炭毒素の細胞受容体の識別
K A Bradley1, J Mogridge, M Mourez
1McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, 1400 University Avenue, Madison, Wisconsin 53706, USA.
Nature
|November 9, 2001
まとめ
研究者は,ヒト炭毒素受容体 (ATR) を特定しました. このタンパク質は保護性抗原 (PA) に結合し,毒素の細胞への侵入を媒介し,炭菌治療の潜在的な標的となる.
科学分野:
- 微生物学 微生物学とは
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
背景:
- バチルス・アントラシスは三重の毒素を分泌し,宿主の免疫を回避し,全身の感染症を引き起こします.
- 毒素成分である腫因子 (OF) と致死因子 (LF) は,細胞内基質を改変することによって宿主の防御を損なう.
- 保護性抗原 (PA) は,細胞受容体に結合することによって,哺乳類の細胞への毒素の侵入を容易にします.
研究 の 目的:
- バシルス・アントラシス保護性抗原 (PA) のヒト受容体を特定し,クローン化する.
主な方法:
- 遺伝的補完アプローチを用いたヒトPA受容体のクローニング.
主要な成果:
- 人間のPA受容体,ATR (炭毒素受容体) がクローンされました.
- ATRは,細胞外フォン・ウィレブランド因子Aドメインを特徴とするI型膜タンパク質です.
- このドメインはPAに直接結合し,溶解性のバージョンは毒素の効果を中和することができます.
結論:
- ATRの識別は,炭菌毒素の理解と潜在的中和のための重要な分子標的を提供します.
- ATRのPA結合ドメインは,毒素の侵入に不可欠であり,有望な治療標的を表しています.
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