塩化物と神経伝達物質:ナトリウムシンポーターとの相互作用のメカニズム
Elia Zomot1, Annie Bendahan, Matthias Quick
1Department of Biochemistry, Hebrew University Hadassah Medical School, POB 12272, Jerusalem 91120, Israel.
Nature
|August 21, 2007
まとめ
神経伝達物質:ナトリウムシンポーター (NSS) は,神経伝達物質の輸送のために塩化イオンを使用します. 負の電荷をトランスポーターに導入すると,塩化物模倣になります.
科学分野:
- 神経科学は神経科学である.
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- 神経伝達物質:ナトリウムシンポーター (NSS) は,神経伝達と薬物のターゲットを決定的に有する.
- ユーカリオットのNSSは,バクテリアのNSSとは異なり,神経伝達物質で塩素を輸送する.
- NSS輸送における塩化物の役割と結合部位は不明である.
研究 の 目的:
- NSSによる神経伝達物質の輸送における塩化物の正確な役割を明らかにする.
- NSSトランスポーター内の塩化物結合部位を特定するために.
主な方法:
- 負の電荷を持つアミノ酸をGABAトランスポーターGAT-1 (SLC6A1) に,想定されるナトリウム結合部位で導入する.
- 変異したGAT-1,GAT4 (SLC6A11) およびDAT (SLC6A3) のGABAフルスと交換の評価.
- 比較のために,バクテリアのNSS (LeuT,Tyt1) に相互変異が導入されました.
主要な成果:
- GAT-1,GAT4,DATの変異により,大抵の塩化物依存のトランスポートが生じた.
- 内部pHを下げることで,純流が刺激されるが,変異したGAT-1で交換されるわけではない.
- バクテリアのNSSの相互変異により,塩化物依存症が認められた.
結論:
- 塩化物またはトランスポーターからの負の電荷は,NSSにおける神経伝達物質の結合と転位に不可欠です.
- この負の電荷は,共輸送されたナトリウムイオンの正の電荷を相殺する可能性がある.
- 発見は,NSSのメカニズムと潜在的な薬物開発の洞察を提供します.
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