TRPM7チャン酵素は,クロマチンを修飾するキナーゼを放出するために分裂します
Grigory Krapivinsky1, Luba Krapivinsky1, Yunona Manasian1
1Howard Hughes Medical Institute, Department of Cardiology, Boston Children's Hospital, Enders Building 1309, 320 Longwood Avenue, Boston, MA 02115, USA.
Cell
|May 27, 2014
まとめ
TRPM7イオンチャネルのキナーゼドメインが分裂し,核に移動し,ヒストンを改変し,遺伝子発現に影響を与えます. このプロセスは,TRPM7のイオン輸送と表遺伝的変化を結びつける.
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:
- TRPM7 (トランシエント受容体潜在メラスタチン7) は,イオンチャネルとキナーゼ活動の両方を持つ二機能タンパク質です.
- 初期の胚発育と細胞ホメオスタシスにおいて重要な役割を果たします.
- TRPM7のチャネルとキナーゼ機能を遺伝子調節と結びつける正確なメカニズムは完全に理解されていません.
研究 の 目的:
- TRPM7キナーゼドメインの細胞内局所化と機能を調査する.
- エピジェネティック改変による遺伝子発現の調節におけるTRPM7の役割を明らかにする.
- TRPM7媒介のイオンホメオスタシスとクロマチンの改造との関係を調査する.
主な方法:
- 細胞分化とウエスタン・ブロッティングで,割れたTRPM7キナーゼ断片 (M7CKs) を検出する.
- M7CKsを追跡するための免疫光および細胞下局部化研究.
- 染色体免疫降水 (ChIP) 測定は,染色体とヒストンのリン酸化へのM7CK結合を評価するための測定である.
- 細胞内自由亜鉛濃度の測定.
主要な成果:
- TRPM7キナーゼドメインはタンパク質分解的に分裂し,細胞型特異的な方法で核に転位する.
- 核M7CKは,ポリコンブ群のタンパク質を含む染色体再構成複合体と相互作用する.
- M7CKsは,TRPM7-依存遺伝子のプロモーターでヒストン,特にH3Ser10をリン酸化し,遺伝子の活性と相関する.
- TRPM7の活動は,細胞内自由亜鉛レベルを調節し,亜鉛指転写因子に対するM7CK結合に影響を与える.
結論:
- TRPM7は,イオンチャネル活性,細胞内亜鉛ホメオスタシス,および表遺伝的遺伝子調節の間の重要なリンクとして作用します.
- 分裂したTRPM7キナーゼドメインは,ヒストンの改変に直接影響することによって,遺伝子発現を調節する.
- これらの発見は,単一のタンパク質がクロマチンの構造と遺伝子出力を制御するために信号経路を統合する新しいメカニズムを明らかにしています.
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