mCRY1とmCRY2は,日中時計のフィードバックループの負の部分の不可欠な構成要素です
1Laboratory of Developmental Chronobiology, Pediatric Service, Massachusetts General Hospital and Harvard Medical School, Boston 02114, USA.
Cell
|July 31, 1999
まとめ
マウス・クリプトクローム (mCRY) タンパク質であるmCry1とmCry2は,日中時計の重要な構成要素である. これらのタンパク質は,ネガティブなフィードバックループで作用するCLOCK:BMAL1転写複合体を阻害することによって,遺伝子発現を調節する.
科学分野:
- * 分子生物学 * 分子生物学
- *クロノバイオロジー
- * 遺伝学について
背景:
- *日中時計は,日々の生物学的リズムを調節する.
- * コア・クロック・メカニズムには,転写と翻訳のフィードバック・ループが含まれています.
- *これらのループにおける暗号クロームのような特定の時計部品の役割は,明らかにする必要があります.
研究 の 目的:
- * マウスのクリプトクローム遺伝子 (mCry1とmCry2) の昼夜時計における機能を決定する.
- *mCRYタンパク質とmPERタンパク質の相互作用とそのCLOCK:BMAL1転写に対する影響を調査する.
主な方法:
- *クロック/クロック変異マウスのmCry1およびmCry2RNAレベルの分析.
- *mCRY1およびmCRY2タンパク質の細胞局所化研究.
- *共免疫プレシピテーションアッセイで,タンパク質の相互作用を研究する.
- * ルシフェラーゼレポーター遺伝子解析により,転写抑制を評価する.
主要な成果:
- *mCry1およびmCry2RNAレベルは,クロック/クロック変異マウスで低下しています.
- * mCRY1とmCRY2は,mPERタンパク質と相互作用する核タンパク質です.
- * mCRY1とmCRY2は,mPERタンパク質を細胞質から核に転位させます.
- * mCRY1またはmCRY2単独では,CLOCK:BMAL1媒介の転写を阻害する.
- * mPERとmCRYタンパク質は,転写複合体を差異的に抑制する.
結論:
- * マウスの暗号染色体mCry1とmCry2は,日中時計フィードバックループの負の辺で機能する.
- *mCRYタンパク質は,mPERタンパク質の核部位化とCLOCK:BMAL1転写の抑制に不可欠である.
- *mPERとmCRYタンパク質による差異的抑制は,時計内の複雑な規制メカニズムを示唆しています.
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