JP2008283974A - コンドロイチンシンターゼをコードする核酸セグメント、同セグメントなる組換えベクター、同ベクターからなる組換え宿主細胞、および、同宿主細胞を利用して、コンドロイチンポリマーを生産するための方法 - Google Patents
コンドロイチンシンターゼをコードする核酸セグメント、同セグメントなる組換えベクター、同ベクターからなる組換え宿主細胞、および、同宿主細胞を利用して、コンドロイチンポリマーを生産するための方法 Download PDFInfo
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Abstract
【解決手段】酵素的に活性な細菌ムルトシダ(bacterial multocida)ヒアルロン酸シンターゼ(PmHAS)をコードするコード領域セグメントを有する核酸セグメント、及びヒアルロン酸シンターゼとそのヒアルロン酸産物を産生する組換え細胞の調製におけるこの核酸セグメントの使用。ワクチン接種において使用するためのP.ムルトシダの「ノックアウト」突然変異菌株を構築する上でのPmHASの使用。家畜のP.ムルトシダ感染の圃場検査での診断試験におけるPmHASの使用。
【選択図】なし
Description
本発明は、1998年4月2日に提出された「パスツレラ・ムルトシダ(PASTURELLA MULTOCIDA)から得られる特徴的なヒアルロナンシンターゼ」と題される、全体的にここに参照して直ちに組込まれる米国仮特許出願第60/080,414号に関連する。本発明は、1998年10月26日に提出された「ヒアルロナンシンターゼ遺伝子およびその使用」と題される、全体的にここに参照して直ちに組込まれる米国仮特許出願第09/178,851号に対する一部継続でもある。
1.発明の分野
本発明は、パスツレラ・ムルトシダ(Pasturella multocida)から得られるヒアルロナンシンターゼをコードするDNA配列に関する。さらに詳細には、本発明は、外来宿主中でヒアルロナンシンターゼを発現することができるように、組換え構築にかける能力のあるパスツレラ・ムルトシダ(Pasturella multocida)から得られるヒアルロナンシンターゼをコードするDNA配列に関する。本発明は、(1)変化するサイズ分布のヒアルロナンポリマーを作り、(2)置換基または付加塩基糖を組込むヒアルロナンポリマーを作り、(3)新しくそして新規な動物ワクチンを開発し、そして(4)動物の病原体の検出および同定のための新しくそして新規な診断用試験を開発するために、パスツレラ・ムルトシダから得られるヒアルロナンシンターゼをコードするDNA配列を使用する方法にも関する。
多糖ヒアルロン酸(「HA」)またはヒアルロナンは、構造的そして認識の両方の役割を果たす高等動物の必須成分である。哺乳類および鳥類では、HAは、皮膚、関節滑膜液、および眼球の硝子体液に多量に存在する。ある種の病原性細菌、特にグラム陽性AおよびC群のストレプトコッカス(Streptococcus)およびグラム陰性のパステレラ・ムルトシダA型は、それらの脊椎動物宿主で見られるHA分子と同じ化学構造を示すHAを含む細胞外莢膜を生じる。この「分子擬態」は、被包多糖に対する強力な抗体応答をさせる試みを阻止する。対照的に、他の細菌によって産生される様々な構造を示す莢膜多糖は、しばしば非常に抗原性がある。HA莢膜も、病原体が貧食作用を含む宿主防御をかわすのを明らかに助ける。
本発明は、HAを産生する新規HASに関する。種々の分子生物学の技術を使用して、新規HASについての遺伝子は、家禽コレラ病原体A型P.ムルトシダで見出された。パスツレラ.ムルトシダから得られるこの新規HAS(「PmHAS」)を、クローン化し、そして他の種の細菌で機能性があることが示された。
本発明の少なくとも1つの実施形態を詳細に説明する前に、本発明は、その用途について、以下の説明で規定されるか、または図面で例示される構成要素の構築および配列の詳細に限定されないと理解されるべきである。本発明は、他の実施形態、または種々の方法で実施または行う能力がある。さらに、ここに使用される言い回しおよび用語が、説明の目的のものであって、限定として考慮されるべきでないことも理解すべきである。
Tn916挿入突然変異誘発およびプローブ発生を最初に完了した。Tn916を使用して、破壊し、そしてP.ムルトシダのHA生合成遺伝子座をタグ付けした。非複製プラスミドpAM150上のTn構成要素を、電気穿孔法によって野生型被包P.ムルトシダ株(ATCC番号15742号)に導入した。改変コロニー形態を、斜め照射での黙視試験によって最初にスクリーニングした。野生型株は、虹色(赤色と緑色の色合い)を表す大型ムコイド(「湿潤」外観)コロニーを形成する。同様に、虹色を欠く「乾燥剤」コロニーを選択し、そして画線接種した。墨汁染色および光顕微鏡を第二のスクリーンとして使用して、被包の状態を評価した。突然変異染色体中のTn構成要素の位置を、サザン分析によってマッピングした。
タンパク質は、ウシの血清アルブミン鎖を利用するクマシン染料結合アッセイによって測定した。多くのムコシドコロニーを形成する非常に毒性のある七面鳥株である、P.ムルトシダ野生型(アメリカン・タイプ・カルチャー・コレクション15742)を、摂氏37度で、好気性条件下で、脳/心臓融合培養基で維持した。TnAと称される、小さな「乾燥剤」コロニーを形成したその株の非莢膜突然変異体は、ここに記述される新たに記述されたTn916挿入物の突然変異誘発法によって生成される。
PmHASのDNA配列も、破壊バージョンを用いた相同な組換えによって、正常な微生物遺伝子をノックアウトした後、P.ムルトシダ細菌の潜在的に弱毒化したワクチン株を生成するのに使用することができる。さらに、PmHASのDNA配列は、家禽、家畜、ヒツジおよびブタの農業病原体である関連P.ムルトシダ型についてのプローブの型を決める診断用細菌の生成を可能にする。
生体内実験の結果は、表IIIに要約される。
本発明は、その分野でA、DおよびF型P.ムルトシダまたはピー.ヘモリチカの同定を促進する有用なプローブの産生にも関する。特定の株が、動物に存在するという診断は、最近、制限分析の後、血液学、凝集またはDNAフィンガープリンティングによって決定される。先の2つの方法は、問題が多く、頻繁に誤った同定を生じ、そして抗血清をタイプ分けする源によって変化する。カーター型A、DおよびF型の莢膜血液学は、これらのポリマーが、免疫原がこのように乏しいので抗体さえ使用しない。実際に、酵素的消化またはアクリフラビンとの細胞凝集に関与する困難なアッセイを、日常的に使用する。DNAフィンガープリンティングは、正確であるが、しかし、それは、ファイル上の莫大な型の株の集約的知識に依存する。莢膜特異的プライマーの組は、特に、最小限の取扱いで、そして予備培養なしに、半日で病原性単離物を同定する迅速で容易なPCR分析を使用することによって、これらの疫学的研究を十分に行うのに使用される。一旦、病原体が同定されると、抗生物質またはワクチンの選択に、いっそう洗練された決定をなすことができる。
Claims (6)
- 酵素的に活性なコンドロイチンシンターゼをコードする精製・分離された核酸セグメントであって、前記コンドロイチンシンターゼは、コンドロイチン分子を形成するための、UDP−GlcAおよびUDP−GlcNAcの双方の組込みを触媒するタンパク質であり、精製・分離された前記核酸セグメントは、下記(a)項から(d)項:
(a)配列番号3のアミノ酸配列をコードする核酸セグメント;
(b)80%から99%の、(a)と同一のヌクレオチドを有する核酸セグメント;
(c)40から50℃で、1.2−1.8×HPBのハイブリッド形成条件において、(a)の相補的鎖でハイブリッド形成する核酸セグメント;および、
(d)遺伝子コードの縮重、または、機能的に等価なアミノ酸をコードするために、40から50℃で、1.2−1.8×HPBのハイブリッド形成条件において、(a)の相補的鎖でハイブリッド形成する核酸セグメント
のうちの何れか1つであることを特徴とする核酸セグメント。 - 請求項1に記載した核酸セグメントからなる組換えベクター。
- コンドロイチンを生成する、請求項2に記載した組換えベクターからなる組換え宿主細胞。
- (a)請求項3に記載した宿主細胞を培地で増殖させて、コンドロイチンを分泌させるステップと;
(b)前記コンドロイチンを回収するステップと
を含む、コンドロイチンポリマーを生産するための方法。 - 酵素的に活性なコンドロイチンシンターゼを、反応混合物中のUDP−GlcAおよびUDP−GlcNAcと反応させて、コンドロイチンを生成させるステップを含む、生体外で、コンドロイチンポリマーを生産するための方法において、前記酵素的に活性なコンドロイチンシンターゼが、請求項1に記載した核酸セグメントによってコードされることを特徴とする方法。
- 前記コンドロイチンを回収するステップを更に含む、請求項5に記載の方法。
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CA2326821A1 (en) | 1999-10-14 |
EP1832662B1 (en) | 2011-03-09 |
CN1304317A (zh) | 2001-07-18 |
EP1832662A2 (en) | 2007-09-12 |
JP4490581B2 (ja) | 2010-06-30 |
EP1073460A1 (en) | 2001-02-07 |
JP2002510648A (ja) | 2002-04-09 |
CZ20003576A3 (cs) | 2001-09-12 |
CN101275143A (zh) | 2008-10-01 |
JP4887333B2 (ja) | 2012-02-29 |
DE69943276D1 (de) | 2011-04-21 |
AU770903B2 (en) | 2004-03-04 |
AU3548599A (en) | 1999-10-25 |
CN1327894C (zh) | 2007-07-25 |
ATE501275T1 (de) | 2011-03-15 |
WO1999051265A1 (en) | 1999-10-14 |
EP1073460A4 (en) | 2001-05-23 |
IL138803A0 (en) | 2001-10-31 |
WO1999051265A9 (en) | 2000-04-13 |
CA2326821C (en) | 2010-09-28 |
EP1832662A3 (en) | 2007-11-07 |
BR9909346A (pt) | 2001-09-11 |
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