核転位配列を有する成長因子変異体のミトゲン活性回復
1Laboratory of Molecular Biology, Jerome H. Holland Laboratory for the Biomedical Sciences, American Red Cross, Rockville, MD 20855.
まとめ
核転位はヘパリン結合成長因子-1にとって極めて重要です.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- ヘパリン結合成長因子-1 (HBGF-1) は,血管性ポリペプチドのミトゲンである.
- HBGF-1は,アミノ端末切断 (HBGF-1α) 後に生物学的に活性化しています.
研究 の 目的:
- HBGF-1のミトゲン活性における推定核転位配列の役割を調査する.
- HBGF-1誘発の細胞増殖に核の局所化が必要かどうかを判断する.
主な方法:
- ポリメラーゼ連鎖反応変異は,核転位配列が欠けているHBGF-1Uを生成する.
- 変異したHBGF-1タンパク質を生成するプロカリオット発現システム.
- DNA合成,細胞増殖,チロシンリン酸化,およびc-fos発現を測定する.
主要な成果:
- HBGF-1Uはヘパリン結合能力を維持したが,DNA合成と細胞増殖を誘導することはできなかった.
- HBGF-1Uは,細胞内受容体媒介型チロシンリン酸化およびc-fos発現を誘発した.
- 核転位配列を持つキメリックポリペプチド (HBGF-1U2) がミトゲン活性を取り戻した.
結論:
- 核転位は,HBGF-1のミトゲン活性に不可欠です.
- 核転位配列は,細胞増殖におけるHBGF-1の生物学的反応を媒介する.
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