JP2009232846A - 真菌の形質転換のためのプラスミドベクター、pCryptoRNAi - Google Patents
真菌の形質転換のためのプラスミドベクター、pCryptoRNAi Download PDFInfo
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Abstract
【解決手段】真菌での第1のシグナルタンパク質の発現を制御することができる第1のプロモーターに作動可能に連結する第1のシグナルタンパク質配列と、第2のシグナルタンパク質の発現を制御することができる第2のプロモーターに作動可能に連結する第2のシグナルタンパク質配列と、第1のシグナルタンパク質配列3’非翻訳領域に位置する目的遺伝子のクローニングサイトとを有するプラスミドであって、目的遺伝子がクローニングサイトに挿入されると、該プラスミドが、第1のシグナルタンパク質と該目的遺伝子の両方をコードするmRNAを転写することができるプラスミドからなる。
【選択図】なし
Description
配列番号1の核酸配列を含むpCryptoRNAiプラスミドは次のようにして調製した。Electromaxクローニングキット(Invitrogen Corp., Carlsbad, California)を用いて、プラスミドであるp2FP-RNAi(Evrogen, Moscow, Russia)(配列番号2)を大腸菌DH5α細胞にクローニングし、製造業者の取扱説明書に従って電気穿孔法で形質転換した。細菌のコロニーを10μl/mlのカナマイシンを含むLB培地で一晩増殖させた。プラスミドDNAの単離をアルカリ溶解法を用いて行った(Sambrook, Joseph, Russell, David W., "Protocol 2: Preparation of plasmid DNA by Alkaline Lysis with SDS: Minipreparation", Molecular Cloning: A laboratory Manual, Third edition, Cold Spring Harbor Laboratory Press, 2001, pages 1.35 - 1.37)。次いで、プラスミドDNAをBgl2で消化し、直鎖DNA分子を産生した。Bgl2で消化したプラスミドを、0.02μl/mlのエチジウムブロミド(ethidium bromide)を含有する0.8%のアガロースゲルで電気泳動し、UV-トランスイルミネーター(transiluminator)下で視覚化した。ちょうど5.8kbpに断片が観察された。
1. p2FP-RNAiの2つのCMVプロモーター(PCMV IE)をPCR融合により置換するために、プラスミドを半分に切断して、融合したDNA断片が塩基相補性によりずれるのを防ぐ場合がある。その結果、互いに干渉し合う相同性配列を用いない独立反応で2つのCMVプロモーターを、例えば、2つのPactプロモーターに置換することができる。
2. 正しいDNA配列と結合した断片だけがKAN/NEO耐性遺伝子を再構築し(大腸菌では)カナマイシンおよび(クリプトコッカスでは)G418で選択することができる耐性形質型が生じるようにKAN遺伝子を破壊するため。
全長KAN配列はKAN配列にしかない単一の制限部位を欠いているので、Kanタンパク質の機能を変えないように制限部位を導入する必要があった。一塩基を変える(CTG→CTT)ことによってアミノ酸コドン(Leu)は同じだが、制限部位は、プラスミド配列の中で唯一のAfl2に変更することができる。
クリプトコッカスでのRNAi研究のための分子ツールとしての効果についてpCryptoRNAiプラスミドベクターを試験した。試験にはpCrypto-RNAiプラスミドにクローニングしたクリプトコッカスネオフォルマンス ホスホリボシルアミノイミダゾールカルボキシラーゼ(phosphoribosyl aminoimidazole carboxylase)(ADE2)遺伝子をROIパリンドローム配列としてコードしている(図3に例として示した)構築物を用いた。ADE2遺伝子の発現は視覚的な色検定、および図10の参照により、モニターすることができる。ホスホリボシルアミノイミダゾールが蓄積されたためピンクに見える細胞が観察された。
Claims (13)
- 配列番号1の核酸配列を有する核酸。
- 真菌での第1のシグナルタンパク質の発現を制御することができる第1のプロモーターに作動可能に連結する第1のシグナルタンパク質配列と、
真菌での第2のシグナルタンパク質の発現を制御することができる第2のプロモーターに作動可能に連結する第2のシグナルタンパク質配列と、
前記第1のシグナルタンパク質配列の3'非翻訳領域に位置する目的遺伝子のクローニングサイトと、
を有するプラスミドであって、
目的遺伝子が前記クローニングサイトに挿入されると、該プラスミドが、前記第1のシグナルタンパク質と該目的遺伝子の両方をコードするmRNAを転写することができる、プラスミド。 - 配列番号1の核酸配列を有する、請求項2に記載のプラスミド。
- 前記クローニングサイトに挿入される目的遺伝子をさらに有する、請求項2に記載のプラスミド。
- 前記目的遺伝子が、RNA依存型誘導サイレンシング複合体(RISC)を活性化する能力を有する二重鎖RNA配列を含む、請求項4に記載のプラスミド。
- 請求項2に記載の前記プラスミドを有する形質転換された真菌。
- 前記プラスミドが、前記真菌のゲノムに安定に取り込まれる、請求項6に記載の形質転換された真菌。
- 請求項1に記載の前記核酸を有する、ベクター。
- 請求項2に記載の前記プラスミドを前記真菌のゲノムに導入する、真菌を形質転換する方法。
- 請求項4に記載の前記プラスミドで真菌を形質転換すること、及び
1つ又は複数の前記第1のシグナルタンパク質と前記第2のシグナルタンパク質の有無を検出すること、
を含む、真菌でのRNA干渉効果の評価方法。 - 前記1つ又は複数のシグナルタンパク質が、緑色蛍光タンパク質、赤色蛍光タンパク質、黄色蛍光タンパク質、シアン蛍光タンパク質、オレンジ蛍光タンパク質、又は近赤外蛍光タンパク質である、請求項10に記載の方法。
- 真菌細胞の組成物と、
請求項4に記載の前記プラスミドと、
画像装置と、
を有する、真菌内でのRNA干渉効果を測定するインビボ(in vivo)評価システム。 - 前記真菌がクリプロコッカスである、請求項12に記載のインビボ(in vivo)評価システム。
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