JP5093578B2 - 受容体型プロテインチロシンホスファターゼPtprzによるErbB4シグナルの抑制 - Google Patents
受容体型プロテインチロシンホスファターゼPtprzによるErbB4シグナルの抑制 Download PDFInfo
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- JP5093578B2 JP5093578B2 JP2007164067A JP2007164067A JP5093578B2 JP 5093578 B2 JP5093578 B2 JP 5093578B2 JP 2007164067 A JP2007164067 A JP 2007164067A JP 2007164067 A JP2007164067 A JP 2007164067A JP 5093578 B2 JP5093578 B2 JP 5093578B2
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Description
受容体型チロシンホスファターゼPtprzの分子構造は、大きく細胞外領域、細胞膜貫通ドメイン、細胞内領域に3つに分けられる(図1)。細胞内領域には、チロシンホスファターゼドメイン(PTP)がタンデムに並んでおり、細胞内領域のカルボキシル末端はPDZドメイン含有タンパク質との結合に関与するモチーフを有している。PtprzのPTP−D2及びカルボキシル末端に対する細胞内結合分子の同定を目的として、グルタチオンSトランスフェラーゼ(GST)との融合タンパク質を設計した。市販システム(GEヘルスケア)を用いて、GSTとPtprzのD2ドメイン及びカルボキシル末端(ラットPtprz−A(GenBankアクセッション番号U09357)のアミノ酸残基2030から2316)との融合タンパク質(GST−Ptprz−D2、図1参照)を、大腸菌株BL21中で発現プラスミドpGEX-Ptrprz-D2を使って発現させ、該タンパク質を、クロマトグラフィー装置(AKTA prime plus、GE Healthcare社製)につなげたGSTrapカラムを用いたグルタチオン・アフィニティークロマトグラフィーにより精製した。pGEX-Ptprz-D2は、pZeoPTPζ(Proc. Natl. Acad. Sci. USA 98, 2001, 6593-6598)の適切なcDNAをpGEX-6P(GE Healthcare社製)にサブクローニングすることで調製した。また、GST−Ptprz−D2−SAはセリン2314がアラニンで置換された変異体である。QuickChange Multi Site-Directed Mutagenesis Kit (Stratagene社製)を用いてpGEX-Ptprz-D2から作製したpGEX-Ptprz-D2-SAから、GST−Ptprz−D2−SAを発現させた。
生体内において、ErbB4がPtprzによって脱リン酸化されているのか、野生型マウス及びPtprz遺伝子欠損マウスの脳組織サンプルを用いて検討した。野生型マウス(+/+)と、Ptprz欠損マウス(−/−)から大脳シナプトソームを調製した。可溶化液を用いて、シナプトソームにおけるチロシンリン酸化パターン全体とタンパク質発現とをウエスタンブロットで分析した。Ptprzの全てのスプライシングアイソフォームは、コンドロイチン硫酸プロテオグリカンとして発現しているため、シナプトソーム可溶成分を文献(J. Biochem. 123, 1998, 458-467)記載の通りコンドロイチナーゼABCで処理した後、Ptprz−Bを検出した。野生型及びノックアウトマウス間のシナプトソーム全タンパク質のリン酸化状態をウエスタンブロットで見る限り両者間に差異はなく(図5A左側)、シナプトソーム中のErbB4(図5A右側上段)及びPSD95(図5右側中段)の含量も同程度であった。Ptprzは野生型のみに確認された(図5A下段)。
インビトロにおけるリン酸化アッセイを次のように行った。GST−ErbB4ICR(ErbB4の細胞内領域全体)をCell signaling technology社から購入した。pGEX-6PにラットPSD95の全長cDNAを含ませたpGEX-PSD95(Brain Res. Mol. Brain Res. 72, 1999, 47-54)を用いて、GST−PSD95を大腸菌で発現させ、グルタチオン・アフィニティークロマトグラフィー(GsTrap FF)、陰イオン交換クロマトグラフィー(Hitrap Q FF)、次いでゲルクロマトグラフィー(Superose 6 10/300 GL)で精製した。自己リン酸化のために、GST−ErbB4ICR(1.25ng)を、表示した量のGST−PSD95(又はコントロールGST)を含み、5mM MgCl2、5mM MnCl2、1.25mM DTT、及び100μg/ml ウシ血清アルブミンを含む10μlの60mM HEPES(pH7.4)(PTK緩衝液)と氷上で15分、プレ・インキュベートした。5μlのATP溶液(30μCi/ml[γ−32P]ATP及び30μM非標識ATPを溶かしたPTK緩衝液)を加え、30℃で、リン酸化反応を開始させた。[γ−32P]ATP(〜6000Ci/mmol)はGE Healthcare社製を用いた。SDS−PAGEサンプルバッファーを加えることで反応を停止させた。これらのサンプルをSDS−PAGEで分離し、ゲル上のシグナルを、バイオ・イメージングアナライザー(Fuji Photo Film社製)を用いて、イメージングプレート(BAS-MS 2025)で検出した。
Claims (4)
- ヒトPtprz遺伝子を含むヒトErbB4の脱リン酸化剤。
- ヒトPtprzを発現しうる組換えベクターを含むヒトErbB4の脱リン酸化剤。
- ヒトPtprz遺伝子を含む、ヒトErbB4の過剰活性化に起因する疾病の予防・治療剤であって、
前記疾病が、小児脳腫瘍、統合失調症、がんから選択される、予防治療剤。 - ヒトPtprzを発現しうる組換えベクターを含む、ヒトErbB4の過剰活性化に起因する疾病の予防・治療剤であって、
前記疾病が、小児脳腫瘍、統合失調症、がんから選択される、予防治療剤。
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