ(de-epoxidase)によって次に熱放散効率が低いアンテラキサンチン(Antheraxanthin)に変換され、さらに最も熱放散効率の高いゼアキサンチン(Zeaxanthin)に変換される(脱エポキシ化)。デエポキシダーゼはチラコイド膜内側のルーメンに存在し、至適pHは5.0である。強光下では、前に述べた理由でルーメンのpHが酸性となり、熱放散効率の高いゼアキサンチンが蓄積される。一方、弱光下では、この反応は抑制され、逆に、チラコイド膜外側のストロマにあるエポキシダーゼによって、熱放散効率の低いビオラキサンチンが蓄積される。このキサントフィルサイクルの作動がObi株とHL6株との間で差があるかを検討した。
Obi株を1,000 μmol photons m-2 s-1の光強度で2日間培養し、その細胞を用いて、NPQの大きさを測定した。弱い光で培養したObi株細胞のNPQ(図4)と異なり、強光に馴化したObi株細胞のNPQは、同じく1,000 μmol photons m-2 s-1の光強度で2日間培養したHL6株に近い大きさであった(図6)。このことから、Obi株を強光で育てた時に誘導されるNPQ機構があり、HL6株ではこの機構が常に発現し作動していると結論した。クラミドモナスの研究から、この機構とはLHCSRであると考えられる。
強光耐性を示すObi株由来の突然変異体であるHL6株、HL7株、HL9株、HL13株、計4株のゲノム塩基配列をIllumina HiSeq 2000あるいはApplied Biosystems 3730xl DNA analyzerで決定し、変異解析を行った。HL6株のLRS2遺伝子では、コーディング領域(CDS)の213および214番目の2塩基(CとT)が欠失し、その結果、72番目のアミノ酸であるロイシン(L)以降でフレームシフト突然変異が起こっていた(c.213_214delCT, p.L72fs)。HL7株では、CDSの131番目で塩基置換(C→A)が起こり、その結果44番目のアミノ段であるセリン(S)がストップコドンに変化していた(c.131C>A, p.S44X)。HL9株では、CDSの129および130番目の2塩基(GとT)が欠失し、その結果、44番目のアミノ酸であるセリン(S)以降でフレームシフト突然変異が起こっていた(c.129_130delGT, p.S44fs)。HL13株では、第2エキソンの末端に位置する255番目の塩基の次の塩基(第2イントロンの最初の塩基)で塩基置換(G→A)が起こり、その結果正常なスプライシングができなくなったと考えられた(c.255+1G>A)(図7)。
FERM BP-22299
Claims (7)
- N-末端にResponse regulatoryドメインを有し、且つC-末端にWD40ドメインを有するタンパク質の機能又は発現が野生株より低下した緑藻突然変異体であって、
前記タンパク質が、配列番号3に示すアミノ酸配列と少なくとも90%の配列同一性を有するアミノ酸配列から成り、且つユビキチン転移酵素の構成成分としての機能を有するタンパク質であり、
PAR(Photosynthetically Active Radiation)で表した光強度が1,000、1,500又は2,000 μmol photons m-2 s-1のいずれかで培養した時、野生株よりも速い増殖を示す、前記緑藻突然変異体。 - 野生株の前記タンパク質とは異なるアミノ酸配列を有する前記タンパク質を合成する、請求項1記載の緑藻突然変異体。
- 前記タンパク質をコードする遺伝子の発現を低下させることで、前記タンパク質の機能を低下させた、請求項1記載の緑藻突然変異体。
- 前記タンパク質をコードする遺伝子の翻訳効率を低下させることで、前記タンパク質の活性を低下させた、請求項1記載の緑藻突然変異体。
- トレボキシア藻網に属する、請求項1〜4のいずれか1項記載の緑藻突然変異体。
- シュードコッコミクサ(Pseudococcomyxa)属に属する、請求項5記載の緑藻突然変異体。
- 請求項1〜6のいずれか1項記載の緑藻突然変異体を培養する工程を含む、脂質生産方法。
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