ZBP1のSrc依存型リン酸化によるβ-アクチン翻訳の空間的調節

Stefan Hüttelmaier¹, Daniel Zenklusen, Marcell Lederer

¹Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461, USA. stefan.huettelmaier@medizin.uni-halle.de

Nature

|November 25, 2005

まとめ

郵便番号結合タンパク質1 (ZBP1) は,β-アクチンmRNAの局所化と翻訳を制御する. ZBP1は,mRNAが細胞周辺に到達するまで早期翻訳を防止し,制御された細胞移動を可能にします.

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
発達生物学発達生物学について

背景:

ベータ-アクチンmRNAのアクチンポリメリゼーション部位への局所化は,細胞の移転,分化,がん発生に不可欠です.
オンコフェタルタンパク質ZBP1は,β-アクチンmRNAジップコード要素と結合し,細胞突起への輸送を促進します.

研究の目的:

ZBP1がベータアクチンmRNAの非対称的分類と局所化を達成するメカニズムを解明する.
ベータ-アクチンmRNA翻訳の調節におけるZBP1の役割を調査する.

主な方法:

鶏の細胞におけるZBP1とβ-アクチンmRNAの相互作用を研究した.
ベータアクチンmRNAの翻訳開始と調節に対するZBP1の効果を調査した.
ZBP1媒介の翻訳制御におけるSrcキナーゼの役割を調べました.

主要な成果:

ZBP1は核内のβ-アクチンmRNAと結合し,翻訳開始を阻害する.
翻訳は,ZBP1-RNA複合体が細胞周辺に到着したときにのみ活性化されます.
SrcキナーゼはZBP1をリン酸化し,目的地での翻訳に対する抑制を放出する.

結論:

ZBP1は,β-アクチンmRNA翻訳に対する時的,空間的な制御を提供します.
この調節された翻訳は,細胞移動やニューライトの増殖などのプロセスに不可欠です.
ZBP1を媒介するメカニズムは,真核細胞における遺伝子発現調節の新しい層を突出しています.

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