ガイドラインのNET1とRGMの同時結合は,細胞外NEO1シグナリングをブロックする
Ross A Robinson1, Samuel C Griffiths1, Lieke L van de Haar2
1Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK.
Cell
|March 19, 2021
まとめ
ネオゲニン (NEO1) は,ネトリン-1 (NET1) と反発誘導分子 (RGM) リガンドからの対極信号を統合して三元複合体を形成する. このスーパーアセンブリは 下流の信号を静止し 細胞の成長コーンの崩壊を防ぎ ニューロンの移動を制御します
科学分野:
- 分子生物学
- 神経科学
- 細胞生物学
背景:
- 細胞表面受容体は 移動や分化などの重要な過程で 多様な細胞外信号を統合します
- ネオゲニン (NEO1) は,ネトリン-1 (NET1) による引き寄せと,レプルシブ・ガイダンス分子 (RGM) リガンドによる排斥を媒介する二重の機能を示している.
研究 の 目的:
- NEO1が対極関数を持つリガンドに同時に結合する信号統合のメカニズムを解明する.
- NEO1が 魅力と反感を 調和させる仕組みを 調べるためだ
主な方法:
- NEO1-NET1-RGM複合体の構造を決定するX線結晶学.
- 下流信号の評価のための生化学分析
- 成長コーンの崩壊とニューロンの移動を評価するための細胞ベースのアッセイ.
主要な成果:
- NEO1,NET1,RGMの三元複合体が形成され,細胞膜で"トリマーのトリマー"スーパーアセンブリを形成する.
- このスーパーアセンブリはRGMA- NEO1媒介の成長コーン崩壊とRGMA/ NET1- NEO1媒介のニューロン移動を阻害する.
- シグナリングに適した複合体の形成とNEO1エクトドメインのクラスタリングは,スーパーアセンブリによって防止されます.
結論:
- 単一の受容体への同時リガンド結合は,必ずしも競争的なシグナル伝達をもたらさない.
- 高度な超複合構造は,相反する機能的出力の相互静音化につながる可能性があります.
- このメカニズムは 細胞がどのように 複雑な細胞外信号を 精密な細胞反応に統合するかを 洞察します
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