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頂点的決定因子aPKCとdPatjは,ドロソフィラの眼におけるFrizzled依存平面細胞の極性を調節する
Alexandre Djiane1, Shaul Yogev1, Marek Mlodzik1
1Brookdale Department of Molecular, Cell and Developmental Biology, Mount Sinai School of Medicine, New York, New York 10029.
Cell
|May 24, 2005
まとめ
この研究では,アピカル・ベース・ポラリティのタンパク質が,ドロソフィラの目における平面細胞のポラリティ (PCP) をどのように調節するかを明らかにした. dPatj/aPKC複合体は,PCPの確立を制御するためにFrizzled (Fz1) を阻害する.
科学分野:
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学について
- 遺伝学 遺伝学とは
背景:
- 平面細胞の極性 (PCP) は上皮組織にとって極めて重要であり,細胞を頂上基底 (A/B) 軸に垂直に方向づけます.
- A/Bの極性決定因子とPCPのシグナル伝達との関係は,まだ完全に理解されていません.
- Frizzled (Fz1) のようなPCPタンパク質のアピカル局所化は,その機能に不可欠である.
研究 の 目的:
- A/Bの極性決定因子とFz1媒介のPCPの確立の間の分子関連を解明する.
- ドロソフィラの目におけるPCPの調節におけるdPatjとaPKCの役割を調査する.
主な方法:
- Fz1.1の結合パートナーを特定するための分子相互作用の研究.
- ドロソフィラの目変異体におけるPCP欠陥の分析.
- タンパク質の局所化およびリン酸化イベントの調査.
主要な成果:
- dPatjはFrizzled (Fz1) の細胞質尾に直接結合する.
- dPatjに関連した非典型タンパク質キナーゼC (aPKC) 複合体は,Fz1.0を酸化し,抑制する.
- dPatjまたはaPKCのコンポーネントの障害は,ドロソフィラの目におけるPCPの欠陥につながる.
- aPKCとdPatjは下調調節され,PCPシグナル伝達中にBazookaは上調調節され,対抗性を示す.
結論:
- dPatj/aPKC複合体経由で,A/B極性とPCPの確立の間に直接的な分子リンクが存在する.
- dPatj/aPKC複合体は,Fz1の阻害剤として作用し,特定の細胞環境におけるその活動を調節する.
- このメカニズムは,不要な Fz1 活動を防止することによって,PCP の適切な確立を保証します.
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