表面トランスポーター族は,トライパノソームの分化信号を伝達する
Samuel Dean1, Rosa Marchetti, Kiaran Kirk
1Centre for Immunity, Infection and Evolution, Institute for Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK.
Nature
|May 16, 2009
まとめ
アフリカの睡眠病の寄生虫は,環境のシグナルを利用して発症を誘発する. 研究者らは,PADタンパク質を,これらの信号を感知し,区別するために決定的に重要であると特定し,重要な表面マーカーとして機能しました.
科学分野:
- 寄生虫学とは,寄生虫学である.
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
背景:
- 微生物の病原体は,宿主感染とベクトル伝播のために環境のシグナルを利用します.
- アフリカ睡眠病の寄生虫は,ツェッシーハエのライフサイクルの発達のために,シトラートまたはシス-アコニテート (CCA) に反応する.
- CCAに対する寄生虫の過敏性は,低温によって誘発され,ツェセハエの餌食後の状態を模倣します.
研究 の 目的:
- トライパノソームがCCAを分化するために認識する分子機構を特定する.
- 環境信号を感知するカルボキシラートトランスポーターの役割を特徴づける.
- 伝播能力のあるトライパノソームの段階を識別するための表面マーカーを見つけるために.
主な方法:
- PAD (差別化に関連するタンパク質) 家族の識別と特徴付け.
- トライパノソームにおけるPADタンパク質発現と局所化の分析.
- PAD発現を消去し,CCA誘発の微分化を評価するためにRNA干渉 (RNAi).
- コールドショックの条件下でCCAに対する寄生虫の反応を評価する.
主要な成果:
- カーボキシラートトランスポーターファミリー (PAD) は,CCA信号知覚に不可欠であると特定されました.
- PADタンパク質は,伝播能力のある"ぼんやりした形状"のトライパノソームの表面に発現します.
- PADの発現は熱調節され,低温で増加します.
- PAD発現の消去により,CCA誘発の分化が減少し,冷たいショックに対する過敏性が排除されました.
結論:
- PADタンパク質は,トライパノソームのCCA分化信号の分子トランスデューサーとして機能する.
- PADタンパク質は,哺乳類の宿主におけるトライパノソーム伝播段階を区別できる最初の表面マーカーである.
- この発見は,寄生虫の発達と潜在的な治療標的についての洞察を提供します.
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