TbGPR89によるオリゴペプチド信号はトリパノソームクオラムセンシングを駆動する
Federico Rojas1, Eleanor Silvester1, Julie Young1
1Institute for Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3FL, UK.
Cell
|December 4, 2018
まとめ
トリパノソームはクオラムセンシング (QS) を使用して,ストンピーの形成を誘発します. Gタンパク質結合受容体89 (GPR89) は,寄生虫の伝播を可能にするオリゴペプチドである信号を受け取る.
科学分野:
- 寄生虫学
- 分子生物学
- 生物化学
背景:
- トリパノソームはクオラムセンシング (QS) による毒性および伝播を制御する.
- ストンピー誘導因子 (SIF) 信号とトリパノソームにおける受容メカニズムはまだ不明である.
- トリパノソームには正規のGタンパク質結合受容体 (GPCR) 信号伝達経路がない.
研究 の 目的:
- SIF信号とその受容機構をTrypanosoma bruceiで特定する.
- QS媒介のストンピー・フォームの分化に関する分子基礎を解明する.
主な方法:
- トリパノソームにおける新しいGPR89ファミリーのタンパク質の識別と特徴付け.
- バクテリアとトリパノソームにおけるTbGPR89の機能表現.
- TbGPR89の構造モデリングとオリゴペプチドトランスポーター (POT) との比較.
- オリゴペプチドとTbGPR89のストンプ形成における役割を評価するインビトロおよびインビボアッセイ.
主要な成果:
- トライパノソームのGPR89ファミリータンパク質 (TbGPR89) は,ストンプ形成の重要なレギュラーとして特定されました.
- TbGPR89は,オリゴペプチドトランスポーターと構造的に類似しており,オリゴペプチドを輸送する.
- トリパノソームで誘発された寄生虫の分化におけるE. coli POTの発現
- オリゴペプチドはインビトロで茎の形成を促進し,分泌されたオリゴペプチダースはインビボでパラクリン信号を生成した.
結論:
- オリゴペプチドはTrypanosoma bruceiのSIF信号として作用する.
- TbGPR89はオリゴペプチドQS信号の受容体として機能し,ストンプ型の分化を媒介する.
- この発見は,QS信号の受容とトリパノソームの生成に関する新しいメカニズムを明らかにし,寄生虫の毒性と伝播に影響を与えています.
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