JP2019532660A - 温度に基づくプラスミド調節系 - Google Patents
温度に基づくプラスミド調節系 Download PDFInfo
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- JP2019532660A JP2019532660A JP2019522789A JP2019522789A JP2019532660A JP 2019532660 A JP2019532660 A JP 2019532660A JP 2019522789 A JP2019522789 A JP 2019522789A JP 2019522789 A JP2019522789 A JP 2019522789A JP 2019532660 A JP2019532660 A JP 2019532660A
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Abstract
Description
- 前記組換え大腸菌細胞が、その発現が前記必須大腸菌遺伝子とは天然では関連していない上流リーダー配列によって調節される、ゲノムにコードされている必須大腸菌遺伝子を含んでおり、前記上流リーダー配列が、第1の温度では成長を実質的に許容しないが第2の温度では成長を許容する熱スイッチとなる機能を有しており、
- 前記組換えプラスミドが、前記大腸菌細胞によってゲノムにコードされている前記必須大腸菌遺伝子と同じ又は実質的に同じ機能を有するタンパク質をコードしている必須大腸菌遺伝子を含んでおり、したがって両方の温度での成長を許容する、方法を提供する。
- 前記組換え大腸菌細胞が、その発現が前記必須大腸菌遺伝子とは天然では関連していない上流リーダー配列によって調節される、ゲノムにコードされている必須大腸菌遺伝子を含んでおり、前記上流リーダー配列が、第1の温度では成長を実質的に許容しないが第2の温度では成長を許容する熱スイッチとなる機能を有しており、
- 前記組換えプラスミドが、前記大腸菌細胞によってゲノムにコードされている前記必須大腸菌遺伝子と同じ又は実質的に同じ機能を有するタンパク質をコードしている必須大腸菌遺伝子を含んでおり、したがって両方の温度での成長を許容する、方法を提供する。
- 前記組換え大腸菌細胞が、その発現が前記必須大腸菌遺伝子とは天然では関連していない上流リーダー配列によって調節される、ゲノムにコードされている必須大腸菌遺伝子を含んでおり、前記上流リーダー配列が、第1の温度では成長を実質的に許容しないが第2の温度では成長を許容する熱スイッチとなる機能を有しており、
- 前記組換えプラスミドが、前記大腸菌細胞によってゲノムにコードされている前記必須大腸菌遺伝子と同じ又は実質的に同じ機能を有するタンパク質をコードしている必須大腸菌遺伝子を含んでおり、したがって両方の温度での成長を許容する、方法。
pVAX1カナマイシン耐性選択マーカーを利用した以前のプラスミド変異体による汚染を防止するために、1つのICCバイアルを2回こすり、カナマイシン又はナリジクス酸を含有する動物質非含有LB寒天プレートを別々に接種するために使用した。プレートを検査の前に37℃で17時間インキュベートした。カナマイシンプレートでは成長は観察されず、分析を混乱させる親pVAX1ベクターが存在しなかったことが示された。
infA相補系を用いたプラスミド保持の検証。
infAに基づくプラスミド保持選択系が所望通り機能したことを検証するために、プラスミドで形質転換させた細菌を100継代まで成長させた(1継代あたりおよそ36回の倍化/世代、合計3,600世代の潜在的なドリフト又はプラスミド損失を検査した)。1〜100継代を1週間に11継代、すなわち平日に37℃で2継代及び各週末に30℃で1継代で作製した。すべてを15マイクログラム/mlのナリジクス酸を添加した液体の動物質非含有LB培地(Teknova社soy-tone)中で行った(プラスミドの存在ではなく、DH5α基本株について選択)。グリセロールストックをそれぞれの継代から作製し、同時処理するために100継代すべてが得られるまで保持した。
infA相補系を用いたスケールアップの適切性。
infAに基づくプラスミド保持選択系が生産規模で所望通り機能したことを検証するため、特定の収率増強温度シフト工程を用いて、プラスミドで形質転換させた細菌を50Lのパイロット流加発酵槽の実行において使用した。酵母抽出物を添加した最少培地を利用して、倍加速度を0.88/時間まで減らした。流加は接種の17h00後に開始し、30%での溶存酸素の調節はpO2カスケードパラメータの逐次的な増加によって実現した(32h15で撹拌、40h30で加圧、その後、45h40で空気流)。予測どおり、バイオマス増加速度は42℃へのシフト直後に下がった。産生されたプラスミドDNAの量は、即時の溶解後収率を模倣した小スケールプラスミド抽出手順を使用して1.03±0.17g/Lと推定された。
Claims (15)
- ゲノムにコードされている必須大腸菌遺伝子を含む組換え大腸菌(E. coli)細胞であって、発現が、前記必須大腸菌遺伝子とは天然では関連していない上流リーダー配列によって調節され、前記上流リーダー配列が、第1の温度では成長を実質的に許容しないが第2の温度では成長を許容する熱スイッチとなる機能を有する、組換え大腸菌細胞。
- ゲノムにコードされている必須大腸菌遺伝子を含む組換え大腸菌細胞であって、発現が、前記必須大腸菌遺伝子とは天然では関連していない上流リーダー配列によって調節され、前記上流リーダー配列が、天然の遺伝子相補性なしに、第1の温度では成長を実質的に許容しないが第2の温度では成長を許容する熱スイッチとなる機能を有する、組換え大腸菌細胞。
- 前記組換え大腸菌細胞が、ゲノムにコードされている前記必須大腸菌遺伝子のさらなるバージョンを含まない、請求項1又は2に記載の組換え大腸菌細胞。
- 前記大腸菌細胞によってゲノムにコードされている前記必須大腸菌遺伝子と同じ又は実質的に同じ機能を有するタンパク質をコードしている必須大腸菌遺伝子をコードしているプラスミドを含む、請求項1〜3のいずれか一項に記載の組換え大腸菌細胞。
- 前記プラスミドによってコードされている前記必須大腸菌遺伝子が、前記ゲノムにコードされている必須大腸菌遺伝子よりも前記組換え大腸菌細胞中で高い活性を有する遺伝子産物をコードしている、請求項4に記載の組換え大腸菌細胞。
- 前記上流リーダー配列が、リステリア菌(L. monocytogenes)prfA又はその機能的均等物に由来するmRNAリーダー配列を含む、請求項1〜5のいずれか一項に記載の組換え大腸菌細胞。
- 前記必須大腸菌遺伝子が、転写又は翻訳に関与しているタンパク質をコードしている、請求項1〜6のいずれか一項に記載の組換え大腸菌細胞。
- 前記ゲノムにコードされている必須大腸菌遺伝子がinfA又はその機能的均等物である、請求項1〜7のいずれか一項に記載の組換え大腸菌細胞。
- 前記infA又はその機能的均等物から発現されたタンパク質が、天然の大腸菌infAによってコードされているタンパク質(IF1)よりも低い活性を有する、請求項8に記載の組換え大腸菌細胞。
- 前記プラスミドによってコードされている前記必須大腸菌遺伝子が天然の大腸菌infAである、請求項5〜9のいずれか一項に記載の組換え大腸菌細胞。
- 成長を許容する温度での前記大腸菌細胞の成長速度は、前記必須大腸菌遺伝子が、プラスミドから主に発現されている場合、前記ゲノムにコードされている必須大腸菌遺伝子から主に又はそれのみから発現されている場合よりも速い、請求項5〜10のいずれか一項に記載の組換え大腸菌細胞。
- 前記第1の温度が前記第2の温度よりも低い、請求項1〜11のいずれか一項に記載の組換え大腸菌細胞。
- 前記第1の温度と前記第2の温度との差が少なくとも約1℃、少なくとも約2℃、少なくとも約5℃、又は少なくとも約7℃である、請求項1〜12のいずれか一項に記載の組換え大腸菌細胞。
- 組換えプラスミドを組換え大腸菌細胞内に挿入する工程を含む、組換え大腸菌中にプラスミドを維持する方法であって、
- 前記組換え大腸菌細胞が、ゲノムにコードされている必須大腸菌遺伝子を含んでおり、その発現が前記必須大腸菌遺伝子とは天然では関連していない上流リーダー配列によって調節され、前記上流リーダー配列が、第1の温度では成長を実質的に許容しないが第2の温度では成長を許容する熱スイッチとなる機能を有しており、
- 前記組換えプラスミドが、前記大腸菌細胞によってゲノムにコードされている前記必須大腸菌遺伝子と同じ又は実質的に同じ機能を有するタンパク質をコードしている必須大腸菌遺伝子を含んでおり、したがって両方の温度での成長を許容する、
方法。 - 前記組換え大腸菌細胞が請求項4〜13のいずれか一項に記載したものである、請求項14に記載の方法。
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