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代替3'-UTRは,膜タンパク質の局所化を調節する支架として作用する
Binyamin D Berkovits1, Christine Mayr1
1Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, New York 10065, USA.
Nature
|April 22, 2015
まとめ
代替ポリアデニレーション (ApA) は,膜タンパク質の局所化と機能を制御する3'未翻訳領域 (3' UTRs) を生成します. このメカニズムは,タンパク質の配列を変えることなく,タンパク質の多様性を拡大し,細胞表面表現に影響を与えます.
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
- 遺伝学 遺伝学とは
背景:
- 代替分裂およびポリアデニレーション (ApA) は,約半数のヒトの遺伝子に影響を与え,異なる3'未翻訳領域 (3'UTR) の長さを持つmRNAトランスクリプトを生成します.
- これらの3'-UTRは,タンパク質配列が変わらなくても,タンパク質の機能と局所化に影響を与えることができます.
研究 の 目的:
- 代替3'-UTRが,膜タンパク質の翻訳後の局所化と機能をどのように調節するかを調査する.
- 3' UTRsがタンパク質の密輸を媒介する分子機構を解明する.
主な方法:
- CD47タンパク質発現と局所化に対する代替3'-UTRの影響を研究するためにヒト細胞系を利用した.
- RNA結合タンパク質HuR (ELAVL1) とSETが3' UTR依存タンパク質転位を媒介する役割を調査した.
- 異なるCD47 3' UTRイソフォームの機能的影響を調査した.
主要な成果:
- CD47の長い3' UTRは細胞表面発現を促進し,短い3' UTRはタンパク質をエンドプラズマ網膜に標的にする.
- 長いCD47 3' UTRによって勧誘されるHuRとSETを含む複合体は,RAC1.1経由でプラズマ膜への翻訳後の転位を促進します.
- CD47の異なる3'-UTRイソフォームは,異なるタンパク質機能につながります.
- 他のHuR結合遺伝子 (CD44,ITGA1,TNFRSF13C) の長い3'UTRも,表面タンパク質発現を高めています.
結論:
- 代替3'-UTRは,RNAの局所化とは独立して,膜タンパク質の局所化と機能の重要な調節体として機能する.
- 3'UTRは,翻訳の際に支架として機能し,新生タンパク質の輸送と機能を指示するためにタンパク質複合体を勧誘する.
- 3' UTRsのApA媒介調節は,タンパク質の機能的多様性を生み出すための広範なメカニズムを表しています.
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