D2ドーパミン受容体における機能的に重要なアロマティック-アロマティックおよび硫黄-π相互作用
Kristina N-M Daeffler1, Henry A Lester, Dennis A Dougherty
1Division of Chemistry & Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|August 18, 2012
まとめ
ドーパミン受容体内の芳香的残留物は,ヘリックス3,5,6を結ぶマイクロドメインを形成する. この構造は,ドーパミン結合を受容体活性化に変換するのに不可欠です.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 薬理学 薬理学とは
背景:
- D3ドーパミン受容体の結晶構造は,保存されたアロマティック残基のクラスタを明らかにします.
- この領域は結合部位を細胞内螺旋運動と結びつけます.
- このマイクロドメインを理解することは,ドーパミン受容体の機能の鍵です.
研究 の 目的:
- D2ドーパミン受容体におけるアロマティック残留物の機能的役割を調査する.
- 3,5,6のヘリを繋ぐ保存されたマイクロドメイン内の相互作用を調査する.
- ドーパミン受容体の活性化メカニズムを解明する.
主な方法:
- ダブルミュータントサイクル分析.
- 不自然なアミノ酸の変異.
- アロマティックサイドチェーンの漸進的なフッ化.
主要な成果:
- 異なるヘリ (C3.36/W6.48,T3.37/S5.46,F5.47/F6.52) の残留物間で重要な機能的結合が観察されました.
- 化傾向は,重要な静電と芳香と芳香の相互作用を示唆しています.
- C3.36 と W6.48 の間の硫黄-π 相互作用の証拠
結論:
- ヘリックス3,5,6の残留物の密集したマイクロドメインは,ドーパミン結合の障壁として作用する.
- このマイクロドメインは,細胞外ドーパミン結合を細胞内運動に変換する.
- 保存されたマイクロドメインは,受容体活性化中にその形状を維持する可能性が高い.
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