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hnRNPA1のテロメアRNAへの構造依存結合

Xiao Liu1, Takumi Ishizuka1, Hong-Liang Bao1

  • 1Division of Chemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki , 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan.

Journal of the American Chemical Society
|May 17, 2017
PubMed
まとめ

研究者は,異質な核リボヌクレオプロテインA1 (hnRNP A1) がテロメア重複を含むRNAに結合する方法を調査した. テロメア機能に影響を与える この相互作用には G四重複のRNA構造が不可欠であることが判明しました

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科学分野:

  • 分子生物学
  • RNA 生物学
  • 生物化学

背景:

  • テロメアリピートを含むRNA (TERRA) は,多様な生物学的役割を持つノンコーディングRNAである.
  • 異質な核リボ核タンパク質A1 (hnRNP A1) は,テロメア維持に関与するRNA結合タンパク質である.
  • hnRNP A1がテロメアRNAに結合する正確なメカニズムは,大部分が特徴づけられていない.

研究 の 目的:

  • テロメアRNAと hnRNP A1のRNA認識モチーフの結合親和性と認識メカニズムを調査する.
  • テロメアRNAとの hnRNP A1 相互作用の構造的要件を解明する.

主な方法:

  • RNA- タンパク質の相互作用を研究するために,光化学的クロスリンクアッセイが使用されました.
  • 小分子探査機は,複合体のインビトロおよび生細胞視覚化に使用された.
  • テロメアRNAG四重複体の構造分析

主要な成果:

  • テロメアRNAのG四重複構造は,そのループを含めて,hnRNP A1結合に不可欠である.
  • 直接視覚化により,テロメアRNA G-クアドルプレックスと hnRNP A1 の間の複合体の形成が確認された.
  • この相互作用は, in vitro と生細胞環境の両方で観察されました.

結論:

  • hnRNP A1は,テロメアRNA G四重複体に構造に依存した結合を示す.
  • この結合相互作用はテロメアの機能を調節する役割を果たします.
  • この研究は,テロメアのタンパク質-RNA G四重複相互作用に関する新しい洞察を提供します.