JP2014524235A - アグロシベ・アエゲリタのレクチンaal−2、及びそのコード遺伝子、その調製方法、及び応用 - Google Patents
アグロシベ・アエゲリタのレクチンaal−2、及びそのコード遺伝子、その調製方法、及び応用 Download PDFInfo
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Abstract
Description
また、本発明は、アグロシベ・アエゲリタから上記のレクチンを分離、又は、調製する方法を提供することを目的とする。
また、本発明は、上記の分離されたアグロシベ・アエゲリタのレクチンをコードするcDNAを提供することを目的とする。
また、本発明は、上記のアグロシベ・アエゲリタのレクチンの、及びそのコード遺伝子の、薬理学的応用を提供することを目的とする。
(b)SEQ ID NO:2で表されるアミノ酸配列において1つ若しくは複数のアミノ酸残基が置換、欠失又は/及び付加されている、アグロシベ・アエゲリタ(Agrocybe aegerita)のレクチンAALの機能を有するポリペプチド変異体である。
本発明のその他の目的は、レクチンAAL−2をコードするヌクレオチド配列を提供することである。
(a)SEQ ID NO:1で表されるヌクレオチド配列;又は
実施例1 アグロシベ・アエゲリタのレクチンAAL−2タンパク質の調製
(1)アグロシベ・アエゲリタの全タンパク質の調製
干したアグロシベ・アエゲリタの子実体(福建三明真菌研究所から入手)を取り、粉砕機で粉末まで粉砕し、1:10 (w/v)の割合で再蒸留水を入れ、浸した。計3回、1回毎に4時間又は一晩浸した。それぞれ、1回毎に浸した上澄みを取り、80%まで過硫酸アンモニウムを入れ、一晩置いた。遠心(10、000 rpm/min、20 min)して、沈殿を集め、沈殿を適当量の再蒸留水に溶かし、透析して塩を除去し、凍結乾燥してアグロシベ・アエゲリタの全タンパク質を得た。
400 mgのアグロシベ・アエゲリタの全タンパク質を取り、90mLのPBS緩衝液に溶かし、遠心して変性タンパク質を除去した。上澄みを取り、親和性クロマトグラフィー用カラムを通せた。N−アセチルグルコサミンがカップリングしたSepharose 6Bを親和性クロマトグラフィー用カラムとした。PBS緩衝液でバランスした後、上記のアグロシベ・アエゲリタの全タンパク質の上澄みの親和性クロマトグラフィーィーを行いた。ローディング完了した後、紫外線検出器により不純物タンパク質の流出の検出ができなくなるまで親和性コラムをPBS緩衝液で洗浄し、0.2 mol/LのN−アセチルグルコサミンのPBS緩衝液で溶出し、流し出されたタンパク質を集めて、アグロシベ・アエゲリタのレクチンAAL−2を得た。
実施例1におけるSDS-PAGEにより得たAAL−2バンドを切り出し、質量分析により、ペプチド断片を6本得た。同時に、本発明では、アグロシベ・アエゲリタの菌糸及び子実体のトランスクリプトームライブラリー(NCBIコードはSRA026731である)を構築し、地元のBLASTXにより6本のペプチド断片のアミノ酸配列とトランスクリプトームライブラリーとを相同アライメントを行いた。アライメントの結果、AAL−2タンパク質のヌクレオチドコード領域が、トランスクリプトームライブラリーにおける遺伝子Unigene4198の相補鎖に位置することを見出した。オープン・リーディング・フレームの同定により、タンパク質コード領域を得た。このタンパク質コード領域により翻訳されたアミノ酸配列が、質量分析により得られたAAL−2 の6本ペプチド断片に高度にマッチ可能で(図2)、且つExPASyソフトウェアにより予測されたタンパク質分子量は、43,175kDaで、実施例1におけるSDS-PAGE結果と一致した。これにより、このコード領域はアグロシベ・アエゲリタのレクチンAAL−2のヌクレオチド配列であることを確かめにした。そのヌクレオチド配列は、SEQ ID No.1で表されるもので、質量分析同定により、コードされたアミノ酸配列は、SEQ ID No.2で表されるものである。
1.アグロシベ・アエゲリタのレクチンAAL−2の体外における肝臓癌細胞に対する致死効果
本実験においては、BALB/cマウス(6-8周齢、20克)を採用し、腋窩で、0.1mLのマウス肝臓癌細胞H22株(1×107 cells/mL )を皮下接種し、接種した後の第7日に腫瘍内アグロシベ・アエゲリタのレクチンAAL−2(実施例1により分離されたタンパク質)注射をした(5mg/kg, 0.1mL/匹)。対照では、生理食塩水を注射した。その後、1日を置いて注射し、計7回注射し、マウス腫瘍組織の寸法を記録した。腫瘍の寸法=腫瘍組織の長さL×幅W2/2である。
アグロシベ・アエゲリタのレクチンAAL−2の糖結合活性を同定するために、本実験においては、糖チップ技術を利用し、アグロシベ・アエゲリタのレクチンAAL−2を採用して、465種の糖に対して検出を行った。
Claims (10)
- アグロシベ・アエゲリタ(Agrocybe aegerita)のレクチンAAL−2において、
アミノ酸が以下の(a)又は(b)は、:
(a)SEQ ID NO:2で表されるアミノ酸配列;又は
(b)SEQ ID NO:2で表されるアミノ酸配列において1若しくは複数のアミノ酸残基が置換、欠失又は/及び付加されている、SEQ ID NO:2で表されるアミノ酸の機能を有する誘導配列、であることを特徴とするアグロシベ・アエゲリタ(Agrocybe aegerita)のレクチンAAL−2。 - 請求項1に記載のアグロシベ・アエゲリタ(Agrocybe aegerita)のレクチンAAL−2の調製方法において、
(1)アグロシベ・アエゲリタ(Agrocybe aegerita)の全タンパク質を抽出し、変性タンパク質を除去する工程;
(2)変性タンパク質が除去されたアグロシベ・アエゲリタ(Agrocybe aegerita)の全タンパク質が親和性クロマトグラフィー用カラムを通過させ、不純物タンパク質の流出がなくなるまで親和性コラムを緩衝液で洗浄する工程;
(3)親和性クロマトグラフィー用カラムを緩衝液で溶出し、流し出されたタンパク質を収集する工程;
を含むアグロシベ・アエゲリタ(Agrocybe aegerita)のレクチンAAL−2の調製方法。 - 前記親和性クロマトグラフィー用カラムは、N−アセチルグルコサミンがカップリングされたSepharose 6B親和性クロマトグラフィー用カラムであり、工程(2)に記載の緩衝液は、PBS緩衝液であり;工程(3)に記載の緩衝液は、N−アセチルグルコサミンを0.2mol/L含有する緩衝溶液であることを特徴とする請求項2に記載の方法。
- アグロシベ・アエゲリタ(Agrocybe aegerita)のレクチンAAL−2をコードするcDNAにおいて、
以下の(a)又は(b)で表されるヌクレオチドであり、
(a)SEQ ID NO:1で表されるヌクレオチド配列;又は
(b)SEQ ID NO:1で表されるヌクレオチド配列において1若しくは複数の塩基が置換、欠失又は/及び付加されているヌクレオチド変異配列であり、当該ヌクレオチド変異配列がコードするタンパク質は請求項1に記載のアグロシベ・アエゲリタのレクチンAAL−2の機能を有することを特徴とするcDNA。 - 請求項4に記載のcDNAを含有する発現ベクター。
- 請求項5に記載の発現ベクターを含有するホスト細胞。
- 腫瘍の治療のための医薬組成物において、治療的に有効量の請求項1に記載のアグロシベ・アエゲリタのレクチンAAL−2、及び、薬学的に許容されるベクターからなる、ことを特徴とする腫瘍の治療のための医薬組成物。
- 請求項1に記載のアグロシベ・アエゲリタのレクチンAAL−2、又は、請求項4に記載のcDNAの抗腫瘍薬の調製における応用。
- 請求項1に記載のアグロシベ・アエゲリタのレクチンAAL−2、又は、請求項4に記載のcDNAのN−アセチルグルコサミンに関連する病症の試薬の調製、検出における応用。
- 請求項1に記載のアグロシベ・アエゲリタのレクチンAAL−2、又は、請求項4に記載のcDNAのN−アセチルグルコサミンに関連する糖構造的試薬の調製、検出における応用。
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