保存されたグルタミンサイドチェーンの光誘発の反転と,AppA BLUFドメインにおけるその指向
Jeffrey S Grinstead1, Marcela Avila-Perez, Klaas J Hellingwerf
1Department of NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
Journal of the American Chemical Society
|November 23, 2006
まとめ
AppAの青い光の光受容体である.
科学分野:
- バイオケミストリー バイオケミストリー
- フォトケミストリー フォトケミストリー
- 分子生物学は分子生物学である.
背景:
- AppA BLUFドメインは,フラビンを含む青光光受容体である.
- 保存されたグルタミン63は,AppA光サイクルに不可欠です.
- グルタミン63の方向性に関する以前の研究では,矛盾する結果が得られました.
研究 の 目的:
- AppAタンパク質の光サイクルにおけるグルタミン63の方向性を明らかにするために.
- 光に誘発された形状の変化のスペクトル学的証拠を提供するために.
主な方法:
- 核磁共振 (NMR) スペクトロスコピーを用いた.
- データは,既存の紫外線/紫外線吸収度,FTIR,結晶構造データと比較した.
主要な成果:
- NMRスペクトロスコピーは,グルタミン63側鎖の光誘発の反転を確認しました.
- 強い水素結合が,光誘発状態でグルタミン63とチロシン21の間に形成されます.
- 発見は,AppA WT.の以前のスペクトロスコピーおよび構造データと一致しています.
結論:
- グルタミン63側鎖は,AppA BLUF領域で光誘発のフリップを経験する.
- この形状の変化は,タンパク質の光サイクルメカニズムに不可欠である.
- NMRデータは,グルタミン63の方向性に関する不一致を解決する.
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