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ZTLによるTOC1の標的化された分解は,アラビドプシス・タリアナ (Arabidopsis thaliana) の昼夜機能を調節する

Paloma Más¹, Woe-Yeon Kim, David E Somers

¹Department of Cell Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

|December 5, 2003

まとめ

ZEITLUPE (ZTL) は,アラビドプシスの分解を対象に,CAB EXPRESSION 1 (TOC1) のタイミングをターゲットにして,植物の昼間時計を調節しています. このタンパク質の分解は,日中リズムの安定性と月経の長さを維持するために不可欠です.

科学分野:

植物生物学植物生物学
分子遺伝学分子遺伝学
クロノバイオロジークロノバイオロジー

背景:

シルカディアンリズムは,負の転写フィードバックループに基づく細胞振動器によって調節されます.
植物の昼間時計のメカニズムは,主に転写の調節を通して理解されています.
タンパク質の安定性や局所化は,日中時計の機能にも役割を果たします.

研究の目的:

植物の昼間時計の調節におけるZEITLUPE (ZTL) の役割を調査する.
CAB EXPRESSION 1 (TOC1) のタンパク質レベルを制御するZTLの機能に関する遺伝的および分子的証拠を提供すること.

主な方法:

アラビドプシス・タリアナ変異体 (ztl-1) を用いた遺伝子解析.
タンパク質とタンパク質の相互作用 (TOC1-ZTL) を研究するための分子測定法.
プロテアソーム抑制を含むタンパク質分解経路の調査.

主要な成果:

ZEITLUPE (ZTL) は,CAB EXPRESSION 1 (TOC1) のタイミングと直接相互作用しています.
ztl-1変異はTOC1-ZTLの相互作用を妨害し,構成TOC1タンパク質の発現につながります.
TOC1の暗闇依存性分解は,機能的なZTLを必要とし,プロテアソーム媒介である.

結論:

ZTLは,TOC1タンパク質の標的分解を媒介し,植物の日常時計の調節における重要なステップです.
TOC1-ZTLの相互作用は,TOC1タンパク質の安定性を制御するために不可欠です.
このメカニズムは,アラビドプシスの昼夜周期の長さの調節に寄与する.

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